Liquid Controls CIM100 - Manual (Page 8)

piping
Proper.installation.of.the.flowmeter.minimizes.the.
harmful.effects.of.fluid.swirl..The.rotational.velocity.of.
the.rotor.is.a.function.of.the.fluid.velocity.and.the.blade.
angle.engagement..Fluid.swirl.ahead.of.the.meter.
can.change.the.effective.angle.of.engagement.and.
cause.the.measurement.to.deviate.from.the.supplied.
calibration,.which.was.performed.under.controlled.flow.
conditions..Proper.meter.location.(and.if.necessary,.a.
flow.straightener).prevents.fluid.swirl,.allowing.the.meter.
to.measure.at.its.highest.accuracy.
Meter locatIon
The.section.of.the.pipe.immediately.preceding,.including,.
and.following.the.flowmeter.is.known.as.“the.metering.
location”..Each.of.the.three.metering.arrangements.
shown.below.are.designed.to.minimize.fluid.swirl.
three typIcal MeterInG runs
InstallatIon
In the diagram below, the pipe length requirements
shown represent the minimum recommended
distances between piping components.
floW straIGhtener
A.flow.straightener.is.a.full.cluster.of.thin.wall.tubes.fixed.
within.a.section.of.pipe..The.length.of.the.internal.tubes.
is.equal.to.2.diameters.of.outer.pipe..The.diameter.of.
internal.tubes.is.equal.to.approximately.¹⁄₅.the.inside.
diameter.of.the.outer.pipe..18.to.20.tubes.are.needed.
to.fill.the.pipe..A.flow.straightener.should.be.used.where.
installation.does.not.allow.the.otherwise.straight.run.of.
pipe.upstream.of.the.meter..
Typical.Flow.Straightener.Section
5" 10"
DOWNSTREAM
DOWNSTREAM
DOWNSTREAM
Pipe fitting immediately
preceding the meter location
Pipe fitting immediately
following the meter location
• Wide open
gate or plug
• Sharp right angle bend
mitered elbow
• Straight run of pipe
20 " 5 "
• Long radius bends
• Smooth elbows
• Two elbows
• Partially open valves
Pipe fitting immediately
preceding the meter location
Pipe fitting immediately
following the meter location
5 " 5 " 2 " 3 "
STRAIGHTENER
Any fitting,
valve,
or pipe run
Any fitting,
valve,
or pipe run
Any fitting,
valve,
or pipe run
• Long radius bends
• Smooth elbows
• Two elbows
• Partially open valves
Pipe fitting immediately
preceding the meter location
Pipe fitting immediately
following the meter location
UPSTREAM
UPSTREAM
UPSTREAM
In a newly installed piping system or one in which fittings
have been disturbed, the line should be flushed (or purged)
thoroughly prior to installation. A line purge minimizes the
possible damage to the flowmeter from foreign materials.
Line Purge
¹⁄₅ of diameter
2 diameters
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