Steel Pipes  Calculate 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.
Approximate Expansion Capacity (mm)  

Nominal Pipe Size (mm)  Width of Expansion Loop  w  (m)  
0.5  1.0  1.5  2.0  2.5  
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  
UBends Expansion Compensator Calculator
Metric Units
This calculator can be used to calculate required width and height of an Ubends expansions compensator.
S  Length of expanding pipe (m)
Expansion coefficient (10^{6} m/m ^{o}C)
Initial temperature (^{o}C)
Final temperature (^{o}C)
Outside diameter of pipe (mm)
Imperial Units
S  Length of expanding pipe (ft)
Expansion coefficient (10^{6} in/in ^{o}F)
Initial temperature (^{o}F)
Final temperature (^{o}F)
Outside diameter of pipe (in)
The Uloops 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 ^{o}C)
dt = temperature change (^{o}C)
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.
ZBends Expansion Compensator Calculator
Metric Units
This calculator can be used to calculate required offset in a Zbends expansions compensator.
S  Length of expanding pipe (m)
Expansion coefficient (10^{6} m/m ^{o}C)
Initial temperature (^{o}C)
Final temperature (^{o}C)
Outside diameter of pipe (mm)
Imperial Units
S  Length of expanding pipe (ft)
Expansion coefficient (10^{6} in/in ^{o}F)
Initial temperature (^{o}F)
Final temperature (^{o}F)
Outside diameter of pipe (in)
LBends Expansion Compensator Calculator
Metric Units
This calculator can be used to calculate required offset in a Zbends expansions compensator.
S_{max}  Length of longest expanding leg (m)
Expansion coefficient (10^{6} m/m ^{o}C)
Initial temperature (^{o}C)
Final temperature (^{o}C)
Outside diameter of pipe (mm)
Imperial Units
This calculator can be used to calculate required offset in a Zbends expansions compensator.
S_{max}  Length of longest expanding leg (ft)
Expansion coefficient (10^{6} in/in ^{o}F)
Initial temperature (^{o}F)
Final temperature (^{o}F)
Outside diameter of pipe (in)
The Lloop calculation is based on equation
L = 0.063 (dl D)^{1/2} (2)
where
L = length of loop (m)
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