Application scope of reinforcement rings
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All three standards, GB/T150-2011, JB/T4736-2002, and HG/T20583-2011, specify the scope of application for reinforcing rings, yet the ranges defined by these standards are not exactly the same. How should one choose the appropriate standard in such a case? 1) Containers manufactured from low-alloy steel with a minimum standard tensile strength of Rm 540 MPa and chromomolybdenum steel (such as 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, 12Cr2Mo1VR, 12Cr1MoVR) ； 2) The thickness of the reinforcement ring is greater than 1.5δn (δn – the nominal thickness of the container wall). 3) Class III pressure vessels with a design pressure of 4 MPa or greater. 4) The wall thickness (δn) of the container shell is greater than or equal to 38 mm. 5) The medium inside the container is an extremely or highly hazardous substance. 6) Fatigued pressure vessels. 7) For pressure vessels operating under high-temperature (design temperature greater than 350°C) and low-temperature (design temperature less than or equal to -20°C) conditions, it is not recommended to use reinforcement rings for strengthening the structure.
For example, a device is a Class 3 pressure vessel with a design pressure of over 4 MPa; according to HG/T20583, reinforcement rings cannot be used, while according to GB150 they are allowed. How should one choose in such a case?
Now, many engineering companies and project owners are imposing increasingly strict restrictions on the use of reinforcement rings. The relevant engineering regulations they have established cover essentially the provisions outlined in the three criteria mentioned by the original poster. Therefore, as mentioned in point 2, for third-class pressure vessels with a design pressure greater than 4 MPa, there is no need to use reinforcement rings for strengthening.
Standards are also being unified through gradual updates. The justification for 20583-2019 has changed. It doesn’t say it’s not applicable; it only says it should be used. . . . . . . Reinforcement. And 150: “If conditions permit, it is recommended to use thick-walled pipes instead of reinforcement rings for strengthening; the value of δnt/δn should be kept between 0.5 and 2.” ”There is no conflict.
Not being mandatory means that it’s up to the designer to decide
Generally, it is done in a strict manner....
This post was last edited by QUYANHUA on 2021-4-22 at 10:07. For proper design, it is necessary to establish design standards first. This is a prerequisite that must be specified in the contract; it cannot be mixed up or used improperly. Design standards are generally proposed by the client (the buyer).
Implement GB/T150. HG/T20583 is merely an industry standard and does not need to be followed.
Generally, when the design pressure is so high, the wall thickness of the container is already quite thick; in such cases, it is simply reinforced as a single unit. It’s also not good if the thickness of the connections themselves is too thin.
One more point: For the reinforcement of container nozzles in hydrogen media or wet H2S environment media, integral reinforcement should be used.