Carlon P&C Duct and Telephone Duct Expansion and Cont User Manual download pdf

P&C

Duct and Telephone Duct – Expansion & Contraction

www.carlonsales.com

Expansion & Contraction

When duct temperature variations are anticipated during the

installation of Carlon P&C

Duct and Telephone Duct, allow

extra duct footage at each tie-in for contraction. Terminated

duct runs should be covered with backfill from tie-in point

toward the end of the duct run. If the trench must be left

open, don’t terminate the run. All plastic duct may expand

or contract as concrete is poured and cured. When placing

concrete encasement, always encase from one end of the duct

section toward the other end of the section, to allow the free

end to move. Never encase from each end of the section

toward the center.

The coefficient of thermal expansion of Carlon P&C Duct

and Telephone Duct is 3.30 x 10

-5

in/in/°F. The following chart

indicates what expansion or contraction can be expected at

various temperature changes.

Type D Telephone Duct is designated specifically for use

in bridge crossings and exposed applications. Using the

expansion/contraction chart, calculate the number of expan-

sion joints required. Expansion joints provide a 6" allowance

for expansion/contraction. Utilize one expansion

joint for each 100 feet of exposed length for most installations.

The duct should be free to move during expansion/contraction;

the barrel should be securely clamped and the piston should

be aligned properly with the barrel for easy movement.

Bridge Crossings and Exposed Applications

Expansion/Contraction Chart

Gross Automation (877) 268-3700 · www.carlonsales.com · [email protected]

P&C®Duct and Telephone Duct – Expansion & Contractionwww.carlonsales.comExpansion & ContractionWhen duct temperature variations are anti

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Carlon P&C Duct and Telephone Duct Expansion and Cont User Manual