turbine pumps - jvpump.com · regenerative turbine pumps mth m50 • l50 series vertical base mount...

• Capacities to 38 GPM• Heads to 2300 Feet

MTH PUMPS

Bulletin M50 • L50

RegenerativeTurbine Pumps

M50 • L50 Series

RegenerativeTurbine Pumps

MTH M50 • L50 SeriesVertical base mount and horizon-tal pedestal mounted multi-stageregenerative turbine pumpsrepresent the most economicalhigh performance alternative forlow flow (2 to 38 GPM) applica-tions involving moderate to highpressures (heads to 2300 feet).By combining the latest conceptsin hydraulic turbine pump designwith precision computer controlledmanufacturing, M50 • L50 Seriespumps deliver high efficiencyoperation even at low NPSH.Costs are controlled by efficientmanufacturing processes, use ofstandard motors, and highlyoptimized pump designs. Mainte-nance costs are kept to a mini-mum by combining an easilyserviceable design with the use ofhigh quality components toprovide long life.

Water Passage DesignMTH masters one of the mostcritical design considerations ofregenerative turbine pumps - theshaping of water passageways toachieve maximum capacity andpressure while minimizinghorsepower requirements. Byoptimizing water passagewaycross-sectional profiles for eachimpeller, MTH improves bothefficiency and pressure in the M50• L50 Series, and exceeds the

standards realized by previoustechniques.Impeller ProfileOne of the most notable improve-ments in regenerative turbinepump technology, incorporated inM50 • L50 Series pumps, involvesthe ability to determine theoptimum impeller width and bladelength. These factors have asignificant effect on the requiredhorsepower versus pressurecurve for regenerative turbinepumps. By optimizing these foreach pump, peak efficiency isimproved and “off peak” horse-power requirements are reducedas well.

Impeller BladesAfter the most favorable impellerprofile has been determined for aparticular water passagewaycross-section, MTH calculates thenumber of blades needed tomaximize the performance of thatpump. The blade design in M50 •L50 Series pumps increases bothefficiency and design pressurewithout incurring the manufactur-ing difficulties associated withproducing contoured bladeimpellers. State-of-the-artcomputer controlled machinessimplify manufacturing of thevarious MTH impellers utilized inthe M50 • L50 Series. The result

is a high performance pumpproviding efficiency characteristicsexceeding those of much moreexpensive units.NPSH RequirementsM50 • L50 Series regenerativeturbine pumps meet low netpositive suction head (NPSH)requirements without efficiencyloss. This is achieved by keepingthe inlet fluid velocity low and thengently accelerating to passagewayvelocities. Special ramps areresponsible for this gentle fluidentry into the impeller blades andaccount for the high inlet effi-ciency of the M50 • L50 Seriespumps.

Low NPSH RequirementsL50 Series regenerative turbinepumps have exceptionally lowNPSH requirements, making themideally suited for applicationswhere very little inlet head isavailable.This reduced NPSHR provided bythe L50 Series is obtained byusing a first stage centrifugal styleimpeller with inlet flow pathsshaped to maintain a constantfluid velocity. This reduces entrylosses to the impeller as well asmaintaining efficiency. A multi-vane diffuser is used in conjunc-tion with the centrifugal impellerfor balancing radial loads andextracting the maximum pressurefrom the first stage. Pressure andflow produced by the NPSHinducer assures that the succeed-ing stages are adequately fed.

STANDARD MATERIALS LIMITATIONS

M50 • L50 Series

EZNORB LLA SSELNIATS erusserPegrahcsiD ISP0001TRAP DETTIF NORILLA EZNORB LEETS *erusserPlaeS ISP002

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84AMTSA 84AMTSA 26BMTSA 613ISIA deepS MPR0063

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84AMTSA 84AMTSA 26BMTSA 613ISIA noitcurtsnoCdradnatS F°02-

rellepmIeznorB leetSnobraC eznorB leetSsselniatS retaW-taeSlaeScimareC F°032

26BMTSA 41L21 26BMTSA 88ahsekuaW &taeSlaeSedibraCnociliShsulFlaeSlanretxE

tfahSleetSsselniatS leetSsselniatS leetSsselniatS leetSsselniatS F°052

614ISIA 614ISIA 613ISIA 613ISIA rewopesroH

sgniR"O" NanuB NanuB NanuB AnotiV3P-3C PH3ot3/1

03P-03C PH03ot5

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D

1 1/2

L

4 1/2

1 1/4 INLET 1 1/4 DISCH.

S

4 1/4

P3 Bearing Frame

Horizontal Pedestal Mounted

P30 Bearing Frame

8 1/2

W

RC-AH

All dimension in inches. May vary ± 1/4 inches.

RECUDNITUOHTIWSPMUP05M

LLA 15MLEDOM 25MLEDOM 35MLEDOM 45MLEDOM 55MLEDOM

EMARF D HA-CR

)3P(R

)03P( W SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P(65 4/15 31

561/51

61/19 21

OTREFERSEIRES15T

2/17 23 01 53 2/121 83 51 04

T541-T341 4/15 315

61/5161/19 21 2/17 53 01 53 2/121 83 51 04

T481-T281 4/15 2/1415

61/5161/19 21 2/17 53 04 01 83 54 2/121 04 54 51 54 05

T512-T312 4/15 715

61/5161/19 21 2/17 54 01 54 2/121 05 51 05

T652-T452 4/16 2/1125

61/5161/19 51 2/17 05 01 05 2/121 55 51 55

-T682-ST482S

7 2/1325

61/5161/19 51 2/17 05 01 55 2/121 55 51 06

RECUDNIHTIWSPMUP05L

LLA 15LLEDOM 25LLEDOM 35LLEDOM 45LLEDOM 55LLEDOM

EMARF D HA-CR

)3P(R

)03P( W SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P( SL

)3P(L

)03P(65 4/15 31 7 8/101 21 61/515 23 61/78 53 61/5101 83 61/731 04 61/5151 54

T541-T341 4/15 31 7 8/101 21 61/515 23 61/78 53 61/5101 83 61/731 04 61/5151 54T481-T281 4/15 2/141 7 8/101 21 61/515 53 83 61/78 83 04 61/5101 04 54 61/731 54 54 61/5151 54 05T512-T312 4/15 71 7 8/101 21 61/515 54 61/78 54 61/5101 05 61/731 05 61/5151 55T652-T452 4/16 2/112 7 8/101 51 61/515 05 61/78 05 61/5101 55 61/731 55 61/5151 06

-T682-ST482 7 2/132 7 8/101 51 61/515 05 61/78 55 61/5101 55 61/731 06 61/5151 06

M50 • L50 SERIES

L

4 1/2


SRC-AH

5 1/2

S

1 1/4 DISCH.1 1/4 INLET

2R

3 Feet Slotted forTwo 3/8 Cap Screws

5 1/4

S1 1/4 DISCH.1 1/4 INLET

Feet Slotted forTwo 1/2 Cap Screws

2R

8 1/2

L

4 1/2


S

D

1 1/2

4 1/4

L

4 1/2

1 1/4 DISCH.

S

1 1/4 INLET

Horizontal Close Coupled

C3 Motor Frame

C30 Motor Frame

Standard M50 Series Low NPSH L50 Series

8 1/2

W



EMARF D HA-C W SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C(65 4/15 31 21 2/17 82 01 23 2/121 53 51 04

T541-T341 4/15 31 21

OTREFERSEIRES15T

2/17 82 01 23 2/121 53 51 04

T481-T281 4/15 2/141 21 2/17 03 82 01 23 03 2/121 53 23 51 04 53T512-T312 4/15 71 21 2/17 23 01 53 2/121 04 51 04

T652-T452 4/16 2/112 51 2/17 53 01 04 2/121 04 51 54ST682-ST482 7 2/132 51 2/17 04 01 04 2/121 54 51 54

RECUDNIHTIWSPMUP05L


EMARF D HA-C W SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C( SL

)3C(L

)03C(65 4/15 31 21 61/515 82 61/78 03 61/5101 23 61/731 53 61/5151 04

T541-T341 4/15 31 21 61/515 82 61/78 03 61/5101 23 61/731 53 61/5151 04T481-T281 4/15 2/141 21 61/515 03 82 61/78 23 03 61/5101 53 23 61/731 04 53 61/5151 04 04T512-T312 4/15 71 21 61/515 03 61/78 53 61/5101 53 61/731 04 61/5151 04T652-T452 4/16 2/112 51 61/515 53 61/78 04 61/5101 04 61/731 54 61/5151 54

ST682-ST482 7 2/132 51 61/515 04 61/78 04 61/5101 54 61/731 54 61/5151 05


C-AH

C-AH

M50 • L50 SERIES

1 1/4 INLET

1 DISCHARGE

4 5/8 4 5/8 1 1/8

3 7/81 1/2

10Feet Slotted for Two 1/2-13 Cap Screws

5

8 1/4 2

7/8

4 1/4

5 1/4

4

1 1/4 INLET

1 1/4 DISCHARGES

1 3/8

4 5/84 5/8 5 4 1/4

7/8

5

10Feet Slotted for Three 1/2-13 Cap Screws

P

Vertical Close Coupled

Single Stage

Multi-Stage

C-AH

C-AH


9 1/42

G

M50 • L50 SERIES



EMARF HA-C G S P S P S P S P S P

C65 31 61/31

ROWOLEBEESOTREFERSEIRES15T

2/17 61/101 01 61/921 2/121 61/151 51 61/971

T541-T341 31 61/31 2/17 61/101 01 61/921 2/121 61/151 51 61/971

T481-T281 2/141 61/31 2/17 61/101 01 61/921 2/121 61/151 51 61/971

T512-T312 71 61/31 2/17 61/101 01 61/921 2/121 61/151 51 61/971

T652-T452 2/112 61/31 2/17 61/101 01 61/921 2/121 61/151 51 61/971

ST682-ST482 2/132 61/31 2/17 61/101 01 61/921 2/121 61/151 51 61/971

RECUDNIHTIWSPMUP05L


EMARF HA-C G S P S P S P S P S PC65 31 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/171

5161/51

61/991

T541-T341 31 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/17151

61/5161/991

T481-T281 2/141 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/17151

61/5161/991

T512-T312 71 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/17151

61/5161/991

T652-T452 2/112 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/17151

61/5161/991

ST682-ST482 2/132 4/12 61/515 61/99 61/78 61/121 61/5101 61/941 61/731 61/17151

61/5161/991

The contractor shall furnish (and install asshown on the plans) an MTH M50 Series(horizontal) (vertical base mount) closecoupled regenerative turbine type pumpmodel _____ size ____ of (BRONZEFITTED) (ALL IRON) (ALL BRONZE) (316STAINLESS STEEL) construction. Eachpump shall have a capacity of ___GPMwhen operating at a total head of ___feet.Suction pressure will be ___feet with aliquid temperature of ___degrees F.The pump is to be furnished with amechanical seal with stainless steel metalparts, (Buna) (EPR) (Teflon) (Viton)elastomers, (ceramic) (ni-resist) (siliconcarbide) (tungsten carbide) seat andcarbon washer. Pump will have shaftsleeve or stainless steel shaft which willprevent pumped fluid from contactingmotor shaft.The pump shall be vertically split designwith replaceable external channel ringsthat have water passageways accuratelymachined into each ring. The suction anddischarge will have (NPT) (SAE) (BSP)(ISO) threads located in the top verticalposition for self-venting and shall be castseparately from one another. Theimpeller(s) shall be hydraulically self-centering and no external adjustment shallbe necessary.The pump shall be mounted to a standardNEMA __HP __phase __Hertz __volt__RPM (horizontal) (vertical), (opendripproof) (totally enclosed) (explosionproof) motor. Each pump shall be testedat the specified capacity and head prior toshipment. The motor shall be sized toprevent overloading at the highest headcondition listed in the specifications.

The contractor shall furnish (and install asshown on the plans) an MTH L50 Series(horizontal) (vertical base mount) closecoupled regenerative turbine type pumpmodel _____ size ____ of (BRONZEFITTED) (ALL IRON) (ALL BRONZE) (316STAINLESS STEEL) construction. Eachpump shall have a capacity of ___GPMwhen operating at a total head of ___feet.Suction pressure will be ___feet with aliquid temperature of ___degrees F.The pump is to be furnished with amechanical seal with stainless steel metalparts, (Buna) (EPR) (Teflon) (Viton)elastomers, (ceramic) (ni-resist) (siliconcarbide) (tungsten carbide) seat andcarbon washer. Pump will have shaftsleeve or stainless steel shaft which will

Engineering SpecificationsM50 • L50 SERIES

M Series Close Coupled prevent pumped fluid from contactingmotor shaft.The pump shall be low NPSHR inducerstyle design with a centrifugal radial vanedesign impeller and a multi-vane diffuserfor balancing radial loads. Pump shall bevertically split design with replaceableexternal channel rings that have waterpassageways accurately machined intoeach ring. The suction and discharge willhave (NPT) (SAE) (BSP) (ISO) threadslocated in the top vertical position for self-venting and shall be cast separately fromone another. The impeller(s) shall behydraulically self-centering and no externaladjustment shall be necessary.The pump shall be mounted to a standardNEMA __HP __phase __Hertz __volt__RPM (horizontal) (vertical), (opendripproof) (totally enclosed) (explosionproof) motor. Each pump shall be testedat the specified capacity and head prior toshipment. The motor shall be sized toprevent overloading at the highest headcondition listed in the specifications.

The contractor shall furnish (and install asshown on the plans) an MTH M50 Serieshorizontal pedestal mount regenerativeturbine type pump model _____ size ____of (BRONZE FITTED) (ALL IRON) (ALLBRONZE) (316 STAINLESS STEEL)construction. Each pump shall have acapacity of ___GPM when operating at atotal head of ___feet. Suction pressure willbe ___feet with a liquid temperature of___degrees F.The pump is to be furnished with amechanical seal with stainless steel metalparts, (Buna) (EPR) (Teflon) (Viton)elastomers, (ceramic) (ni-resist) (siliconcarbide) (tungsten carbide) seat andcarbon washer. Pump will be furnishedwith a shaft sleeve or stainless steel shaftand shall be vertically split design withreplaceable external channel rings thathave water passageways accuratelymachined into each ring. The suction anddischarge will have (NPT) (SAE) (BSP)(ISO) threads located in the top verticalposition for self-venting and shall be castseparately from one another. Theimpeller(s) shall be hydraulically self-centering and no external adjustment shallbe necessary.The pump shall be mounted on a bearingpedestal with sealed, grease lubricated ballbearings having a two year minimumdesign life under a maximum pumpdifferential pressure of 1000 PSI, and theshaft shall be of 416 stainless steelmaterial. Pump and motor shall be

L Series Close Coupled

mounted on a common steel baseplate,flexible coupled with coupling guard to astandard horizontal NEMA __HP __phase__Hertz __volt __RPM (open dripproof)(totally enclosed) (explosion proof) motor.Coupling alignment shall be checked afterinstallation. Each pump shall be tested atthe specified capacity and head prior toshipment. The motor shall be sized toprevent overloading at the highest headcondition listed in the specifications.

The contractor shall furnish (and install asshown on the plans) an MTH L50 Serieshorizontal pedestal mount regenerativeturbine type pump model _____ size ____of (BRONZE FITTED) (ALL IRON) (ALLBRONZE) (316 STAINLESS STEEL)construction. Each pump shall have acapacity of ___GPM when operating at atotal head of ___feet. Suction pressure willbe ___feet with a liquid temperature of___degrees F.The pump is to be furnished with amechanical seal with stainless steel metalparts, (Buna) (EPR) (Teflon) (Viton)elastomers, (ceramic) (ni-resist) (siliconcarbide) (tungsten carbide) seat and carbonwasher.The pump shall be low NPSHR inducerstyle design with a centrifugal radial vanedesign impeller and a multi-vane diffuser forbalancing radial loads. Pump will befurnished with a shaft sleeve or stainlesssteel shaft and shall be vertically splitdesign with replaceable external channelrings that have water passagewaysaccurately machined into each ring. Thesuction and discharge will have (NPT)(SAE) (BSP) (ISO) threads located in thetop vertical position for self-venting andshall be cast separately from one another.The impeller(s) shall be hydraulically self-centering and no external adjustment shallbe necessary.The pump shall be mounted on a bearingpedestal with sealed, grease lubricated ballbearings having a two year minimum designlife under a maximum pump differentialpressure of 1000 PSI, and the shaft shallbe of 416 stainless steel material. Pumpand motor shall be mounted on a commonsteel baseplate, flexible coupled withcoupling guard to a standard horizontalNEMA __HP __phase __Hertz __volt__RPM (open dripproof) (totally enclosed)(explosion proof) motor. Coupling alignmentshall be checked after installation. Eachpump shall be tested at the specifiedcapacity and head prior to shipment. Themotor shall be sized to prevent overloadingat the highest head condition listed in thespecifications.

M Series Flex Coupled

L Series Flex Coupled

This first stage impeller is used inconjuction with a muti-vanediffuser to provide the secondstage regenerative turbine withadequate suction head.

L50 Series pumps can effectivelyhandle NPSH availability as lowas two feet, depending on themodel and capacity.

Steep Head/Capacity Curve.Pumping capacity varies onlyslightly as pressure changes.Steep pressure characteristicovercomes temporary lineresistances.

Self-Adjusting Impeller. M50 •L50 impellers utilize balanc-ing holes to promotehydraulic self centering,which eliminates the needfor external adjustment.The free sliding impellerexerts no thrust load on thebearings, thereby extend-ing service life. Self-centering is equally effectivewhether mounted in the horizontalor vertical position.

Mechanical Seals. Bronze fittedpumps have Buna N elastomers,carbon washer, ceramic seat, andstainless steel metal parts.Optional seats and materials areavailable.

1000 PSI Case Working Pressure.Rigid stucture is designed formaximum casing strength.

100% Tested. Every pump is fullytested to verify performance priorto shipment.

Volatile Fluid Handling. Theturbine impeller handles vapors upto 20% by volume, minimizing thepossibility of vapor lock.

“O”Ring Gaskets. “O”ring gasketsare used throughout the M50 •L50 Series pumps to assurepositive sealing.

Shaft. Standard shaft is of highstrength 416 stainless steel.

Motors. Standard 56C facemotors are utilized up to 3 Hp. 5Hp and above are TEFC onvertical base mount units.

Best Efficiency. New pump designsoptimize efficiency for each size.

Non-Cavitating. M50 • L50 Seriespumps may be operated underadverse inlet conditions withoutaudible or measurable cavitation.

Low NPSH. New inlet designsalong with L50 Series inducer stylepumps provide superior fluidhandling ability with low inlet headconditions.

Design FeaturesM50 • L50 SERIES

L50 Series Inducer forLow NPSH

L50 Series inducer style pumpsare designed specifically forapplications where the netpositive suction head availableat the pump inlet is limited, suchas in boiler feed water deaeratorservice.A centrifugal style impeller withgood low NPSH characteristicsis utilized to lower the inlet headrequirements.

Balanced Loads. By staggering eachstage’s discharge by 180°, the radialloads on the bearings are effectivelybalanced, and shaft deflection isthereby negligible.

Interstage Bushings. Close toleranceself-lubricating carbon bearings be-tween each stage limit interstage leak-

age.

Construction Materials. Bronzefitted, all iron, all bronze and cast316 stainless steel are available asstock materials.

Bearing Pedestals. All models canbe pedestal mounted for flexiblecoupled drive.

“O”Ring Gaskets. Buna, EPR,Viton, Neoprene, and Teflon areavailable.

Mechanical Seals. Buna, EPR,Viton, Neoprene, and Teflonelastomers, tungsten, silicon

carbide or ni-resist seats.

Flush Line. An external flush linefrom pump discharge to seal face(when used with the optional siliconcarbide seat), allows operation inwater up to 250°F.

Water Seal Connection. A tappedopening can be provided for sealflushing from an external source.

Inlet Strainer. A 90° suction strainerwith a replaceable stainless steelscreen is available for installation inthe suction line to aid in preventingforeign material from entering thepump. A cap at the bottom of thestrainer can be easily and quicklyremoved for screen cleaning orreplacement.

Optional Features

U.S. GALLONS PER MINUTE

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

HE

AD

IN F

EE

T

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

Performance Curves

MTH PUMPS401 West Main Street • Plano, IL 60545-1436Phone: 630-552-4115 • Fax: 630-552-3688

http://WWW.MTHPUMPS.COM

3450 RPM


10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42

HE

AD

IN F

EE

T

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

B C D E G J

J L M P R

BULLETIN M50 © MTH 1998

3/4

1

1 1/22

2

5

3

3

1

1

2 2

3

3

3/4

3

3

5

5

1

7 1/2

7 1/2

10

2

5

5

10

10

7 1/2

5

3

5

5

15

2

5

10

10

15

3

10

15

20

5

10

10

15

20

25

20

15

23

2

57 1/2

1 1/2

M50 • L50 SERIES

7 1/2

• Indicates Approximate Horsepower (Including Motor Service Factor)Most Efficient RangeAcceptable Operating Range

2

3/4

1 1/2

1 1/2

3

2

3/4

1 1/2

1 1/2

3

1

1 1/22

5

1 1/2

5

7 1/2

1 1/2

7 1/2

10

1 1/2

7 1/27 1/2 7 1/2

10

5

35

7 1/2

10

15

3450 RPM

MODELS B - J

MODELS J - R

M50 • L50 SERIES

Performance Curves


3450 RPM

3450 RPM

M50 • L50 Series

M50 • L50 Series

Section M50 • L50 Page 401Dated June 1998

1

2

5

3

3

1

1

2

33

3/4

3

55

1

7 1/2

7 1/2

10

1 1/22

5

10 10

2

5

5

5

15

2

3

5

10

1010

15

3

15

20

10

10

15

20

25

20

15

7 1/2

1 1/2

3/4

7 1/2

7 1/2

7 1/27 1/2

7 1/2

1

2

2

7 1/2

1 1/2

23

5

5

3/4

1 1/2

2

21 1/2

3

B C D E G J

10

3

3

15

7 1/2

55 5 7 1/2

1 1/25

10

2

10

1 1/2

5

3/4

1 1/2

1 1/2

1 1/2

NOTESIndicates Motor Horsepower RatingUsing the Service Factor for Standard MTH Motors

Recommended Operating RangeAcceptable Operating Range

Horsepower data is valid for 1.0 specific gravity fluids only

•

3

J L M P R


M50 • L50 SERIES

Performance Curves

2880 RPM

2880 RPM

M50 • L50 Series

M50 • L50 Series


8 10 12 14 16 18 20 22 24 26 28 30 32 34

HE

AD

IN F

EE

T

0

200

400

600

800

1000

1200

1400

1600

1800

0

200

400

600

800

1000

1200

1400

1600

1800


2

3

10

2

3

3

5

5

5

7 1/2

7 1/2

1010

10

1010

1010

15

15

15 15

20 20

1 1/2

5

7 1/27 1/2

7 1/25

7 1/2

1 1/2

7 1/2

2

5

NOTESIndicates Motor Horsepower Rating for Standard MTH Motors


Horsepower data is valid for 1.0 specific gravity fluids only

•

5

J L M P R


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

0

200

400

600

800

1000

1200

1400

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1800

B C D E G J

3/4

1

2

3

3/4

1

1

1 1

1 1/2

2

2

22

2

22

3 3

3

33

5

5

5 5

1 1/2

3/4

3/4

1 1/2

1 1/2

1 1/2

2 5

7 1/2

10

7 1/2

7 1/2

3/4

1 1/2

1 1/2

1 1/2

1

2

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50

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

20

25

BH

P

0

1

2

3

4

5


M5B1 • L51B*

M55B • L55B*

M54B • L54B*

M51B1 • L51B

M52B • L52B

M53B • L53B

M50B NPSHR

L50B NPSHR

○ ○ ○ ○

3/4

1

1 1/2

2

1

2

3

1

2

3

1 1/2

2

3

M55B • L55B

M54B • L54B

1 1/23/4

M52B • L52B*

M53B • L53B*



*Add .43 horsepower for L50B Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

•

B B

1 1/2


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50

U.S. GALLONS PER MINUTE0 1 2 3 4

HE

AD

IN F

EE

T

0

500

1000

1500

2000

NP

SH

IN F

EE

T

0

5

10

15

20

BH

P

0.0

0.5

1.0

1.5

2.0

2.5

3.0


M5B1 • L51B

M52B • L52B

M53B • L53B

M5B1 • L51B*

M52B • L52B*

M53B • L53B*

M55B • L55B*

L50B NPSHR

M54B • L54B

M55B • L55B

M50B NPSHR

2

1 1/2

3/4

3/4

3/4

1

1

1

1 1/21 1/2

1 1/2

2 2

M54B • L54B*

NOTESIndicates Motor Horsepower Ratingfor Standard MTH Motors

Usable Operating RangeRefer 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

U.S. GALLONS PER MINUTE0 1 2 3 4 5 6

HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

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

1

3/43/4

1

1 1/2

2

1

1 1/2

2

3

2

3

2

3

1 1/2

1 1/2



*Add .45 horsepower for L50C Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

M53C • L53C*

•

C C


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50


0 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

15

20

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*

3

3/4

1

3

2

22

1 1/2

1 1/2

1 1/2

1

13/4

1 1/2



*Add .27 horsepower for L50C Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

M50C NPSHR

•

C C

M54C • L54C

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50

U.S. GALLONS PER MINUTE0 1 2 3 4 5 6 7 8

HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

BH

P

0

1

2

3

4

5

6


M51D • L51D*

M52D • L52D*

M53D • L53D*

M54D • L54D*

M51D • L51D

M52D • L52D

M53D • L53D

M55D • L55D

M50D NPSHR

L50D NPSHR

M54D • L54D

1

3/4

3/4

1

1 1/2

2

3

5

1 1/2

3

2

1

1 1/2

5

3

2

3

5

2



*Add .49 horsepower for L50D Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

1 1/2

D D

M55D • L55D*


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50

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

15

20

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

21 1/2

1

3/4

3

3 3

2

2 21 1/2

1 1/2 1 1/2

1 1/21 1

3/4



*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


HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

BH

P

0

2

4

6

8

10


M51E • L51E*

M52E • L52E*

M55E • L55E*

M50E NPSHR

M51E • L51E

M54E • L54E

M52E • L52E

L50E NPSHR

M53E • L53E*

M54E • L54E*

M55E • L55E

2

13/4

3

2

1 1/2

5

3

2

5

3

7 1/2

5

3

M53E • L53E

1 1/2



*Add .57 horsepower for L50E Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

5

E E


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50

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

15

20

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*

2

1 1/2

1

3/4

5

5

5

3

3

3

32

21 1/2

M51E • L51E*

M54E • L54E



*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


HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

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

10

7 1/2

5

7 1/2

5

7 1/2

5

7 1/2

5

3

2

3

2

1 1/2

1



*Add .62 horsepower for L50G Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

10

M50G NPSHR

•

3

G G


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50


HE

AD

IN F

EE

T

0

500

1000

1500

2000

NP

SH

IN F

EE

T

0

5

10

15

20

BH

P

0

1

2

3

4

5

6

7

8

9

10


M55G • L55G*

M53G • L53G

M51G • L51G

M54G • L54G M55G • L55G

M50G NPSHR

L50G NPSHR

M53G • L53G*

1

3

2

1 1/2

7 1/2

7 1/27 1/2

5

5

5

5

3

3

2

M54G • L54G*

M52G • L52G*

M51G • L51G*

M52G • L52G



*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

U.S. GALLONS PER MINUTE0 2 4 6 8 10 12 14 16 18

HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

BH

P

0

5

10

15

20

25

M51J • L51J

M52J • L52J

M53J • L53J

M55J • L55J

M51J • L51J*

M52J • L52J*

M53J • L53J*

M55J • L55J*


M50J NPSHR

M54J • L54J*

M54J • L54J

L50J NPSHR

1 1/2

2

3

5

7 1/2

10

7 1/2

5

7 1/2

10

7 1/2

10



*Add .70 horsepower for L50J Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

3

5

J J


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50


HE

AD

IN F

EE

T

0

500

1000

1500

2000

NP

SH

IN F

EE

T

0

5

10

15

20

BH

P

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

M51J • L51J*

M51J • L51J

M52J • L52J

M53J • L53J

M55J • L55J


M50J NPSHR

L50J NPSHR

M53J • L53J*

M55J • L55J*

1 1/2

7 1/2

3

2

5

7 1/2 7 1/2 7 1/2

5

5

53

10 10

10M54J • L54J



*Add .38 horsepower for L50J Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

J J

M54J • L54J*

M52J • L52J*

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50


0 4 8 12 16 20 24

HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

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 • L54L

M53L • L53L

2

3

7 1/2

10

3

5

5

7 1/2

10

5

7 1/2

10

15

7 1/2

10

15



*Add .81 horsepower for L50L Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

L L

M53L • L53L*


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50

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

15

20

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*

1 1/2

32

5

7 1/2

7 1/27 1/2

7 1/2

10

1010

5

55

3



*Add .43 horsepower for L50L Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

L L

M51L • L51L

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50


HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

BH

P

0

5

10

15

20

25

30

35

M52M • L52M

M55M • L55M

M53M • L53M

M51M • L51M*

M52M • L52M*

M55M • L55M*


M50M NPSHR

M54M • L54M

M54M • L54M*

M51M • L51M

L50M NPSHR

2

3

5

5

7 1/2

10

5

7 1/2

10

15

5

7 1/2

10

15

7 1/2

10

15



*Add .86 horsepower for L50M Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

M53M • L53M*

•

M M


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50

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

20

BH

P

0

5

10

15

20


M51M • L51M

M52M • L52M

M54M • L54M

M55M • L55M

M53M • L53M

M50M NPSHR

L50M NPSHR

M51M • L51M*

M52M • L52M*

M53M • L53M*

M54M • L54M*M55M • L55M*

1 1/2

2

7 1/2

3

15

10

10

10

7 1/25

5

5

5

7 1/2

3



*Add .46 horsepower for L50M Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

M M

7 1/2

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50


HEA

D IN

FEE

T

0

500

1000

1500

2000

2500

NP

SH

IN F

EE

T

0

5

10

15

20

25

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

23

5

5

7 1/2

10

7 1/2

10

15

7 1/2

10

15

20

20

15

10



*Add .97 horsepower for L50P Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

P P

M53P • L53P*


M50 • L50 SERIES

Performance Curves

2880 RPMM50 • L50


HE

AD

IN F

EE

T

0

500

1000

1500

2000

NP

SH

IN F

EE

T

0

5

10

15

20

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*

1 1/22

10

5

3

15

15 15

10

10 10

7 1/2

7 1/2

7 1/2 7 1/25

55

3

20



*Add .53 horsepower for L50PO Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

M52P • L52P*

•

P P

M54P • L54P*

M50 • L50 SERIES

Performance Curves


3450 RPMM50 • L50

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

25

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

3

5

7 1/2

15

20

5

7 1/2

10

7 1/2

10

15

20

25

10

15

20

25

30

25

20

15



*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

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

20

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

2

7 1/2

5

3

20

20

20

15

15 15

10

1010 10

7 1/2

7 1/27 1/2

7 1/25

25

M52R • L52R*



*Add .61 horsepower for L50R Inducer ModelsHorsepower data is valid for 1.0 specific gravity fluids only

○ ○ ○ ○

•

R RM54R • L54R

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