Design of oblong atmospheric pressure vessels

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I would like to ask the experts: I am currently designing an oblong atmospheric-pressure vessel with a design pressure of 0.04 MPa. The medium handled is highly hazardous, and both the upper and lower end caps are flat plates. There are two issues: 1. What is the commonly used welding joint type for the connections between the end caps and the vessel body? data:image/png;base64,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 type seems to be used quite often, but it isn’t specified in GB/T150.3. Please help resolve this ； 2. There are openings on the upper head plate and the cylinder body; how should the reinforcement for these openings be calculated? I couldn’t find the method in GB/T150.3; please advise.