Bend and elbow the most basic difference is that the elbow is relatively short. R=1 times to 2 times the elbow, and then a large multiples of the bend. In the production process of cold bend can be readily used straight pipe with a straight pipe bending machine, a one-time completion of the two anti-corrosion. But the elbow to the manufacturers custom, to do anti-corrosion, long order cycle. Elbow price than the bend to high but the price is than the bend to a much higher, without doing anticorrosion treatment bend is easy to damage is well-known, but because of cheap price in some of the requirements are not very high engineering use very much.
Bend to manufacturers custom, to anti-corrosion, long order cycle. The cold bend pipe can be bent with the ready-made straight pipe. A one-time completion of the two anti-corrosion. Cold bend pipe construction technology has an oil standard, west east gas transmission company standards. But open area with elbow is OK, only consider the cost, hot bending bend, cold bending can, of course, is high cost of elbow. Sometimes in a narrow zone must be used for elbow, such as stonework section pipe trench, because of the small elbow radius of curvature, generally for 6D, and the elbow for 40d.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)