Calculation of the thickness of the head in pressure vessels, selection of welding joint coefficients, and issues related to the stress on circumferential welds
Thread Content
If the specifications of a regular pressure vessel made of air-filled material are DN800X1500X6 mm, a welding joint coefficient of 0.85 can be used for the longitudinal seams of the cylinder； When calculating the thickness of the head for a pressure vessel, if the head is formed by pressing a single sheet of steel, should the welding joint factor be set at 1.0? Here, the thickness of the head is calculated separately; so isn’t the stress on the circumferential weld joints of the pressure vessel taken into account? Yet in the calculations, the denominator in the formula for the cylinder is reduced by Pc, while in the formula for the head the denominator is reduced by 0.5Pc. It seems that both axial and tangential stresses are taken into consideration here
It is fine to use a welding coefficient of 1.0 for whole-plate pressing; when joining end caps, the welding coefficient for the cylinder should be used. For the calculation formula of the head, you can refer to the explanation for 150. It is also derived based on the maximum principal stress, with an additional coefficient K added to ensure strength.
When calculating the thickness of the head for pressure vessels, if the head is formed by pressing a single sheet of steel plate, the welding joint factor is taken as 1.0.
Using a single sheet for pressing the head is perfectly fine, bro: lol
When using SW6 for calculations, the weld joint coefficient refers to the longitudinal seam; therefore, it is sufficient to use the joint coefficient for longitudinal seams.
Take 1.0 for the head welding joint; perform local flaw detection on the joint welds