ASME B73.1

Chemical

Processing

Pump

Wilfley

M o d e l A 7

Technical Handbook

Wilfley Model A7 Chemical Processing Pumps

Wilfley hydraulic seal in actual operation.

ASME B73.1 M-91

Wilfley’s Model A7 pump seriesoffers maximum efficiency coupledwith ultimate seal flexibility. It isdesigned to be sealless, but canalso be used with virtually anytraditional seal—packing ormechanical.

The Model A7 is an end-suction,single-stage centrifugal pump thatmeets ASME B73.1 M-91requirements. It handles liquids thatare highly corrosive and abrasive.Discharge sizes range from 1" to 8"in diameter. Flow rates range to4,500 gallons per minute.

Original Sealless Operation

To prevent leakage while running,Model A7 pumps have the originalWilfley expeller. The impeller andexpeller rotate together during

operation creating a hydraulic sealthat keeps liquids away from theshaft while the pump is operating.

Static seal faces prevent leakagewhen the pump is shut down. Thepump remains leak free whilerunning and while shut down.

Wilfley seals can be run dry withoutdamaging internal parts becausewetted parts operate freely with norubbing contact. Constant downtime to repair and replaceconventional contact seals iseliminated.

Ultimate Flexibility

Wilfley Model A7 pumps aredesigned to handle a wide range ofcorrosive applications—no matterwhat the requirements. Wilfleyengineers each pump to perform toexact specifications.

Discharge

Pump Running/Seal Open

Pump Off/Seal Closed

Imp

elle

r

Exp

elle

r

Suction

A.R. Wilfley & Sons is proud of theindividual engineering servicetraditionally provided to customers.Wilfley engineers have developednew sealing flexibility in answer tocustomers’ requests.

The DryLock® and Lube Seal arenow exclusively available throughWilfley for the Model A7. The Model A7 can also use most otheravailable seals. This flexibilityextends to vapor seals. The A7series frame can use conventionallip seals, labyrinth or magnet seals.

Tradition of Innovation and Quality

Arthur Redman Wilfley was aninventor and entrepreneur. Hebegan working on centrifugalpumps in 1902. Wilfley’s firstcommercially-available pump wassold in 1919 and was built aroundhis unique concept of the expellerfor hydraulic sealing. He continuedto perfect the expeller design andreceived a patent in 1920. Theexpeller is now the hallmark of allWilfley pumps.

Today, Wilfley’s applications andengineering staff continue toprovide the most up-to-dateinformation and innovativetechnology on pumps and pumpprocesses to customers around theworld.

Wilfley’s pump lines include a widerange of centrifugal pumps that aredesigned to handle highly-abrasiveslurries and corrosive materials.

To locate the Wilfley office or agentnearest you, please contact A.R. Wilfley & Sons, Inc. directly at 1-800-525-9930 orwww.wilfley.com.

Impeller pumps liquidfrom suction todischarge.

Expeller createspressure keepingliquid from shaft.

2

Wilfley Model A7 Features and Benefits

Centrifugally actuated seal provides smoothand efficient seal opening and closing.

Guards isolate allmoving parts.

Extra case wall thickness extendswear life.

Rotary andstationary seal facesare open duringoperation and closedto prevent leakagewhen the pump isshutdown.

Large impeller vanesprovide highly-efficient pumpingwith long wear life.

The Wilfley expelleris a non-contacting,hydrodynamic sealthat provides long,trouble-free life andminimal operatingcosts and downtime.

Baseplate and frameare heavy cast ironwith heavy ribreinforcements madeto withstand severeoperating loads.Non-metallic andfabricated baseplatesare available.

Shaft is isolated fromliquid. Sleeves available inwide variety of alloys.

Wide range ofmaterials available.

Close-fitting lipexcludescontaminants fromprimary seal.

Frame support to ease assembly

3

Extreme Duty Bearings

Cartridge-type Wilfley hydrodynamicseal to simplify maintenance.

Optional vapor seal meets EPA requirements.

Non-metallic labyrinth seals isolate bearingsfrom contamination to improve durability.Other seals available.

Optimum shaft size to transmit loadsand maximize sealing flexibility.

Extreme Duty bearingsexpand the operatingrange to include severeduty applications.

Large oil sump capacity to provide maximumcooling and increase bearing life.

Bearings designed for long life. Bearingseats are ground to provide a precise fit.

4

Standard labyrinth seal

Pump Running/Seal Open

Pump Off/Seal Closed

DryLock® Features

The DryLock® uses the action ofcentrifugal force combined with thesmooth actuation of ball bearings toopen and close the seal. As thepump starts up, the expellerevacuates the liquid in the sealarea. The balls of the DryLock® areforced outward and slide up a rampcreated by the ball housing. Theramp forces the balls into theactuator plate and opens the sealfaces. Upon shut-down, the ballslose their centrifugal force allowingthe spring-loaded actuator plate tomove back into its closed position.The seal is then closed.

Wilfley DryLock® Seal

Symmetricalactivationmechanism.

Positive seal atshutdowntightens withpressure.

Multiple sealface materialsavailable.

Simple replaceableparts.

No rubbing components.

Hook sleeve designfor maximum shaftprotection.

Isolated spring forreliable seal action.

Seal activation can easily bechanged to open and closeat different speeds simply byadding or subtracting balls.

Actuator Assembly

5

Wilfley Options Seal

6

Drylock/Labyrinth BackupFor Light Slurry Services

Mechanical Seal

Diaphram Seal

Extreme Temperature Seal

Expeller/Packing

Carbon Drylock/Vapor Barrier

Model A7 Pump Capacities

7

60 cycle performance

100

200

300

400

700

600

500

AA-81x1.5-8

A20-133x1.5-13

A06-102x1-10

100FLOW (GPM)

HE

AD

(FT

)

3550 RPM

10 100001000

AB-63x1.5-6

A50-103x1.5-10

A50-83x1.5-8

A30-13 3x2-13

A70-84x3-8

A60-83x2-8

A60-103x2-10

AA-61.5x1-6

A70-104x3-10

20

40

60

80

100A110-16 8x6-16S

A80-106x4-10

A110-158x6-15

A120-1510x8-15

A120-1610x8-16S

100FLOW (GPM)

HE

AD

(FT

)

1150 RPM

1 10 100001000

A20-133x1.5-13

A70-104x3-10

A80-136x4-13

A30-133x2-13

A40-134x3-13

A50-103x1.5-10

A60-103x2-10

A05-102x1-10

60

110

160

210A110-16 8x6-16S

AA-8 1x1.5-8

AA-6 1.5x1-6

A20-133x1.5-13

A06-10 2x1-10A110-158x6-15

A120-1510x8-15

A120-1610x8-16S

100FLOW (GPM)

HE

AD

(FT

)

1750 RPM

10 100001000

A50-83x1.5-8

AB-6 3x1.5-6

A70-104x3-10

A80-106x4-10

A60-8 3x2-8A70-84x3-8

A80-136x4-13

A30-133x2-13

A40-134x3-13

A50-103x1.5-10

A60-103x2-10

8

10

30

50

70

90

110

130

150

170

AA-8 1x1.5-8

AA-6 1.5x1-6

A20-133x1.5-13

A06-102x1-10

100FLOW (M3/HR)

HE

AD

(M)

2950 RPM

1 10 1000

A50-103x1.5-10

AB-63x1.5-6

A70-84x3-8A60-8 3x2-8

A70-104x3-10

A80-106x4-10

A30-133x2-13

A40-134x3-13

A50-83x1.5-8

A60-103x2-10

50 cycle performance

10

20

30

40

50

A110-16 8x6-16S

AA-8 1x1.5-8

AA-6 1.5x1-6

A20-133x1.5-13

A06-102x1-10

A110-158x6-15

A120-1510x8-15

A120-1610x8-16S

100FLOW (M3/HR)

HE

AD

(M)

1450 RPM

1 10 100001000

A50-83x1.5-8

AB-63x1.5-6

A70-104x3-10

A80-106x4-10

A60-8 3x2-8

A70-84x3-8

A80-136x4-13

A30-133x2-13

A40-134x3-13

A50-103x1.5-10

A60-103x2-10

Materials

Item Number

11a34

141517

6161a61b6262a62b62c677272a72b73757679

Wet End ItemName

CasingCap ScrewGasket, CasingLockwasherImpellerCasing PlateExpeller

FrameBreatherDrain PlugShaftBearing, InboardBearing, OutboardLocknutOil Seal, InboardBearing CarrierO-ring, Bearing CarrierJam NutRetaining RingCap ScrewOil Seal, OutboardSight Glass

DryLock®

Alloy 20

A2018-8

Teflon®

18-8A20A20A20

DI**MS

SteelWMS*SteelSteelSteel

Teflon®

DI**Viton®

18-8Steel18-8

Teflon®

18-8

A20

Material316SS

316SS18-8

Teflon®

18-8316S316S316S

DI**MS

SteelWMS*SteelSteelSteel

Teflon®

DI**Viton®

18-8Steel18-8

Teflon®

18-8

316SS

WCD4™

WCD4™

18-8Teflon®

18-8WCD4™

WCD4™

WCD4™

DI**MS

SteelWMS*SteelSteelSteel

Teflon®

DI**Viton®

18-8Steel18-8

Teflon®

18-8

WCD4™

Ductile Iron

DI**18-8

Teflon®

18-8DI**DI**DI**

DI**MS

SteelWMS*SteelSteelSteel

Teflon®

DI**Viton®

18-8Steel18-8

Teflon®

18-8

DI**

Power End

Seals

Materials

AR Wilfley & Sons produces Model A7centrifugal pumps in a variety ofmaterials to meet a wide variety ofpumping conditions.

Model A7 pumps have beenmanufactured in ductile iron, duplex,stainless steel, Hastelloys, hard irons,and a variety of austenitic stainlesssteels including; Alloy 20 (CN7M) 304L(CF3), 316L (CF3M).

Wifley's Engineering Staff has theknowledge and experience to assistyou in material selection. Wilfleymaintains an extensive library of pumping services andcorrosion/abrasion data. Wilfleycontinually tests the effects ofabrasion and corrosion on a widevariety of materials.

Wilfley's in-house metallurgicalresources have developed uniquematerials to survive in the most hostileenvironments. These proprietarymaterials were developed to extendthe erosion - corrosion performanceand reliability of the A7 pump underextreme conditions.

WCD4 – Wilfley improved CD4MCuduplex stainless steel offering a 40%higher hardness, 42% increase intensile strength, 65% increase in yieldstrength, resulting in a lower wear rateand higher corrosion resistance thanthe industry standard CD4MCu.

Maxalloy 5 – is a high chrome whiteiron providing a material hardness up to 650 HBN and 4 to 9.5 pHoperating range.

Maxalloy 8 – is a proprietary highchrome white iron providing 450-520HBN hardness, able to withstandchemical deterioration within a 1.3 to13.2 pH range.

To assist with proper materialselection, Wilfley can provide materialcoupons for testing in your particularapplication followed by a materialdeterioration analysis report.

* WMS – hardened steel** DI – ductile iron

9

14 17 15 67 62a 61 61a 62

62b 62c 72b 75

72

76

72a

75

4

73

7961b1a413

10

Model A7 Options and Engineering Specials

Features Options Engineered Specials

Bearings – single row Extreme duty bearingsSingle row deep groove – inboard bearingDuplex angular contact – outboard

Oil lubricated bearings Grease, oil mist, constant level oiler

Labyrinth bearing seal Magnetic Bearing SealOil Filter

Frame and bearing carrier material: 316SS Corrosion resistant alloysDuctile iron

Frame with large sight glass Sight glass on the opposite side oron the right side when viewed on both sidesfrom coupling end. Oil cooling provisions

O-Ring material: Viton Kalrez®

Teflon® encapsulated

Wet end material: DI, 316SS, A20, 1/2" NPT connection for case drain 1/4" NPT connection for gaugeWCD4™, High Nichol Alloy, Max5/Ma8 Steam jackets Alloys – special order

150 lbs. raised faced flanges 300 lbs raised faced flanges

DryLock® seal PackingMechanical seal

Labyrinth seal Lube seal

Flush connections for seals Flushing hardwareExpeller cavity drain

Special Modifications

A.R. Wilfley & Sons is dedicated tomanufacturing pumps that maximizetheir full potential. Wilfley routinelyaccommodates customer requestsfor steam jackets, special paint,flush ports, special drain plugs andother modifications required to fitspecific needs.

Many applications require specialmotor and drive configurations,including baseplates and mountingbrackets. Non-metallic andfabricated baseplates are available.

Wilfley engineers assist in anyspecial configurations that the liquidand process require. Wilfley’sfamous high-quality workmanshipapplies to all special designs tocustomers’ needs.

11

Construction Details

12

Frame 1 Frame 2 Frame 3 Frame 4

AA-6 AB-6 AA-8 A5O-8 A60-8 A70-8 A05-10 A50-10 A60-10 A70-10 A80-10 A20-13 A30-13 A40-13 A80-13 A110-15 A120-15General

Pump weight 137lbs 167 152 371 375 411 420 468 473 492 549 478 490 528 574 1090 120762 kg 76 69 168 170 186 191 212 215 223 249 217 222 240 260 494 547

Max. working* 250 °F 250 250 250temperature 120 °C 120 120 120

Max. working 200 psi 200 200 200pressure 675 kPa 675 675 675

Max. solids size 3/16 in. 1/4 5/16 1/4 1/4 3/8 1/4 3/8 3/8 3/8 3/8 1/4 3/8 3/8 3/8 1/2 1/25 mm 6 8 6 6 10 6 10 10 10 10 6 10 10 10 13 13

Shaft

Diameter at .75 in. 1 1.125 2.125Impeller 19 mm 25.4 28.6 53.9

Diameter at 1.375 in. 1.375 1.875 2.123Sleeve 34.9 mm 34.9 47.6 53.9

Diameter at .875 in. 1.125 1.125 2.375Coupling 22.2 mm 28.5 28.5 60.3

Diameter 1.94 in. 2.5 2.84 4.41between 49.3 mm 63.5 72.1 112bearings

Shaft 6.413 in. 6.85 7.79 10.21overhang 162.9 mm 173.9 197.9 259.3

Bearing span 3.175 in. 7.71 6.63 9.9980.6 mm 195.8 168.4 253.7

Bearings

Standard radial 6308 6311 6312 6319Abearing

Standard thrust 5208A 5211A 5312 7319BECBbearing

Extreme duty 6308 311M 312M NU319ECradial bearing

Extreme duty 7308BECB 7310BECB 7312BECB 7319BECBthrust bearing

*Modified seal configurations are available for special pumping conditions up to 400º F.

Dimensions

The dimensions listed above conformto ASME B73.1 specifications andapply to fabricated and non-metallicbase plates only. dimensions aredifferent for iron bases.

These dimensions are not forconstruction. Certified dimensionprints are available for your specificinstallation.

All dimensions printed in black are ininches and those in red are theapproximate equivalent in millimeters.

Flanges are drilled to match ASMEB16.5 150lbs.

13

Pump

Group

1

2

3

Size, Suction X Discharge XNominal Impeller Diameter

1.5 X 1 X 6 (40 X 25 X 150)3 X 1.5 X 6 (80 X 40 X 150)1.5 X 1 X 8 (40 X 25 X 200)

3 X 1.5 X 8 (80 X 40 X 200)3 X 2 X 8 (80 X 50 X 200)

4 X 3 X 8 (100 X 80 X 200)

2 X 1 X 10 (50 X 25 X 250)3 X 1.5 X 10 (80 X 40 X 250)3 X 2 X 10 (80 X 50 X 250)

4 X 3 X 10 (100 X 80 X 250)6 X 4 X 10 (150 X 100 X 250)

3 X 1.5 X 13 (80 X 40 X 330)3 X 2 13 (80 X 50 X 330)

4 X 3 X 13 (100 X 80 X 330)6 X 4 X 13 (150 X 100 X 330)

8 X 6 X 15 (200 X 150 X 380)10 X 8 X 15 (250 X 200 X 380)

Nema

143T - 184T213T-256T

284TS - 326TS

143T - 184T213T - 215T254T - 286T

324TS - 365T404T - 405TS405T - 447TS

284T - 286T324T - 405T

444T - 449TS

IEC

80M - 90L132M - 160L180M - 180L

100L - 132M160M 180L

200L225S - 225M

250M280S 280M

180L200L - 250M280S - 315L

DimensionDesignation

AAABAA

A50A60A70

A05A50A60A70A80

A20A30A40A80

A110A120

BaseplateNumber

139148153

245252258264268280

368380398

Motor Frame RangePump Dimensions

CP

17.5 (445)17.5 (445)17.5 (445)

23.5 (597)23.5 (597)23.5 (597)

23.5 (597)23.5 (597)23.5 (597)23.5 (597)23.5 (597)

23.5 (597)23.5 (597)23.5 (597)23.5 (597)

33.875 (860)33.875 (860)

D

5.25 (133)5.25 (133)5.25 (133)

8.25 (210)8.25 (210)8.25 (210)

10 (254)10 (254)10 (254)10 (254)10 (254)

10 (254)10 (254)10 (254)10 (254)

14.5 (368)14.5 (368)

X

6.5 (165)6.5 (165)6.5 (165)

8.5 (216)9.5 (242)11 (280)

8.5 (216)8.5 (216)9.5 (242)11 (280)

13.5 (343)

10.5 (266)11.5 (292)12.5 (318)13.5 (343)

18 (457)19 (483)

Y

4 (102)4 (102)4 (102)

4 (102)4 (102)4 (102)

4 (102)4 (102)4 (102)4 (102)4 (102)

4 (102)4 (102)4 (102)4 (102)

6 (152)6 (152)

General Installation Recommendations

Choosing Pump Location

Locate the pump as close to theliquid source as practical so thesuction pipe is short and direct with a minimum of elbows, fittings and valves.

Place the pump in a location so theunit is accessible for inspectionduring operation as well as formaintenance operations involvingremoval and disassembly.

Foundation

The foundation should be strongenough to absorb any vibration andto form a permanent support for thebaseplate. This is important inmaintaining the alignment of thedirect connected unit. Foundationbolts of the proper size should beembedded in the concrete locatedby the outline drawing.

Alignment

The pump and motor are aligned atthe factory before shipment.However, realignment is necessary

after the complete unit has beeninstalled. Guidelines for checkingand aligning the pump componentsmay be found in the HydraulicInstitute Standards.

Piping

Both suction and discharge pipesshould be supported independentlynear the pump so when the flangebolts are tightened no strain will betransmitted to the casing.

A check valve should be beinstalled in the discharge line toprevent fluid from flowing backthrough the pump while it is shutdown. Gate valves should beinstalled in both discharge andsuction lines to isolate the pumpduring maintenance.

Care must be taken in sizing andlocating suction piping to preventcavitation.

Ordering Information

Wilfley pumps are engineered tooperate in compliance with your

14

HA

15 (381)18 (457)21 (533)

15 (381)18 (457)21 (533)21 (533)26 (660)26 (660)

26 (660)26 (660)26 (660)

HB

39 (991)48 (1219)53 (1346)

45 (1143)52 (1321)58 (1473)64 (1626)68 (1727)80 (2032)

68 (1727)80 (2032)98 (2489)

HE

4.5 (114)6 (152)

7.5 (191)

4.5 (114)6 (152)

7.5 (191)7.5 (191)9.5 (241)9.5 (241)

9.5 (241)9.5 (241)9.5 (241)

HF

36.5 (927)45.5 (1156)50.5 (1283)

42.5 (1080)49.5 (1257)55.5 (1410)61.5 (1562)65.5 (1664)77.5 (1969)

65.5 (1664)77.5 (1969)95.5 (2426)

HG

3.75 (95)4.13 (105)4.75 (121)

3.75 (95)4.13 (105)4.75 (121)4.75 (121)4.75 (121)4.75 (121)

4.75 (121)4.75 (121)4.75 (121)

HH

.75 (19)

.75 (19)

.75 (19)

.75 (19)

.75 (19)1.00 (25)1.00 (25)1.00 (25)1.00 (25)

1.00 (25)1.00 (25)1.00 (25)

HL

4.5 (114)4.5 (114)4.5 (114)

4.5 (114)4.5 (114)4.5 (114)4.5 (114)4.5 (114)4.5 (114)

6.5 (165)6.5 (165)6.5 (165)

HP

1.25 (32)1.25 (32)1.25 (32)

1.25 (32)1.25 (32)1.25 (32)1.25 (32)1.25 (32)1.25 (32)

1.25 (32)1.25 (32)1.25 (32)

9 (229)10.5 (267)

12.88 (327)

12 (305)12.38 (314)

13 (330)13.88 (353)14.88 (378)15.88 (403)

19.25 (489)19.25 (489)19.25 (489)

13.75 (349)14.13 (359)14.75 (375)14.75 (375)14.88 (378)15.88 (403)

HD

Frame 2 Frame 3(and 6x4x10)

specifications. Careful evaluation ofpumping conditions is needed toprovide accurate pumprecommendations and quotations.

This list will help establish specificpumping system conditions.

• Liquid

• Temperature

• Static Head

• Discharge Pipe Size

• Length, Discharge Pipe

• Discharge Pipe Fittings

• Equivalent Length Discharge Pipe

• Total Head

• Maximum Suction Pressure

• Minimum Suction Pressure

• Capacity

• Specific Gravity

• % Solids by Weight

• Mesh Analysis

• Viscosity

• NPSH Available

A7T02-LM

A.R. Wilfley & Sons, Inc.

P.O. Box 2330

Denver, Colorado 80201

303/779-1777

1-800-525-9930

FAX 303/779-1277

www.wilfley.com