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MTH PUMPS
M50 • L50 SeriesMultistage Regenerative Turbine Pumps
M50
• L5
0 SE
RIE
S PU
MPS
• Capacities to 40 GPM • Heads to 2300 Feet • Single or Multi-stage Units (up to 5 stages) • Vertical Close Coupled • Horizontal Close Coupled • Horizontal Flexible Coupled
Page M-1
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
Vertical base mount and horizontal pedestal mounted multi-stage regenerative turbine pumps represent the most economical high performance alternative for low flow (2 to 38 GPM) applications involving moderate to high pressures (heads to 2300 feet). By combining the latest concepts in hydraulic turbine pump design with precision computer controlled manufacturing, M50 Series pumps deliver high efficiency operation even at low NPSH. Costs are controlled by efficient manufacturing processes, use of standard motors, and highly optimized pump designs. Maintenance costs are kept to a minimum by combining an easily serviceable design with the use of high quality components to provide long life. Water Passage Design MTH masters one of the most critical design considerations of regenerative turbine pumps - the shaping of water passageways to achieve maximum capacity and pressure while minimizing horsepower requirements. By optimizing water
passageway cross-sectional profiles for each impeller, MTH improves both efficiency and pressure in the M50 Series, and exceeds the standards realized by previous techniques. Impeller Profile One of the most notable improvements in regenerative turbine pump technology, incorporated in M50 Series pumps, involves the ability to determine the optimum impeller width and blade length. These factors have a significant effect on the required horsepower versus pressure curve for regenerative turbine pumps. By optimizing these for each pump, peak efficiency is improved and “off peak” horsepower requirements are reduced as well. Impeller Blades After the most favorable impeller profile has been determined for a particular water passageway cross-section, MTH calculates the number of blades needed to maximize the performance of that pump. The blade design in M50 Series pumps increases both efficiency and design pressure without incurring the manufacturing difficulties associated
with producing contoured blade impellers. State-of-the-art computer controlled machines simplify manufacturing of the various MTH impellers utilized in the M50 Series. The result is a high performance pump providing efficiency characteristics exceeding those of much more expensive units. NPSH Requirements M50 Series regenerative turbine pumps meet low net positive suction head (NPSH) requirements without efficiency loss. This is achieved by keeping the inlet fluid velocity low and then gently accelerating to passageway velocities. Special ramps are responsible for this gentle fluid entry into the impeller blades and account for the high inlet efficiency of the M50 Series pumps. Low NPSH Requirements
MTH PUMPS
M50 • L50 SeriesMultistage Regenerative Turbine Pumps
M50 • L50 SER
IES PUM
PS
Page M-2
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
L50 Series regenerative turbine pumps have exceptionally low NPSH requirements, making them ideally suited for applications where very little inlet head is available. This reduced NPSHR provided by the
L50 Series is obtained by using a first stage centrifugal style impeller with inlet flow paths shaped to maintain a constant fluid velocity. This reduces entry losses to the impeller as well as maintaining efficiency. A multi-vane diffuser is used in conjunction with the centrifugal impeller for
balancing radial loads and extracting the maximum pressure from the first stage. Pressure and flow produced by the NPSH inducer assures that the succeeding stages are adequately fed.
STANDARD MATERIALS LIMITATIONSDischarge Pressure 1000 PSISeal Pressure* 200 PSISuction Pressure (Min.) 26” Hg Vac.Speed 3600 RPMTemperatureStandard Construction -20°FCeramic Seal Seat - Water 230°FSilicon Carbide Seal Seat & External Seal Flush 250°FHorsepowerC3 - P3 1/3 to 3 HPC30 - P30 5 to 30 HP*Suction Pressure Plus a Percentage ofDifferential Pressure
PARTBRONZEFITTED ALL IRON ALL BRONZE
STAINLESS STEEL
Inlet Cover Cast IronASTM A48
Cast IronASTM A48
BronzeASTM B62 Stainless Steel
Outlet Cover Cast IronASTM A48
Cast IronASTM A48
BronzeASTM B62 Stainless Steel
Impeller BronzeASTM B62
Carbon Steel12L14
BronzeASTM B62 Stainless
Shaft Stainless SteelAISI 416
Stainless SteelAISI 416
Stainless SteelAISI 316 Stainless Steel
“O” Rings Buna N Buna N Buna N VitonSeals Buna/Ceramic Buna/Ni-Resist Buna/Ceramic Viton/Ceramic
M50 • L50 SERIES
The contractor shall furnish (and install as shown on the plans) an MTH (M50) (L50) Series (horizontal) (vertical base mount) close coupled (horizontal pedistal mounted) regenerative turbine type pump model _____ size ____ of (BRONZE FITTED) (ALL IRON) (ALL BRONZE) (316 STAINLESS STEEL) construction. Each pump shall have a capacity of ___GPM when operating at a total head of ___feet. Suction pressure will be ___feet with a liquid temperature of ___degrees F.
The pump is to be furnished with a me-chanical seal with stainless steel metal parts, (Buna) (EPR) (Teflon) (Viton) elastomers, (ceramic) (ni-resist) (silicon carbide) (tungsten carbide) seat and carbon washer. Pump will have shaft sleeve or stainless steel shaft which will prevent pumped fluid from contacting motor shaft.
The L50 Series pump shall be low NPSHR inducer style design with a cen-trifugal radial vane design impeller and a multi-vane diffuser for balancing radial loads. The pump shall be vertically split
design with replaceable external chan-nel rings that have water passageways accurately machined into each ring. The suction and discharge will have (NPT) (SAE) (BSP) (ISO) threads located in the top vertical position for self-venting and shall be cast separately from one another. The impeller(s) shall be hy-draulically self-centering and no external adjustment shall be necessary.
The close coupled pump shall be mount-ed to a standard NEMA __HP __phase __Hertz __volt __RPM (horizontal) (ver-tical), (open drip proof) (totally enclosed) (explosion proof) motor. Each pump shall be tested at the specified capacity and head prior to shipment. The motor shall be sized to prevent overloading at the highest head condition listed in the specifications.
The pedistal mounted pump shall be mounted on a bearing pedestal with sealed, grease lubricated ball bearings having a two year minimum design life under a maximum pump differential pressure of 1000 PSI, and the shaft shall be of a stainless steel material. Pump and motor shall be mounted on a com-
mon steel baseplate, flexible coupled with coupling guard to a standard hor-izontal NEMA __HP __phase __Hertz __volt __RPM (open drip proof) (totally enclosed) (explosion proof) motor. Cou-pling alignment shall be checked after installation. Each pump shall be tested at the specified capacity and head prior to shipment. The motor shall be sized to prevent overloading at the highest head condition listed in the specifications.
Engineering Specifications
M50 • L50 SERIES
Performance Curves
3450 RPM
3450 RPM
M50 • L50 Series
M50 • L50 Series
M50
• L5
0 SE
RIE
S PU
MPS
Page M-3
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
NOTES Usable Operating Range Refer to Factory for Operation in this RangeRefer to Individual Curves for Horsepower and NPSH Requirements
J L M P
U.S. GALLONS PER MINUTE
10 14 18 22 26 30 34 38 42
HE
AD
IN F
EE
T
0
400
800
1200
1600
2000
2400
R
B C D G
U.S. GALLONS PER MINUTE
0 2 4 6 8 10 12 14 16
HE
AD
IN F
EE
T
0
400
800
1200
1600
2000
2400
E J
L
M50 • L50 SERIES
Performance Curves
2880 RPM
2880 RPM
M50 • L50 Series
M50 • L50 Series
M50 • L50 SER
IES PUM
PS
Page M-4
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE
8 12 14 16 18 20 22 24 26 24 28 30 32 34
HE
AD
IN F
EE
T
0
200
400
600
800
1000
1200
1400
1600
1800
J L M P R
U.S. GALLONS PER MINUTE
0 1 2 3 4 5 6 7 8 9 10 11 12
HE
AD
IN F
EE
T
0
200
400
600
800
1000
1200
1400
1600
1800
B C D E G J
L
NOTES Usable Operating Range Refer to Factory for Operation in this RangeRefer to Individual Curves for Horsepower and NPSH Requirements
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-5
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
BH
P
0
1
2
3
4
5
M51B • L51B
M52B • L52B
M53B • L53B
M50B NPSHRL50B NPSHR
M55B • L55B
M54B • L54B
M51B • L51B*
M55B • L55B*
M54B • L54B*
M52B • L52B*
M53B • L53B*
1 2 3 4 5
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .43 horsepower for L50B Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
B B
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-6
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
BH
P
0.0
0.5
1.0
1.5
2.0
2.5
3.0
1 3
M51B • L51B
M52B • L52B
M53B • L53B
M50B NPSHR
L50B NPSHR
M55B • L55B
M54B • L54B
M51B • L51B*
M55B • L55B*
M54B • L54B*
M52B • L52B*
M53B • L53B*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .26 horsepower for L50B Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
B B
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-7
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
BH
P
0
1
2
3
4
5
M51C • L51C*
M52C • L52C*
M55C • L55C*M54C • L54C*
M51C • L51C
M52C • L52C
M53C • L53C
M55C • L55CM54C • L54C
L50C NPSHR
M50C NPSHR
M53C • L53C*
1 2 3 4 5 6
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .45 horsepower for L50C Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
C C
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-8
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 1 2 3 4 5 6
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
M51C • L51C
M52C • L52C
M53C • L53C
M51C • L51C*
M53C • L53C*
M54C • L54C*
M55C • L55C
L50C NPSHR
M52C • L52C*
M55C • L55C*
M50C NPSHR
M54C • L54C
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .27 horsepower for L50C Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
C C
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-9
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
M54D • L54D* M55D • L55D*
U.S. GALLONS PER MINUTE0 1 2 3 4 5
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
1
2
3
4
5
6
M51D • L51D*
M52D • L52D*
M53D • L53D*
M51D • L51D
M52D • L52D
M53D • L53D M55D • L55D
M50D NPSHR
L50D NPSHR
M54D • L54D
6 7 8
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .49 horsepower for L50D Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
D D
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-10
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 1 2 3 4 5 6 7
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0
1
2
3
4
5
6
M51D • L51D*
M52D • L52D*
M53D • L53D*
M54D • L54D*
M55D • L55D*
L50D NPSHR
M51D • L51D
M52D • L52D
M53D • L53D
M55D • L55DM54D • L54D
M50D NPSHR
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .29 horsepower for L50D Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
D D
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-11
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
2
4
6
8
10
M51E • L51E*
M52E • L52E*
M55E • L55E*
M51E • L51E
M54E • L54E
M52E • L52E
M53E • L53E* M54E • L54E*
M55E • L55EM53E • L53E
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .57 horsepower for L50E Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
E E
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-12
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0
1
2
3
4
5
6
7
8
9
10
M51E • L51E
M53E • L53E
M52E • L52E*
M53E • L53E*
M54E • L54E*
M52E • L52E
M55E • L55E
M50E NPSHR
L50E NPSHR
M55E • L55E
M51E • L51E*
M54E • L54E
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .33 horsepower for L50E Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
E E
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-13
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12 14
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
2
4
6
8
10
12
14
16
18
M51G • L51G*
M52G • L52G*
M53G • L53G*
M54G • L54G* M55G • L55G*
M53G • L53G
M51G • L51G
M52G • L52G M55G • L55GM54G • L54G
L50G NPSHR
M50G NPSHR
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .62 horsepower for L50G Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
G G
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-14
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0
1
2
3
4
5
6
7
8
9
10M55G • L55G*
M53G • L53G
M51G • L51G
M54G • L54G M55G • L55G
M50G NPSHR
L50G NPSHR
M53G • L53G* M54G • L54G*
M52G • L52G*
M51G • L51G*
M52G • L52G
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .35 horsepower for L50G Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
G G
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-15
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 8 10 12 14 16 18
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
4 6
M51J • L51J
M52J • L52J
M53J • L53J M55J • L55J
M51J • L51J*
M52J • L52J*
M53J • L53J*
M55J • L55J*
M50J NPSHR
M54J • L54J*
M54J • L54J
L50J NPSHR
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .70 horsepower for L50J Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
J J
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-16
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12 14
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0
2
4
6
8
10
12
14
M51J • L51J*
M51J • L51J
M52J • L52J
M53J • L53J M55J • L55J
M50J NPSHR
L50J NPSHR
M53J • L53J*
M55J • L55J*
M54J • L54J
M54J • L54J*
M52J • L52J*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .38 horsepower for L50J Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
J J
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-17
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE
0 4 8 12 16 20 24
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
30
M55L • L55L
M51L • L51L*
M52L • L52L*
M55L • L55L*
M52L • L52L
M50L NPSHR
M54L • L54L*
L50L NPSHR
M51L • L51L
M54L • L54LM53L • L53L
M53L • L53L*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .81 horsepower for L50L Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
L L
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-18
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12 14 16 18 20
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
BH
P
0
5
10
15
20
M52L • L52L
M53L • L53L M54L • L54L M55L • L55L
M50L NPSHR
L50L NPSHR
M51L • L51L*
M52L • L52L*
M53L • L53L*
M54L • L54L* M55L • L55L*
M51L • L51L
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .43 horsepower for L50L Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
L L
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-19
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 4 8 12 16 20 24 28
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
30
35
M52M • L52MM55M • L55MM53M • L53M
M51M • L51M*
M52M • L52M*
M55M • L55M*
M50M NPSHR
M54M • L54M
M54M • L54M*
M51M • L51M
L50M NPSHR
M53M • L53M*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .86 horsepower for L50M Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
M M
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-20
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 2 4 6 8 10 12 14 16 18 20 22
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
M51M • L51M
M52M • L52M
M54M • L54M M55M • L55MM53M • L53M
M50M NPSHR
M51M • L51M*
M52M • L52M*
M53M • L53M* M54M • L54M* M55M • L55M*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .46 horsepower for L50M Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
M M
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-21
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 10 15 20 25 30 35
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
30
35
40
M51P • L51P
M53P • L53P M54P • L54P
M52P • L52P
M50P NPSHR
M55P • L55P
M51P • L51P*
M52P • L52P*
M54P • L54P* M55P • L55P*
L50P NPSHR
M53P • L53P*
5
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .97 horsepower for L50P Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
P P
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-22
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 5 10 15 20 25 30
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
M53P • L53P*
M51P • L51P
M53P • L53P
M52P • L52P
M50P NPSHR
L50P NPSHR
M54P • L54P M55P • L55P
M51P • L51P*
M55P • L55P*
M52P • L52P*
M54P • L54P*
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .53 horsepower for L50P Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
P P
M50 • L50 SERIES
Performance Curves
3450 RPMM50 • L50
M50
• L5
0 SE
RIE
S PU
MPS
Page M-23
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 5 10 15 20 25 30 35 40 45
HE
AD
IN F
EE
T
0
500
1000
1500
2000
2500
NP
SH
IN F
EE
T
0
5
10
15
20
BH
P
0
10
20
30
40
M51R • L51R*
M52R • L52R*
M53R • L53R* M54R • L54R* M55R • L55R*
M52R • L52R M53R • L53R M54R • L54R M55R • L55R
M51R • L51R
L50R NPSHR
M50R NPSHR
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add 1.08 horsepower for L50R Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
R R
M50 • L50 SERIES
Performance Curves
2880 RPMM50 • L50
M50 • L50 SER
IES PUM
PS
Page M-24
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
U.S. GALLONS PER MINUTE0 5 10 15 20 25 30 35 40
HE
AD
IN F
EE
T
0
500
1000
1500
2000
NP
SH
IN F
EE
T
0
5
10
15
BH
P
0
5
10
15
20
25
30
M51R • L51R*
M53R • L53R*M54R • L54R* M55R • L55R*
M51R • L51R
M52R • L52R
M53R • L53R M55R • L55R
M50R NPSHR
L50R NPSHR
M52R • L52R*
M54R • L54R
NOTES Recommended Operating Range Refer to Factory for Operation in this Range*Add .61 horsepower for L50R Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only
R R
M50 • L50 SERIES
M50
• L5
0 SE
RIE
S PU
MPS
Dimensions
Page M-25
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.*See motor price sheet for C-AH dimension (varies depending on motor enclosure)Model M52 shown in Multistage Dimensions. Model M51 shown in Single Stage Dimensions.
1 1/4 INLET
1 DISCHARGE
4 5/8 4 5/8 1 1/8
3 7/81 1/2
10
Feet Slotted for Two 1/2-13 Cap Screws
5
8 1/42
7/8
4 1/4
5 1/4
4
1 1/4 INLET
1 1/4DISCHARGES
1 3/8
4 5/84 5/8 5 4 1/41/8 5
10Feet Slotted for Three 1/2-13 Cap Screws
P
C-AH
C-AH
9 1/42
G
M50 PUMPS WITHOUT INDUCERALL MODEL M51 MODEL M52 MODEL M53 MODEL M54 MODEL M55
FRAME C-AH G S P S P S P S P S P56C 13 1 3/16
SEE BELOW OR REFER
TO T51 SERIES
7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16143T-145T 13 1 3/16 7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16182T-184T 14 1/2 1 3/16 7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16213T-215T 17 1 3/16 7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16254T-256T 21 1/2 1 3/16 7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16284TS-286TS 23 1/2 1 3/16 7 1/2 10 1/16 10 12 9/16 12 1/2 15 1/16 15 17 9/16
L50 PUMPS WITH INDUCERALL MODEL L51 MODEL L52 MODEL L53 MODEL L54 MODEL L55
FRAME C-AH G S P S P S P S P S P56C 13 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16143T-145T 13 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16182T-184T 14 1/2 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16213T-215T 17 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16254T-256T 21 1/2 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16284TS-286TS 23 1/2 2 1/4 5 15/16 9 9/16 8 7/16 12 1/16 10 15/16 14 9/16 13 7/16 17 1/16 15 15/16 19 9/16
M50 • L50 SERIES
M50 • L50 SER
IES PUM
PS
Dimensions
Page M-26
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
1 1/4 NPTDischarge
M50 SERIES BASE MOUNTED CLOSE COUPLED WITH C3 MOTOR (WITHOUT INDUCER)
L50 SERIES BASE MOUNTED CLOSE COUPLED WITH C3 MOTOR (WITH INDUCER)ALL L50 MODELS MODEL L51 MODEL L52 MODEL L53 MODEL L54 MODEL L55
FRAME 2F E H G S P L S P L S P L S P L S P L56C 3 2 7/16 5/16-18 2 1/4 5 15/16 12 3/4 28 8 7/16 15 1/4 30 10 15/16 17 3/4 32 13 7/16 20 1/4 35 15 15/16 22 3/4 40
143TC 4 2 3/4 5/16-18 2 1/4 5 15/16 12 15/16 28 8 7/16 15 7/16 30 10 15/16 17 15/16 32 13 7/16 20 7/16 35 15 15/16 22 15/16 40145TC 5 2 3/4 5/16-18 2 1/4 5 15/16 12 15/16 28 8 7/16 15 7/16 30 10 15/16 17 15/16 32 13 7/16 20 7/16 35 15 15/16 22 15/16 40182TC 4 1/2 3 3/4 3/8-16 2 1/4 5 15/16 13 11/16 30 8 7/16 16 3/16 32 10 15/16 18 11/16 35 13 7/16 21 3/16 40 15 15/16 23 11/16 40
ALL M50 MODELS MODEL M51 MODEL M52 MODEL M53 MODEL M54 MODEL M55FRAME 2F E H G S P L S P L S P L S P L S P L
56C 3 2 7/16 5/16-18 1 3/16
REFER TOT51 SERIES
7 1/2 13 5/16 28 10 15 13/16 32 12 1/2 18 5/16 35 15 20 13/16 40143TC 4 2 3/4 5/16-18 1 3/16 7 1/2 13 1/2 28 10 16 32 12 1/2 18 1/2 35 15 21 40145TC 5 2 3/4 5/16-18 1 3/16 7 1/2 13 1/2 28 10 16 32 12 1/2 18 1/2 35 15 21 40182TC 4 1/2 3 3/4 3/8-16 1 3/16 7 1/2 14 1/4 30 10 16 3/4 32 12 1/2 19 1/4 35 15 21 3/4 40
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.*See motor price sheet for C-AH dimension (varies depending on motor enclosure)
9 1/2
5 1/4
1 1/2
1 Four 17/32 Dia. Foundation Holes 1
1
12
1
Four H Taps
E
E
L
2F
4 1/4G
1 1/4 NPT InletC-AH*
2 1/2
S
P
Two 1/2-13 Taps
4 1/4
4 1/4
M50 • L50 SERIES
M50
• L5
0 SE
RIE
S PU
MPS
Dimensions
Page M-27
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
M50 SERIES BASE MOUNTED CLOSE COUPLED WITH C30 MOTOR (WITHOUT INDUCER)
L50 SERIES BASE MOUNTED CLOSE COUPLED WITH C30 MOTOR (WITH INDUCER)
ALL M50 MODELS MODEL M52 MODEL M53 MODEL M54 MODEL M55FRAME C-AH 2F E H G D W S P L S P L S P L S P L
184 13 3/4 5 1/2 3 3/4 3/8-16 1 3/16 5 1/4 12 7 1/2 13 1/2 28 10 16 30 12 1/2 18 1/2 32 15 21 35213 15 1/2 5 1/2 4 1/4 3/8-16 1 3/16 5 1/4 12 7 1/2 14 1/4 32 10 16 3/4 35 12 1/2 19 1/4 40 15 21 3/4 40215 17 7 4 1/4 3/8-16 1 3/16 5 1/4 12 7 1/2 14 1/4 32 10 16 3/4 35 12 1/2 19 1/4 40 15 21 3/4 40254 19 3/4 8 1/4 5 1/2-13 1 3/16 6 1/4 15 7 1/2 15 35 10 17 1/2 40 12 1/2 20 40 15 22 1/2 45256 21 1/2 10 5 1/2-13 1 3/16 6 1/4 15 7 1/2 15 35 10 17 1/2 40 12 1/2 20 40 15 22 1/2 45284 22 9 1/2 5 1/2 1/2-13 1 3/16 7 15 7 1/2 15 1/2 40 10 18 40 12 1/2 20 1/2 45 15 23 45286 23 1/2 11 5 1/2 1/2-13 1 3/16 7 15 7 1/2 15 1/2 40 10 18 40 12 1/2 20 1/2 45 15 23 45
ALL L50 MODELS MODEL L52 MODEL L53 MODEL L54 MODEL L55FRAME C-AH 2F E H G D W S P L S P L S P L S P L
184 13 3/4 5 1/2 3 3/4 3/8-16 2 1/4 5 1/4 12 8 7/16 15 7/16 30 10 15/16 17 15/16 32 13 7/16 20 7/16 35 15 15/16 22 15/16 40213 15 1/2 5 1/2 4 1/4 3/8-16 2 1/4 5 1/4 12 8 7/16 16 3/16 35 10 15/16 18 11/16 35 13 7/16 21 3/16 40 15 15/16 23 11/16 40215 17 7 4 1/4 3/8-16 2 1/4 5 1/4 12 8 7/16 16 3/16 35 10 15/16 18 11/16 35 13 7/16 21 3/16 40 15 15/16 23 11/16 40254 19 3/4 8 1/4 5 1/2-13 2 1/4 6 1/4 15 8 7/16 16 15/16 40 10 15/16 19 7/16 40 13 7/16 21 15/16 45 15 15/16 24 7/16 45256 21 1/2 10 5 1/2-13 2 1/4 6 1/4 15 8 7/16 16 15/16 40 10 15/16 19 7/16 40 13 7/16 21 15/16 45 15 15/16 24 7/16 45284 22 9 1/2 5 1/2 1/2-13 2 1/4 7 15 8 7/16 17 7/16 40 10 15/16 19 15/16 45 13 7/16 22 7/16 45 15 15/16 24 15/16 50286 23 1/2 11 5 1/2 1/2-13 2 1/4 7 15 8 7/16 17 7/16 40 10 15/16 19 15/16 45 13 7/16 22 7/16 45 15 15/16 24 15/16 50
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.*See motor price sheet for C-AH dimension (varies depending on motor enclosure)
D
1 1/2
1 Four 17/32 Dia. Foundation Holes 1
1
W
1Four H TapsTwo 1/2-13 Taps
E
E
4 1/4
4 1/4
L
2F
4 1/2GC-AH
1 1/4 NPTDischarge
2 1/2
S
P
1 1/4 NPTInlet
4 1/4
M50 • L50 SERIES
M50 • L50 SER
IES PUM
PS
Dimensions
Page M-28
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
M50 • L50 SERIES PUMP END ONLY WITH P3 BEARING PEDESTAL
M50 • L50 SERIES PUMP END ONLY WITH P30 BEARING PEDESTAL
PUMPS WITHOUT INDUCER PUMPS WITH INDUCERDIM. M52 M53 M54 M55 L51 L52 L53 L54 L55
S 7 1/2 10 12 1/2 15 5 15/16 8 7/16 10 15/16 13 7/16 15 15/16P 12 7/16 14 15/16 17 7/16 19 15/16 11 7/8 14 3/8 16 7/8 19 3/8 21 7/8R 5 15/16 5 15/16 5 15/16 5 15/16 6 15/16 6 15/16 6 15/16 6 15/16 6 15/16
PUMPS WITHOUT INDUCER PUMPS WITH INDUCERDIM. M52 M53 M54 M55 L52 L53 L54 L55
S 7 1/2 10 12 1/2 15 8 7/16 10 15/16 13 7/16 15 15/16P 13 3/8 15 7/8 18 3/8 20 7/8 15 5/16 17 13/16 20 5/16 22 13/16R 9 1/16 9 1/16 9 1/16 9 1/16 10 1/8 10 1/8 10 1/8 10 1/8
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.
1 9/16
1 5/16
3
5 1/2 P
S1 1/4 NPTDischarge
1 1/4 NPTInlet
Ø1 1/8 Max.Ø3/4 3/16 Sq. Key
Feet Slotted forTwo 3/8 Cap Screws 4 1/44 1/4
Feet Slotted forTwo 1/2 Cap Screws
5 1/4
9 1/2
11
1/2
2
1 3/4
R
10 1/2
5 1/4 P
S
1 1/4 NPTDischarge
1 1/4 NPT Inlet
Ø1 5/8Max.
Ø1 1/8 Dia.
Feet Slotted forTwo 1/2 Cap Screws
1/2
2R
3/16Sq.Key
4 1/44 1/4
Feet Slotted forTwo 1/2 Cap Screws
5 1/4
9 1/2
11
10 1/2
M50 • L50 SERIES
M50
• L5
0 SE
RIE
S PU
MPS
Dimensions
Page M-29
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
M50 SERIES BASE MOUNTED ASSEMBLY WITH P3 BEARING FRAME (WITHOUT INDUCER)
L50 SERIES BASE MOUNTED ASSEMBLY WITH P3 BEARING FRAME (WITH INDUCER)
ALL M50 MODELS MODEL M51 MODEL M52 MODEL M53 MODEL M54 MODEL M55FRAME CPLG 2F E H K S P L S P L S P L S P L S P L
56 3J 3 2 7/16 5/16-18 5/8
REFER TOT51 SERIES
7 1/2 12 7/16 32 10 14 15/16 35 12 1/2 17 7/16 38 15 19 15/16 40143T 4J 4 2 3/4 5/16-18 5/8 7 1/2 12 7/16 35 10 14 15/16 35 12 1/2 17 7/16 38 15 19 15/16 40145T 4J 5 2 3/4 5/16-18 5/8 7 1/2 12 7/16 35 10 14 15/16 35 12 1/2 17 7/16 38 15 19 15/16 40182T 5J 4 1/2 3 3/4 3/8-16 3/4 7 1/2 12 7/16 35 10 14 15/16 38 12 1/2 17 7/16 40 15 19 15/16 45184T 5J 5 1/2 3 3/4 3/8-16 3/4 7 1/2 12 7/16 35 10 14 15/16 38 12 1/2 17 7/16 40 15 19 15/16 45
ALL L50 MODELS MODEL L51 MODEL L52 MODEL L53 MODEL L54 MODEL L55FRAME CPLG 2F E H K S P L S P L S P L S P L S P L
56 3J 3 2 7/16 5/16-18 5/8 5 15/16 11 7/8 32 8 7/16 14 3/8 35 10 15/16 16 7/8 38 13 7/16 19 3/8 40 15 15/16 21 7/8 45143T 4J 4 2 3/4 5/16-18 5/8 5 15/16 11 7/8 32 8 7/16 14 3/8 35 10 15/16 16 7/8 38 13 7/16 19 3/8 40 15 15/16 21 7/8 45145T 4J 5 2 3/4 5/16-18 5/8 5 15/16 11 7/8 32 8 7/16 14 3/8 35 10 15/16 16 7/8 38 13 7/16 19 3/8 40 15 15/16 21 7/8 45182T 5J 4 1/2 3 3/4 3/8-16 3/4 5 15/16 11 7/8 35 8 7/16 14 3/8 38 10 15/16 16 7/8 40 13 7/16 19 3/8 45 15 15/16 21 7/8 45184T 5J 5 1/2 3 3/4 3/8-16 3/4 5 15/16 11 7/8 35 8 7/16 14 3/8 38 10 15/16 16 7/8 40 13 7/16 19 3/8 45 15 15/16 21 7/8 45
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.*See motor price sheet for C dimension (varies depending on motor enclosure)
1 Four 17/32 Dia. Foundation HolesTwo 3/8-16 Taps
1
1
12
1Four H Taps
Two 1/2-13 Taps
E
E 2 7/16
2 7/164 1/4
4 1/4
L
2F
4 1/2K
1 1/4 NPTInlet
C*
Ø3/4
1 1/4 NPTDischarge
9 1/2
5 1/4
1 1/2
3/16 Key
3 2 1/2
S
P
M50 • L50 SERIES
M50 • L50 SER
IES PUM
PS
Dimensions
Page M-30
© Copyright 2011 MTH Tool Company, Inc. Dated May 2011
M50 SERIES BASE MOUNTED ASSEMBLY WITH P30 BEARING FRAME (WITHOUT INDUCER)
L50 SERIES BASE MOUNTED ASSEMBLY WITH P30 BEARING FRAME (WITH INDUCER)ALL L50 MODELS MODEL L52 MODEL L53 MODEL L54 MODEL L55
FRAME CPLG 2F D W E H K S P L S P L S P L S P L184T 5J 5 1/2 5 1/4 12 3 3/4 3/8-16 3/4 8 7/16 15 5/16 40 10 15/16 17 13/16 45 13 7/16 20 5/16 45 15 15/16 22 13/16 50213T 6J 5 1/2 5 1/4 12 4 1/4 3/8-16 7/8 8 7/16 15 5/16 45 10 15/16 17 13/16 50 13 7/16 20 5/16 50 15 15/16 22 13/16 55215T 6J 7 5 1/4 12 4 1/4 3/8-16 7/8 8 7/16 15 5/16 45 10 15/16 17 13/16 50 13 7/16 20 5/16 50 15 15/16 22 13/16 55254T 7S 8 1/4 6 1/4 15 5 1/2-13 1 8 7/16 15 5/16 50 10 15/16 17 13/16 55 13 7/16 20 5/16 55 15 15/16 22 13/16 60256T 7S 10 6 1/4 15 5 1/2-13 1 8 7/16 15 5/16 50 10 15/16 17 13/16 55 13 7/16 20 5/16 55 15 15/16 22 13/16 60
284TS 8S 9 1/2 7 15 5 1/2 1/2-13 1 1/8 8 7/16 15 5/16 55 10 15/16 17 13/16 55 13 7/16 20 5/16 60 15 15/16 22 13/16 60286TS 8S 11 7 15 5 1/2 1/2-13 1 1/8 8 7/16 15 5/16 55 10 15/16 17 13/16 55 13 7/16 20 5/16 60 15 15/16 22 13/16 60324TS 8S 10 1/2 8 18 6 1/4 21/32 1 1/8 8 7/16 15 5/16 55 10 15/16 17 13/16 55 13 7/16 20 5/16 60 15 15/16 22 13/16 60326TS 8S 12 8 18 6 1/4 21/32 1 1/8 8 7/16 15 5/16 55 10 15/16 17 13/16 55 13 7/16 20 5/16 60 15 15/16 22 13/16 60
ALL M50 MODELS MODEL M52 MODEL M53 MODEL M54 MODEL M55FRAME CPLG 2F D W E H K S P L S P L S P L S P L
184T 5J 5 1/2 5 1/4 12 3 3/4 3/8-16 3/4 7 1/2 13 3/8 40 10 15 7/8 45 12 1/2 18 3/8 45 15 20 7/8 50213T 6J 5 1/2 5 1/4 12 4 1/4 3/8-16 7/8 7 1/2 13 3/8 45 10 15 7/8 45 12 1/2 18 3/8 50 15 20 7/8 50215T 6J 7 5 1/4 12 4 1/4 3/8-16 7/8 7 1/2 13 3/8 45 10 15 7/8 45 12 1/2 18 3/8 50 15 20 7/8 50254T 7S 8 1/4 6 1/4 15 5 1/2-13 1 7 1/2 13 3/8 50 10 15 7/8 50 12 1/2 18 3/8 55 15 20 7/8 55256T 7S 10 6 1/4 15 5 1/2-13 1 7 1/2 13 3/8 50 10 15 7/8 50 12 1/2 18 3/8 55 15 20 7/8 55
284TS 8S 9 1/2 7 15 5 1/2 1/2-13 1 1/8 7 1/2 13 3/8 50 10 15 7/8 55 12 1/2 18 3/8 55 15 20 7/8 60286TS 8S 11 7 15 5 1/2 1/2-13 1 1/8 7 1/2 13 3/8 50 10 15 7/8 55 12 1/2 18 3/8 55 15 20 7/8 60324TS 8S 10 1/2 8 18 6 1/4 21/32 1 1/8 7 1/2 13 3/8 50 10 15 7/8 55 12 1/2 18 3/8 55 15 20 7/8 60326TS 8S 12 8 18 6 1/4 21/32 1 1/8 7 1/2 13 3/8 50 10 15 7/8 55 12 1/2 18 3/8 55 15 20 7/8 60
NOTESAll dimensions in inches. May vary ± 1/4 inches.Not for construction purposes unless certified.*See motor price sheet for C dimension (varies depending on motor enclosure)
1 Four 17/32 Dia. Foundation Holes Two 1/2 - 13 Taps 1
1
W
1Four H Taps Two 1/2-13 Taps
E
E
4 1/4
4 1/4
L
2F
4 1/2K
1 1/4 NPT Inlet
C*
Ø1 1/8
1 1/4 NPTDischarge
5 1/4 2 1/2
S
P
5 1/8
5 1/8
3/16 Key
D
1 1/2
4 1/4
