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Durco Mark 3ASME B73.1 Pump -Sales GuideNote: This sales guide is not meant to be all-inclusive.For more information, please refer to:

Mark 3 Technical Bulletin (P-10-501)•Mark 3 Sales Bulletin (PS-10-13)•Mark 3 IOM (71569102)•

Seal ChambersFeatures Benefits

Advanced SealSentryDesign Technology

Extends seal life: Self-flushing/venting/draining•Reduces maintenance and repair costs•Provides safer environment for personnel•

Oversized Bore Preferred option (FML, CBL type)•

Flow Modifiers (FM)

Extend mechanical seal MTBPM•Act as “Speed Bumps”•

Redirect flow from circumferential to axial•

Handle high solid levels•Can reduce/eliminate costly seal support systems•Come in three configurations (FML, FMS, FMI)•

Cylindrical Bore (CB) Available in two configurations (CBL, CBS)•

Optional Jacketed SealChambers

Designed for effective heat transfer in the seal chamber area or•across entire surface area of process fluid

FPD-1314a (E) Printed in USA. June 2010. © Flowserve Corporation

Reverse Vane (RV) Impeller

Features Benefits

True back pull-out design

In-shop impeller clearance adjustment•Shortens maintenance times•

Prevents guesstimates used in bench settings•

Clearance set between impeller and rear cover (allows for•both shop & field adjustment)

Low resultant seal chamberpressures

Maximizes seal life and reduces seal drag as compared to•open vane impellers

Rear cover is primary wearsurface

Eliminates need to replace expensive casing. Re-machining•of cover renews hydraulic performance.

Pressure balancing holesbetween rear surface andeye area

Reduces thrust loads on outboard bearing to maximize•bearing lifeFlow reduces temp. within oversized seal chambers•

Smooth, long radiusflow path Minimizes turbulence and lowers NPSHR

•

Precision-cast vane profiles Minimizes pressure drop and lowers NPSHR•

Assures hydraulic performance repeatability & predictability•

Large flow passages Improves ability to pass solids w/o clogging•

Primary Features and Benefits

USA and CanadaFlowserve Corporation5215 North O’Connor Blvd.Suite 2300Irving, Texas 75039-5421 USATelephone: 1 937 890 5839

Europe, Middle East, AfricaFlowserve CorporationGebouw HagepointWestbroek 39-514822 ZX BredaNetherlandsTelephone: 31 76 502 8920

Latin AmericaFlowserve CorporationMartín Rodriguez 4460B1644CGN-Victoria-SanFernandoBuenos Aires, ArgentinaTelephone: 54 11 4006 8700Telefax: 54 11 4714 1610

Asia PacificFlowserve Pte. Ltd.10 Tuas LoopSingapore 637345Telephone: 65 6771 0600Telefax: 65 6779 4607

For Internal Use Only

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Reference TablesTable 1 – Mark 3 Shaft Comparisons to Competitors

Ø at Cplg. Ø at Seal Radial Brg Thrust Brg L3 /D4 HP LimitGP1 - Competitor 0.875 1.375 6207 3306 64 40GP1 Mark 3 0.875 1.375 6207 3306 59 40GP2 - Competitor 1.125 1.750 6309 3309 63 122GP2 Mark 3 1.125 1.875 6310 3310 37 150GP2 HD - Competitor 1.875 2.125 6311 7310 29 200GP2 OSV Mark 3 1.500 1.875 6310 7310 37 175GP2 HD Mark 3 1.500 2.125 NUP2212 7310 23 175GP3 - Competitor 2.375 2.500 6313 3316 25 356

GP3 Mark 3 2.375 2.625 6314 3314 23 325GP3 HD Mark 3 2.375 3.000 NUP217 7316 13 500

1. Highlighted rows indicate major competitor values 2. HD Indicates heavy-duty shaft option through seal chamber3. OSV indicates oversize shaft at coupling end

Bearing Housing

Features BenefitsMicrometer typeShaft/impeller adjustment

Simple, accurate design (only 0.004 in movement notch-to-notch)•Speeds overhauls and in-field adjustments•

Calibrated bearing carriers Allows settings to be accomplished w/o feeler gauges•

Unique threaded carrierdesign Prevents bearing side loading, ensuring maximum service life

•

Top vented breather Simple, quick access for oil addition•

Baffled breather allows exchange of air in/out of housing while•keeping contaminants out

Primary Features and Benefits Cont’d

2 K 6 X 4 M – 13 A / 12.5 RV

2 indicates a medium size pump

frame – in this example, a Group 2 1 = Group 1 (small frame) 2 = Group 2 (medium frame) 3 = Group 3 (large frame)K = Mark 3 style power endJ = Mark 3 style PE arranged for

Mark 2 wet end on Group 1No letter and no preceding number indicates a Mark 2 power endNominal suction port sizeNominal discharge port sizeModifier for “specialty pumps” blank or no letter = Standard pump M = Sealmatic L = Non-metallic wet end R = Recessed impeller H = High silicon iron US = Unitized self-priming S = Old style self-priming V = Vertical in-line T = PFA lined wet end LF = Lo-Flo E = Durcon wet endNominal maximum impeller diameter 13 = 13 inchPump design variation A = This pump has been redesigned from an earlier

version. The impeller and casing are no longerinterchangeable with the earlier version.

H = This pump is designed for a higher flow capacitythan another pump with the same basic designation.

Examples: 4X3-10 and 4X3-10H; 6X4-10 and 6X4-10H; 10X8-16 and 10X8-16H. In each case the pump withthe “H” is designed for a higher flow capacity.

HH =This pump is designed for a higher head than another pump with the same basic designation.Example: 4X3-13 and 4X3-13HH

l ll

Table 2 – Pump Designation

Durco Mark 3 ASME B73.1 Pump - Sales Guide

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Type AStandard ANSI baseplate;foundation or limited stressstilt mounted.

Type BPolybase™ baseplate;foundation or stilt mounted.

Type CReinforced baseplate;stilt mounted.

Type DReinforced baseplate;foundation mounted; withoptional drip rim.

Type EHeavy-duty, foundationmounted baseplate; complieswith PIP RESP 002.

Available Baseplate Options

Available OptionsOptional ANSI 3A Power End

Features BenefitsCarries lifetime warranty End-user peace of mind•

Clean room assembly Reduces contamination risks•

Inpro VBXX-D bearing isolators Keeps lubricants in and contaminants out•

Larger Sloping (Inclined) Oil sumpw/ Magnetic Drain Plug

Collects metallic contaminants•Helps oil run -12°C (10°F) cooler (benefit to larger sloping)•Larger oil return lines (benefit to larger sloping)•

Experience In Motion flowserve.com

Available Mark 3 Variations

Designation DescriptionLo-Flo Low Flow / High Head Applications•

Sealmatic Utilizes a dynamically sealing repeller (expeller) to expel fluid from•

sealing chamber, eliminating need for mechanical seal

Unitized Self-Priming Draws from liquid sources below ground level or from sources with•

no positive pressure to naturally prime the pumpRecessed Impeller Ideal for solid, stringy or fibrous slurries•

In-line Space-saving vertical in-line design•

PolyChemAvailable with a fluoropolymer lining for both sealed (S-Model) and•sealless (M-Model) versions, as well as an engineered composite

(GRP Model) made of premium fiberglass vinylester materialESP3 Vertical sump pump design•

Note: All baseplates are fully compliantwith ASME B73.1 dimensions

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Responses to Typical CompetitorClaims & FeaturesNote: The claims made below are typical ofGoulds, Sulzer and other knock-off manufacturerssuch as Peerless, Griswold and Summit. Thecorresponding responses below are Flowserve

rebuttals to those claims.False Claim #1Open Impellers provide 2x more wear areaequaling longer life & reduced repair costs

More working area being worn does not reduce•the wear rate – it just damages more partsAdjusting open impellers towards the casing•increases the thrust loads – causes sealchamber pressures to increaseCost to replace a rear cover is much lower•than a casingRear covers are much easier to replace than•a casingMark 3’s reverse vane impeller has balance•holes to ensure hydraulic loads are similar inmagnitude to open impellers* Mark 3 has an open impeller available

if required

False Claim #2Enclosed Impellers cannot be adjusted (Figure 1)

Mark 3’s reverse vane impellers are not fully•enclosed

These are easily adjusted using micrometer–adjustment

Nose ring repair does not affect performance•until it is almost goneMark 3’s reverse vane impeller only requires•

one adjustment for performance and sealchamber pressure renewal

False Claim #3 Open Impeller back pump-out vanes controlaxial thrust (Figure 2)

Goulds’ and similar competitors’ back pump-•out vanes wear and become less effective atcontrolling thrust loading and seal chamber

pressure over timePump-out vane wear combined with moving•the impeller away from the rear cover for“performance renewal” means that significantpressure increase occurs behind thecompetitor’s open impeller which adds to thethrust loads and seal chamber pressure

Mark 3 vs. Sulzer’s CPTSame semi-open impeller design as Goulds•

Drawbacks the same as Goulds• Introduced in 1996. Mark 3 has been in service•since the mid-1980sSeal chambers were copies of the Mark 3 FM•Micrometer impeller adjustment copied•

Only the OB bearing capture method–is different

Inferior bearing design•I.B. bearing is roller bearing, not ball (where–radial loads are low - not recommendedby SKF)

Reverse VaneImpeller Adjustment

Only OneTolerance: ImpellerVane To Cover

Front VaneImpeller Adjustment

Pump -Out Vanes

Pump PerformanceVanes

Reverse Vane ImpellerConsistent, Like-New Repeatable Performance

ThrustOriginal

Axial Thrust

OriginalChamberPressure

Seal Chamber Pressure

Cycles Repart

Effects of Wear & Impeller Readjustment

S e a

l C h a m

b e r

P r e s s u r e

/ A x i a l

T h r u s t

OriginalAxial Thrust

OriginalChamberPressure

Cycles Repart

Effects of Wear & Impeller Readjustment

Seal Chamber Pressure

Thrust

Diminished PerformanceFront Vane Open Style Impeller

S e a

l C h a m

b e r

P r e s

s u r e

/ A x i a l

T h r u s t

Figure 1

Figure 2

Experience In Motion flowserve.com