How to measure the angle and length of pressed elbows during pipeline installation

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How to measure the angle and length of pressed elbows during pipeline installation: Currently, pressed elbows are widely used in pipeline projects, and the quality of the majority of them is satisfactory; however, there are some issues with individual units as well. For example, inaccurate angles and uneven lengths often pose difficulties in the installation process, and may even lead to rework and waste. Therefore, prior to construction, on-site measurements are usually carried out; here are some simple methods for such measurements. I. Measurement of the angle of medium and low pressure elbows: 1. For pressed elbows with a nominal diameter of 150 mm or less in medium and low pressure applications, place them vertically with one end resting on the wide surface of the channel steel. Rest the short side of a right-angled ruler against the channel steel, and place the long side against the other opening of the elbow, checking to see whether the upper and lower walls of that opening are in contact with the ruler. If all are labeled, it means the elbow is 90° ； If there is a spot where it has not been attached, it indicates that the angle of the elbow is incorrect; care should be taken when calculating and cutting the materials. The length of the elbow is determined by aligning the vertical end of the right angle with the upper wall of the pipe opening, and then subtracting the radius of the pipe. It is also possible to place the elbow on a flat surface, then use the two straight edges of a set square to press against the two pipe ends of the elbow; if the inner and outer walls of both pipe ends are in contact with the square, it indicates that the elbow is 90° ； If it is applied in only one place, it indicates that the angle of the elbow is incorrect. The straight pipes can be adjusted appropriately to ensure the proper direction of the pipeline.