Elbow and the elbow is the difference between the basic pipe elbow is relatively short. R = 1 times to 2 times the elbow, and then called a bend large multiples. Cold bend in the fabrication process can be useful to use ready-made straight pipe bending machine, also not a one-time completion of secondary corrosion. But the elbow to manufacturers custom, to do preservation, order cycle length. The price is higher than the elbow bend elbow, but much higher than cost-effective, anti-corrosion treatment of the elbow did not do a hall known to be damaged, but because of low price is not very high in some of the works required to use very much.

Elbow to manufacturers custom, to corrosion, order cycle length. Cold bending can be directly useful ready-made bender bending. Also not a one-time completion of secondary corrosion. Cold oil pipe has a standard construction technology, natural gas with corporate standards. However, with the elbow bend open lots are OK, just consider the cost, required heat simmer elbow, pipe can be cold, of course, elbow and high cost. Sometimes narrow lot office must bend, such as rock section of trench, as a small bend radius of curvature, usually 6D, while the pipe is 40D.