Solution sought for SW6 opening reinforcement
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This post was last edited by Jiang Shui Ru Hai Liu on 2021-12-24 at 10:33; the calculated thickness is incorrect – I don’t know where the error lies. Also, I’m not clear about the nominal thickness for takeover, namely “δnt”. The calculated thickness is around 0.4; adding 2 for corrosion and 1 for negative deviation, a 4mm steel pipe should be sufficient. Why choose an 8mm one? I don’t understand what C2 represents in formula A2 within the reinforcement calculations, and how to calculate it
HG/T20581-2020 specifies minimum thickness requirements for nozzles
First, it is necessary to understand what open-hole reinforcement means: it refers to the reinforcement measures taken to compensate for the reduced strength in the area surrounding the open hole
The calculated thickness of a pipe refers to the thickness determined based on the calculated pressure, while the nominal thickness of a pipe refers to its stated thickness. Nominal thickness – negative deviation – corrosion allowance – calculated thickness = excess metal thickness; this is what is used for reinforcement purposes. A1+A2+A3＞A is required for successful reinforcement; based on your data, the reinforcement excess is 15.66%, which is a fairly reasonable value.
It’s simple: if the shell becomes thinner, the tubes need to be thickened. This is necessary to meet the reinforcement requirements compromised by the openings. You can reduce the tube thickness by increasing the nominal thickness of the shell or by adding reinforcement rings.
This post was last edited by Jiang Shui Ru Hai Liu on 2021-12-23 at 17:19. It’s about the calculated thickness – it doesn’t match what I calculated manually; I can’t figure out where the error lies. The value in the calculation sheet is 0.33, while mine is 0.391
The calculation is done using the inner diameter formula; if you use the outer diameter, the result will be slightly different.
The excess length of the thickened pipe is used for reinforcement; otherwise, the reinforcement area might not be sufficient
Why is the coefficient for the welded joint taken over in the calculation book 0.85?
Oh, I see now; it’s like a light bulb going off for me:lol:lol
Mm-hmm, got it. Where are the criteria for choosing things like the joint coefficient? I don’t understand when to choose the correct joint coefficient – for example, what joint coefficient should be used for a gas pressure vessel, and what are the inspection standards?