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Steel Pipes - Calculate Thermal Expansion Loops

Calculating and sizing steel pipe thermal expansion loops.

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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)
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Nominal Pipe Size
(mm)

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Width of Expansion Loop - w - (m)
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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.

S - Length of expanding pipe (m)

Expansion coefficient (10-6 m/m oC) 

Initial temperature (oC)

Final temperature (oC)

Outside diameter of pipe (mm)


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Imperial Units

S - Length of expanding pipe (ft)

Expansion coefficient (10-6 in/in oF) 

Initial temperature (oF)

Final temperature (oF)

Outside diameter of pipe (in)


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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.

S - Length of expanding pipe (m)

Expansion coefficient (10-6 m/m oC) 

Initial temperature (oC)

Final temperature (oC)

Outside diameter of pipe (mm)


Load Calculator!

Imperial Units

S - Length of expanding pipe (ft)

Expansion coefficient (10-6 in/in oF) 

Initial temperature (oF)

Final temperature (oF)

Outside diameter of pipe (in)


Load Calculator!

L-Bends Expansion Compensator Calculator

Metric Units

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

Smax - Length of longest expanding leg (m)

Expansion coefficient (10-6 m/m oC) 

Initial temperature (oC)

Final temperature (oC)

Outside diameter of pipe (mm)


Load Calculator!

Imperial Units

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

Smax - Length of longest expanding leg (ft)

Expansion coefficient (10-6 in/in oF) 

Initial temperature (oF)

Final temperature (oF)

Outside diameter of pipe (in)


Load Calculator!

The L-loop calculation is based on equation

L = 0.063 (dl D)1/2       (2)

where

L = length of loop (m)

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Topics

Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


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