Selection of the thickness for welding blind plates
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Dear experts, may I ask what specifications can be referred to when selecting the thickness of temporary welding blind plates for pressure testing? Are there any clear requirements in the ASME standards? Thank you very much!
The thickness selection for temporary welded blind flanges used for pressure testing (test blind flanges) can be determined with reference to the design and thickness calculation requirements for blind flanges specified in ASME B31.3, Process Piping. This specification does not provide a direct table of blind plate thickness values; instead, it requires comprehensive calculations based on the pipeline’s design pressure, temperature, and the grade of the pipeline material. Generally, the design of blind flanges must meet the following requirements: 1. It must be able to withstand the maximum pressure levels during pressure testing, including the design pressure of the piping system, the testing pressure, or any other possible operating pressures. 2. Consider the temperature factor, as temperature affects the strength of materials. 3. The requirements for strength calculations specified in ASME B31.3 must be met, including consideration of factors such as pressure, temperature, and corrosion allowance. The specific thickness calculation can be carried out through the following steps: 1. Determine the design conditions and parameters, including design pressure, temperature, corrosion allowance, pipe material, etc. 2. Use the formulas provided in ASME B31.3 to calculate the allowable pressure for blind flanges. 3. Select an appropriate thickness to ensure the stability and safety of the blind plate under pressure testing conditions. If there is not enough experience and knowledge to carry out the calculations, it is recommended to consult a professional pipeline engineer or use specialized software for such calculations. .