5
H5-991-406A
H/G-25-SD Installation
Inlet Piping (Suction Feed)
Caution: Do not pump at fluid temperatures above 140° F
(60° C). Consult the Pump Specifications Manual for current
ratings, based on the pump head material.
Install.draincocks.at.any.low.points.of.the.suction.line,.to.permit.
draining.in.freezing.conditions.
Provide.for.permanent.or.temporary.installation.of.a.vacuum.
gauge.to.monitor.the.inlet.suction..Vacuum.at.the.pump.inlet.
should.not.exceed.7.in..Hg.at.70°F.(180.mm.Hg.at.71°C).
Do.not.supply.more.than.one.pump.from.the.same.inlet.line.
Supply Tank
See.the.illustration.on.page..
Use.a.supply.tank.that.is.large.enough.to.provide.time.for.any.
trapped.air.in.the.fluid.to.escape..The.tank.size.should.be.at.
least.twice.the.maximum.pump.flow.rate.
Isolate.the.pump.and.motor.stand.from.the.supply.tank,.and.
support.them.separately.
Install. a. separate. inlet. line. from. the. supply. tank. to. each.
pump.
Install.the.inlet.and.bypass.lines.so.they.empty.into.the.supply.
tank.below.the.lowest.water.level,.on.the.opposite.side.of.the.
baffle.from.the.pump.suction.line.
If.a.line.strainer.is.used.in.the.system,.install.it.in.the.inlet.line.
to.the.supply.tank.
To. reduce. aeration. and. turbulence,. install. a. completely-
submerged.baffle.plate.to.separate.the.incoming.and.outgoing.
liquids.
Install.a.vortex.breaker.in.the.supply.tank,.over.the.outlet.port.
to.the.pump.
Place.a.cover.over.the.supply.tank,.to.prevent.foreign.objects.
from.falling.into.it.
Loctite is a registered trademark of Loctite Corporation.
ScotchBrite is a trademark of 3M Company.
Hose Size and Routing
Size. the. suction. line. at. least. one. size. larger. than. the. pump.
inlet,.and.so.that.the.velocity.will.not.exceed.1.to.3.ft/sec.(0.3.
to.0.9.m/sec):
.
Velocity.(ft/sec).. =.
0.408.x.GPM
.
.
.
Pipe.I.D.
.*
*where.pipe.I.D..is.in.inches
Keep.the.suction.line.as.short.and.direct.as.possible.
The.smallest.permissible.inlet.hose.size.is:
1.to.10.gpm............................................................. 1-1/.in..I.D.
11.to.0.gpm................................................................. .in..I.D.
1.to.38.liters/min.......................................................38.mm.I.D.
39.to.76.liters/min.....................................................50.mm.I.D.
Use.flexible.hose.and/or.expansion.joints.to.absorb.vibration,.
expansion,.or.contraction.
If.possible,.keep.the.suction.line.level..Do.not.have.any.high.
points.to.collect.vapor.unless.these.high.points.are.vented.
To.reduce.turbulence.and.resistance,.do.not.use.90°.elbows..
If.turns.are.necessary.in.the.suction.line,.use.45°.elbows.or.
arrange.sweeping.curves.in.the.flexible.inlet.hose.
If.a.block.valve.is.used,.be.sure.it.is.fully.opened.so.that.the.flow.
to.the.pump.is.not.restricted..The.opening.should.be.at.least.
the.same.diameter.as.the.inlet.plumbing.I.D.
Do. not. use. a. line. strainer. or. filter. in. the. suction. line. unless.
regular.maintenance.is.assured..If.used,.it.should.have.a.free-
flow.area.of.at.least.three.times.the.free-flow.area.of.the.inlet.
Install. piping. supports. where. necessary. to. relieve. strain.
on. the. inlet. line. and. to. minimize. vibration..
These supports
are essential because the manifold is plastic and more
susceptible to damage.
Always.tighten.all.piping.connections,.gauges,.and.regulators.
before.installing.the.piping.cluster.into.the.pump.manifold.
Inlet Piping (Pressure Feed)
Provide.for.permanent.or.temporary.installation.of.a.vacuum/
pressure. gauge. to. monitor. the. inlet. vacuum. or. pressure..
Pressure.at.the.pump.inlet.should.not.exceed.50.psi.(3.5.bar);.
if.it.could.get.higher,.install.an.inlet.pressure.regulator.
Do.not.supply.more.than.one.pump.from.the.same.inlet.line.
Always.tighten.all.piping.connections,.gauges,.and.regulators.
before.installing.the.piping.cluster.into.the.pump.manifold.
