The basic difference between an elbow and an elbow is that the elbow is relatively short relative to the elbow. R = 1 to 2 times is the elbow, and the big multiple is called the elbow. In the production process, the cold bend pipe can be bent with the ready-made straight pipe bending machine, and the second-time completion does not require secondary anti-corrosion. However, the elbows should be customized by the manufacturers to do anti-corrosion and have long ordering periods. The elbow price is higher than the elbow but the cost is much higher than that of the elbow. It is well known that the elbow without antiseptic treatment is easily damaged. However, because the price is cheap, it is used in many projects where the requirement is not very high.
The elbow should be customized by the manufacturer, it must be preserved, and the ordering period is long. The cold bend pipe can be bent using an off-the-shelf straight pipe bending machine. One-time completion does not require secondary corrosion. The cold bend pipe construction process has a petroleum standard, and the West-East Gas Pipeline has enterprise standards. However, elbow elbow can be used in open areas. Only the cost is considered. The elbow must be entrenched. The cold bending of the elbow can be used. Of course, the elbow is expensive. Sometimes the elbow must be used in a narrow section, such as a stone section pipe trench, because the radius of curvature of the elbow is small, generally 6D, while the elbow is 40D.
