DuraVent DuraStack Installation - Manual (Page 21)

NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
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BELLOWS EXPANSION JOINT (LB)
1.. .Used.in.diesel.or.turbine.exhaust.installation.for.expansion.and.vibration.
movements.
2.. .Good.for.exhaust.pressure.up.to.60.inches.of.water.column,.it.will.compen-
sate.for.up.to.3”.max.of.expansion..See.table 14.for.maximum.run.with.one.
bellow.
3.. .Bellow.joints.comes.with.a.liner.to.protect.the.bellow.and.to.have.a.smooth.
flow.
4.. .We.suggest.to.always.install.a.12”.length.chimney.downstream.and.upstream.
the.bellow.to.insure.clearance.for.the.liner.and.adding.accessibility.for.sup-
porting..and.guiding..See.Figure 51.‘’bellowjoint’’.for.good.positioning.of.the.
bellow.expansion.joint.
5.. .It.is.of.the.most.important.that.the.bellow.joint.be.properly.supported.and.
guided.in.vertical.and.horizontal.orientation.
6.....Installation.is.done.the.same.way.as.described.in.section.A:.Chimney.and.
fitting.joint.assembly.
Operating temp. [°F] Max distance with one bellow joint [feet]
700 42.8
800 37.5
900 33.3
1000 30.0
1100 27.3
1200 25.0
1300 23.1
1400 21.4
Table 14 - Maximum run with bellow between each fixed point
SECTION F - THERMAL EXPANSION
Thermal Expansion :
1.. .When.Model.DIS./.DAS.is.in.use,.thermal.expansion.will.occur.on.
the.inner.flue.and.outer.casing.
2.. .A.good.estimation.for.thermal.expansion.is.approximately.1”.per.
100’.chimney.length.per.100°F.rise.
Thermal expansion [inch] = (length[feet]/100)x(
∆
T[°F]/100)
3.. .Thus,.the.thermal.expansion.is.dependant.on.the.inner.flue.temperature.
and.the.length.of.the.chimney.between.two.(2).fixed.points.
4.. .Good.installation.requires.that.expansion.greater.that.1/4”.must.be.
compensated.with.either.a.bellow.joint.(LB).or.an.adjustable.length.
(LA)...Depending.on.the.pressure.of.the.system.
5.. .Tees.and.elbows.are.not.designed.to.withstand.bending.moment,.
make.sure.to.compensate.thermal.expansion.before.connecting.to.a.
tee.or.a.elbow.
6.. .Expansion.joints.are.not.designed.to.withstand.lateral.forces.so.they.
must.be.accurately.supported.and.guided.
7.. .Because.the.amount.of.outer.casing.movement.is.the.same.as.the.
inner.flue,.the.outer.casing.must.slide.to.avoid.excessive.forces.on.
tees,.elbows.or.fixed.points...To.accommodate.outer.casing.move-
ments,.wall.guide,.floor.guide.and.suspension.bands.must.allow.
movement.of.the.chimney.
8.. .When.supporting.a.system.with.considerable.height.and.thermal.
expansion,. adjustable. lengths. or. bellow. joints. must. be. used. just.
below.every.fixed.support.above.the.first.to.compensate.for.thermal.
expansion..
9....For.engine.or.turbine.exhaust.system.requiring.pressures.up.to.60.
inches.of.water.column,.or.where.the.construction.must.be.abso-
lutely.gas.tight,.all.welded.bellows.length.(LB).are.recommended.for.
expansion.and.vibration.movements.of.the.exhaust.
10...Low.pressure.systems,.such.as.boilers.(up.to.6.inches.water.column),.
can.effectively.use.the.Adjustable.Length.(LA).
11...Spacing.of.guides.and.supports,.when.a.thermal.expansion.part.is.
used,.should.not.be.greater.than.that.specified.in.Section.A,.table 7.
12...Proper.guiding.and.support.of.expansion.parts.often.requires.closer.
spacing.
EXPANSION JOINTS INSTALLATION
Bellows Expansion Joint (LB) and Adjustable Length (LA) in vertical
runs
1.. .A.Bellows.Expansion.Joints.or.Adjustable.Length.installed.vertically.
should.be.installed.directly.below.one.chimney.length.of.the.highest.
support,.between.fixed.points.(see.Figure 51).
2.. .Always.use.Bellows.Expansion.Joints.or.Adjustable.Lengths.between.
fixed.points.when.expansion.is.over.1/4”..See.table 14 and Table 15
for.maximum.run.between.fixed.points.
3.. .Install. proper. guiding. between. fixed. points. when. using. Bellows.
Expansion. Joint. or. Adjustable. Length,. to. allow. chimney. vertical.
movement.due.to.expansion.
Bellows Expansion Joint and Adjustable Length in horizontal runs
1.. .Same.guidelines.apply.as.for.vertical.run.with.respect.to.expansion.
estimate.and.proper.support.and.guiding.with.the.use.of.Bellows.
Expansion.Joint.and.Adjustable.Length.