Cold Pull Piping

"Cold Pull" is another term for the more common "Cold Spring"

Cold Spring (and Cold Pull) is a technique used to compensate for the effect of thermal expansion in long pipe runs. It tends to reduce stress on the elbows at the change of direction (corner) or at expansion loops in piping systems and lowers the forces at the anchor points.

To do this:
First- Calculate the amount of expansion caused by therermal growth during full operation.

Second- Remove 1/2 the calculated growth from the actual dimension of the pipe run from the anchor to the corner or loop at the ambient temperature.

Third- Then spring (or pull) the pipe back at the corner or loopand make the weld