Compress Manual 2.4

Compress Manual 2.4.5

Page 4 of 79

START NEW FILE WITH DIV 1 OR 2 CODE (refer Section 2.1)

SET MODE OPTIONS (refer Section 3.1)

1. SCOPE OF THIS MANUAL This manual is supplementary instruction to HELP of COMPRESS. Content of the HELP is same with the COMPRESS MANUAL provided by CODEWARE.

In addition to that this manual provides specific instructions and guidelines for design of towers and vessels based on JGC standard design practices and Code requirements and it also guide User how to detail design some critical components.

This manual should be used for calculation of thickness and loading data that are required for preparation of Engineering Drawing. It is not intended to use COMPRESS for verification of existing equipment.

Note that COMPRESS can be used for the equipment design as per ASME code only i.e. either by ASME SEC VIII Division 1 or ASME SEC VIII Division 2.

2. WORK FLOW OF BUILDING NEW MODEL 2.1 How to Create New Model from New File

COMPRESS always starts with a new file with default settings. User can start new file from main FILE menu depending on the design code Div 1 or Div 2.

There are some common input settings in COMPRESS which remain the same through out the project. Template shall be prepared for such common inputs which can be used for any new design in that project. Refer to the following flowchart for the sequence of action.

CHOOSE ASME CODE EDITION & ADDENDA (refer Section 4.6.1)

DEFINE WIND LOADING (refer Section 4.6)

DEFINE SEISMIC LOADING (refer Section 4.6)

TO NEXT PAGE

Common settingsfor project.

SAVE FILE AS PROJECT TEMPLATE

REUSE TEMPLATE BY SAVE AS FOR NEW EQUIPMENT DESIGN (refer Section 2.1)


Page 5 of 79

2.2

FROM PREVIOUS PAGE

SELECT EQUIPMENT TYPE AND SET DATUM (refer Section 3.2)

CONSTRUCT ALL PRESSURE COMPONENTS (Heads, Shells, body flanges & transitions)

Always add the components from top to bottom for vertical vessel and from left side to right side for horizontal vessel.

(refer Section 4 1)

ADD NOZZLES (refer Section 4.3)

NO

ADD OTHER EXTERNAL ATTACHMENTS (PF/Ladders, clips, piping, insulation/lining, lifting lugs) (refer

Section 4 4)

ADD INTERNALS (Tray, packing bed) (refer Section 4.4)

ADD EXTERNAL LOADS, If any (refer Section 4.7)

Specific Settings for individual

i

RESULT WITHOUT A

WARNING?

YES

SELECT EQUIPMENT TYPE AND SET DATUM (refer Section 3.2)

CONSTRUCT ALL PRESSURE COMPONENTS (Heads, Shells, body flanges & transitions)

Always add the components from top to bottom for vertical vessel and from left side to right side for horizontal vessel.

(refer Section 4.1)

ADD STIFFENER RINGS, if required (refer Section 4.2.9)

ADD SUPPORTS (Saddles for Horizontal vessels and Skirt/legs/lugs for vertical

vessels)(refer Section 4.5)

ADD NOZZLES (refer Section 4.3)

RUN PROGRAM AND GENERATE REPORT

NO

ADD OTHER EXTERNAL ATTACHMENTS (PF/Ladders, clips, piping, insulation/lining, lifting lugs) (refer Section 4.4)

For Vertical Vessels with Skirt only

For Vertical Vessels without Skirt ADD SKIRT BASE RING

(refer Section 4.5.6)

ADD INTERNALS (Tray, packing bed) (refer Section 4.4)

ADD EXTERNAL LOADS (refer Section 4.7)

Save as for the specific equipment

SAVE

COMPLETION OF INPUT FILE EXCEPT ERECTED CONDITION. COPY AND INPUT FILE FOR ERECTED CONDITION. (refer Section 4.7)

ADD EXTRA WEIGHT IF REQUIRED (refer Section 4.7.2.4)

YES

Shell Dimension Check (refer Section 4.2.1.4) For Horizontal Vessels

RECTIFY THE WARNINGS


Page 6 of 79

Create & Use of Project Template User shall create a template for a project. Common settings such as Set Mode Option, Wind & Seismic loads, etc. shall be fixed and saved as a project template. When starting new equipment design, User can use this project template.

2.3 How to Create New Model from Other File To perform designs for a lot of equipment in short span of time, User can reuse input file of completed equipment for next similar equipment. Special care for reusing such files shall be taken to avoid any mistakes during input and all necessary fields shall be updated.

To reuse old file for new equipment, User shall follow below sequence or check points to avoid any mistakes;

a. Make sure the new equipment is of the same orientation (horizontal or vertical) and the similar shape to the old one.

b. Check whether any major components are required to be deleted or to be added.

c. If new equipment is not from same project, User shall check and confirm the data of the following settings; Set Mode Option Wind and Seismic inputs

d. Change the specific inputs for the individual equipment through Global change (Main Menu Action Menu Global Change).

User can only change inputs for pressure envelope components through Global Change. Common settings like design pressure, temperature, inside diameter, material, etc. can be conveniently changed to all of required components.

e. Check and revise inputs for supports (skirt, saddle).f. Check and revise inputs for all nozzles. User shall delete or add any

nozzle if required.


Page 7 of 79

g. Check and revise inputs for external attachments like vertical loads, insulation, etc.

h. Check and revise inputs for internals if any. i. Check the shape of equipment again before run for final design.


Page 8 of 79

3. HOW TO DECIDE OPTION 3.1 Set Mode Option

The Set Mode Option menu provides options which are required to set before starting any vessel design. These options shall remain the same through out the project, so required to set once at initial stage of project.

User can start the Set Mode Options from Action menu as shown below or by just press F7 key as a shortcut.

Supplemented technical information is described below for some important options.

3.1.1 UnitsUnit can be selected by Unit tab in the set mode option. (See 3.1)

User shall refer to the project specification for the applicable unit system.

If it is not specified, SI units shall be used.

In SI units the general inputs are as below;

Pressure kPa

Temperature oC

Dimensions mm


Page 9 of 79

3.1.2 Calculation General setting for calculation is available by Calculation tab in the set mode option. (See 3.1)

3.1.2.1 Vessel Design mode To design any new equipment, User shall select Get thickness from Pressure

3.1.2.1

3.1.2.2

3.1.2.3

3.1.2.4

3.1.2.5

3.1.2.6

3.1.2.7

3.1.2.8

3.1.2.9

3.1.2.10


Page 10 of 79

option. In this option COMPRESS will calculate the minimum required thickness of components for the specified loading. In this mode User shall note that COMPRESS will not automatically decrease the component thickness over those previously entered. If the design pressure is reduced, or wind or seismic codes reduced, use the Global Change option in Action menu to set all component thicknesses to 0 to allow COMPRESS to reselect the optimal thickness.

If User want to rate any existing designed vessel then select Get Pressure Rating option to get the Maximum Allowable Pressure in new and cold condition (MAP) and Maximum Allowable Working Pressure in old and corroded condition (MAWP) for thespecified thickness and corrosion allowance.

3.1.2.2 Cone-shell Juncture calculations If otherwise specified, calculation for cone is required for 30degree over half apex cone only. Select U-2(g) stress calculation for cone half apex > 30 only, which satisfies the ASME code requirement.

If the half apex angle > 30o, special stress analysis for the cone to shell juncture is required as mentioned in Div 1 appendix 1-5(g) and U-2(g). In this case, COMPRESS use Boardman analysis for stress analysis of cone to shell juncture. Refer to the Boardman analysis as Attachment 1.

Cone with knuckle or flare does not require any analysis.

As per figure UG-28.1 the cone to shell juncture can be taken as a line of support while designing the vessel for external pressure. As a default setting, keep the box of Junctures act as line of support checked, as code allows so. Uncheck the box

if there is any special requirement to prohibit this.

3.1.2.3 Calculate MAP and MAWP

Both boxes for Calculate MAP and Calculate MAWP shall be kept checked so that COMPRESS calculates the Maximum Allowable Pressure in new and cold condition (MAP) and Maximum Allowable Working Pressure in old and corroded condition (MAWP).

Calculated MAWP is used to calculate equipment hydrostatic test pressure as per


Page 11 of 79

UG-99(b) of Div 1. In most projects MAP and MAWP calculations are required.

If MAP and MAWP are not required to be calculated, COMPRESS equals them to the design pressure.

Nozzles are excluded from these options as there is a separate option available for nozzles in Nozzle 1 tab. Refer to section 3.1.4 of this manual.


Page 12 of 79

3.1.2.4 Limit MAWP User can limit the value of MAWP by this input. This can be useful when designing two separate components of certain geometry which is not supported by COMPRESS. In such case one component can govern MAWP of the other component. In rating mode this input must be greater than the design pressure.

As a default, keep the check box unchecked and entry in input box as zero which means COMPRESS shall calculate the MAP and MAWP in normal way.

3.1.2.5 Skirt/Legs/Saddles Stress Increase User shall leave this value as 1.0 (See note *2 below) for ASCE 7.For other

wind and seismic code, see requirement of the applicable code.

Allowable Stress Increase Summary

Code Load Load used for Combination Allowable Stress

ASCE

Wind (W) W (*3)

Pressure Parts 1.2 x Sa (*1)

Support (Structure Parts) Ks x Sa (*2)

Seismic (E) 0.7E (*4)

Pressure Parts 1.2 x Sa (*1)

Support (Structure Parts) Ks x Sa (*2)

Other To be considered based on an applicable Wind / Seismic Code.

MAWP : PA

MAWP : PBMax. MAWP PA(If PA < PB)

Chamber A

Chamber B

Note(*1) 1.2 times of allowable stress will be used for COMPRESS calculation in accordance with ASME Sec.

VIII Div.1 UG-23 (d) (*2) Ks shall be 1.0. Allowable stress increase shall not be used for structure parts because load reduction is

considered based on Allowable Stress Design in accordance with 2.4.1 of ASCE 7-05. (*3) Wind Load reported in Wind Code in calculation report created by COMPRESS. (*4) Seismic Load reported in Seismic Code in calculation report created by COMPRESS.

User shall note the load reported by COMPRESS is already multiplied by 0.7 according to 2.4.1 of ASCE 7-05.


Page 13 of 79

3.1.2.6 Do not investigate hot shut down Unless this box is checked, COMPRESS analyzes Hot shutdown case in which vessel is depressurized while being subjected to the design temperature and external loading (wind or seismic).

Unless project specification call for, check this check box in accordance with 4.4.1 of JGS 220-210-1-01 that call JPI-7R-35.

3.1.2.7 Numerical integration Since this should be used only for slow CPU computer, select Best in most cases.

3.1.2.8 Do not consider additional ASCE load combinations 7 and 8 Keep the box unchecked so that COMPRESS apply load combination cases 7 and 8 listed in section 2.4.1 of ASCE 7-98, 7-02 and 7-05 during the seismic analysis.

The detail list of combination is as below

Case 7: 0.6D + W + H

Case 8: 0.6D + E + H

Where;

D = Dead load of equipment

W = Wind load on equipment

E = Earthquake load

H = Load due to lateral earth pressure, ground water pressure

F = Load due to fluids with well-defined pressures and maximum heights

Usually these two cases are evaluated in addition to case 5 which is always considered.

Case 5: D + H + F + (W or 0.7E)

The combination cases 7 and 8 specifically apply to the tensile side of the vessel where the uplift forces oppose the vessel weight. Unless there isnt any special requirement, uncheck this option.

3.1.2.9 Lift Lugs Lift lug shall be calculated in accordance with JPI-7S-80. (See 4.4.9)

3.1.2.10 Do not perform Appendix 2 flange rigidity calculations for seismic load case. User shall leave the check box as unchecked so that COMPRESS calculates flange rigidity as per ASME Sec VIII Div 1 Appendix 2, 2-14 and JGS 220-210-


Page 14 of 79

1-01E 5.2.


Page 15 of 79

3.1.3 Testing

3.1.3.1

3.1.3.2

3.1.3.3

3.1.3.4

3.1.3.5

3.1.3.6


Page 16 of 79

3.1.3.1 Hydro/Pneumatic Tests In this box User shall specify the type of testing to be performed on the equipment. User shall keep the check box for shop Test New checked so that COMPRESS considers hydrostatic or pneumatic testing in new shop condition and evaluates the stress level during such testing.

User needs to select the testing position of equipment from Horizontal and Vertical. This option can be selected for vertical equipment only. Unless there is any special requirement, vertical equipment is tested in horizontal position.

The testing pressure shall be selected from the below options;

Hydrotest @ 1.3 vessel design P per UG-99(b)

Hydrotest @ 1.3 vessel MAWP per UG-99(b) (Default selection)Hydrotest @ 1.3 calculated test pressure per UG-99(c)

Pneumatic test @ 1.1 vessel design P per UG-100(b)

Pneumatic test @ 1.1 vessel MAWP per UG-100(b)

Pneumatic test @ 1.1 calc. test pressure per UG-100(b)

User defined test pressure (gauge, top)

Unless there is any specific requirement, apply hydrotest, and hydrotest pressure is calculated based on MAWP i.e., second option Hydrotest @ 1.3 vessel MAWP per UG-99(b) shall be selected.

If it is required to test at field in new erected condition, User shall check the box for Field Test New, Erected. Again User needs to select field test pressure from the above options.

In design mode COMPRESS requires that at least one of Shop test new, horizontal or Field test new, erected be selected.

Keep the box checked for Calculate hydrotest stress so that COMPRESS calculate stress during the testing of equipment. The test liquid static head is added to the hydrotest pressure while calculating stress for each component.

3.1.3.2 Test Temperature Input the test temperature. As per ASME SEC VIII Div 1 UG(99)(h) the metal temperature is recommended to be at least 17oC above the minimum design metal temperature. User shall check the requirement from a project specification for temperature to be maintained during hydrotest. If there is no special requirement, input ambient temperature (20degC).

3.1.3.3 Test liquid specific gravitySpecific gravity is 1 for hydrostatic test.

Specific gravity is 0 for pneumatic test. Note

Even if pneumatic test is selected, specified specific gravity will be used for calculation of static head.


Page 17 of 79

3.1.3.4 Wind Load @ test For evaluation of stress level during a test, it is general design practice that only some percentages of wind loading is applied as it is very unlikely that during hydrotest full wind load will occur. As per JGS 220-210-1-01E stipulation 4.4.3 (1) 33% of wind load shall be considered during a test condition. User shall check the project specification for wind loading percentage requirement.

3.1.3.5 Yield stress allowed @ test Input the percentage of yield stress to be considered as allowable stress. COMPRESS compares the stress induced during testing with this allowable stress and give warning if it exceeds. As per JGS 220-210-1-01E stipulation 4.4.3(2) 90% of yield shall be considered as allowable stress during testing. User shall confirm the requirement from project specification.

3.1.3.6 Impact test temperature Input MDMTof equipment here.

The impact test temperature specified here will be used, only in case Impact Tested was checked in dialog box in each component. (See 4.1)

NoteIt does not mean that impact test shall be conducted at the MDMT.

3.1.4 Nozzles 1 3.1.4.1 Design nozzle for

With this option, user can define how nozzles shall be designed. The options are

When it is checked, MDMT for the compornent will become rated MDMT based on this impact tested temp.

Dialog Box for Each Component

Dialog Box for Set Mode Option Test Tab


Page 18 of 79

as explained below;

(1) Design P, Find nozzle MAWP & MAP: COMPRESS designs nozzles and reinforcements for equipment design conditions and calculates MAWP and MAP for nozzle separately. User shall select this option unless a project specification specifies particular requirement.

(2) Chamber MAWP: COMPRESS designs nozzles and reinforcements for vessel MAWP conditions.

(3) Larger of MAWP or MAP: COMPRESS designs nozzles and reinforcements for vessel MAWP as well as MAP conditions. The worst case is used as a design basis.

(4) Design P only: COMPRESS designs nozzles and reinforcements for equipment design conditions. MAWP and MAP are not calculated for nozzles.

The check box for Design nozzle for chamber MAWP where chamber MAWP ignores ASME B16.5/16.47 flange rating is active only if option (2) and (3) are selected from the above. By default the box shall be unchecked.

3.1.4.1

3.1.4.2

3.1.4.4

3.1.4.5

3.1.4.3

3.1.4.3


Page 19 of 79

3.1.4.2 Rate nozzles for This section is active only if Get pressure rating option is selected for vessel design mode under the calculation tab.

The available options are

(1) Nozzle design P only: Nozzle will be designed for the pressure and temperature of component to which the nozzle is attached.

(2) Find nozzle MAWP: COMPRESS calculates the nozzle MAWP for the available nozzle input.

The default for Find nozzle MAP is unchecked box.

3.1.4.3 Option for Nozzle In most cases, these options should be as shown above. For detailed explanation, see manual or help of COMPRESS.

3.1.4.4 Draw lower groove bevel out This option is provided only to show correct orientation of groove welding in nozzle sketch in output. This option is effective only if the nozzle groove welding is full penetration welding (refer section 3.1.4.5). The direction of groove itself does not affect the strength of full penetration welding. Update All button shall be always clicked after any change in selection to affect the current design.

3.1.4.5 Groove welds are full penetration welding ASME Sec VIII Div 1 UW-16(d) allows nozzle to be welded with fillet welding or partial penetration welding. Check the box if full penetration welding is mandatory for nozzle to shell welding in project specification. Update All button shall be always clicked after any change in selection to affect the current design. This option does not affect the strength calculation.

3.1.5 Nozzle 2 Data in Nozzle 2 tab will be used as default data for nozzle design. If there is any standard drawing for nozzle, to input the data herewill be efficient.

3.1.5.1 Nozzle Design Preference With this option, User can define the default nozzle data when any nozzle is added. The nozzle design dialog box will show these data as default selection, when User uses Detailed Design for nozzle design. User can always change the data for individual nozzle for actual design. It is better to input nozzle data here for easy operation.


Page 20 of 79

3.1.5.2 Quick Nozzle Design Preferences For design of nozzle, Quick Nozzle Design is available (See 4.3) for easy operation. Quick Design procedure allows User to specify a nozzle size and location only. All other detailed information will be selected from data here.

(1) Internal projection is not allowed as per JGS 234-213-5-01E 6.2 (2) Flange shall be Welding neck as per JGS 234-213-5-01E 5.4 (4) (c)

unless otherwise specified.


Page 21 of 79

NoteSchedule A&B are schedule designations for C.S. pipe. Schedule C is a schedule designation for S.S. and non ferrous pipe. A is for the number pipe schedules (10, 20, 40, 80, etc.). B is for the letter pipe schedules (STD, XS, XXS, XXXS, etc.). C is for the number schedules that have s suffix (5s, 10s, 40s, 80, etc.).

3.1.5.1

3.1.5.23.1.5.2(1)

3.1.5.2(2)


Page 22 of 79


Page 23 of 79

3.1.6 Defaults Data in Defaults tab can be selected for each component separately from dialog box for each component. User can, however, use this tab for easy operation.


Page 24 of 79

3.1.7 Platform Defaults Platform Input shall be in accordance with 4.7.2.1, so User does not have to change the values at Platform Defaults Tab.

3.1.8 Options 3.1.8.1 Material thickness option

Keep the option box unchecked so that COMPRESS applies 12.5% fabrication under tolerance to pipe thickness.

User can specify the increment for the used thickness considered by COMPRESS by checking the option User defined thickness increment for plate. Usually keep the box unchecked.

Corrosion weight loss shall be 0% so that calculation for corroded condition should include weight for corroded metal.


Page 25 of 79

3.1.8.2 Calculation option Unless there is any special requirement, uncheck these boxes. See COMPRESS manual for details.

3.1.8.1

3.1.8.2


Page 26 of 79

3.1.9 Welding

3.1.9.1 Butt welds Since deposit weld for butt welding is not common and not preferable, select Tapered per Fig UCS-66.3(3).

This option box will control governing thickness for MDMT determined by UCS-

3.1.9.1

1.1.1.1


Page 27 of 79

66 in accordance with Fig. UCS-66(a) and ASME interpretation VIII-1-95-62.


Page 28 of 79

3.1.9.2 No Weld Preheat below 38 mm This check box is applicable only to P No.1 material. A note (2)(a) of table UCS-56 for P-1 material specifies PWHT is required for welding joint over 32mm through 38mm unless preheat is applied at a min. temperature of 95degC during welding.

Since it is common to conduct preheat in order to avoid PWHT, User shall uncheck this check box unless PWHT is required due to service requirement.

3.1.9.3 Vacuum Ring Welding Defaults Since it is not required to specify details of vacuum ring details JGC documents, User can select any option for the details.

If there is no specific requirement, select Continuous both Sides.

3.2 Set Datum Option

User shall select the vessel orientation for individual equipment either Horizontal or Vertical.

For easy reference and to easily input the various vessel components usually the Datum Seam shall be Bottom seam for vertical vessels and Far right shell seam for horizontal vessels. With this setting User can add the main pressure components from top for vertical vessel and from left side for horizontal vessels.

User can set the Datum Line at offset from the Datum seam by input in Offset from datum seam. There are two cases for this input as below;

If the head forming the Datum Seam with shell is -

a. Elliptical or FD (Flanged and Dished) head; then User shall input the heads straight flange dimension with negative sign as offset distance for Datum line from datum seam. This will match the datum line with TL and User


Page 29 of 79

can directly add other components with reference to datum line with same distance from TL as given in datasheet.


Page 30 of 79

b. Hemispherical head then User shall input 0.

4. MAIN OPTION MENU 4.1 How to Create New Vessel

When creating a new vessel, Construct all head, shell, and transitions (pressure envelope) first. Start with the top or left head, design from the top down for towers , left to right for horizontal vessels.

See 2.1 for general sequence and 4.2 for detailed instruction for each kind of component.

Each component can be created from palette or component menu.

Component Input Order Vertical Vessel (Sample) Top Head > Cylinder x4 > Bottom Head

Horizontal Vessel (Sample)Left Head > Cylinder x4 > Right Head

Straight Flange Length

Bottom Shell Seam DatumSBottom TL Datum Line


Page 31 of 79

4.2 Component Option 4.2.1 Cylinder

Cylinder can be added from cylinder in component menu or icon ( ) in palette.

Input of cylinder requires two dialog boxes.1st window is for general data. 2ndwindow is for dimensional data.

4.2.1.1

4.2.1.2 4.2.1.3


Page 32 of 79

4.2.1.1 General Information for Cylinder User shall refer to data sheet for these data except corrosion allowance.

In accordance with 5.6.1 of JGS 220-210-1-01, mill under tolerance shall be excluded from thickness of calculation. However COMPRESS does not haveafield for mill under tolerance. User shall add mill under tolerance to plate material in accordance with UG-16(c), i.e. smaller of 0.01in. (0.25mm) or 6% of thicknessas follows:

Inner CA = CA specified in Data Sheet

Outer CA = Mill Under Tolerance

4.2.1.2 Test Temp. This data is linked with data in Test tab of Set Mode Option (See 3.1.3.2). User should not change test temperature at dialog box for each component instead of set mode option.

4.2.1.3 Other Options (1) Impact Tested

If the specified MDMT is colder than material rated MDMT without impact test, User will have warning message. User should note that the warning will not be shown in report of calculation. Depending on the circumstances, MDMT may be reduced by a number of variables such as

4.2.1.4

4.2.9


Page 33 of 79

the application of PWHT, impact testing the material and even changing the applied stress ratio. It is the designer's responsibility to arrive at the desired MDMT by taking action that is appropriate to the circumstances.

(2) Material Normalized It will be used for curve selection of Fig. UCS-66. User shall note that COMPRESS will not check the box of Material Normalized automatically, even if code requires normalized, e.g. 40t of SA516-70 or UCS-79 for fiber elongation.

(3) Product to Fine Grain Practice It will be used for curve selection of Fig. UCS-66. User do not have to check unless SA-216 is selected as a material.


Page 34 of 79

(4) PWHT performed User shall check it, if service condition or code requires PWHT. If code requires PWHT and it was left unchecked, User will have warning message and COMPRESS will check the box. PWHT will be usually conducted for whole of vessel. When only some parts of vessel were specified for PWHT, COMPRESS will suggest conducting PWHT to whole of vessel. User can agree or disagree with the suggestion.

(5) Maximize MDMT/No MAWP If it is not required to calculate MAWP, it should be checked. This option will allow User to use tr as thickness based on design pressure instead of MAWP, when it calculates coincident ratio per UCS-66(b).

(6) Find coincident pres. for MDMT Leave this option unchecked.

This option determines the pressure at which the MDMT input in the dialog is exempt from impact testing. To use it, check the option and advance to the next dialog and return to the previous dialog. When return, User can find the maximum pressure that can be specified without having to impact test the material in field for Internal Pressure. This switch will be automatically turned off.

4.2.1.4 Dimensions User shall inputcylinder dimensions as described below.

Step 1 Input TLTL 2 x SF as a cylinder length, and confirm governing load. User shall input it as described below. If packing will be installed into the vessel, make sure 4.4.4 before completion of cylinder arrangement.

TLTL = Length between TL SF = Length of Straight

SFSF

TLTL

-2 x

SF

Load Check

Confirm governing load at the bottom of the cylinder. (See Thickness )

Wind or Seismic or Weight d

Internal or External

Go to Step End (Appropriate Cylinder Length

Input)


Page 35 of 79

Step 2

Rem

aini

ng C

ylin

der

Internal or External Pressure

N X

150

0

Insert required number of 1500mm length cylinders so that bottom of remaining cylinder shall be governed by internal or external pressure. (See Thickness Summary)

Note:This rule using 1500mm pitch calculation is in accordance with minimum calculation span of EDS-II. When this calculation span causes impractical cascade cylinder plate with kinds of thickness, proper increment may be asked by lead engineer.Wind or Seismic

Wind or Seismic

Wind or Seismic

SFSF

Load Check

1500mm Length

Remaining Cylinder

Governing Load


Page 36 of 79

4.2.2 Transition Transition (Conical Shell) can be added from Transition in component menu or icon ( ) in palette.

Transition component requires input of 2 dialog boxes is as same as the input for cylinder, i.e. 1st one is for general and 2nd one is for dimensions.

Input procedure for general data in 1st dialog box is same with procedure for cylinder (See 4.2.1) User shall note special procedure for CA. (See 4.2.1.1)

For input of dimensions, refer to below.

4.2.2.1 4.2.2.2


Page 37 of 79

4.2.2.1 Flare and Knuckle These check boxes should be unchecked to avoid additional forming for the end of conical shell, unless following cases;

(1) There is special requirement (2) Half apex exceed 30degree (3) The skirt is attached to the large end of the conical shell.

(See below) In the latter case, knuckle should be provided.

4.2.2.2 Use Design P & Design Pe If it is not required to calculate MAWP, it should be checked. This option will allow User to use design pressure for calculation of ASME Sec.VIII Div.1 Appendix 1-5 and 1-8.

4.2.3 Ellipsoidal Head Ellipsoidal Head can be added from Ellipsoidal Head in component menu or icon ( ) in palette.

Ellipsoidal Head component requires input of 2 dialog boxes, i.e. 1st one is for general and 2nd one is for dimensions.

Input procedure for general data in 1st dialog box is as same as the procedure for cylinder (See 4.2.1)


Skirt

Transition

Knuckle


Page 38 of 79

4.2.3.1 Minimum and Nominal Thickness Beside fields for minimum head thickness and Nom. Str. Flange Thickness, COMPRESS will show minimum required thickness for each value. User shall specify Minimum Head Thickness as calculated by COMPRESS and Nominal Str. Flange Thickness as calculated by COMPRESS with increment by 1mm.

User shall note that COMPRESS will not consider forming loss fora calculation using minimum required thickness. User shall compensate a weight difference between minimum thickness and nominal thickness. The difference of weight shall be added as a vertical load. (See 4.7.2.3)

4.2.3.2 Straight Flange Length Straight flange length shall be (3x th) but not exceed 38mm in accordance with Fig. UW-13.1, where th is nominal head thickness.

4.2.3.3 Code Case 2260 If there is any special requirement for the use of code case, User shall check this option.

4.2.3.2

4.2.3.1

4.2.3.3


Page 39 of 79

4.2.4 F & D Head As noted in 5.1 of JGS 220-210-1-01, 2:1 ellipsoidal head is standard type of head. But if it is specified, F & D head (Flanged Dished Head / Torispherical Head) can be used.

F & D Head can be added from F & D Head in component menu or icon ( )in palette.

F & D Head component requires input of 2 dialog boxes, i.e. 1st one is for general and 2nd one is for dimensions.

Input procedure for general data in 1st dialog box is as same as the procedure for cylinder (See 4.2.1)


4.2.4.1 Crown and Knuckle Inner Radius In most cases, 10% dished head should be used. For the default of COMPRESS, see COMPRESS manual.

Crown Inner Radius = 0.1 ID of shell

Knuckle Inner Radius = 0.194 ID of shell

4.2.4.2 Other dimensions See explanation of ellipsoidal head ( 4.2.3 ).

4.2.4.1

4.2.4.2


Page 40 of 79

Documents

Compress Manual 2.4