How to calculate the straight pipe section between two 45-degree elbows
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Illustrated simple calculation methods for the short pipe between elbows. In pipeline installation, it is common to need to calculate the length of the straight pipe between two parallel elbows; accurate calculations help to increase construction speed and save labor and resources. Examples include the calculation method for the short pipe between 45-degree elbows, the calculation method for the short pipe between two 30-degree elbows, and how to determine the length of the short pipe between 90-degree and 45-degree elbows. Next, I will provide illustrative examples of simple methods for the intermediate short pipes, in the hope of offering useful information to pipeline installation workers, so that construction calculations are no longer a challenge. I. First, understand the elbow dimension data. The subject of this issue is presumably steel seamless pipe fittings. The butt-welded seamless pipe fittings required for various industrial and civil piping installation projects shall meet the requirements of GB/T12459-1990 \"Steel Butt-Welded Seamless Pipe Fittings\". The selected fittings should have the same material as the pipeline, the same outer diameter, and the same wall thickness or a slightly thicker one. The specifications for elbows are shown in the table below: 1. Calculation from the center of any elbow to its end face. For example: the length of a 30° elbow needs to be calculated; the simplest way is to consult the standards. How are 45° and 30° specifically calculated? tan22.5° * the bending radius is equal to the height H of a 45° elbow. The same applies to 30 degrees. First, calculate the center height; compute it. Then, the length of the center minus the height of the bends on both sides gives the length of the short tube in the middle. For example, https://iknow-pic.cdn.bcebos.com/267f9e2f0708283842bf47b1b699a9014d08f1e1?x-bce-process%3Dimage%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_jpg. This is the simple calculation formula I have derived; for detailed steps of the derivation, there are thorough explanations available on Baidu Wenku. Trigonometric functions are needed to determine the height of the elbow. https://iknow-pic.cdn.bcebos.com/a9d3fd1f4134970ac8508a8a9bcad1c8a7865d70?x-bce-process%3Dimage%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_jpg More questions? Do you think my understanding is correct? 1.414 multiplied by the central height gives the slant length; subtracting the lengths of the two elbows from this value yields the distance of the middle short tube. Also, does the value of b refer to the inner or outer dimension of the height? Is the calculation the same for other angles as well? Follow-up: For the central height, different calculation methods are used for other angles; detailed explanations are available in the database
According to pipe fitting knowledge, by using trigonometric functions to calculate the slant length of the pipe and then subtracting the height of two 45° elbows, one obtains the distance between those two 45° bends. Here’s a picture of the calculation formula; you can search on Sogou Wenwen for it. This is the formula for calculating the length of the short pipe in a 45-degree elbow, and it uses the formulas related to right triangles. If you’re not familiar with trigonometric functions, learn them first; if you still don’t understand, there are detailed explanations available on Baidu Wenku. To acquire knowledge, one needs to put in some effort; it’s not advanced mathematics at all – it’s quite simple, and someone with a junior high school education can use it skillfully.
1. Calculation method for the short pipe between two 45-degree elbows: Shortening length = height difference x 1.4142 – 0.8284R, where R is the bending radius of the elbow (i.e., the length of a 90° elbow). 2. First, calculate the center height. Calculate it. Then, the length of the center minus the height of the bends on both sides gives the length of the short tube in the middle.
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The straight section between two 45-degree elbows = the straight-line distance between the two pipes multiplied by 1.4142, minus (0.8284 multiplied by the length of a 90-degree elbow)