Square compensator
Thread Content
The thermal expansion coefficient of PE pipes is 0.15; with a temperature difference of 50°C and a pipe length of 100 meters, the calculated expansion amount is 750 mm. Since one square compensator can handle an expansion amount of 50 mm, I will place one compensator every 7 meters. If the compensation amount for a square compensator is 100 mm, then I need to install a compensator every 14 meters. It just seems too dense, so I want to know where I made a mistake.
What is the unit of the coefficient of thermal expansion?
Such a large temperature difference indicates that the operating temperature is relatively high~ Generally, the operating temperature for PE pipes should not exceed 40 degrees~
The compensation capacity of the square compensator you checked refers to that of metal pipes; non-metallic pipes, due to their very low elastic modulus, have excellent flexibility. The same square compensator can absorb a much larger amount of displacement than metal.
The coefficient of thermal expansion of PE pipes is 1.5~1.7×10^-4 /°C; your calculation is correct~~~~ However, PE pipes are not recommended for use at temperatures above 40°C~~~ Therefore, this calculation example is invalid； For this operating condition, PVC pipes are a better choice, as their coefficient of thermal expansion is 33% that of PE~~~
Companies use PE pipes, with insulation added on the outside; as a result, the temperature difference does not reach 50°C. Pre-stretching is also applied during installation, so I place one unit every 30 meters.
I didn’t take many other factors into account when calculating the scaling amount{:1_90:}