Methods and principles for determining the wall thickness of metal fabrication pipeline fittings
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For any pipe fitting standard, there are 3 methods for determining the wall thickness of the pipe fitting (the body itself): (1) The material data sheet provides the thickness value directly, for example: 20 mm. (2) The material data sheet gives the SCH rating for the pipe fitting’s thickness, such as sch80s; the actual thickness value is then obtained by consulting a table. (3) If the data sheet specifies the thickness of the fitting’s nozzles, then the thickness of the fitting’s body must be determined through strength calculations; the thickness of the nozzles must not be considered equivalent to the thickness of the fitting itself. For high-pressure fittings, it is necessary to calculate the strength of the fittings. The focus of this post is to introduce the topic of strength calculation for pipe fittings: 1. Under what circumstances is it necessary to perform strength calculations on pipe fittings? 2. What are the bases for calculating the strength of pipe fittings? 3. How to calculate the strength of pipe fittings?
For standard pipe fittings, only the wall thickness of the pipe is required; no calculations are needed. The wall thicknesses of various parts of such fittings are specified by standards such as GBT 12459-2017 \"Steel Butt-Welded Fittings – Types and Parameters\". Only non-standard pipe fittings require calculation and fabrication in accordance with regulations. The regulations for its fabrication can refer to Clause 5 \"Pipe Processing\" of the \"GB 50235-2010 Code for Construction of Industrial Metal Piping Projects\"