ULC UL142 Comparison Spreadsheet

Uniform Specification Series Horizontal Tanks Single Wall TanksULC-S601/UL-142 Aboveground Horizontal Storage Tanks

ULCNominal Capacity Nominal I.D. Nominal Len. Thickness Min. t

1500 1000 1910 2.0 1.802500 1300 1900 2.5 2.305000 1300 3800 2.5 2.30

10000 2000 3190 4.0 3.8015000 2500 3060 5.0 4.7025000 2500 5100 5.0 4.7035000 2500 7140 5.0 4.7050000 2500 10200 5.0 4.7050000 3000 7080 6.0 5.6275000 3600 7370 7.5 7.12

100000 3600 9830 7.5 7.12125000 3600 12290 7.5 7.12

US units ULC UL-142Nominal Capacity Nominal I.D. Nominal Len. Thickness Min. t Min. t Head Bracing

397 39.3701 75.1969 0.0787 0.0709 0.0930661 51.1811 74.8031 0.0984 0.0906 0.1230

1322 51.1811 149.6063 0.0984 0.0906 0.16702643 78.7402 125.5906 0.1575 0.1496 0.2400 Yes3965 98.4252 120.4724 0.1969 0.1850 0.2400 Yes6609 98.4252 200.7874 0.1969 0.1850 0.2400 Yes9252 98.4252 281.1024 0.1969 0.1850 0.2400 Yes

13217 98.4252 401.5748 0.1969 0.1850 0.2400 Yes13217 118.1102 278.7402 0.2362 0.2213 0.2400 Yes19826 141.7323 290.1575 0.2953 0.2803 0.2400 Yes26434 141.7323 387.0079 0.2953 0.2803 0.2400 Yes33043 141.7323 483.8583 0.2953 0.2803 0.2400 Yes

Heads for tank diameters exceeding 72 inches must be 5/16" thick or be braced for UL-142

Non-Uniform Specification Series Horizontal Tanks Single WallULC-S601/UL-142 Aboveground Horizontal Storage Tanks

ULCCapacity Range Diamter Max. Length Thickness Min. t

790 3145 1000 4000 2.0 1.801530 6140 1250 5000 2.5 2.301730 6905 1300 5200 2.5 2.302650 10605 1500 6000 3.0 2.804200 16840 1750 7000 3.5 3.306280 25135 2000 8000 4.0 3.808950 35785 2250 9000 4.5 4.20

12270 49090 2500 10000 5.0 4.7021210 84830 3000 12000 6.0 5.6228220 112900 3300 13200 7.0 6.6233670 134700 3500 14000 7.0 6.6236640 146580 3600 14400 7.5 7.1250270 200000 4000 16000 8.0 7.60

US units ULC UL-142Capacity Range Diamter Max. Length Thickness Min. t Min. t Head Bracing

209 831 39.3701 157.4803 0.0787 0.0709 0.0930404 1623 49.2126 196.8504 0.0984 0.0906 0.1230457 1825 51.1811 204.7244 0.0984 0.0906 0.1230701 2803 59.0551 236.2205 0.1181 0.1102 0.1230

1110 4451 68.8976 275.5906 0.1378 0.1299 0.16701660 6644 78.7402 314.9606 0.1575 0.1496 0.2400 Yes2366 9459 88.5827 354.3307 0.1772 0.1654 0.2400 Yes3243 12976 98.4252 393.7008 0.1969 0.1850 0.2400 Yes5607 22424 118.1102 472.4409 0.2362 0.2213 0.2400 Yes7460 29844 129.9213 519.6850 0.2756 0.2606 0.2400 Yes8900 35607 137.7953 551.1811 0.2756 0.2606 0.2400 Yes9685 38747 141.7323 566.9291 0.2953 0.2803 0.2400 Yes

13288 52868 157.4803 629.9213 0.3150 0.2992 0.3650

Maximum capacity for UL-142 is 50000 gallon and 52868 gallon for ULCMaximum diameter for UL-142 is 144 inches and 157.48 inches for ULCMaximum length for UL-142 is 6 x diameter and 4 x diameter for ULCHeads for tank diameters exceeding 72 inches must be 5/16" thick or be braced for UL-142

Comparison of Some Standard Sizes used in USULC-S601/UL-142 Aboveground Horizontal Storage Tanks

Secondary (tight wrap)Diameter Length Capacity Min. t Head Bracing Min. t (ULC) Min. t Min. t (ULC)

36 48 211 0.0930 0.0709 0.0930 0.090648 72 564 0.0930 0.0906 0.0930 0.090664 72 1003 0.1230 0.1299 0.0930 0.110264 144 2005 0.1670 0.1299 0.1230 0.110264 216 3008 0.1670 0.1299 0.1230 0.110264 288 4011 0.1670 NA 0.1230 NA84 168 4030 0.2400 Yes 0.1654 0.1670 0.110296 192 6016 0.2400 Yes 0.1850 0.1670 0.110296 256 8021 0.2400 Yes 0.1850 0.1670 0.110296 320 10026 0.2400 Yes 0.1850 0.1670 0.110296 384 12032 0.2400 Yes 0.1850 0.1670 0.1102

108 256 10152 0.2400 Yes 0.2047 0.1670 0.1102108 300 11896 0.2400 Yes 0.2047 0.1670 0.1102120 306 14981 0.2400 Yes 0.2409 0.1670 0.1496120 408 19974 0.2400 Yes 0.2409 0.1670 0.1496132 252 14928 0.2400 Yes 0.2606 0.1670 0.1496132 336 19904 0.2400 Yes 0.2606 0.1670 0.1496132 420 24880 0.2400 Yes 0.2606 0.1670 0.1496132 510 30211 0.2400 Yes 0.2606 0.1670 0.1496144 720 50758 0.3650 NA 0.2400 NA

ULC SecondaryDia. SI Allowed? Nom. ThickMin. Thick Min. Inches Min. t (mm) Min. t (in)

914 Yes 1.83 1.80 0.0709 2.30 0.09061219 Yes 2.44 2.30 0.0906 2.30 0.09061626 Yes 3.25 3.30 0.1299 2.80 0.11021626 Yes 3.25 3.30 0.1299 2.80 0.11021626 Yes 3.25 3.30 0.1299 2.80 0.11021626 No 3.25 3.30 0.1299 2.80 0.11022134 Yes 4.27 4.20 0.1654 2.80 0.11022438 Yes 4.88 4.70 0.1850 2.80 0.11022438 Yes 4.88 4.70 0.1850 2.80 0.11022438 Yes 4.88 4.70 0.1850 2.80 0.11022438 Yes 4.88 4.70 0.1850 2.80 0.11022743 Yes 5.49 5.20 0.2047 2.80 0.11022743 Yes 5.49 5.20 0.2047 2.80 0.11023048 Yes 6.10 6.12 0.2409 3.80 0.14963048 Yes 6.10 6.12 0.2409 3.80 0.14963353 Yes 6.71 6.62 0.2606 3.80 0.14963353 Yes 6.71 6.62 0.2606 3.80 0.14963353 Yes 6.71 6.62 0.2606 3.80 0.14963353 Yes 6.71 6.62 0.2606 3.80 0.14963658 No 7.32 7.12 0.2803 3.80 0.1496

Maximum capacity for UL-142 is 50000 gallon and 52868 gallon for ULCMaximum diameter for UL-142 is 144 inches and 157.48 inches for ULCMaximum length for UL-142 is 6 x diameter and 4 x diameter for ULCHeads for tank diameters exceeding 72 inches must be 5/16" thick or be braced for UL-142

Uniform Specification Series Vertical TanksULC-S630/UL-142 Aboveground Vertical Storage Tanks

ULC Nominal Thickness Minimum Thickness Secondary ShellNominal Capacity Diameter Height Shell t Bottom t Roof t Shell t Bottom t Roof t Nom. t Min. t

15000 2500 3060 5.00 6.00 4.00 4.75 5.75 3.80 3.00 2.8025000 2500 5100 5.00 6.00 4.00 4.75 5.75 3.80 3.00 2.8050000 3500 5200 6.00 8.00 4.50 5.75 7.75 4.30 4.50 4.3060000 3500 6250 6.00 8.00 4.50 5.75 7.75 4.30 4.50 4.3070000 3500 7300 6.00 8.00 4.50 5.75 7.75 4.30 4.50 4.3090000 3500 9400 6.00 8.00 4.50 5.75 7.75 4.30 4.50 4.30

125000 4000 10000 7.00 8.00 5.00 6.75 7.75 4.75 4.50 4.30150000 4000 12000 7.00 8.00 5.00 6.75 7.75 4.75 4.50 4.30175000 4000 14000 7.00 8.00 5.00 6.75 7.75 4.75 4.50 4.30

Note: Nominal thickness versus minimum thickness is not the same for vertical and horizontal tanks (6 mm nominal in horizontal has 5.62 minimum while in vertical it would be 5.75)

UL-142 Minimum Thickness Minimum Thickness (ULC) (in) Secondary Shell (in)Nominal Capacity Diameter Height Shell t Bottom t Roof t Shell t Bottom t Roof t UL-142 ULC

3965 98.4252 120.4724 0.1670 0.2400 0.1230 0.1870 0.2264 0.1496 0.1230 0.11026609 98.4252 200.7874 0.1670 0.2400 0.1230 0.1870 0.2264 0.1496 0.1230 0.1102

13217 137.7953 204.7244 0.1670 0.2400 0.1230 0.2264 0.3051 0.1693 0.1230 0.169315860 137.7953 246.0630 0.1670 0.2400 0.1230 0.2264 0.3051 0.1693 0.1230 0.169318504 137.7953 287.4016 0.1670 0.2400 0.1230 0.2264 0.3051 0.1693 0.1230 0.169323791 137.7953 370.0787 .167/.240 0.2400 0.1230 0.2264 0.3051 0.1693 .123/.167 0.169333043 157.4803 393.7008 .167/.240 0.2400 0.1230 0.2657 0.3051 0.1870 .123/.167 0.169339651 157.4803 472.4409 NA NA NA 0.2657 0.3051 0.1870 NA 0.169346260 157.4803 551.1811 NA NA NA 0.2657 0.3051 0.1870 NA 0.1693

All parts of shells more than 25' below top edge must be 0.240" for primary and 0.167" for secondary for UL-142Maximum tank height is 35' for UL-142

Non-Uniform Specification Series Vertical TanksULC-S630/UL-142 Aboveground Vertical Storage Tanks

ULC Nominal Thickness Minimum Thickness Secondary ShellMax. Capacity Max. Dia. Shell t Bottom t Roof t Shell t Bottom t Roof t Nom. t Min. t

4000 1500 2.50 3.00 2.50 2.30 2.80 2.30 2.50 2.3010500 1500 2.50 3.00 2.50 2.30 2.80 2.30 2.50 2.3030000 2100 4.00 4.50 3.00 3.80 4.30 2.80 3.00 2.8050000 2500 5.00 6.00 4.00 4.75 5.75 3.80 3.00 2.80

135000 3500 6.00 8.00 4.50 5.75 7.75 4.30 4.50 4.30175000 4000 7.00 8.00 5.00 6.75 7.75 4.75 4.50 4.30

Note: Nominal thickness versus minimum thickness is not the same for vertical and horizontal tanks (6 mm nominal in horizontal has 5.62 minimum while in vertical it would be 5.75)

UL-142 Minimum Thickness Minimum Thickness (ULC) (in) Secondary Shell (in)Max. Capacity Max. Dia. Shell t Bottom t Roof t Shell t Bottom t Roof t UL-142 ULC

1057 59.0551 0.0930 0.0930 0.0930 0.0906 0.1102 0.0906 0.0930 0.09062776 59.0551 0.1670 0.2400 0.1230 0.0906 0.1102 0.0906 0.1230 0.09067930 82.6772 0.1670 0.2400 0.1230 0.1496 0.1693 0.1102 0.1230 0.1102

13217 98.4252 0.1670 0.2400 0.1230 0.1870 0.2264 0.1496 0.1230 0.110235686 137.7953 0.1670 0.2400 0.1230 0.2264 0.3051 0.1693 0.1230 0.169346260 157.4803 0.1670 0.2400 0.1230 0.2657 0.3051 0.1870 0.1230 0.1693

All parts of shells more than 25' below top edge must be 0.240" for primary and 0.167" for secondary for UL-142Maximum tank height is 35' for UL-142Maximum Diameter is 4000mm for ULCMaximum height is 4 x diameter for both UL-142 and ULCMaximum capacity for UL-142 is 50000 gallon and 46260 for ULC

Rectangular Steel Aboveground TanksULC/ORD-C142.18/UL-142 Aboveground Rectangular Storage Tanks

ULC UL-142Capacity (L) Shell Min t (inches)<= 2500 2.36 0.0929 UL-142 specifies material no thinner than 0.093" thick2500 to 5000 3.42 0.1346 to be used for all tanks. However, they must pass the> 5000 6.00 0.2362 performance test specified in section 18 which is a

pressure test and a top load test.ULC specifies that the bottoms bethe same thickness as the shell ifthe tanks are elevated off the groundby at least 150 mm (6") and 6 mmthick otherwise.

Notes on Rectangular Tank comparison of ULC/ORD-C142.18 and UL-142

Item UL-142 ULC-S601

Maximum Capacity 50000 gallons 100000 L (26400 gallons)Actual Tank Capacity

Pressure Range -0.5 psig to 1.0 psig -300 Pa (-0.04 psig) to 7 kPa (1.01 psig)Material Grades

Compartment Bulkheads Must be double bulkheads.

Bulkhead Thickness Not less than 0.093".

Lifting Lugs Not specified.

Maximum Fitting Size Not specified. Not specified.Minimum Fitting Spacing Not specified. Not specified.

No limitations.

Not allowed.

Must be in intimate contact.

Manways

Cannot exceed nominal rated capacity by more than 10%

Cannot exceed nominal rated capacity by more than 2.5%

A36, A569, A635, A167, A240, or a carbon content of 0.3% or less and mechanical strength equal to one of the other steels listed

A283-C, A569, A635, CSA G40.21M 230 G, 304 SS, 316 SS, or any welding quality carbon or low alloy steelwith a minimum yield strength of 200 mPa (29000 psi)

Stainless Steel Thickness

Gives allowable thicknesses which are thinner than carbon steel.

Makes no distinction between carbon steel and stainless steel thicknesses.

If made of one piece construction, can be single bulkhead. More than one piece construction must be double bulkheads.

Thickness is based on the compartment capacity.

Required. Design per Figure 8 and Section 3.10.

Couplings and Tank Flanges

Maximum of 6" pipe size above liquid level. Maximum of 3" pipe size below liquid level.

Flanged Fittings Above Liquid Level

Standard weight pipe. Reinforcing pads are not required.

Fittings under 4" pipe size shall have standard weight pipe. Fittings 4" to 10" pipe size shall have Ex-Hvy pipe or shall have standard weight pipe with reinforcing pads. Fittings over 10" shall have standard weight pipe with reinforcing pads.

Flanged Fittings Below Liquid Level


Fittings under 4" pipe size shall have a wall thickness at least equal to the tank wall thickness. Fittings 4" and greater shall be minimum standard weight pipe with reinforcing pads.

Threaded pipe nipples or pipe for butt welding


Secondary containment shells

Can be in intimate contact or can be an essentially open (unsealed but precipitation resistant) steel shell having a capacity of not less than 110% of the primary tank.

None required in the draft of the new version.

Each compartment of a compartment tank requires either a manway or an access opening.



Tested at 35 kPa (5 psig).

Vacuum test

Monitoring Device Not required.

Shipping with vacuum Not required.

Other devices None.

Painting One prime coat required. Not required.

Air testing of primary and secondary tanks

Tested at 3 psig minimum and 5 psig maximum.

Vacuum test interstice at 13" mercury for a minimum of 12 hours. Vacuum not to vary more than +/- 2" mercury. This test can be done in place of the pressure test on the secondary tank.

Vacuum test interstice at minimum of 81 kPa (24" mercury) for 5 hours with the vacuum dropping no lower than 67.5 kPa (20" mercury). After this test the interstice with a minimum of 51 kPa (15" mercury) for 5 days with a drop in vacuum not to exceed 9 kPa (2.65" mercury). This is in addition to the pressure test.

Vacuum monitoring devices are required on double wall tanks. They must be tested for 5 days prior to placing on the tank and must be in place for the 5 day tank test.

All double wall tanks must ship with a minimum of 51 kPa (15" mercury) vacuum on the interstice.

A gauge chart and gauge stick shall be supplied with the tank. Tanks with dished heads require special gauge charts be supplied. Tanks equipped with a manual fill pipe connection at the top of the tank must ship with spill containment devices. All tanks are to shipped with an overfill protection device.


1) ULC has a maximum tank capacity of 100000 L (26400 gallons). UL-142 does not specify.2)

3) ULC requires lifting lugs and specifies the design in Figure 8 and section 3.10.4) ULC specifies all steel shall have a minimum yield strength of 200MPa (29000 psi).5)

6) ULC specifies that comparment tanks shall have double bulkheads.7)

8)

9)

10)

11) ULC limits the size of threaded connections located below liquid level to a maximum of 3" pipe size.12)

13)

14)

15)

16)

17) UL-142 requires a prime coat of paint. ULC does not.

ULC allows primary tanks to be enclosed in sealed secondary containment shells with intimate contact or in essentially open (unsealed but precipitation resistant) steel shells having a capacity of not less than 110% of the primary tank.

ULC specifies that the thickness of compartments tanks shall be based on the capacity of the compartments.

UL-142 specifies that primary and secondary tanks be air tested at 3 psig (21 kPa) minimum and 5 psig (35 kPa) maximum. ULC specifies the test shall be 35 kPa (5 psig).

UL-142 has an option to vacuum test the interstice at 13 inches of mercury for a minimum of 12 hours with vacuum maintained at plus or minus 2 inches of mercury. This can be done instead of the pressure test. ULC specifies that after the pressure test is completed, the interstice shall be tested at 81 kPa (24 inches of mercury) for 5 hours with the vacuum dropping no lower than 67.5 kPa (20 inches of mercury). After this test the tank shall be tested with a minimum vacuum of 51 kPa (15 inches of mercury) held for a period of 5 consecutive days with a drop of vacuum not to exceed 9 kPa (2.65 inches of mercury).

ULC requires vacuum monitoring devices on double wall tanks be factory installed. Prior to installing the monitoring device to the tank, it shall be assembled and pass the 5 day test specified above. It shall then be attached to the tank for the tank 5 day test and can be used to measure the interstice performance.

ULC requires a spill containment device and an overfill protection device be supplied with all tanks equipped with a manual fill pipe connection at the top of the tank.

ULC requires flanged fittings above the liquid level to have pipe wall thickness equal to Ex-Hvy pipe in sizes from 4" to 10". To use standard weight pipe or for sizes greater than 10" reinforcing pads are required. UL-142 only requires standard weight pipe and does not require reinforcing pads.

ULC requires all flanged fittings below liquid level in sizes 4" and greater to be a minimum of standard weight pipe with reinforcing pads. Fittings less than 4" pipe size do not require reinforcing pads. However, their wall thickness shall be equal to or greater than the tank wall thickness. UL-142 only requires standard weight pipe and does not require reinforcing pads.

It appears that ULC only allows threaded couplings and 150# flanged fittings. Externally threaded pipe and butt welded pipe connections do not appear to be allowed.

ULC requires a manway be installed in each compartment of a compartment tank or an access opening be cut in each compartment and a cover plate welded in place. UL-142 requires a manway in all tanks exceeding 5000 gallon capacity.(UL-142 requirement is deleted in new draft.)

UL-142 defines an atmospheric tank as one that has been designed to operate at pressures from atmospheric through 0.5 psig (3.4 kPa). ULC defines non-pressure tanks as one that is normally vented to the atmosphere and is not intended to accommodate internal pressures at the top greater than 7 kPa (1.01 psig) nor internal vacuum greater than 300 Pa (0.09 inches of mercury). (UL-142 definition is changed in the new draft.)

Notes on Horizontal Tank comparison of ULC-S601 and UL-142


Maximum Diameter 144" 4000 mm (157.48")Maximum Length 6 times diameter 4 times diameterMaximum Capacity 50000 gallons 200000 L (52868 gallons)Actual Tank Capacity

Pressure Range -0.5 psig to 1.0 psig -300 Pa (-0.04 psig) to 7 kPa (1.01 psig)Material Grades

Head Construction Maximum of 3 pieces.

Flat Flanged Heads

Flat Unflanged Heads

Compartment Bulkheads Must be double bulkheads.

Bulkhead Thickness Thickness is based on the tank diameter.

Tank Supports


Maximum Fitting Size Not specified. 1/2 the tank radius.








Maximum of 3 pieces for diameters 48" to 96". Maximum of 4 pieces for diameters 97" to 144".

Flange depth is to be 5 times the head thickness but not less than 1/2". Inside knuckle radius at least equal to 1.5 times the head thickness.

Flange depth is to be 6 times the head thickness and not less than 25 mm (1") for tanks over 1300 mm (51") in diameter and not less than 10 mm (0.394") for tanks 1300 mm and less in diameter. Inside knuckle radius at least equal to 2 times head thickness.

May only be used for bulkheads made of one piece construction and bracing. Bracing is attached horizontally. May not be used for primary or secondary heads.

May be used for primary heads with bracing and for secondary heads. Bracing is attached vertically. May not be used for bulkheads.

If made of one piece construction, can be single bulkhead and be either flat flanged or flat unflanged with bracing. More than one piece construction must be double bulkheads.

Not less than 0.167" for diameters 76" and less and 1/4" for diameters over 76".

Maximum height of 12" unless protected with fire resistent material. Can be constructed in accordance with Figure 31.1 and Table 31.1. If so, tanks over 50' long must have 3 saddles. May provide other support construction details by conducting structrual analysis.

Must be designed in accordance with sound engineering practice. Some guidelines are given in Appendix E. Tanks 5000 L (1300 gallons) and less may have stabilizing brackets to prevent rolling.

Required. Design per Figure 2 and located per Figure 3.



Minimum Fitting Spacing Not specified.

No limitations.

Not allowed.

Not allowed.

Manways

Vacuum test

Minimum distance between the center of two fittings shall not be less than the sum of their diameters.





Fittings under 4" pipe size shall have standard weight pipe. Fittings 4" to 10" pipe size shall have Ex-Hvy pipe or shall have standard weight pipe with reinforcing pads. Fittings over 10" shall have standard weight pipe with reinforcing pads.



Fittings under 4" pipe size shall have a wall thickness at least equal to the tank wall thickness. Fittings 4" and greater shall be minimum standard weight pipe with reinforcing pads.



Secondary containment shells not in intimate contact with primary tank

Allows for shells if standoffs are used. Allows for heads if the secondary heads meet the same requirements as the primary heads. Shells with intimate contact may extend past the end of the primary tank up to 12". (If over 12" the thickness must meet requirement of the primary tank.)


Each compartment of a compartment tank requires either a manway or an access opening.


Tested at 3 psig minimum and 5 psig maximum.

Tested at 30 kPa (4.5 psig) minimum and 35 kPa (5 psig) maximum for tanks 1750 mm (69") diameter and less.

Tested at 20 kPa (2.9 psig) minimum and 30 kPa (4.5 psig) maximum for tanks 1750 mm (69") to 3000 mm (118") diameter.

Tested at 10 kPa (1.5 psig) minimum and 20 kPa (2.9 psig) maximum for tanks 3000 mm (118") to 4000 mm (157.48") diameter.


Vacuum test interstice at minimum of 51 kPa (15" mercury) for 5 days with a drop in vacuum not to exceed 9 kPa (2.65" mercury). This is in addition to the pressure test.





Other devices None.

Painting One prime coat required. Not required.



A gauge chart and gauge stick shall be supplied with the tank. Tanks with dished heads require special gauge charts be supplied. Tanks equipped with a manual fill pipe connection at the top of the tank must ship with spill containment devices.


1) Maximum Diameter is 4000mm (157.48") for ULC. UL-142 has a maximum of 144".2) Maximum length is 4 x diameter for ULC and 6 x diameter for UL-142.3) Maximum capacity for UL-142 is 50000 gallon and 52868 gallon (200000 L) for ULC.4)

5)

6)

7) ULC specifies all steel shall have a minimum yield strength of 200MPa (29000 psi).8)

9) ULC specifies the maximum size of any connection shall not be greater than 1/2 the tank radius.10)

11)

12)

13)

14) ULC requires all double wall tanks be shipped with a minimum vacuum of 51 kPa (15 inches of mercury).

15)

16)

17)

18)

19)

20) ULC limits the size of threaded connections located below liquid level to a maximum of 3" pipe size.

Per UL-142 flat flanged heads greater than 72 inch diameter shall be either 5/16" thick or shall be braced.

Per UL-142 the actual tank capacity can exceed the nominal rated capacity by 10%. Per ULC the actual capacity can exceed the nominal rated capacity by only 2.5%.

ULC requires lifting lugs and specifies the design in Figure 2. Figure 3 specifies the location of the lifting lugs.

ULC specifies the minimum distance between the center of two fittings shall not be less than the sum of their diameters.

ULC specifies that tank supports shall be designed in conformance with sound engineering practice. It then gives some guidelines in Appendix E. Tanks 5000 L (1300 gallons) may have stabilizing brackets to prevent rolling.

UL-142 specifies that primary and secondary tanks be air tested at 3 psig (21 kPa) minimum and 5 psig (35 kPa) maximum. ULC specifies the minimum shall be 30 kPa (4-1/2 psig) and a maximum of 35 kPa (5 psig) for tanks 1750 mm (69") in diameter and less. For tanks from 1750 mm to 3000 mm (118") in diameter the minimum is 20 kPa (2.9 psig) and maximum of 30 kPa. From 3000 mm to 4000 mm (157.48") in diameter the minimum is 10 kPa (1-1/2 psig) and maximum of 20 kPa.

UL-142 has an option to vacuum test the interstice at 13 inches of mercury for a minimum of 12 hours with vacuum maintained at plus or minus 2 inches of mercury. This can be done instead of the pressure test. ULC specifies that after the pressure test is completed, the interstice shall be tested with a minimum vacuum of 51 kPa (15 inches of mercury) held for a period of 5 consecutive days with a drop of vacuum not to exceed 9 kPa (2.65 inches of mercury). (This is different than the vertical tanks.)


ULC requires a spill containment device be supplied with all tanks equipped with a manual fill pipe connection at the top of the tank.

ULC requires all compartment tanks be made using double bulkheads only. UL-142 allows single bulkheads if they are of one piece construction.

ULC requires a manway be installed in each compartment of a compartment tank or an access opening be cut in each compartment and a cover plate welded in place per Appendix C. UL-142 requires a manway in every tank or compartment that exceeds 5000 gallons. (This requirement is removed in the new draft.)

ULC specifies that heads cannot be fabricated from more than 3 pieces. UL-142 allows 4 pieces on heads 97 inches to 144 inches in diameter.

UL-142 specifies the flange depth on flat flanged heads to be 5 times the head thickness, but not less than 1/2". ULC specifies it as being 6 times the head thickness, but not less than 25 mm (1 inch). For tanks up to 1300 mm (51 inches) diameter the straight flange is 6 times the head thickness but not less than 10 mm (0.394 inches).


21)

22)

23)

24) UL-142 allows thinner material to be used if it is stainless steel. ULC does not.25)

26)

27)

28)

29)

30)

31)

32) ULC allows flat unflanged heads for use as secondary heads. UL-142 does not.33) UL-142 requires a prime coat of paint. ULC does not.

ULC requires flanged fittings above the liquid level to have pipe wall thickness equal to Ex-Hvy pipe in sizes from 4" to 10". To use standard weight pipe or for sizes greater than 10" reinforcing pads are required. UL-142 only requires standard weight pipe and does not require reinforcing pads.

ULC requires all flanged fittings below liquid level in sizes 4" and greater to be a minimum of standard weight pipe with reinforcing pads. Fittings less than 4" pipe size do not require reinforcing pads. However, their wall thickness shall be equal to or greater than the tank wall thickness. UL-142 only requires standard weight pipe and does not require reinforcing pads.


UL-142 defines an atmospheric tank as one that has been designed to operate at pressures from -0.5 psig (3.4 kPa) through 1.0 psig (6.8 kPa). ULC defines non-pressure tanks as one that is normally vented to the atmosphere and is not intended to accommodate internal pressures at the top greater than 7 kPa (1.01 psig) nor internal vacuum greater than 300 Pa (0.04 psig).

ULC allows flat unflanged heads with bracing to be used for heads but not bulkheads. UL-142 allows flat unflanged heads with bracing to be used for bulkheads but not for heads.

Bulkhead thicknesses per ULC is based on the tank diameter. Per UL-142 bulkheads shall not be less than 0.167" thick for diameters 76" and less and shall be 1/4" for diameters over 76".

ULC bracing for flat unflanged heads are attached vertically. UL-142 bracing for unflanged bulkheads are attached horizontally.

ULC specifies that the tank manufacturer must supply a special capacity chart if the tank is not built with flat heads.

The secondary tank per UL-142 does not have to be in intimate contact with the primary tank as long as standoffs per Figure 21.1 are used. ULC requires intimate contact of the primary and secondary tank.

UL-142 allows the shell of the secondary tank to extend past the primary tank. The secondary heads must then meet the same requirements as the primary heads. If the shell extends more than 12" past the primary tank, the secondary shell thickness must meet the same requirements as the primary shell. ULC does not allow this type of secondary shell extension.

Notes on Vertical Tank comparison of ULC-630 and UL-142


Maximum Diameter None 4000 mm (157.48")Maximum Height 4 times diameter with a maximum of 35' 4 times diameterMaximum Capacity 50000 gallons 175000 L (46260 gallons)Actual Tank Capacity

Pressure Range -0.5 psig to 1.0 psig

Material Grades

Head Construction Maximum of 4 pieces.

Flat Flanged Heads

Cone Roof Heights Tank diameter/10.

No additional requirements.

Tank Supports Not specified.


Maximum Fitting Size Not specified. 1/2 the tank radius.Minimum Fitting Spacing Not specified.

No limitations.



Appendix A gives the maximum wind velocity and seismic zones for unanchored tanks. It also give maximum snow loads for roofs and maximum internal pressures. Maximum internal pressure ranges from 1 kPa (0.145 psig) to 9.4 kPa (1.36 psig). All are dependent upon tank diameter and height.






Maximum of 3 pieces for diameters 48" to 96". Maximum of 4 pieces for diameters 97" to 144".

Flange depth is to be 5 times the head thickness but not less than 1/2". Inside knuckle radius at least equal to 1.5 times the head thickness.

Flange depth is to be 6 times the head thickness and not less than 25 mm (1"). Inside knuckle radius at least equal to 2 times the head thickness.

Tank Radius/6 for roofs less than 0.167" thick. Tank radius/12 for roofs 0.167" thick or thicker.

Thickness of shell more than 25' below top edge

0.240" for primary tank. 0.167" for secondary tank.

If anchor devices are required they must be attached to the primary tank only.

Required. Design per Figure 2. If tailing lugs are required they are per Figure 2.

Minimum distance between the center of two fittings shall not be less than the sum of their diameters.








Not allowed.

Not allowed.

Manways None required.

Vacuum test




Schedule 40 pipe up to 12". Reinforcing pads are not required.

Standard weight pipe for fittings in single wall tanks. For double wall tanks the minimum wall thickness is the thickness of the primary tank shell. No reinforcing pads are required.



Secondary containment shells not in intimate contact with primary tank

Allows for shells not in direct contact with the primary tank as long as they have a means to securely position the primary tank within the secondary containment shell.



Tested at 1-1/2 psig minimum and 2-1/2 psig maximum.

Tested at 30 kPa (4.5 psig) minimum and 35 kPa (5 psig) maximum for tanks 1750 mm (69") diameter and less.

Tested at 20 kPa (2.9 psig) minimum and 30 kPa (4.5 psig) maximum for tanks 1750 mm (69") to 3000 mm (118") diameter.

Tested at 10 kPa (1.5 psig) minimum and 20 kPa (2.9 psig) maximum for tanks 3000 mm (118") to 4000 mm (157.48") diameter.


Vacuum test interstice at minimum of 81 kPa (24" mercury) for 5 hours with the vacuum dropping no lower than 67.5 kPa (20" mercury). After this test the interstice with a minimum of 51 kPa (15" mercury) for 5 days with a drop in vacuum not to exceed 9 kPa (2.65" mercury). This is in addition to the pressure test.





Other devices None.

No specifications.

Weak shell-to-roof Not allowed.

Painting One primer coat is required.

Rim Angle (if used) Only specifed for weak shell-to-roof.

A gauge chart and gauge stick shall be supplied with the tank. Tanks equipped with a fill pipe connection at the top of the tank must ship with spill containment and overspill protection devices.

Uniform Specification Tanks

Must be fabricated to the design in Figure 1. This specifies fitting sizes and locations.

Allowed if meets the requirements of paragraph 15.5.2 thru 15.5.6.

None required. (If tank is coated, recommends the bottom surface of the tank not be coated if the tank is intended to be in direct contact with grade without integral cathodic protection.)

35 mm x 35 mm x 6 mm (1.38" x 1.38" x 0.236") for tanks up to and including 1500 mm (59") diameter. 55 mm x 55 mm x 6 mm (2.17" x 2.17" x 0.236") for tanks over 1500 mm diameter.


1)

2) Maximum tank height is 35' for UL-142.3) Maximum Diameter is 4000mm (157.48") for ULC. UL-142 has no maximum.4) Maximum height is 4 x diameter for both UL-142 and ULC.5) Maximum capacity for UL-142 is 50000 gallon and 46260 gallons (175000 L) for ULC.6)

7)

8)

9) ULC specifies all steel shall have a minimum yield strength of 200MPa (29000 psi).10)

11) ULC specifies the maximum size of any connection shall not be greater than 1/2 the tank radius.12)

13) ULC specifies that anchor devices must be attached to the primary tank only.14)

15)

16)

17) ULC requires all double wall tanks be shipped with a minimum vacuum of 51 kPa (15 inches of mercury).

18)

19)

20)

21) ULC limits the size of threaded connections located below liquid level to a maximum of 3" pipe size.

All parts of shells more than 25' below top edge must be 0.240" for primary and 0.167" for secondary for UL-142.

Per UL-142 the cone height is radius/6 for roofs made of less than 0.167" steel and radius/12 for roofs made of 0.167" or thicker steel. ULC is diameter/10 for all thicknesses.

Per UL-142 the actual tank capacity can exceed the nominal rated capacity by 10%. Per ULC the actual capacity can exceed the nominal rated capacity by only 2.5%.

ULC requires lifting lugs and specifies the design in Figure 2. If tailing lugs are required (they do not speciy when they are required) they shall be Figure 2.

ULC specifies the minimum distance between the center of two fittings shall not be less than the sum of their diameters.

ULC includes a non-mandatory appendix (Appendix A) which gives the maximum wind velocity and maximum seismic zones for unachored tanks. It also gives maximum snow loads for roofs. Although they say it is non-mandatory, they also state that the stability of unanchored tanks whould be verified with the data contained in Appendix A.

UL-142 specifies that primary and secondary tanks be air tested at 1-1/2 psig (10 kPa) minimum and 2-1/2 psig (17 kPa) maximum. ULC specifies the minimum shall be 30 kPa (4-1/2 psig) and a maximum of 35 kPa (5 psig) for tans 1750 mm (69") in diameter and less. For tanks from 1750 mm to 3000 mm (118") in diameter the minimum is 20 kPa (2.9 psig) and maximum of 30 kPa. From 3000 mm to 4000 mm (157.48") in diameter the minimum is 10 kPa (1-1/2 psig) and maximum of 20 kPa.

UL-142 has an option to vacuum test the interstice at 13 inches of mercury for a minimum of 12 hours with vacuum maintained at plus or minus 2 inches of mercury. This can be done instead of the pressure test. ULC specifies that after the pressure test is completed, the interstice shall be tested at 81 kPa (24 inches of mercury) for 5 hours with the vacuum dropping no lower than 67.5 kPa (20 inches of mercury). After this test the tank shall be tested with a minimum vacuum of 51 kPa (15 inches of mercury) held for a period of 5 consecutive days with a drop of vacuum not to exceed 9 kPa (2.65 inches of mercury).


ULC requires a spill containment device and an overfill protection device be supplied with all tanks equipped with a fill pipe connection at the top of the tank.

Per ULC all uniform specification tanks shall be fabricated to the design in Figure 1. This specifies fitting sizes and locations.

UL-142 specifies the flange depth on flat flanged heads to be 5 times the head thickness, but not less than 1/2". ULC specifies it as being 6 times the head thickness, but not less than 25 mm (1 inch).


22)

23)

24) UL-142 allows thinner material to be used if it is stainless steel. ULC does not.25)

26)

27) Weak shell-to-roof is allowed by UL-142 but not by ULC.28) One coat of primer is required by UL-142. None is required by ULC.29) Size of rim angle is specifed by ULC but not by UL-142 except for weak shell-to-roof.

ULC specifies that flanged connections below liquid level can be made from standard weight pipe without any reinforcing pads. UL-142 specifies standard weight pipe for fittings in the roof and ex-hvy pipe for fittings in the shell. This is different than on horizontal tanks. (The new draft changes this to Sch 40 pipe).


UL-142 requires a manway in all tanks exceeding 5000 gallon capacity. ULC does not require a manway. (UL-142 deletes this requirement in the new draft.)

UL-142 defines an atmospheric tank as one that has been designed to operate at pressures from atmospheric through 0.5 psig (3.4 kPa). ULC has a range on the allowable internal pressure from 1.0 kPa (0.145 psig) to 9.4 kPa (1.36 psig) depending upon the tank height and diameter. The values are listed in table A2 and are for unanchored tanks.

Manway ComparisonUL-142 and ULC-S601 Horizontal Aboveground Tanks


Sizes Minimum 600 mm (24") diameter.

Other types

Limitations None.

Reinforcing Pads Not required.

Machining Not required.

24" Manway Dimensions

Projections

Same as manway.

Long Bolt Manway Bolts

24" to 36" (The new draft removes anything under 24".)

Reverse flanged manways allowed on the top of the tank.

Allows other types as long as they are designed by a Registered Professional Engineer. Manways must have reinforcing pads.

Design 9.1 is allowed on tanks up to 50000 L (13000 gallons). Design 9.2 is required on all tanks larger than 50000 L.

Required on all manways in tanks or compartments larger than 50000 L. Required for all manways installed on a head of tanks 3000 mm (118") diameter and larger.

Required on all flanges and covers of manways located below the liquid level.

28-1/2" OD with (24) 1/2" bolts on a 27" BC. Minimum material thickness is 0.167". Full face or ring gaskets may be used.

Design 9.1: 750 mm (29.5") OD with (24) M16 (5/8") bolts on a 700 mm (27.5") BC. Flange and cover are 10 mm (0.394") thick and the neck is 16 mm (0.63") thick. The neck protrudes through the flange and must be machined. Ring gasket is required.

Design 9.2: 830 mm (32.68") OD with (28) M20 (0.79") bolts on a 770 mm (30.32") BC. Flange and cover are 9.5 mm (0.375") thick and the neck is 6 mm (0.24") thick. Full face gasket is required.

A manway made of 6 mm (0.24") thick material with the neck and flange formed as one piece with dimensions the same as Design 9.2 may be used above liquid only.

2 times neck thickness minimum. 2" minimum for tanks 72" in diameter and larger.

180 mm +/- 10 mm (7.09" +/- 0.394") for manways on the top of the tank.

80 mm +/- 10 mm (3.15" =/- 0.394") for manways below the liquid level.

Long Bolt Manway Covers

4.5 mm (0.177") thick with a straight flange of 30 mm +/- 5 mm (1.18" +/- 0.197").

1/2 of the number normally installed in the manway.

3 required seal welded to the cover with double lock nuts.

Manway ComparisonUL-142 and ULC-S601 Horizontal Aboveground Tanks


Minimum 1-1/2".Lift on Long Bolt Manway

Minimum 45 mm (1.77") between the face of the flange and the bottom of the lip on the cover.

Comparison of Manways UL-142 and ULC-S601 Horizontal Aboveground Tanks

1)

2)

3)

4)

5)

6)

7) ULC requires machining of all flanges and covers of manways that are located below the liquid level.

8)

9)

10)

11)

12) UL-142 long bolt manways are required to have 1/2 of the normal bolts installed in the manway.

13)

Per UL-142, manways in sizes from 16" to 36" may be used. Manways for ULC tanks must be a minimum of 600 mm (24") diameter. (UL-142 draft deletes manways under 24".)

For manways installed on the top of the tank, UL-142 allows a reverse flanged manway. ULC does not have this as part of their listing.

24" manways per UL-142 are 28-1/2" OD with (24) 1/2" bolts on a 27" bolt circle. All material is 0.167" minimum thickness. Per ULC, there are two different designs.

ULC design no. 9.1 is 750 mm(29.5") OD with (24) M16 (5/8") bolts on a 700 mm (27.5") bolt circle. The flange and cover are 10 mm (.394") thick and the neck is 16 mm (.63") thick. The neck protrudes through the flange and has to be machined. The gasket is a ring gasket.

ULC design no. 9.2 is 830 mm (32.68") diameter with (28) M20 (.79") diameter bolts on a 770 mm (30.32" bolt circle. The flange and cover are 9.5 mm (.375") thick and the neck is 6 mm (.24") thick. The gasket is a full face gasket.

ULC design no. 9.1 is allowed on tanks up to 50000 L (13000 gallon) capacity. Design 9.2 is required on all tanks larger than 50000 L.

ULC requires reinforcing pads be installed on all manways in tanks or compartments greater than 50000 L (13000 gallon).

ULC requires reinforcing pads be installed on all manways located on the tank head for tanks 3000 mm (118") in diameter and greater.

ULC allows a manway made of 6 mm (.24") thick material that has the flange and neck formed as one piece to be used only above the high liquid level. The dimensions are the same as design 9.2.

ULC allows other manways as long as they are designed by a Registered Professional Engineer and the manway must have a reinforcing pad.

UL-142 gives a minimum projection of 2" for tanks 72" in diameter and larger. ULC requires a projection of 180 mm +/- 10 mm (7.09" +/- .394") for manways on the top of a tank and 80 mm +/- 10 (3.15" =/- .394") for manways below the highest liquid level.

ULC allows a long bolt manway for emergency venting. The manway dimensions must meet the requirements of design 9.1 or 9.2. The cover is to be 4.5 mm (0.177") thick with a straight flange 30 mm +/- 5 (1.18" +/- 0.197") long. It uses 3 bolts seal welded to the cover and double lock nuts.

ULC requires long bolt manway covers to have an open space of 45 mm (1.77") minimum between the manway flange and the bottom lip of the manway cover.

Manway ComparisonUL-142 and ULC-S630 Vertical Aboveground Tanks


Sizes

Other types

Limitations None.

Reinforcing Pads Not required.

Machining Not required.

Roof Manway Projection 6"

Same as roof manway.


24" to 36" diameter. (The new draft removes anything under 24".)

Minimum 500 mm (20") diameter for roof manways. Minimum 600 mm (24") diameter for shell manways.

Reverse flanged manways allowed on the roof or shell of the tank.

Allows other types as long as they are designed by a Registered Professional Engineer. Reinforcing pads are required.

Design 8.2 is allowed on tanks up to 50000 L (13000 gallons). Design 8.3 is required on all tanks larger than 50000 L. Roof manways must have welded joints for flange to neck (integral flange and neck are not allowed).

Required on all manways in the shell of tanks larger than 50000 L.

Required on all flanges and covers of manways located below the liquid level.

Dimensions for 24" manway in shell.

Per draft, 32-3/4" OD with (28) 3/4" bolts on 30-1/4" BC. Neck thickness is the same as the shell. Cover thickness varies from 3/8" to 1/2" and the flange from 1/4" to 3/8" depending upon the tank height.


Design 8.3: 830 mm (32.68") OD with (28) M20 (0.79") bolts on a 770 mm (30.32") BC. Flange and cover are 9.5 mm (0.375") thick and the neck is 6 mm (0.24") thick. Full face gasket is required.

Roof Manway Dimensions

(20" manway is not in the new draft.) For 24" manway the dimensions are 28-1/2" OD with (24) 1/2" bolts on a 27" BC. Minimum material thickness is 0.167". Full face or ring gaskets may be used.

Design 8.1: 620 mm (24.41") OD with (20) M12 (1/2") bolts on a 580 mm (22.84") BC. All material is 6 mm (0.24") thick.


Shell Manway Projections







Manway ComparisonUL-142 and ULC-S630 Vertical Aboveground Tanks


Minimum 1-1/2".Lift on Long Bolt Manway

Minimum 58 mm (2.28") between the face of the flange and the bottom of the lip on the cover for manways with 600 mm inside diameter.

Minimum 64 mm (2.52") between the face of the flange and the bottom of the lip on the cover for manways with 500 mm inside diameter.

Comparison of Manways UL-142 and ULC-S630 Vertical Aboveground Tanks

1)

2)

3)

4)

5)

6)

7)

8) ULC requires reinforcing pads be installed on all manways in tanks greater than 50000 L (13000 gallon).

9) ULC requires machining of all flanges and covers of manways that are located below the liquid level.10)

11)

12)

13)

14) UL-142 long bolt manways are required to have 1/2 of the normal bolts installed in the manway.15)

16)

Per UL-142, manways in sizes from 16" to 36" may be used for manways. (UL-142 draft deletes all manways less than 24"). Manways for ULC tanks must be a minimum of 500 mm (20") diameter for roof manways and must be a minimum of 600 mm (24") diameter.

For manways installed on the roof of the tank, UL-142 allows a reverse flanged manway. ULC does not have this as part of their listing. (UL-142 draft allows reverse flanged manway on the roof or shell of the tank.)

20" roof manways per UL-142 are 24-1/2" OD with (20) 1/2" bolts on a 23" bolt circle. All material is 0.167" minimum thickness. Per ULC, the roof manway must be 620 mm +/- 10 (24.41" +/- 0.394") OD with (20) M12 (1/2") diameter bolts on 580 mm +/- 5 (22.84" +/- 0.197") bolt circle. All material is 6 mm (0.24"). (UL-142 draft does not allow 20" manway.)

ULC requires roof manway neck to flange be welded. They do not indicate that a intergal formed neck is allowed.

On roof manways, UL-142 shows a projection of 6". ULC shows a projection of 180 mm +/- 10 (7.09" +/- 0.394").

24" manways for below liquid per UL-142 are 28-1/2" OD with (24) 1/2" bolts on a 27" bolt circle. Neck material is 0.167" minimum thickness. (The UL-142 draft changes this to match Table 9.4). Flange and cover thickness depends upon the height of the tank and is per Table 9.3. The cover thickness will range from 3/8" to 1/2" thick and the flange thickness will range from 1/4" to 3/8" thick. Per ULC, there are two different designs.


ULC design no. 8.3 is 830 mm (32.68") diameter with (28) M20 (.79") diameter bolts on a 770 mm (30.32" bolt circle. The flange and cover are 9.5 mm (.375") thick and the neck is 6 mm (.24") thick. The gasket is a full face gasket.

ULC design no. 8.2 is allowed on tanks up to 50000 L (13000 gallon) capacity. Design 8.3 is required on all tanks larger than 50000 L.

ULC allows a manway made of 6 mm (.24") thick material that has the flange and neck formed as one piece to be used only above the high liquid level. The dimensions are the same as design 8.3.

ULC allows other manways as long as they are designed by a Registered Professional Engineer and the manway must have a reinforcing pad.

UL-142 gives a minimum projection of 2" for tanks 72" in diameter and larger. ULC requires a projection of 180 mm +/- 10 mm (7.09" +/- .394") for manways on the top of a tank and 80 mm +/- 10 (3.15" =/- .394") for manways below the highest liquid level.

ULC allows a long bolt manway for emergency venting. The manway dimensions must meet the requirements of design 8.1, 8.2 or 8.3. The cover is to be 4.5 mm (0.177") thick with a straight flange 30 mm +/- 5 (1.18" +/- 0.197") long. It uses 3 bolts seal welded to the cover and double lock nuts.

UL-142 has a requirement that if the manway is larger than 24" diameter and is below liquid it is to have the dimensions and bolting per table 9.4 in addition to the thicknesses of table 9.3.

ULC requires long bolt manway covers to have an open space of 58 mm (2.28") minimum between the manway flange and the bottom lip of the manway cover for manways with 600 mm inside diameter and an open space of 64 mm (2.52") minimum with 500 mm inside diameter manways.

Manway ComparisonUL-142 and ULC/ORD-C142.18 Rectangular Aboveground Tanks


Sizes

Other types No other design allowed.

Limitations None. Allows only design 5.1.Reinforcing Pads Not required.

Machining Not required. Required on all manways of Design 5.1.24" Manway Dimensions

Projections

Same as manway.


Minimum 1-1/2".

24" to 36" (The new draft removes anything under 24".)

Minimum 500 mm (20") diameter. (However, paragraph 3.8.1 says it shall be in accordance with Figure 5 which calls for 600 mm (24").)

Reverse flanged manways allowed on the top of the tank.

Required on all manways in tanks larger than 50000 L. Required for all manways installed on the side of the tank.

28-1/2" OD with (24) 1/2" bolts on a 27" BC. Minimum material thickness is 0.167". Full face or ring gaskets may be used.









Lift on Long Bolt Manway

Minimum 100 mm (3.94") between the face of the flange and the bottom of the lip on the cover.

Comparison of Manways UL-142 and ULC/ORD-C142.18 Rectangular Aboveground Tanks

1)

2)

3)

4)

5) ULC requires reinforcing pads be installed on all manways located on the tank sides.

6)

7)

11)

12) UL-142 long bolt manways are required to have 1/2 of the normal bolts installed in the manway.

13)

Per UL-142, manways in sizes from 16" to 36" may be used. (UL-142 draft deletes all manways less than 24") Manways for ULC tanks must be a minimum of 600 mm (24") diameter. (Paragraph 3.8.3 of ULC says the inside diameter shall be greater than 500 mm. However, paragraph 3.8.1 says it shall be in accordance with Figure 5 which calls for 600 mm.)

For manways installed on the top of the tank, UL-142 allows a reverse flanged manway. ULC does not have this as part of their listing.

24" manways per UL-142 are 28-1/2" OD with (24) 1/2" bolts on a 27" bolt circle. All material is 0.167" minimum thickness. Per ULC, there is only one design that is acceptable. This is different than in the horizontal specification.


ULC requires reinforcing pads be installed on all manways in tanks greater than 50000 L (13000 gallon). (The horizontal specification also says this applies to compartments greater than 50000 L. The rectangular specification only mentions tank capacities exceeding 50000 L.)

The ULC rectangular specification does not allow for any other manway. This is different than for the ULC horizontal tanks where ULC allows other manways as long as they are designed by a Registered Professional Engineer and the manway must have a reinforcing pad.

UL-142 gives a minimum projection of 2" for tanks 72" in diameter and larger. ULC requires a projection of 180 mm +/- 10 mm (7.09" +/- .394") for manways on the top of a tank and 80 mm +/- 10 (3.15" =/- .394") for manways on the side of the tank.

ULC allows a long bolt manway for emergency venting. The manway dimensions must meet the requirements of design 5.1. The cover is to be 4.5 mm (0.177") thick with a straight flange 30 mm +/- 5 (1.18" +/- 0.197") long. It uses 3 bolts seal welded to the cover and double lock nuts.

ULC requires long bolt manway covers to have an open space of 100 mm (3.94") minimum between the manway flange and the bottom lip of the manway cover. This is over twice as much as is required for horizontal tanks and almost twice as much as is required for vertical tanks.

Welding ComparisonUL-142 and ULC-S601 Horizontal Aboveground Tanks

Shell Joints of Primary TankUL-142 Figure 6.1 UL-142 limitations ULC Figure 5 ULC limitations

No. 2 None S5.1

No. 1 None S5.2 NoneNo. 2 None S5.3 NoneNo. 4 Minimum lap is 1/2". S5.4 (see Note 1)No. 6 S5.5

No. 3 S5.6

No. 5 Not allowed.

Up to 2000 mm (78.74") diameter 1000 mm (39.37")Over 2000 mm to 2500 mm (98.43") diameter 1250 mm (49.21")Over 2500 mm to 3000 mm (118.11") diameter 1500 mm (59.06")Over 3000 mm to 3600 mm (141.73") diameter 1750 mm (68.90")Over 3600 mm to 4000 mm (157.48") diameter 2000 mm (78.74")

Maximum diameter = 1500 mm (59") and maximum thickness = 4.5 mm (0.177")

Maximum diameter = 65". Minimum overlap = 1/2" for tanks 48" in diameter and less and 3/4" for tanks over 48" diameter.

Maximum diameter = 2500 mm (98.4") and maximum thickness = 7 mm (0.276"). Minimum overlap = 12 mm (0.473"). For longitudinal joints this joint must be located within 135 degrees of top centerline (if saddles are on the tank this joint shall be within 115 degrees of top centerline). (see also Note 1) (Note 1 does not apply to longitudinal seams if the inside lap is positioned down in order to permit liquid to run out of the joint)

Minimum overlap is 1/2" for tanks 48" in diameter and less and 3/4" for tanks over 48" diameter. Inside can be skip welded 1" in 12" or seal welded.

Minimum overlap is 12 mm (0.473"). Inside can be skip welded 50 mm in 350 mm (2" in 14") or seal welded. (see also Note 1)

Minimum lock weld is 1/2" diameter spaced no more than 12" apart. Minimum overlap is 3 times the lock weld diameter.

Note 1: All tanks 10000 L (2643 gallons) and larger shall have all inside longitudinal joints seal welded. They shall also have seal welding on the inside bottom circumferential for the following lengths:


Head to Shell Joints of Primary TankUL-142 Figure 6.2 UL-142 limitations ULC Figure 6 ULC limitations

H6.1

No. 1 & No. 2 None H6.2 NoneH6.3 None

No. 7 Minimum overlap is 1/2" H6.4 None

No. 3 & No. 4 Minimum overlap is 1/2" H6.5

No. 6 H6.6

Not allowed H6.7

Not allowed H6.8 Head bracing is required.No. 5 Minimum overlap is 1/2" Not allowedNo. 8 Minimum overlap is 1/2" Not allowed

No. 9 & No. 10 None Not allowed

Not allowed (Figure 6.2 does not show any single welded joints even if they are full penetration).

Maximum diameter = 1500 mm (59") and maximum thickness = 4.5 mm (0.177")


Maximum diameter = 2500 mm (98.4") and maximum thickness = 7 mm (0.276"). Minimum overlap = 12 mm (0.473"). For tanks up to and including 1300 mm (51.18") diameter and a maximum shell thickness of 2.5 mm (0.098") the minimum overlap is 8 mm (0.315"). (see also Note 1)

Minimum overlap is 1/2". Inside weld can be skip welded 1" in 12" or be seal welded.

Minimum overlap is 12 mm (0.473"). Inside can be skip welded 50 mm in 350 mm (2" in 14") or seal welded. (see also Note 1)

Maximum diameter = 1500 mm (59") and maximum thickness = 4.5 mm (0.177"). Head bracing is required.


Fittings Above the Liquid Level in Primary TankUL-142 Figure 7.1 UL-142 limitations ULC Figure 8 ULC limitations

No. 3, 4, 6, & 7 None No. 8.1 & No. 8.2No. 2 & 5 None No. 8.3 (Coupling) Maximum diameter = 141.3 mm (5" pipe size)

No. 5 No. 8.4

No. 8 No. 8.5

Reinforcing pads are not required. No. 8.6

No. 1 None Not allowed

(Tank Flange) Maximum diameter = 141.3 mm (5" pipe size)

Only requires fillet weld on the outside. May we welded on the inside.

(Coupling) Maximum diameter = 168.3 mm (6" pipe size). Welding required is either a fillet weld in and out or a groove weld on the outside with a fillet weld.

Only requires fillet weld on the outside. May we welded on the inside. May be trimmed flush.

(Pipe with Flange) Maximum diameter is 273 mm (10" pipe size). Welding required is either a fillet weld in and out or a groove weld on the outside with a fillet weld. Fillet weld size is equal to the neck thickness. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 3 times the neck thickness.

(Pipe with Flange and reinforcing pad) Maximum diameter is 610 mm (24" pipe size). Welding required for the neck to the shell is either a groove weld on the outside or a groove weld on the inside with a 6 mm (1/4") fillet weld on the inside. A fillet weld equal to the thickness of the neck is required on the outside between the neck and the reinforcing pad and a fillet weld equal to the shell thicknessis required between the reinforcing pad and the shell. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 2 times the shell thickness.


Fittings Below the Liquid Level in Primary TankUL-142 Figure 7.1 UL-142 limitations ULC Figure 8 ULC limitations

No. 3, 4, 6, & 7 None No. 8.1 & No. 8.2

No. 2 & 5 None No. 8.3 (Coupling) Maximum diameter = 88.9 mm (3" pipe size)

No. 5 No. 8.4

No. 8 Not allowed







(Pipe with Flange and reinforcing pad) Maximum diameter is 610 mm (24" pipe size). Welding required for the neck to the shell is either a groove weld on the outside or a groove weld on the inside with a 6 mm (1/4") fillet weld on the inside. A fillet weld equal to the thickness of the neck is required on the outside between the neck and the reinforcing pad and a fillet weld equal to the shell thicknessis required between the reinforcing pad and the shell. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 2 times the shell thickness. Fittings less than 114.3 mm (4" pipe size) shall have a wall thickness equal to or greater than the shell thickness and do not require reinforcing pads.


Manways installed in the Primary TankUL-142 Figure 9.1 UL-142 limitations ULC Figure 9 ULC limitations

No matching configuration 9.1

No. 1,4,5 & Fig. 9.2 9.2

No. 2,3,6,7,8 & 9 Must be installed above liquid. Not allowed

Secondary Containment Tanks:

Maximum of 50000 L (13000 gallon) tank. Fillet welds in and out equal to the shell thickness are required. Flange is attached to the neck with a groove weld and a fillet weld both from the underside of the flange. Cannot be used on the head of a tank.

Flange can be attached to manway neck with a single fillet on the outside or a double fillet weld or they may be integrally formed. Manways installed on the top of tank can be installed with a single fillet weld on the outside. Manways installed below the liquid level require a fillet weld in and out. No reinforcing pad is required.

Flange can be attached to neck with a single outside fillet or a double fillet weld. Integrally formed necks are only allowed on manways above the liquid level. Reinforcing pad is required and is fillet welded in and out to the manway neck. Reinforcing pad is welded on the outside to the tank. Reinforcing pad is welded on the inside to the cutout in the shell.

Attachment of secondary shells for shells with intimate contact is a fillet weld for both UL-142 and ULC. ULC indicates that the shell is to be stitch welded to the primary tank 50 mm in 500 mm (2" in 20").

Attachment of the double bulkheads is by full fillet welds for both UL-142 and ULC. However, ULC has an option on double wall tanks to double butt weld the bulkheads to the shell which creates two tanks and then using a connecting ring stitch welded to the tanks to connect them into one. The secondary shell is then wrapped over this.

ULC (in Figure 12) shows fittings installed in tanks with secondary containment to be fillet welded to the outside of the primary tank. A closing plate is then placed over the fitting and is fillet welded to the fitting and the outside of the closing plate is fillet welded to the secondary shell. UL-142 does not show any details for attaching fittings on secondary contained tanks.

Welding ComparisonUL-142 and ULC-S630 Vertical Aboveground Tanks

Shell Joints of Primary TankUL-142 Figure 6.1 UL-142 limitations ULC Figure 3 ULC limitations

No. 2 None S3.1

No. 1 None S3.2 NoneNo. 2 None S3.3 NoneNo. 4 Minimum lap is 1/2". S3.4

No. 6 S5.5

No. 3 Not allowed.

No. 5 Not allowed.

Maximum diameter = 1500 mm (59") and maximum thickness = 3 mm (0.118")

Open side of the seam must be facing downwards in order that liquid runs out of the seam.

Maximum diameter = 65". Minimum overlap = 1/2" for tanks 48" in diameter and less and 3/4" for tanks over 48" diameter.

Maximum diameter = 1500 mm (59") and maximum thickness = 3 mm (0.118"). Minimum overlap = 12 mm (0.473"). Open side of the seam must be facing downwards in order that liquid runs out of the seam.

Minimum overlap is 1/2" for tanks 48" in diameter and less and 3/4" for tanks over 48" diameter. Inside can be skip welded 1" in 12" or seal welded.



Bottom to Shell Joints of Primary TankUL-142 Figure 6.3 UL-142 limitations ULC Figure 4 ULC limitations

Not allowed B4.1

No. 1 B4.2 The minimum projection is 25 mm (1").

No. 5 None B4.3 NoneNot allowed B4.4

No. 2 B4.5 The minimum overlap is 12 mm (0.472").

No. 3 Not allowed

No. 4 Not allowed

Splices Splices Double butt welding required.

Maximum diameter = 1500 mm (59"). The minimum projection is 25 mm (1").

Minimum projection is 1/2" or 1.5t whichever is greater.

The minimum overlap is 12 mm (0.472"). (Bottom head is offset with a seal weld on the inside.)

Minimum overlap is 1/2" or 1.5t whichever is greater.



May use any joint in Figure 6.1 except joint 6 unless made of more than 4 pieces and then it must be double butt welded.


Roof JointsUL-142 Figure 6.4 UL-142 limitations ULC Figure 5 ULC limitations

R5.1

No. 9 None R5.2 NoneNot allowed R5.3 None (Straight flange of roof is offset.)

No. 10 Minimum overlap is 1/2". R5.4 Minimum overlap is 12 mm (0.472")No. 5 None R5.5 NoneNo. 3 Inside fillet of angle to shell shall be tack welded. R5.6

No. 6 None R5.7 NoneNo. 4 Inside fillet of angle to shell shall be tack welded. R5.8

Not allowed R5.9

No. 1 None Not allowed.No. 2 None Not allowed.No. 8 None (Shell is offset.) Not allowed.

No. 11 Not allowed.

Splices Splices Double butt welding required.

Not allowed. (Single welded butt joints with full penetration are not shown.)

Maximum diameter = 1500 mm (59") and maximum thickness = 3 mm (0.118")

Minimum overlap of angle to shell is 12 mm (0.472"). Inside fillet weld of angle to shell is skip welded 50 mm in 350 mm (2" in 14")



Minimum overlap is 1/2". (Roof is lapped on outside of shell.)

May use any joint in Figure 6.1 unless made of more than 4 pieces and then it must be double butt welded.


Fittings in the RoofUL-142 Figure 7.1 UL-142 limitations ULC Figure 7 ULC limitations

No. 8 & Fig. 7.3 None (Reinforcing pads may be added) No. 7.1 NoneNo. 5 & Fig. 7.3 None (Reinforcing pads may be added) No. 7.2 NoneNo. 1,2,3,4,6,7,9 None Not allowed.


Flange None No. 6.1 & No. 6.2

Not allowed. No. 6.3 (Coupling) Maximum diameter = 88.9 mm (3" pipe size)

Threaded Type None No. 6.4

None. Reinforcing plates may be used. No. 6.5



Flange without Reinforcing Plate

Maximum diameter is 610 mm (24" pipe size). Welding required for the neck to the shell is either a groove weld on the outside or a groove weld on the inside with a fillet weld on the inside. Fillet welds are equal to the thickness of the neck. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 3 times the neck thickness.Reinforcing pads are not required.


Manways installed in the Primary Tank ShellUL-142 Fig. 9.2 & 9.4 UL-142 limitations ULC Figure 8 ULC limitations


Fig. 9.2 8.3

Fig. 9.4 Not allowed

Maximum of 50000 L (13000 gallon) tank. Fillet welds in and out equal to the shell thickness or 8 mm (0.315") maximum are required. Flange is attached to the neck with a groove weld and a fillet weld both from the underside of the flange. Neck edge must be machined.

Flange can be attached to manway neck with a single fillet on the outside or a double fillet weld or they may be integrally formed. A fillet weld equal to the minimum steel thickness is required in and out. No reinforcing pad is required.

Flange can be attached to neck with a single outside fillet or a double fillet weld. Integrally formed necks are only allowed on manways above the liquid level. Reinforcing pad is required and is fillet welded in and out to the manway neck. Reinforcing pad is welded on the outside to the tank. Reinforcing pad is welded on the inside to the cutout in the shell. Flange and cover must be machined.

Flange can be attached to manway neck with a double fillet or a fillet and a groove or may be integrally formed. A reinforcing pad is required with fillet welds in and out.



No. 1 & 5 8.1


No. 1,4,5 & Fig. 9.2 8.3



Flange can be attached to manway neck with a single fillet on the outside or a double fillet weld or they may be integrally formed. Manways installed on the top of tank can be installed with a single fillet weld on the outside. No reinforcing pad is required.

Flange can be attached to neck with a single outside fillet or a double fillet weld. Single fillet weld 6 mm (0.236") minimum or thickness of the roof is used to attach neck to roof. Reinforcing pad is not required.

Fillet welds in and out equal to the shell thickness or 8 mm (0.315") maximum are required. Flange is attached to the neck with a groove weld and a fillet weld both from the underside of the flange. Neck edge must be machined.

Flange can be attached to manway neck with a single fillet on the outside or a double fillet weld or they may be integrally formed. Manways installed on the top of tank can be installed with a single fillet weld on the outside. No reinforcing pad is required.

Flange can be attached to neck with a single outside fillet or a double fillet weld. Integrally formed necks are allowed on manways above the liquid level. Reinforcing pad is not required.

Attachment of secondary shells for shells with intimate contact is a fillet weld for both UL-142 and ULC. ULC indicates that the shell is to be stitch welded to the primary tank.

ULC has a Figure 11 which shows various combinations of secondary bottom connections related to the type of primary bottom connection. They also have a Figure 12 with another option that uses an elbow to maintain continutiy between the shell and bottom of the interstice. UL-142 does not give any specifics.


Welding ComparisonUL-142 and ULC/ORD-C142.18 Rectangular Aboveground Tanks

Side Wall JointsUL-142 Figure 6.1 UL-142 limitations ULC Figure 1 ULC limitations

No. 2 None S4.1 Maximum shell thickness = 4.5 mm (0.177")No. 1 None S4.2 NoneNo. 2 None S4.3 NoneNo. 4 Minimum lap is 1/2". S4.4 NoneNo. 6 Minimum overlap = 1/2". S4.5

No. 3 S4.6 None. Minimum overlap is 12 mm (0.472").

No. 5 Not allowed.

Maximum shell thickness = 7 mm (0.276"). Minimum overlap is 12 mm (0.472").

Minimum overlap is 1/2". Inside can be skip welded 1" in 12" or seal welded.



Corner Joints (Excluding the Bottom)UL-142 Figure 6.5 UL-142 limitations ULC Figure 2 ULC limitations

H5.1 None

Not shown. H5.2 NoneH5.3 None

No. 4 None H5.4 None

No. 2 None H5.5 NoneNot shown. H5.6 None

No. 6 None H5.7 NoneNot shown. H5.8 None

No. 1 None Not allowedNo. 3, 5, 7, 8, 9, 10 None Not shown.

No. 11 & 12 None Not shown.

Bottom to Shell JointsUL-142 Figure 6.5 UL-142 limitations ULC Figure 3 ULC limitations

No. 7 None B3.1 NoneNo. 8 None B3.2 None

Not shown. B3.3 NoneNo. 9 None B3.4 None

No.10 None B3.5 NoneNo. 1, 2, 3, 4, 5, 6 None Not allowed

No. 11 & 12 None Not shown.




Fittings Above the Liquid Level in Primary TankUL-142 Figure 7.1 UL-142 limitations ULC Figure 4 ULC limitations

No. 3, 4, 6, & 7 None No. 4.1 & 4.2No. 2 & 5 None No. 4.3 (Coupling) Maximum diameter = 141.3 mm (5" pipe size)

No. 5 No. 4.4

No. 8 No. 4.5







(Pipe with Flange) Maximum diameter is 273 mm (10" pipe size). Welding required is either a fillet weld in and out or a groove weld on the outside with a fillet weld. Fillet weld size is equal to the neck thickness. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 3 times the neck thickness.

(Pipe with Flange and reinforcing pad) Maximum diameter is 610 mm (24" pipe size). Welding required for the neck to the shell is either a groove weld on the outside or a groove weld on the inside with a 6 mm (1/4") fillet weld on the inside. A fillet weld equal to the thickness of the neck is required on the outside between the neck and the reinforcing pad and a fillet weld equal to the shell thicknessis required between the reinforcing pad and the shell. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 2 times the shell thickness.



No. 3, 4, 6, & 7 None No. 4.1 & 4.2

No. 2 & 5 None No. 4.3 (Coupling) Maximum diameter = 88.9 mm (3" pipe size)

No. 5 No. 4.4

No. 8 Not allowed







(Pipe with Flange and reinforcing pad) Maximum diameter is 610 mm (24" pipe size). Welding required for the neck to the shell is either a groove weld on the outside or a groove weld on the inside with a 6 mm (1/4") fillet weld on the inside. A fillet weld equal to the thickness of the neck is required on the outside between the neck and the reinforcing pad and a fillet weld equal to the shell thicknessis required between the reinforcing pad and the shell. Fitting cannot be trimmed flush but must extend inside the tank a minimum of 2 times the shell thickness. Fittings less than 114.3 mm (4" pipe size) shall have a wall thickness equal to or greater than the shell thickness and do not require reinforcing pads.




No. 1,4,5 & Fig. 9.2 Not shown.



Maximum of 50000 L (13000 gallon) tank without a reinforcing plate. Over 50000 L a reinforcing plate is required. Fillet welds in and out equal to the shell thickness are required. Flange is attached to the neck with a groove weld and a fillet weld both from the underside of the flange. If used on the side of the tank, a reinforcing plate is required.

Flange can be attached to manway neck with a single fillet on the outside or a double fillet weld or they may be integrally formed. Manways installed on the top of tank can be installed with a single fillet weld on the outside. Manways installed below the liquid level require a fillet weld in and out. No reinforcing pad is required.

Attachment of secondary shells for shells with intimate contact is a fillet weld for both UL-142 and ULC. ULC indicates that the secondary shell is to be stitch welded to the primary tank. Various bottom joints for double wall tanks are given in Figure 11 and 12 of ULC.

Attachment of the double bulkheads is by full fillet welds for both UL-142 and ULC. However, ULC has an option on double wall tanks to double butt weld the bulkheads to the shell which creates two tanks and then using a connecting ring stitch welded to the tanks to connect them into one. The secondary shell is then wrapped over this.


Documents

ULC UL142 Comparison Spreadsheet