Patent ID: 8235074

Claim:
A pipe or tube comprising two end segments and a middle segment wherein said middle segment having a non-circular cross section that generally looks like a squashed circle that include mathematically defined ellipsoids and ovals, said middle segment of said pipe or tube does not deform significantly under the condition in which the pressure inside said pipe is the same or less than the internal pressure of a pipe that carries ordinary cold tap water, each of said two end segments of said pipe or tube has generally same cross section as said middle section of said pipe or tube, said pipe or tube gets deformed and said squashed circle like non-circular cross section becomes a rounder cross section with a larger area than the area of said squashed circle like non-circular cross section if the substance carried within said pipe is water and said water within said pipe is frozen, and two ends of said pipe or tube haying a said squashed circle like non-circular cross section of same size can be connected together by a proper method including welding.