Calculation of bend radius of elbow
Thread Content
In some high-pressure and large-flow water systems, the bending radius of the elbow is often required in the pipeline layout, which is usually more than 5 times the outer diameter. I would like to ask, what is the theoretical calculation basis for doing this? After consulting some information, if the force on the elbow is considered, the momentum theorem is used to calculate, and the influence of the bending radius cannot be reflected in the formula. When considering water hammer, there is no calculation method that takes the bending radius into consideration. Please give me some advice!
This post was last edited by Shutong on 2020-3-11 09:37 Very strange, are you a steel pipe manufacturer or a pipeline engineer? If it is a manufacturer, it will calculate the bending radius based on the material and fluid mechanics, and also consider its own processing equipment. If a pipeline design engineer is designing the pipeline layout, you do not need to calculate. You can just select the appropriate nominal diameter and pressure level. If you don't calculate it this way, there may be problems. For pipelines with large flow and relatively high pressure, multi-functional water pump control valves for water supply and drainage are used to achieve waterproof hammer phenomenon. The multi-functional water pump control valve is a new two-stage closing valve that is completely interlocked with the opening and closing action of the water pump, has automatic hydraulic control, and can have three product functions: gate (disc) valve, check valve and water hammer eliminator.
Thank you for your advice. That's it. I was looking at some drawings of high-pressure water pipelines recently, and I saw that in some pipelines, the bending radius of the elbows was 5 times, and some were 4 times. In terms of actual use, the one with a larger bending radius is better, but I wanted to quantify this degree of benefit and calculated it, but I couldn't find a good calculation method. So I’m asking for help here, just to learn more for myself. * a little.
Stop calculating, it’s thankless.
You can read the relevant book GB20801 and there may be a calculation that generally takes five times to reduce the erosion of the elbow by high-pressure fluid.