Download - Sealing Piping Plan(API&ANSI)
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Flow Solutions
Mechanical Seal Piping Pla
Single Seals plans 01, 02, 11, 13, 14, 21, 23, 31, 32, 4
Dual Seals plans 52, 53A, 53B, 53C, 54
Quench Seals plan 62
Gas Seals plans 72, 74, 75, 76
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Flowserve’s Flow Solutions Division recognizes one of the most effective ways to
achieve long, uninterrupted mechanical seal life is to create a healthyenvironment around the seal faces. Piping plans help keep mechanical sealsrunning cool and clean, promote safe handling of dangerous fluids, and extend
the operational availability of rotating equipment. This reference book is intendedto provide a concise summary of the most essential piping plans used
successfully in today’s process plants.
Each plan shows all the standard and optional auxiliary components referencedin API Standard 682 2nd edition although not all components are needed in all
applications. Consult your local Flowserve Flow Solutions Sales Engineer toidentify the right solution that satisfies your application requirements.
M echanical Seal Piping Plans
printed in USA © 2003 Flowserve Corporation
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For each piping plan identified in API Standard 682 2nd edition and recommended
Flowserve, each page set of this book shows:
Seal End View Piping Plan Layout What, Why, and Wher
Pump Cross-section Mechanical Seal
outlet
inlet
pressure source,normally open
pressure gage
pressure switch
level switch (high)
level switch (low)
cooling in
cooling coils
drain,normally closed
level gage
cooling out
reservoir
liquid fill,normally closed
Flow Solutions Division
What• Pressurized barrier fluid circulation through reservoir.• Fluid is circulated by a pumping ring in the dual seal assembly.
Why• Isolate process fluid.• Zero process emissions.
Where• Used with dual pressurized seals (Arrangement 3 or “double”).• High vapor pressure fluids, light hydrocarbons.• Hazardous/toxic fluids.• Heat transfer fluids.• Dirty/abrasive or polymerizing fluids.• Mixers/agitators and vacuum service.
Presventative Maintenance - Reference Appendix A• Piping loop must self-vent to reservoir locate at highest elevation.• Reservoir must be pressurized at all times - typically gas charge up to 200 psi (14bar).• Barrier fluid must be compatible with process.• Reservoir level gage indicates both inboard and outboard seal leakage.
P l a n
5 3 A
P l a n
5 3 A
sealend view
Preventative Maintenance
• Viewed from drive end
• Shows preferred glandconnection orientation
• Illustrated schematic
of auxiliary components
• Describes piping pla
their purpose, andtypical applications
• Simplified centrifugalpump shown for all
plans
• Shows typical sealarrangements
• Provides general tips toimprove reliability and fo
troubleshooting
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Pla
n
01
sealend view
internal porting
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Flow Solutions Divisio
WhatInternal seal chamber flush from pump discharge.Operates similar to Plan 11.
WhySeal chamber heat removal.Seal chamber venting on horizontal pumps.Reduce risk of freezing/polymerizing fluid in exposed Plan 11 piping.
WhereCustom seal chamber, most likely an ANSI/ASME pump.
Clean, moderate temperature fluids.Used with single seals, rarely with dual seals.
Preventative MaintenanceFlush typically can not be directed over seal faces and seal heat removal is limitedCalculate flush flow rate based on head loss through internal porting.
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Pla
n
02
sealend view
open throat seal chamber shown
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Flow Solutions Divisio
WhatDead-ended seal chamber with no flush.
WhySimplicity - no environmental controls.
WhereLarge bore/open throat seal chambers in moderate temperature services.Cooling jacket seal chambers in high temperature services.Clean fluids.Top-entry mixers/agitators with dry seals.
Preventative MaintenanceProcess must have adequate boiling point margin to avoid vaporization.Cooling fluid in seal chamber jacket may be needed at all times in hot services.Often used in combination with steam quench, Plan 62.
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Flow Solutions Divisio
WhatSeal flush from pump discharge through orifice.Default single seal flush plan.
WhySeal chamber heat removal.Seal chamber venting on horizontal pumps.Increase seal chamber pressure and fluid vapor margin.
WhereGeneral applications with clean fluids.
Clean, non-polymerizing fluids.
Preventative MaintenanceUse an orifice with a minimum 0.125" (3 mm) diameter.Calculate flow rates to size orifice for adequate seal chamber flow.Increase boiling point margin with proper orifice and throat bushing sizing.Flush should be directed over seal faces with piping at 12 O’clock position.Typical failure mode is a clogged orifice - check temperatures at pipe ends.
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Pla
n
13
sealend view
outlet
orifice
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Flow Solutions Divisio
WhatRecirculation from seal chamber to pump suction through orifice.Standard flush plan on vertical pumps.
WhyContinuous seal chamber venting on vertical pumps.Seal chamber heat removal.
WhereVertical pumps.Seal chamber pressure is greater than suction pressure.
Moderate temperature fluids with moderate solids.Non-polymerizing fluids.
Preventative MaintenanceVent piping loop prior to starting vertical pumps.Use an orifice with a minimum 0.125" (3 mm) diameter.Calculate flow rates to size orifice for adequate seal chamber flow.Reduce seal chamber pressure with proper orifice and throat bushing sizing.
Typical failure mode is a clogged orifice - check temperatures at pipe ends.
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Pla
n
14
sealend view
orifices
outlet
inlet
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Flow Solutions Divisio
WhatSeal flush from pump discharge and recirculation to pump suction with orifices.Combination of Plan 11 and Plan 13.
WhyContinuous seal chamber venting on vertical pumps.Seal chamber heat removal.Increase seal chamber pressure and fluid vapor margin.
WhereVertical pumps.
Clean, non-polymerizing fluids at moderate temperatures.
Preventative MaintenanceUse an orifice with a minimum 0.125" (3 mm) diameter.Calculate flow rates to size orifice for adequate seal chamber flow.Increase boiling point margin with proper orifice and throat bushing sizing.Flush should be directed over seal faces.Vent piping loop prior to starting vertical pumps.
Typical failure mode is a clogged orifice - check temperatures at pipe ends.
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Pla
n
21
sealend view
drain,normallyclosed
inlet
vents,normally closed
cooling in
cooler
cooling out
orifice
cooling coils
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Flow Solutions Divisio
WhatSeal flush from pump discharge through orifice and cooler.Cooler in Plan 11 flush increases heat removal.
WhySeal cooling.Reduce fluid temperature to increase fluid vapor margin.Reduce coking.
WhereHigh temperature service, typically less than 350° F (177° C).
Hot water over 180° F (80
° C).Clean, non-polymerizing fluids.
Preventative MaintenanceSeal cooler and piping must have air vents at highest elevation - vent before startinWhen using 682 Seal Cooler, pipe with series flow to maximize heat transfer.Use an orifice with a minimum 1/8" (3 mm) diameter.Calculate flow rates to size orifice for adequate seal chamber flow.
Increase boiling point margin with proper orifice and throat bushing sizing.Regularly monitor device inlet and outlet temperatures for signs of clogging or foulin
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Pla
n
23
sealend view
outlet
inlet
drain,normallyclosed
vent,
normally closed
cooling in
cooler
cooling out
cooling coils
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Flow Solutions Divisio
WhatSeal flush from internal pumping device through cooler.Standard flush plan in hot water services.
WhyEfficient seal cooling with low cooler duty.Increase fluid vapor margin.Improve water lubricity.
WhereHigh temperature service, hot hydrocarbons.
Boiler feed water and hot water over 180° F (80
° C).Clean, non-polymerizing fluids.
Preventative Maintenance - Reference Appendix ASeal cooler and piping must have air vents at highest elevation - vent before startinWhen using 682 Seal Cooler, pipe with parallel flow to minimize head loss.Seal chamber requires close clearance throat bushing to isolate process fluid.Tangential seal gland taps should enter at bottom and exit at top.
Regularly monitor cooler inlet and outlet temperatures for signs of plugging or foulinProcess fluids with iron should flow through magnetic separator before cooler.
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Pla
n
31
sealend view
inlet
cyclone separator
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Flow Solutions Divisio
WhatSeal flush from pump discharge through cyclone separator.Centrifuged solids are returned to pump suction.
WhySeal chamber heat removal.Solids removal from flush and seal chamber.
WhereDirty or contaminated fluids, water with sand or pipe slag.Non-polymerizing fluids.
Preventative MaintenanceCyclone separator works best on solids with a specific gravity twice the process fluiSeal chamber pressure must be nearly equal to suction pressure for proper flows.Piping should not include an orifice and is not expected to vent the seal chamber.Typical failure mode is clogged separator or pipes - check temperatures at pipe end
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Pla
n
32
sealend view
inlet
flow
meter
isolationvalvepressure
gage
checkvalve
from cleansource,
normallyopen
strainer
Fl S l ti Di i i
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Flow Solutions Divisio
WhatSeal flush from an external clean source.
WhySeal chamber heat removal.Process and solids removal from seal chamber.Increase seal chamber pressure and fluid vapor margin.
WhereDirty or contaminated fluids, paper pulp.High temperature service.
Polymerizing and/or oxidizing fluids.
Preventative MaintenanceUse throat bushing sized to hold pressure or maintain flow velocity.To restrict dirty process fluid, regulate injection flow rate.To increase fluid vapor margin, regulate injection pressure.Injection fluid must be compatible with process fluid.Regularly monitor control system for closed valves or signs of plugging.
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Pla
n
41
sealend view
inlet
drain,normallyclosed
vents,
normally closed
cooling in
cooler
cooling out
cooling coils
cycloneseparator
Flow Solutions Divisio
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Flow Solutions Divisio
WhatSeal flush from pump discharge through cyclone separator and cooler.Combination of Plan 21 and Plan 31.
WhySeal cooling.Solids removal from flush and seal chamber.
WhereHigh temperature service, typically less than 350° F (177° C).Dirty or contaminated fluids, water with sand or pipe slag.
Non-polymerizing fluids.
Preventative MaintenanceSeal cooler and piping must have air vents at highest elevation - vent before startinWhen using 682 Seal Cooler, pipe with series flow to maximize heat transfer.Cyclone separator works best on solids with a specific gravity twice the process fluiSeal chamber pressure must be nearly equal to suction pressure for proper flows.Typical failure mode is clogged separator or pipes - check temperatures at pipe end
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sealend view
Pla
n
52
outlet
inlet
drain,normally
closed
vent,normally open
cooling in
pressure gage
cooling out
cooling coils
reservoir
pressure switch
level gage
level switch (high)
level switch (low)
liquid fill,
normally closed
orifice
Flow Solutions Divisio
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Flow Solutions Divisio
WhatUnpressurized buffer fluid circulation through reservoir.Fluid is circulated by a pumping ring in the dual seal assembly.
WhyOutboard seal acts as a safety backup to the primary seal.Zero to very low process emissions.No process contamination is allowed.
WhereUsed with dual unpressurized seals (“tandem”).
High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.Heat transfer fluids.
Preventative Maintenance - Reference Appendix BPiping loop must self-vent to vapor recovery/flare system near atmospheric pressureProcess vapor pressure is generally greater than reservoir pressure.Buffer fluid must be compatible with process leakage.
Primary seal leakage is indicated by increased vent pressure.Reservoir level gage indicates outboard seal leakage.
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Pla
n
53A
seal
end view
outlet
inlet
pressure source,
normally open
pressure gage
pressure switch
level switch (high)
level switch (low)
cooling coils
cooling in
drain,normally
closed
cooling out
reservoir
liquid fill,
normally closedlevel gage
Flow Solutions Divisio
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Flow Solutions Divisio
WhatPressurized barrier fluid circulation through reservoir.Fluid is circulated by a pumping ring in the dual seal assembly.
WhyIsolate process fluid.Zero process emissions.
WhereUsed with dual pressurized seals (“double”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.Heat transfer fluids.Dirty/abrasive or polymerizing fluids.Mixers/agitators and vacuum service.
Preventative Maintenance - Reference Appendix BPiping loop must self-vent to reservoir located at highest elevation.Pressurize reservoir at all times, maximum gas charge 150 - 200 psi (10 - 14 bar).
Barrier fluid must be compatible with process.Reservoir level gage indicates both inboard and outboard seal leakage.
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Pla
n
53B
seal
end view
outlet
inlet
pressure source,normally closed
pressuregage
pressure switch
drain,normally
closed
liquid fill,normally closed
vent,normally closed
bladderaccumulator
finnedpipe
Flow Solutions Divisio
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Flow Solutions Divisio
WhatPressurized barrier fluid circulation with bladder accumulator.Fluid is circulated by a pumping ring in the dual seal assembly.
WhyIsolate process fluid.Zero process emissions.Higher pressure than Plan 53A.
WhereUsed with dual pressurized seals (“double”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.Heat transfer fluids.Dirty/abrasive or polymerizing fluids.
Preventative Maintenance - Reference Appendix BPiping loop must be fully vented before starting.Accumulator must be pressurized at all times, usually by gas charge.
Barrier fluid must be compatible with process.Regularly monitor barrier pressure - manually add barrier fluid when pressure deca
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Pla
n
53C
outlet
inlet
seal
end view
vent,
normally closed
pressure gagepressure switch
level switch (low)
cooling in
drain,normally
closed
cooling out
liquid fill,normally closed
level gage
cooling coils
Flow Solutions Divisio
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WhatPressurized barrier fluid circulation with piston accumulator.Fluid is circulated by a pumping ring in the dual seal assembly.
WhyIsolate process fluid.Zero process emissions.Higher pressure than Plan 53A.Dynamic tracking of system pressure.
WhereUsed with dual pressurized seals (“double”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.Heat transfer fluids.
Preventative Maintenance - Reference Appendix BPiping loop must be fully vented before starting.Reference line must tolerate process contamination without plugging.
Barrier fluid must be compatible with process.Reservoir level gage indicates both inboard and outboard seal leakage.
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Pla
n
54
sealend view
outlet
inlet
from / to external
circulating system
Flow Solutions Divisio
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WhatPressurized barrier fluid circulation by external system.
Why
Isolate process fluid.Zero process emissions.Seal cannot induce circulation.
WhereUsed with dual pressurized seals (“double”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.
Heat transfer fluids.Dirty/abrasive or polymerizing fluids.Mixers/agitators.
Preventative MaintenancePiping loop must be fully vented before starting.Circulating system must be pressurized and energized at all times.
Barrier fluid must be compatible with process.Circulating system level gage indicates both inboard and outboard seal leakage.
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Plan
62
sealend view
inlet
drain
pressuregage
steam trap(steam quench)
quench,
normallyopen
drain,normally
open
Flow Solutions Divisio
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WhatExternal quench on atmospheric side of seal.Quench fluids typically steam, nitrogen, or water.
WhyPrevent solids buildup on atmospheric side of seal.Prevent icing.
WhereUsed with single seals.Oxidizing fluids or fluids that coke, hot hydrocarbons.Crystallizing fluids or fluids that salt out.Caustic.Cold fluids less than 32° F (0° C).
Preventative MaintenanceQuench inlet should be on top of gland with outlet/drain on bottom.Quench pressure should be limited to 3 psi (0.2 bar) or less.Use throttle bushing on atmospheric side of seal to direct quench flow to seal drain
Monitor regularly, checking for closed valves, blocked lines, and steam trap conditi
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Plan
72
seal
end view
vent
drain
inlet
1
32
C
D
A B
E
FH
G
1 - drain2 - vent3 - gas inlet, normally open
4 - filter drain, normally closed
4A - filterB - regulatorC - orifice
D - flow meterE - flow switchF - pressure switch
G - pressure gageH - check valve
Flow Solutions Divisio
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WhatUnpressurized buffer gas control system.Containment seal support typically with nitrogen buffer gas.
WhyZero to very low process emissions.Safety backup to primary seal.
WhereUsed with dual unpressurized containment seals (“tandem”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.
Clean, non-polymerizing, non-oxidizing fluids.Used in combination with Plan 75 and/or Plan 76.
Preventative MaintenanceClean, reliable, low pressure gas must be supplied to seal at all times.Bottled gas supply is not recommended except as part of emergency backup systePrimary seal leakage is indicated by pressure in the vent line.
Vent or drain are usually connected to low pressure vapor recovery/flare system.
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Plan
74
sealend view
drain
inlet
1
3
2
C
D
A B
EF
G
1 - upset drain, normally closed
2 - gas inlet, normally open3 - filter drain, normally closed
A - filter
B - regulatorC - flow meterD - flow switch
E - pressure switch
F - pressure gageG - check valve
Flow Solutions Divisio
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WhatPressurized barrier gas control system.Gas seal support typically with nitrogen barrier gas.
WhyIsolate process fluid.Zero process emissions.
WhereUsed with dual pressurized gas seals (“double”).High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.
Services that do not tolerate liquid barrier seals.Clean, non-polymerizing fluids.Moderate temperature fluids.
Preventative MaintenanceClean, reliable, pressurized gas must be supplied to seal at all times.Barrier pressure is typically at least 25 psig (1.75 bar) above seal chamber pressurFlow meter indicates both inboard and outboard seal leakage.Bottled gas supply is not recommended except as part of emergency backup syste
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sealend view
Plan
75 drain
pressure switch
pressure gage
vent,normally
open
orifice
level switch (high)
drain,
normallyclosed
reservoir locatedbelow seal drain port
isloation
valve
levelgage
Flow Solutions Divisio
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WhatDrain from containment seal cavity to liquid collector and vapor recovery.
Why
Leakage collection for zero to very low process emissions.Safety indicator for primary seal.
WhereMay be used alone or with Plan 72 on containment seals.Fluids that condense at ambient temperature.High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.
Clean, non-polymerizing, non-oxidizing fluids.
Preventative MaintenanceCollection reservoir must be located below seal drain and downward-sloped piping.Continuously vent collection reservoir to low pressure vapor recovery/flare system.Drain collection reservoir to liquid recovery system as needed.Primary seal leakage is indicated by increased vent pressure.
Monitor regularly for liquid level, valve settings, and low vent pressure.
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Plan
76
sealend view
vent
drain
vent,normally
open
pressure gage
pressure switch
drain,normally
closed
drain,normallyclosed
orifice
Flow Solutions Divisio
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WhatVent from containment seal cavity to vapor recovery.
Why
Leakage collection for zero to very low process emissions.Safety indicator for primary seal.
WhereMay be used alone or with Plan 72 on containment seals.Fluids that do not condense at ambient temperature.High vapor pressure fluids, light hydrocarbons.Hazardous/toxic fluids.
Clean, non-polymerizing, non-oxidizing fluids.
Preventative MaintenanceContinuously vent to low pressure vapor recovery/flare system.Vent piping should include a condensate drain.Primary seal leakage is indicated by increased vent pressure.Monitor regularly for valve settings, blocked lines, and low vent pressure.
Good Piping Practices Single Seals - Plan 23 shown
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seal
side view
seal
end view
3 ft. (0.9 m) max
1.5 - 2 ft.(0.45 - 0.6 m)
Minimize line losses
Large diameter tubing
Upward sloping lines
Long radius bends
high point vent
low point drain
Vertical
Equipment
HorizontalEquipment
Ap
pendixA
Good Piping Practices Single Seals Plan 23 shown
Dual Seals - Plan 53A shown
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sealside view
sealend view
ua Sea s a 53 s o
4 ft. (1.2 m) max
low point drain
Vertical
Equipment
HorizontalEquipment
1.5 - 2 ft.(0.45 - 0.6 m)
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Ac
cessorie
s Airfin CoolersTM
Forced air or naturalconvection seal coolers.
Reservoirs
General duty andAPI 682 compliant
reservoirs.
Seal Cooler
Compact designdual coil seal
cooler
Plans 21, 23 & 41 Plans 21, 23 & 41 Plans 21, 23 & 41
API 682
Seal Cooler
Seal cooler forcomplete API 682
specifications.
Plans 53, 53A & 53B
Flow Solution
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Circulator
Standalone dual sealsupport system.
Gas Ba
Control
Complete csystem for
seals.
Refill Cart
Mobile cart tomanually fill liquid
reservoirs.
Plan 54 Plans 52 & 53 Plans 72
Piston
Accumulator
Hydraulically chargedreservoir for dual
seals.
Plan 53C
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Ac
cessories
Orifice
Plug and platestyle flush line
orifices.
Magnetic Separator
Iron particle separatorfor seal flush.
Plans 11, 13, 14, & 21 Plans 31 & 41
Cyclone Separato
Solid particle separatoused in dirty flush
stream.
Plan 23
Seal Gard I & II
Combination flushflow regulator and
meter.
Plan 32
Flow Solution
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Gestra®
Steam Trap
Family of reliablesteam traps for
quench flows.
Bearing & BG
Bearing framprotection d
SLD
Quench lubricationdevice with
synthetic grease.
Plan 62 Plan 62 modified
DuraClear
Synthetic lubricantsfrom barrier fluid to
bearing oil.
Plans 52, 53 & 54
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No
tes
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No
tes
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Flow Solutions Division
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For your nearest Flow Solutions Division Service
and Sales location, look on the “Contact Us” page of
The information and specifications presented in these piping plans are believed to be accurate, but are supplied for information purposes only and should not be considered certified or as
guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, with respect to the product. Although Flowserv
Corporation can provide general application guidelines, it cannot provide specific information for all possible applications. The purchaser/user must therefore assume the ultimate responsibility f
the proper selection, installation, operation and maintenance of Flowserve products. Because Flowserve Corporation is continually improving and upgrading its product design, the specification
dimensions and inform ation contained herein are subject to change without noti ce.
Flowserve Corporation Flow Solutions DivisionPrimary Worldwide Flow Solutions Division Locations Licensees, authorized agents, and affiliated companies located worldw
GermanyBrazilMexico
Kalamazoo, MIPhone 269-381-2650Fax 269-382-8726
United States
RoosendaalPhone 31-165-581400Fax 31-165-552622
Netherlands
DortmundPhone 49-231-6964-0Fax 49-231-6964-248
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Phone 65-6-8465100Fax 65-6-747-1963
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Singapore Japan
Buenos AiresPhone 54-11-4709-6800Fax 54-11-4709-6800ext 123
Argentina AustraliaMarayong NSWPhone 61-2-8822-710Fax 61-2-9679-7511
Scarborough, OntarioPhone 416-292-2877Fax 416-292-5190
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