Container support and head problems
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When I first started learning design, I encountered a problem. For horizontal tanks, saddle supports and elliptical heads are used. 1. For a DN450 horizontal tank, according to the standard JB/T4712, heavy welded S-type supports should be used. It was found that the diameter of the arc surface in contact with the tank’s cylinder is 450, but the diameter of seamless steel pipes of DN450 is either 457 (type A) or 480 (type B). Type A has a diameter of 457, which is relatively close to 450; however, there is a gap between the 457 diameter cylinder and the ends of the 450 diameter arc plate. How can full welding be achieved in such a situation? 2. An elliptical head of type EHA as specified in GB/T25198 is used for the head, and the outer diameter of its straight edges is 460. This results in a one-sided displacement of 1.5 units compared to the cylinder’s diameter of 457. Should the displacement be ignored during welding? Why aren’t these standard components designed to match the dimensions of the cylinder? I’m very confused and hope experts can provide an answer
:):):):):):):):)
Sure, the cylinder is sealed with a head! Saddle on the cylinder
The manufacturing requirements in the standards state that the arc-shaped gasket of the saddle support should fit tightly against the container wall; therefore, the arc-shaped gasket has to be remanufactured based on the outer diameter of the cylinder, rather than in accordance with the standards. Then why do the standards specify a design that does not ensure a tight fit?
This post was last edited by Yu Qing on 2021-10-20 09:01