Do the nozzles of pressure vessels require strength calculations?
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In our calculation sheets, we usually include calculations for the wall thickness of the container cylinder. Is it necessary to calculate the wall thickness of the equipment connections as well? Anyway, I’ve never calculated it before; it should be sufficient, but it still seems a bit imprecise. Why does the cylinder need to be taken into account while pipes don’t, just because they’re thinner? Please explain, preferably with clear requirements in the regulations.
Clause 6.1.3 of GB150.3 (page 153) specifies the conditions under which an area calculation is required; otherwise, calculations are necessary
There are calculations involved in the reinforcement of the joint; the effective thickness of the joint needs to be calculated. If the A2 area is greater than 0, it means there is a surplus amount
The two people upstairs misunderstood me. I’m not talking about reinforcing the openings; I’m referring to whether the wall thickness of the pipe is sufficient to withstand the pressure from the equipment. For example, if the internal pressure of the equipment is 1 Mpa and the diameter of the pipe connected to it is 377x8 mm, it’s necessary to check whether an 8-mm thick wall is enough to handle a pressure of 1 Mpa.
That’s exactly what I mean: once you take over, there will be a sufficient amount of excess material, which means the thickness will meet the requirements. Otherwise, where would the extra reinforcement area for taking over come from? It should be noted that when the pressure increases, it is necessary to verify the thickness at the joint where the upper section and the flange are connected, by using thick-walled pipes for reinforcement
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Thank you for your answer! Regarding the point that \"the thickness for mating with flanges needs to be verified,\" here’s my thinking: The WN flange standards specify a thickness S for the neck portion. If the wall thickness of my pipe is greater than S, I believe that’s sufficient, as the standards were certainly developed with this in mind; otherwise, how would S have been determined?
In fact, the reinforcement calculation for the nozzle openings in the SW6 calculation sheet already takes into account the strength of the nozzle itself. The area A2 represents the effective thickness of the nozzle minus any excess area beyond the thickness determined through strength calculations; this calculated thickness is the one obtained from the strength assessment of the nozzle.
If the thickness of the takeover wall is greater than S, I believe it is necessary to adjust the value of S; that is, S=xx should be specified after the flange specifications in the schedule
When performing calculations for hole reinforcement, the thickness of the nozzle is calculated first...
I understand what the original poster means. In other words, it concerns whether the nozzles on the container need to be calculated. In fact, everything has been taken into consideration in GB150. For example, in cases where no additional strength calculations are required, detailed requirements regarding the connections and pressures are provided; this indicates that the strength of the connections themselves meets the requirements within the specified pressure range. If a connection is not exempt from such calculations, then its strength must be calculated. For example, for a fitting of 89x6, if the pressure rating is within 2.5 MPa, then the pressure requirement can be ignored; but for a fitting of 10x1 that falls outside this range, additional reinforcement calculations are necessary.