Elbow and elbow the most basic difference is relatively relatively short pipe elbow. R=1 times to 2 times the elbow, and the larger multiple is called a bend. The cold bend in the production process can be bent with a ready to use pipe bending machine, and no two times of corrosion protection can be done in one time. But the elbow should be made by the manufacturer. To do the anticorrosion, the order period is long. Elbow bend to price than high but the price is much higher than the elbow, do not bend antiseptic treatment is easy to damage is of well-known, but because of its cheap price in some of the requirements are not very high engineering use very much.
Elbow to manufacturers custom-made, to anti-corrosion, order cycle length. The cold bend can be bent with a ready - to - pipe bending machine. No two time preservatives are not used in one time. The cold bend pipe construction technology has an oil standard, and the west to east gas transmission has the enterprise standard. But in the open area, the elbow pipe is all right, only the cost is considered, the elbow needs to be heated and the bend is cold, and the cost of the elbow is high. Sometimes narrow sections must be used such as elbow, rock trench, because the bend radius of curvature is small, generally 6D, elbow 40D