The “radius of the pipe elbow” such as 45° Elbow should be changed to the bending radius of the pipe, which is usually set by the diameter multiple of the pipe. It has no calculation.
There is no uniform standard for formulas. If the bending radius is small, the local resistance generated by the fluid in the pipeline will be large, such as a large bending radius, resulting in a large installation space, and the manufacturing cost of the corresponding elbow is also high. The elbows of the pipeline are: the elbow casting elbow in the tanning pipe (water gas pipe) (the bending radius is small, and the pipe diameter is not strictly proportional to the diameter, generally less than the 1D pipe diameter, but its size is standard); steel Pressing the bend (the bending radius is small, generally equal to 1D slightly more, there are two kinds of national standards, the so-called big bend and small bend, there is no strict rate relationship with the pipeline); tangent bend (for seamless steel pipeline, in chemical industry Pipes used to be used in the past, especially on high-pressure pipes,such as Alloy Steel Bend which are basically used for bending, whose design requires a bending radius of more than 6 times the diameter of the pipe); corner bends (for high-pressure pipes, oil circuits, which are calcined) Made, directly punched, no bending radius at all); there are also shrimp bends (welded, the bending radius is generally about 1 ~ 1.5, the country has "steel parts" atlas, but in fact, Usually made by the producer.
Cast iron pipe elbows, Seamless Elbow the country has standards, and its bending radius is also very small; plastic pipe elbows, there are industry standards, the bending radius is also small; soft bending is a special elbow; bending radius is freely variable .
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