Flowserve ST Series Manuel d'utilisateur télécharger pdf (Page 4)

1.10Pressure testing of the ST/QBM, ST/MRA, ST cartridge

canister dual seal prior to installation is possible but not

necessary.Ifpressuretestingisdesiredthenpressuretest

at1.7bar(25psig)butnevermorethan3.4bar(50psig)with

dry nitrogen or instrument air. Prior to testing Flowserve must be

consultedtodetermineacceptablegasleakagerates.Ifbench

testing is desired the tests may be conducted if and only if

Flowserve has been consulted regarding the safety of testing

thesealcanisteronthebench.Benchtestsafetyissuesmay

exist and cause physical injury and damage.

Caution:Benchtestpressurenevertoexceed3.4bar(50psig)

2 ST/QBM, ST/MRA, ST Cartridge Seal Installation

Tools needed:

 • Open end wrenches for nuts or bolts

 • Allen wrenches for cap screws and set screws

 • LubricantforO-rings

2.1 Attach the seal housing to vessel ange and/or gear box.

Each bottom entry mixer may have a different procedure for

attaching the seal and mixer drive to the vessel. Follow the

assembly instructions and recommendations of the manufac-

tureroftheequipment.DoNOTusethesealcanisterpiping

to lift and handle the seal.

2.1.1 Lubricate the shaft and ange bores over which O-rings

will slidewithanappropriateapprovedlubricant.TheSTline

of seals is typically used in bioprocessing applications where

onlydeionizedwaterisanacceptablelubricant.However,

because of the poor lubricating properties of deionized water

it is recommended that a better lubricant be used if possible.

2.1.2 Line up the shaft with the seal cartridge sleeve. Theseal

canisterwillbeattachedtothebottomofthevesselangeORto

thegearboxandvesselange.Ineithercasetheshaftmustbe

slid through the center of the seal cartridge from a position above

theseal.Thispositioncancontributetobindingand/ortwistingof

the seal sleeve as the shaft moves through it. Note:Iftheseal

canisterisattachedtoa90°gearbox,theweightofthemotor

off-settoonesideputsalargetorqueonthesealcanisterwhich

maydistortthecanisterthatistintothemixerange.  

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Flowserve ST Series Manuel d'utilisateur Page 4