YOKOGAWA EJX Series User Manual

  <4.InstallingImpulsePiping>
26
IM01C25A01-01E
F0408.ai
Liquid
Gas Steam
Union or flange
Tee
Tee
Drain plug
Drain valve
Drain valve
Drain plug
Union or flange
Union or
flange
Union or flange
Tap valve
Tap valve
Tee
Drain valve
Drain plug
Tap valve
Figure4.8 ImpulsePipingConnectionExamples
(forgauge/absolutepressure
transmitters)
4.3 ProcessPipingInstallation
Precautions(EJ115)
4.3.1 ConnectingProcessPipingtothe
Transmitter
(1) ConrmingtheProcessFluidFlow
Direction
Themark“ ”onthemanifoldindicatesthedirectionin
whichtheprocessuidisowed(fromrighttoleft).
Whenconnectingtheprocesspipingtotheprocess
connector,conrmtheprocessuidowdirection.
F0409.ai
Flow direction (from right to left)
Manifold
Orifice name plate
Process connector
(low pressure side)
Process connector
(high pressure side)
Process connection
(outflow side)
Process connection
(inflow side)
Figure4.9 ManifoldandFlowDirectionIndication
(2) TighteningtheProcessConnector
MountingBolts
Thetransmitterisshippedwiththeprocessconnector
mountingboltsonlylooselytightened.Afterconnecting
theprocesspiping,tightentheseboltsuniformlyto
preventleakswithatorqueof39to49N·m{4to5kgf·m}.
(3) RemovingtheProcessConnectorPort
DustproofCap
Theprocessconnectorportthreadsarecoveredwitha
plasticcaptoexcludedust.Thiscapmustberemoved
beforeconnectingthepiping.(Becarefulnottodamage
thethreadswhenremovingthiscap.Neverinserta
screwdriverorothertoolbetweenthecapandport
threadstoremovethecap.)
4.3.2 RoutingtheProcessPiping
(1) RelationshipbetweenProcessFluid
andManifoldLocations(Forthevertical
impulsepipingtype)
Ifcondensate(orgas)generatedintheprocesspiping
wereallowedtoaccumulate,thenitwouldbenecessary
toremoveitperiodicallybyopeningthedrain(or
vent)plug.However,thiswouldgenerateatransient
disturbanceinthepressuremeasurement.Therefore,the
processpipingmustberoutedsothatanycondensate(or
gas)generatedintheprocesspipingwillnotaccumulate
inthepressure-sensingassemblyofthetransmitter.
NOTE
• Iftheprocessuidisagas,thenasarulethe
manifoldmustbelocatedatthedownsideofthe
pressure-sensingassembly.
• Iftheprocessuidisaliquid,thenasarulethe
manifoldmustbelocatedattheupsideofthe
pressure-sensingassembly.
(2) PipeSizeforProcessPiping
Usea15mm(1/2-inch)pipeforprocesspiping
connectiontotheprocessconnector.
(3) PreventingFreezing
Ifthereisanyriskthattheprocessuidinthetransmitter
pressure-sensingassemblycouldfreezeorsolidify,use
asteamjacketorheatertomaintainthetemperatureof
theuid.
(4) ProcessPipingConnectionExamples
Figure4.10showsexamplesoftypicalprocesspiping
connections.Beforeconnectingthetransmittertothe
process,studythetransmitterinstallationlocation,the
processpipinglayout,andthecharacteristicsofthe
processuid(corrosiveness,toxicity,ammability,etc.),in
ordertomakeappropriatechangesandadditionstothe
connectioncongurations.
Notethefollowingpointswhenreferringtothesepiping
examples.
• Theprocesspipingmaterialusedmustbecompatible
withtheprocesspressure,temperature,andother
conditions.

YOKOGAWA EJX Series Specifications

General

Brand	YOKOGAWA
Model	EJX Series
Category	Transmitter
Language	English