Gas Seal Course Customer 112003 01a

11© 2003 John Crane EAA

WelcomeWelcomeDry Running Non-Dry Running Non-Contacting Gas Contacting Gas

SealsSeals3-6 November 20033-6 November 2003

John Crane EAA Training Centre, Manchester, EnglandJohn Crane EAA Training Centre, Manchester, England

22

Introductions

Your name?Your name?

Where do you work?Where do you work?

How many years with your company?How many years with your company?

What do you do?What do you do?

Knowledge of Mechanical Seals?Knowledge of Mechanical Seals?

Any expectations or requirements?Any expectations or requirements?

33

International Customer Training Manager

John BlaberJohn Blaber

Mini-bus will pick us up from hotelMini-bus will pick us up from hotelatat

6.10 pm - 18.106.10 pm - 18.10

Mini-bus will pick us up from hotelMini-bus will pick us up from hotelatat

6.10 pm - 18.106.10 pm - 18.10

Tuesday EveningTuesday Evening

55

Wednesday Evening

Free, but pleased to Free, but pleased to organise something if organise something if

requiredrequired

66

Programme

Smiths & John CraneSmiths & John Crane Wet Seal Design & Wet Seal Design &

PrinciplesPrinciples Dry Gas PrinciplesDry Gas Principles Control and MonitoringControl and Monitoring Seal OperationSeal Operation Seal ConfigurationsSeal Configurations Transportation and Transportation and

StorageStorage Seal RefurbishmentSeal Refurbishment

Installation, Operation and Installation, Operation and

Maintenance ManualMaintenance Manual

Fitting ProcedureFitting Procedure

CommissioningCommissioning

Installing the SealInstalling the Seal

Assembly / DismantlingAssembly / Dismantling

Assessment / Test PaperAssessment / Test Paper

Remedial workRemedial work

Failure AnalysisFailure Analysis


Smiths Group Smiths Group plcplc

88

Smiths GroupSmiths Group established 4 established 4thth December December 2000 from merger of 2000 from merger of TI Group (1919)TI Group (1919) and and Smiths Industries (1851)Smiths Industries (1851)

Over 26,000 employees world-wideOver 26,000 employees world-wide

Over 450 manufacturing and customer Over 450 manufacturing and customer facilities in 47 countriesfacilities in 47 countries

Annual sales of £2.629 billionAnnual sales of £2.629 billion

Market Capitalisation Approx. £4.3 billionMarket Capitalisation Approx. £4.3 billion

All quoted figures are from 2003 Financial ReportAll quoted figures are from 2003 Financial Report

Over 12,000 employeesOver 12,000 employees£998 M£998 M

Over 1,500 employeesOver 1,500 employees

Detection Detection SystemsSystems

£273 M£273 M


MedicalMedical

£486 M£486 M

Over 10,000 employeesOver 10,000 employees£872 M£872 M

Speciality Speciality EngineeringEngineering

Aerospace

26,000+ Employees26,000+ Employees

- Core Businesses

John Crane International


£445 M£445 MMechanical Seals

Sealant Supply Systems

Flexible Couplings

Bearing Protectors

3D Modelling

Mechanical Seals

Sealant Supply Systems

Flexible Couplings

Bearing Protectors

3D Modelling

1111

John Crane International

9000 employees9000 employees

Operating in 47 countriesOperating in 47 countries

Over 1400 Sales & Application EngineersOver 1400 Sales & Application Engineers

Manufacturing in 17 countriesManufacturing in 17 countries

30 manufacturing sites30 manufacturing sites

Over 200 Service Centres.Over 200 Service Centres.

1212

John Crane: Product Size Range

Marine TechnologyMarine Technology8” - 56” / 200 - 1450 mm8” - 56” / 200 - 1450 mm

AutomotiveAutomotive3/8” - 5/8” : 9 - 16 mm3/8” - 5/8” : 9 - 16 mm

Process IndustriesProcess Industries1” - 9” : 25 - 230 mm1” - 9” : 25 - 230 mm

1313

History

John Crane founded in 1917 – Chicago, Illinois, USA

Crane Packing Limited established in Slough, England, UK, in 1923, by Frank Payne - the Company President.

Enlarged Berwick Avenue Works Enlarged Berwick Avenue Works Slough 1936Slough 1936

Frank PayneFrank Payne

1414

Major Historical Events

1917 - John Crane founded in USA1917 - John Crane founded in USA

1923 - John Crane UK subsidiary established1923 - John Crane UK subsidiary established

1947 - John Crane UK acquired by TI Group, UK1947 - John Crane UK acquired by TI Group, UK

1987 - John Crane USA acquired by TI Group, UK1987 - John Crane USA acquired by TI Group, UK

1988 - Ropac join John Crane Group1988 - Ropac join John Crane Group

1998 - Safematic join John Crane Group1998 - Safematic join John Crane Group

1998 - Sealol join John Crane Group1998 - Sealol join John Crane Group

1998 - Flexibox join John Crane Group.1998 - Flexibox join John Crane Group.

1515

Manufacturing Sites

= Dry Gas Seal Manufacturing= Dry Gas Seal Manufacturing and Reconditioningand Reconditioning

1616

Sales & Wet Seal Service Sites

1717

Sales and Service Sites

= New & Planned Dry Gas Seal Repair Centres= New & Planned Dry Gas Seal Repair Centres

1818

Mechanical Seals Market

John CraneJohn Crane 29%29%

*BW/IP*BW/IP 6%6%

Eagle/NOKEagle/NOK 9%9%

*Durametallic *Durametallic 8%8%

BurgmannBurgmann 6%6%

Chesterton Chesterton 4%4%

John CraneJohn CraneFlexibox 4%Flexibox 4%

OtherOther 14%14%

OtherOtherTechnologiesTechnologies

14%14%

'Others' include:-

Asia M Exacta Seal MerkelBeldam Freudenburg MetaxBestobel Garlock NashBT George Angus NDACanning GPM SafematicCartriseal Hecker Pac-sealLe Carbone Hoftland PetrisealChetra Huhnseal RoplanDae Sung James Walker SepcoDantec Klinger SimraxDepac Korean Seal SealtecDickow Latty TekhnisealErving Lowener Vulcan*Flowserve Group = 14%*Flowserve Group = 14%

John CraneJohn CraneSealol 6%Sealol 6%

1919

Centrifugal Gas Compressor

2020

Centrifugal Pumps

2121

Typical Pump

2222

Typical Pump - Sectioned

2323

Typical Pump - Sectioned

2424

Shaft Turning

Turn shafts of stored & standby equipmentTurn shafts of stored & standby equipment

Bearings - false BrinellingBearings - false Brinelling

Shaft sag - permanent setShaft sag - permanent set

Seal face wringingSeal face wringing

2525

Wringing


Basic Operation Basic Operation

Conventional “Wet” Conventional “Wet” Mechanical SealsMechanical Seals

2727

Basic Mechanical Seal

Loose ring set screwed to the shaftLoose ring set screwed to the shaft

2828


O-ring prevents leakage through the boreO-ring prevents leakage through the bore

Wear here will create leakageWear here will create leakage

2929


Spring ensures automatic adjustmentSpring ensures automatic adjustment

Heat generated hereHeat generated hereLeak pathLeak path

Large componentLarge component

3030


API Plan 2API Plan 2

Gasket or O-ringGasket or O-ring

Inserted stationary componentInserted stationary component

3131



3232



3333



3434



RecirculationRecirculationfor coolingfor cooling

3535

Seal Failure Analysis

3636

Seal Failure Analysis

3737


Secondary SealSecondary SealPrimary SealPrimary Seal

Tertiary SealTertiary Seal

3838


Spring or Spring ForceSpring or Spring Force Mating Ring or SeatMating Ring or Seat

Primary Ring or FacePrimary Ring or Face

3939

Spring Drive

Left hand or right hand spring?Left hand or right hand spring?


Mechanical Seal Mechanical Seal TheoryTheory

Primary SealPrimary Seal

4141

Primary Seal

Higher pressure on outside diameterHigher pressure on outside diameterHigher pressure holds faces closedHigher pressure holds faces closed

Fluid is forced between faces to lubricateFluid is forced between faces to lubricate Springs keep faces closed when no pressureSprings keep faces closed when no pressure

Mating Mating RingRing

Primary Primary RingRing

Springs

4242

Primary Seal

Faces lapped flat to within 1 - 3 light bandsFaces lapped flat to within 1 - 3 light bands

4343

Primary Seal

Fluid film thickness is very importantFluid film thickness is very important too thin - wear, causing early seal failuretoo thin - wear, causing early seal failure too thick - visible leakagetoo thick - visible leakage

Must be:Must be: present - present - beware dry runningbeware dry running stablestable clean - clean - beware abrasive wear symptomsbeware abrasive wear symptoms reasonable viscosityreasonable viscosity temperature controlledtemperature controlled acceptable pressure.acceptable pressure.

4444

Abrasive Wear

..

4545

Is this abrasive wear?

..

4646

Primary Seal - Abrasives

4747

Primary Seal - Abrasives

4848

Cyclone Separator

From pump dischargeFrom pump discharge

To mechanical sealTo mechanical seal

To pump suctionTo pump suction

4949

Stable Fluid Film

5050

Coning Out – Positive Rotation

5151

Coning Out – Positive Rotation

5252

Coning In – Negative Rotation

5454

CStedy

Type 48 Refinery SealType 48 Refinery SealCStedy simulation.CStedy simulation.

Type48.aas

Click hereto run…

5555

Type 48 Primary Rings

Type 48LPType 48LPType 48MPType 48MP

5656

Type 48 / Type 28 Primary Rings

5757

Primary Seal

If faces are not flat, contact generates heatIf faces are not flat, contact generates heatExcessive wear = short lifeExcessive wear = short life

1 light band = 0.00001181 inch or 0.0003 mm1 light band = 0.00001181 inch or 0.0003 mm

5858

Lapping

5959

Lapping

6060

Lapping

6161

Flatness Checking - Tools

6262

Flatness Checking

6363

Flatness Checking

6464

Flatness Checking

Distance between dark bands only affected by angle

of Optical Flat

6565

Flatness Checking

6666

Flatness Checking

6767

Flatness Checking

Dry Gas SealDry Gas Seal faces are faces are notnot lapped flat lapped flat

Primary Ring / Face is Primary Ring / Face is convexconvex

Mating Ring / Seat is Mating Ring / Seat is groovedgrooved

6868

Flatness Checking

6969

Primary Seal – Wet Seals

Primary Ring (Narrow - Softer) MaterialsPrimary Ring (Narrow - Softer) Materials Carbon-graphiteCarbon-graphite

resin impregnatedresin impregnated antimony impregnatedantimony impregnated

Carbon converted to Silicon CarbideCarbon converted to Silicon Carbide resin impregnatedresin impregnated

7070


Carbon converted toCarbon converted toSilicon CarbideSilicon Carbide

7171

Solid Silicon CarbideSolid Silicon Carbide pure sinteredpure sintered reaction bondedreaction bonded

Tungsten CarbideTungsten Carbide nickel or cobalt nickel or cobalt bondedbonded


Primary Ring (Narrow - Softer) MaterialsPrimary Ring (Narrow - Softer) Materials Carbon-graphiteCarbon-graphite

resin impregnatedresin impregnated antimony impregnatedantimony impregnated

Carbon converted to Silicon CarbideCarbon converted to Silicon Carbide resin impregnatedresin impregnated

7272


Mating Ring (Wide - Harder) MaterialsMating Ring (Wide - Harder) Materials CeramicCeramic

99.5% aluminium oxide99.5% aluminium oxide

7373

Mating Rings: Ceramic

..

7474

Mating Rings: Ceramic

..

7575


Mating Ring (Wide - Harder) MaterialsMating Ring (Wide - Harder) Materials CeramicCeramic

99.5% aluminium oxide99.5% aluminium oxide

Silicon CarbideSilicon Carbide pure sintered or reaction bondedpure sintered or reaction bonded

Tungsten CarbideTungsten Carbide cobalt or nickel bondedcobalt or nickel bonded

7676

Primary Seal - Dry Gas Seals

Primary Ring MaterialsPrimary Ring Materials

Carbon-graphiteCarbon-graphite

antimony impregnatedantimony impregnated

resin impregnated (e.g., Hresin impregnated (e.g., H22S > 1%)S > 1%)

Cranite 2000 (e.g., high pressure – T28EXP)Cranite 2000 (e.g., high pressure – T28EXP) Carbon-graphite/silicon carbide composite materialCarbon-graphite/silicon carbide composite material

Note: In Type 28 Series Dry Gas Seals the Note: In Type 28 Series Dry Gas Seals the Primary Ring is Primary Ring is alwaysalways the the stationarystationary component component

7777

Primary Seal - Dry Gas Seals

Mating Ring Materials (Rotating in Type 28)Mating Ring Materials (Rotating in Type 28) Tungsten CarbideTungsten Carbide

Cobalt bondedCobalt bonded Nickel bonded (Optional)Nickel bonded (Optional)

Silicon CarbideSilicon Carbide Pure sinteredPure sintered Liquid phase sintered - high pressure (XP/EXP) Liquid phase sintered - high pressure (XP/EXP)

““Ductile” Mating RingDuctile” Mating Ring Tungsten carbide plating on stainless steelTungsten carbide plating on stainless steel

7878

Mating Ring Material Selection Tungsten Carbide (Cobalt bonded)Tungsten Carbide (Cobalt bonded)

ToughTough High strengthHigh strength Best slow roll performanceBest slow roll performance Cobalt binder can be chemically attackedCobalt binder can be chemically attacked Nickel bonded is available - better Nickel bonded is available - better

resistanceresistance Silicon CarbideSilicon Carbide

Highly corrosion resistanceHighly corrosion resistance Good slow roll performanceGood slow roll performance Very brittle – easily chippedVery brittle – easily chipped

7979

Mating Rings

Chloride attack on Chloride attack on Tungsten CarbideTungsten Carbide

8080

Mating Ring Material Selection

Ductile Mating Ring MaterialDuctile Mating Ring Material Ni/Cr tungsten carbide on stainless steelNi/Cr tungsten carbide on stainless steel

E.g., 410 SS; 17/4 PH; Duplex SSE.g., 410 SS; 17/4 PH; Duplex SS Ideal for outboard sealIdeal for outboard seal Virtually indestructible – will not shatterVirtually indestructible – will not shatter Lower costLower cost Low thermal conductivityLow thermal conductivity Maximum differential pressure 50 barMaximum differential pressure 50 bar Higher leakage due to distortionHigher leakage due to distortion Minimum ΔP of 1 bar required – note O/BMinimum ΔP of 1 bar required – note O/B

8181

Materials

Material

JC Code

Vickers Hardness

Thermal Conductivity W/m°C@20°C

Expansion Coefficient

X 10-6/°C

Thermal Shock

000’s W/m

Density 000’s kg/m3

Silicon Carbide Pure Alpha Sintered 277 2500 125 4.0 24 3.1

Silicon Carbide +10% Si. Reaction Bonded 088 2500

+ softer Silicon 150 4.6 35 3.1

Converted Silicon Carbide/ Carbon 121 2500

+ softer carbon 50 4.0 30 2.0

Tungsten Carbide +6% Cobalt 025 1500-1600 100 5.2 48 14.7

Tungsten Carbide +6% Nickel 005 1300-1500 80 5.6 43 14.7

Aluminium Oxide 99.5% Alumina 059 1500+ 26 6.9 6 3.9

Austenitic Cast Iron 13% Ni, 6% Cu 007 200 40 19.3 - 7.3

Carbon-Graphite Resin Impregnated 171 90

(estimated) 12 3.7 10 1.8


Mechanical Seal Mechanical Seal TheoryTheory

Secondary SealSecondary Seal

8383

Secondary Seal

8484

Secondary Seal Three basic formsThree basic forms

O-ringsO-rings PTFE sealing ringsPTFE sealing rings

WedgesWedges ChevronsChevrons ‘‘C’ ringsC’ rings Sleeved o-ringsSleeved o-rings

BellowsBellows ElastomerElastomer MetalMetal

formedformed edge weldededge welded

PTFEPTFE

Two groupsTwo groups PusherPusher

Sliding o-ringsSliding o-rings PTFE sealing ringsPTFE sealing rings

Non-pusherNon-pusher BellowsBellows

8585

Secondary Seal: Pusher

Primary ring moves forward to take up wearPrimary ring moves forward to take up wearO-ring moves forward with the primary ringO-ring moves forward with the primary ring

Pushed by the hydraulic and spring pressuresPushed by the hydraulic and spring pressures

8686

Secondary Seal: Pusher

AdvantagesAdvantages sudden failure very unlikelysudden failure very unlikely higher pressure capability - primary ring not stressedhigher pressure capability - primary ring not stressed wide choice of materials for all componentswide choice of materials for all components field repairablefield repairable

DisadvantagesDisadvantages hang-up (not likely where o-ring is well isolated)hang-up (not likely where o-ring is well isolated) permanent set / pressure problems (cause hang-up)permanent set / pressure problems (cause hang-up) excellent shaft surface finish requiredexcellent shaft surface finish required maximum temperature ~260°C.maximum temperature ~260°C.

8787

Pusher Seal: Hang-up

Product leakage solidifies / crystallises / polymerisesProduct leakage solidifies / crystallises / polymerisesPrevents o-ring pushing forward - leakage increasesPrevents o-ring pushing forward - leakage increases

An An external external quench quench will will prevent prevent hang-uphang-up

8888

Pusher Seal: Hang-up

Excessive pressure and / or heat:Excessive pressure and / or heat:permanent set or extrusionpermanent set or extrusion

Or, ensure Or, ensure minimum minimum

clearance hereclearance here

8989

Secondary Seal: O-Rings

Material

Typical Trade/ISO/DIN/

Common names

Minimum temperature

in seals

Maximum temperature

in seals

Comments

Medium Nitrile NBR

Buna N -40°C 100°C General purpose material.

Up to 120°C in hydrocarbons

Chloroprene CR

Neoprene -40°C 100°C Ideal for refrigeration duties. Some specialist applications.

Ethylene Propylene EP; EPR; EPDM

Nordel™ -40°C 135°C Ideal for water up to 150°C.

Avoid oil/hydrocarbons.

Fluorocarbon* FPM

Viton A™ -30°C 200°C Maximum 135°C in water.

Hardens in high temp steam.

Perfluoroelastomer* (High temp. grades)

Isolast HT™ Kalrez™ -20°C 315°C

Wide range of chemical compatibility.

Perfluoroelastomer* (Low temp. grades)

FFKM; Isolast™ Kalrez™ -20°C 215°C

Wide range of chemical compatibility.

* Note: Health and Safety warning!* Note: Health and Safety warning!

9090

Secondary Seal: O-rings

** > 275°C - Hydrogen Fluoride gas is a > 275°C - Hydrogen Fluoride gas is a possibilitypossibility

> 316°C - Hydrogen Fluoride gas is a certainty> 316°C - Hydrogen Fluoride gas is a certainty

Open system - Hydrogen Fluoride vapourOpen system - Hydrogen Fluoride vapour Closed system (e.g., o-ring groove) condenses Closed system (e.g., o-ring groove) condenses to to form liquid form liquid Hydrofluoric AcidHydrofluoric Acid

Wear Neoprene or PVC glovesWear Neoprene or PVC glovesProtect eyesProtect eyesWash parts in Calcium Hydroxide solutionWash parts in Calcium Hydroxide solution

Fluorocarbon

9191

Secondary Seal: O-rings

** > 400°C - Hydrogen Fluoride gas is likely > 400°C - Hydrogen Fluoride gas is likely

Open system - Hydrogen Fluoride vapourOpen system - Hydrogen Fluoride vapour Closed system (e.g., o-ring groove) condenses Closed system (e.g., o-ring groove) condenses to to form liquid form liquid Hydrofluoric AcidHydrofluoric Acid

Perfluoroelastomer

Wear Neoprene or PVC glovesWear Neoprene or PVC glovesProtect eyesProtect eyesWash parts in Calcium Hydroxide solutionWash parts in Calcium Hydroxide solution

9292

Stainless Steel Colour Chart

Straw yellowStraw yellow 370 – 425°C370 – 425°C

BrownBrown 480 – 540°C480 – 540°C

BlueBlue 600°C600°C

BlackBlack 650°C650°C

ALLALL of these are of these are above the danger levelabove the danger level for forFluorocarbon and Perfluoroelastomer materialsFluorocarbon and Perfluoroelastomer materials


Heat / Heat / Temperature Temperature

ControlControlMaintaining a stable Maintaining a stable

fluid filmfluid film

9494

Heat in Stuffing Box

Two sources of heatTwo sources of heat heat soak from the productheat soak from the product heat generated by the sealheat generated by the seal

9595

Heat generation - the causes

sizesize speedspeed temperaturetemperature

coolingcooling

product propertiesproduct properties flush or multipleflush or multiple

surface finish - facessurface finish - faces materials of facesmaterials of faces hydraulic pressurehydraulic pressure

Too much heat Too much heat generatedgenerated• dry-runningdry-running• excessive wearexcessive wear• very short seal lifevery short seal life

9696

Hydraulic Balance

9797

Hydraulic Balance

9898

Hydraulic Balance

9999

Hydraulic Balance

103103

Hydraulic Balance - Benefits Reduced heat generationReduced heat generation

Less thermal distortion of the running facesLess thermal distortion of the running faces less heat to be dissipated - less cooling requiredless heat to be dissipated - less cooling required

Reduced wear rateReduced wear rate longer lifelonger life

Reduced power required to drive the sealReduced power required to drive the seal lower running costslower running costs

Increased pressure range for pusher sealsIncreased pressure range for pusher seals this simple modification allows this simple modification allows muchmuch higher higher

pressures to be sealedpressures to be sealed..


Environment of a Environment of a Mechanical SealMechanical Seal

Multiple SealsMultiple Seals

105105

Single seal is not enough

Single seals utilise Single seals utilise process gas or fluid to process gas or fluid to provide the provide the lubricating interface lubricating interface filmfilm

Use multiple seals if:Use multiple seals if: product is toxicproduct is toxic product is flammableproduct is flammable environmentalenvironmental isolation requiredisolation required product changes stateproduct changes state product is not a good product is not a good

lubricant or is abrasivelubricant or is abrasive suction pressure is lowsuction pressure is low expensive productexpensive product critical machinecritical machine

106106

Single seal is not enough

Use multiple seals if:Use multiple seals if: product is toxicproduct is toxic product is flammableproduct is flammable environmentalenvironmental isolation requiredisolation required product changes stateproduct changes state product is not a good product is not a good

lubricant or is abrasivelubricant or is abrasive suction pressure is lowsuction pressure is low expensive productexpensive product critical machinecritical machine

Single seals utilise Single seals utilise process gas or fluid to process gas or fluid to provide the provide the lubricating interface lubricating interface filmfilm

107107

Multiple Seals

Two common arrangementsTwo common arrangements

TandemTandem

low pressure buffer between sealslow pressure buffer between seals

high integrity secondary containmenthigh integrity secondary containment

inboard seal lubricated by processinboard seal lubricated by process

Double (pressurised)Double (pressurised)

pressurised barrier supply requiredpressurised barrier supply required

inboard seal lubricated by the barrier inboard seal lubricated by the barrier

mediummedium

110110

Multiple Seals: TandemMultiple Seals: Tandem

Inboard seal Inboard seal most likely to most likely to fail firstfail first

Buffer fluid Buffer fluid level/pressure level/pressure will risewill rise

Outboard seal Outboard seal acts as acts as secondary secondary containmentcontainment

Process can Process can continue until continue until completedcompletedBasic tandem non-pressurised doubleBasic tandem non-pressurised double

Use API Plan 52Use API Plan 52

111111

Multiple Seals: Tandem

Low Low pressure pressure fluid supplyfluid supply

112112

Multiple Seals: Tandem

113113

Double Seals: Back-to-Back

Basic back-to-back pressurised double sealBasic back-to-back pressurised double seal

Pressurised Pressurised barrier fluid barrier fluid is circulated is circulated round the round the sealsseals

This This lubricates lubricates both sets of both sets of seal facesseal faces

Use API Plan 53Use API Plan 53

114114

Double Seals: Back-to-Back

If outboard If outboard seal fails, seal fails, barrier barrier pressure will pressure will fail and fail and pump must pump must be switched be switched off as off as product will product will leak outleak out

Basic back-to-back pressurised double sealBasic back-to-back pressurised double sealUse API Plan 53Use API Plan 53

115115

Double Seals: Face-to-Face

StationarStationary sealsy seals

Rotating Rotating Mating Mating RingRing

Similar in operation to back-to-back double sealSimilar in operation to back-to-back double sealMuch shorter - only one mating ringMuch shorter - only one mating ring

Simple rotating componentsSimple rotating components


Cartridge SealsCartridge Seals

AdvantagesAdvantages

118118

Cartridge Seals

Cartridge seals - designed to make installation simpleCartridge seals - designed to make installation simple

Seal fully Seal fully assembled in its assembled in its own housing at own housing at factoryfactoryAll screws accessible All screws accessible from outsidefrom outside

Fully pressure tested Fully pressure tested before despatchbefore despatch

Pre-set to working Pre-set to working length - no length - no measuringmeasuringSeal and seat Seal and seat square to shaft axissquare to shaft axis

Lapped faces cannot Lapped faces cannot be damaged. be damaged.

119119

Conventional Seals

Fitting Conventional Mechanical SealsMark position of face of stuffing box on shaftDismantle pumpLubricate tertiary sealFit seat in end cover - ensure fully home and squareCheck seat is correctly located on anti-rotation pinMeasure distance from front of end cover gasket to seat ('X') taking care not to scratch lapped faceLook up seal working length in fitting instructions (L3)Add 'X' to L3 (or subtract depending on pump design) and note dimension ('Y')Measure 'Y' from mark on shaft towards impellerMark shaft in this positionMeasure from this mark to end of shaft, or nearest step towards impeller and note dimension ('Z')Carefully wipe lapped face of seat perfectly cleanPlace end cover on shaft taking care not to damage seatLightly lubricate shaft and secondary sealSlide seal unit on to shaft, ensuring it is the right way roundWipe lapped face of seal perfectly clean, taking care not to damage the surfaceFit seal 'Z' from end of shaft or shaft step, ensuring it is perfectly square to axis of shaftEvenly tighten grubscrewsAssemble pump taking care not to damage rotating seal unitOffer end cover to face of stuffing box. Check gap before compressing seal with 'A' dimension in fitting instructionsIf incorrect, dismantle pump and start againIf correct, tighten nuts on gland studsCross fingers


120120

Conventional Seals


Common questions:Common questions: was it clean?was it clean? did I look up the correct seal?did I look up the correct seal? did I look up the correct size?did I look up the correct size? is the seat square?is the seat square? did I measure accurately and correctly?did I measure accurately and correctly? will it work?will it work? for how long?for how long? ..

121121

Cartridge SealsFitting Conventional Mechanical Seals

Mark position of face of stuffing box on shaftDismantle pumpLubricate tertiary sealFit seat in end cover - ensure fully home and squareCheck seat is correctly located on anti-rotation pinMeasure distance from front of end cover gasket to seat ('X') taking care not to scratch lapped faceLook up seal working length in fitting instructions (L3)Add 'X' to L3 (or subtract depending on pump design) and note dimension ('Y')Measure 'Y' from mark on shaft towards impellerMark shaft in this positionMeasure from this mark to end of shaft, or nearest step towards impeller and note dimension ('Z')Carefully wipe lapped face of seat perfectly cleanPlace end cover on shaft taking care not to damage seatLightly lubricate shaft and secondary sealSlide seal unit on to shaft, ensuring it is the right way roundWipe lapped face of seal perfectly clean, taking care not to damage the surfaceFit seal 'Z' from end of shaft or shaft step, ensuring it is perfectly square to axis of shaftEvenly tighten grubscrewsAssemble pump taking care not to damage rotating seal unitOffer end cover to face of stuffing box. Check gap before compressing seal with 'A' dimension in fitting instructionsIf incorrect, dismantle pump and start againIf correct, tighten nuts on gland studsCross fingers

Fitting Cartridge SealsFitting Cartridge Seals

Lubricate the sleeve o-ringLubricate the sleeve o-ringSlide cartridge onto shaftSlide cartridge onto shaftAssemble the pumpAssemble the pumpTighten nuts on gland studsTighten nuts on gland studsTighten set screwsTighten set screwsRemove setting clip screws.Remove setting clip screws.

Fitting Cartridge SealsFitting Cartridge Seals

Lubricate the sleeve o-ringLubricate the sleeve o-ringSlide cartridge onto shaftSlide cartridge onto shaftAssemble the pumpAssemble the pumpTighten nuts on gland studsTighten nuts on gland studsTighten set screwsTighten set screwsRemove setting clip screws.Remove setting clip screws.

122122

Cartridge SealsFitting Conventional Mechanical Seals

Mark position of face of stuffing box on shaftDismantle pumpLubricate tertiary sealFit seat in end cover - ensure fully home and squareCheck seat is correctly located on anti-rotation pinMeasure distance from front of end cover gasket to seat ('X') taking care not to scratch lapped faceLook up seal working length in fitting instructions (L3)Add 'X' to L3 (or subtract depending on pump design) and note dimension ('Y')Measure 'Y' from mark on shaft towards impellerMark shaft in this positionMeasure from this mark to end of shaft, or nearest step towards impeller and note dimension ('Z')Carefully wipe lapped face of seat perfectly cleanPlace end cover on shaft taking care not to damage seatLightly lubricate shaft and secondary sealSlide seal unit on to shaft, ensuring it is the right way roundWipe lapped face of seal perfectly clean, taking care not to damage the surfaceFit seal 'Z' from end of shaft or shaft step, ensuring it is perfectly square to axis of shaftEvenly tighten grubscrewsAssemble pump taking care not to damage rotating seal unitOffer end cover to face of stuffing box. Check gap before compressing seal with 'A' dimension in fitting instructionsIf incorrect, dismantle pump and start againIf correct, tighten nuts on gland studsCross fingers

Fitting Cartridge Seals

Lubricate the sleeve o-ringSlide cartridge onto shaftAssemble the pumpTighten nuts on gland studsTighten set screwsRemove setting clips.

Fitting Cartridge Seals

Lubricate the sleeve o-ringSlide cartridge onto shaftAssemble the pumpTighten nuts on gland studsTighten set screwsRemove setting clips.

Common knowledge:Common knowledge: the faces are perfectly cleanthe faces are perfectly clean the seal is set to the correct working lengththe seal is set to the correct working length the seal is square on the shaftthe seal is square on the shaft the seat is correctly fitted and located on pinthe seat is correctly fitted and located on pin the seal has been fully pressure tested, sothe seal has been fully pressure tested, so you know it will workyou know it will work no premature failures due to installation no premature failures due to installation

problemsproblems Fitted faster than any conventional seal.Fitted faster than any conventional seal.

Documents

Gas Seal Course Customer 112003 01a