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Posted by Harold Kestenholz - hydronic.net on February 19, 2002 at 01:22:52:
In Reply to: cold springing posted by Allan Greene on February 18, 2002 at 22:45:17:
'Cold springing' or bending pipe or tubing into place to be able to place it between fittings already in place, is prohibited in many plumbing application codes and is desireable in some boilermaking requirements. If tube runs are fastened so a full length of tubing can only be placed into them by bending the tube to shorten it, then straightening it to make the run before soldering or welding, that is usually prohibited.
However, When boiler pipe or tube is placed between headers, it might be bent to allow the heating expansion to bear upon a bent tube instead of having the edpanding length create a force directly at the ends. the length might be annealed in either case to permit some flexible malleability.
www.sns.gov/constr/convfac/solicitations/F5-2681-01-RFP01-1044/Section%2520G/Specifications/15050-R05.pdf
8.
Work pipe carefully into place. Do not force or spring pipe into place, unless cold
springing is required.
http://www.tubenet.org.uk/technical/tritool.html
Significant out-of-squareness can cause poor fit-ups, forcing the use of cold springing to make the final joints, or, in the case of automatic tube welding, the alignment clamps can pull the joint apart on one side.