Flowserve Tandem Seal Uživatelský manuál stáhnout pdf (Strana 7)

5 Tandem Sealing Systems for Supply Tanks

Pre-engineeredandassembledforsafe,reliablehandlingoftoxic,ammable,

carcinogenic,orotherreactiveorganiccompounds. Atandemsealconguration

isusedwhenaback-upsafetysealisrequired,usuallyincriticalprocesspumps.

Buttandemsealarrangementsproduceweepageacrossthefaceoftheprimary

seal.Whenpumpingahazardousuid,thisweepageshouldnotbeventedto

theatmosphere.Containmentanddisposalmustbeasafe,controlledprocess.

Flowserve’ssupplytankwiththetandemsealingsystem(TSS)istheidealsolu-

tion.

Operation

Duringnormaloperationof

thetandemsealingsystem,

potentiallyhazardoussealweep-

ageisventedtoasafedisposal.

Intheeventofaprimarysealleak

orfailure,asthesecondaryseal

takesover,pressurebuildsup

acrosstheoriceatthetopofthe

supplytankassembly.Thisbuildup

isthendetectedbythepressure

switchwhichactivatesanalarm.

Asignalfromthepressureswitch

alsoclosestheventsolenoidvalve

toisolatethehazardousvaporow

untilorderlyprocessshutdownand

maintenancecanbeperformed.

(SeeFigure3)Includedinthe

tandemsealingsystemoptionare

apressuregage,pressureswitch,

solenoidvalve,globevalves,ar-

moredlevelgage,andorice.

Models available

Supplytankmodelsforusewith

tandemsealingsystemsaremade

fromheavyduty304stainlesssteel

withpressureratingsof400psig

(2760kPa)or900psig(6200kPa),

andfromcarbonsteelwitharating

of900psig(6200kPa).Orderwith

orwithoutcoolingcoils.

Plan 52 Supply Tank

Figure4

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Flowserve Tandem Seal Uživatelský manuál Strana 7