Hangers or guides should only be placed in the loop, offset, or change of direction as indicated above. Piping supports should restrict lateral movement and should direct axial movement into the expansion loop. Do not restrain “change in direction” configurations by butting up against joists, studs, walls or other structures.
ΔL = 12 yl (ΔT)
where: ΔL = expansion or contraction in inches
y = 3.2 x 10-5 (coefficient of linear expansion )
l = length of piping run in feet
Δ
T = temperature change °F
(Maximum temperature - temperature @Installation) |
Once the change in length (ΔL) has been determined, the length of an offset or expansion loop required to compensate for this change can be calculated as follows:
 = Length of expansion loop in inches
E = Modulus of elasticity
D = Average outside diameter of pipe
Δ L = Change in length of pipe due to
temperature change
S = Working stress at max. temperature |
