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Steel Pipes - Thermal Expansion Loops

Calculating and sizing steel pipe thermal expansion loops.

The expansion loop is a common way to absorb temperature expansion and contraction in steel pipes. Expansion loops can be fabricated from standard pipes and elbows.

Steel Pipes - Thermal Expansion Loops
Nominal Pipe Size
(mm)
Approximate Expansion Capacity (mm)
Width of Expansion Loop - w - (m)
0.51.01.52.02.5
25 35 130
32 25 100 210
40 20 70 150
50   65 125 200
65   50 100 150 220
80   40 75 125 190
100   35 65 115 150

U-Bends Expansion Compensator Calculator

Metric Units

This calculator can be used to calculate required width and height of an U-bends expansions compensator.

Imperial Units

The U-loops calculation is based on equation

w = 0.015 (dl D)1/2       (1)

where

w = width of loop (m)

dl = α dt S = temperature expansion (m)

α = temperature expansion coefficient (m/m oC)

dt = temperature change (oC)

S = length of expanding pipe (m)

D = diameter of pipe (m)

The offset of the loop is 2 w. The length of the loop is 5 w.

Z-Bends Expansion Compensator Calculator

Metric Units

This calculator can be used to calculate required offset in a Z-bends expansions compensator.

L-Bends Expansion Compensator Calculator

Metric Units

This calculator can be used to calculate required offset in a Z-bends expansions compensator.

Imperial Units

This calculator can be used to calculate required offset in a Z-bends expansions compensator.

The L-loop calculation is based on equation

L = 0.063 (dl D)1/2       (2)

where

L = length of loop (m)

Related Topics

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• The Engineering ToolBox (2008). Steel Pipes - Thermal Expansion Loops. [online] Available at: https://www.engineeringtoolbox.com/steel-pipe-expansion-loop-d_1069.html [Accessed Day Month Year].

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7.8.15

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