What are the regulations for marking the bend angles in long-distance pipelines?
Thread Content
For example, a rotation counterclockwise is labeled as a positive angle, while a clockwise rotation is labeled as a negative angle. Still no distinction
Take the case where the pipeline length is in the same direction as the flow of the medium as an example. The concept of the left turn angle is introduced: using a turning point as the rotation axis, and the direction opposite to the flow direction of the medium at that turning point as the initial reference line. The reference line is rotated clockwise until it intersects the pipeline again for the first time; the angle of this rotation is the left turn angle, which is also the angle to be marked.