Definition of simple pressure vessels
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There is currently a fixed-tube-sheet heat exchanger whose design pressure, design temperature, fluid, volume, and material for both the tube side and the shell side meet the requirements for simple pressure vessels. However, since this heat exchanger has a fixed tube sheet and convex end caps at both ends of the tube side, the definition of a simple pressure vessel states that such a vessel consists of a cylinder, a flat cover, and convex end caps (excluding hemispherical end caps), or it can be composed of two convex end caps. Can this heat exchanger then be classified as a simple pressure vessel, and thus does it not require registration in accordance with the pressure vessel regulations?
That can’t be right; simple pressure vessels seem to be suitable only for single-chamber containers
It is not covered by the non-regulated vessel regulations (including simple pressure vessels and fixed-volume vessels); no design or manufacturing qualifications are required. However, since it complies with GB151 standards, it is advisable to follow those standards for manufacturing
No, it is only applicable to single-chamber devices
No, clearly according to the definition of a simple pressure vessel, the first criterion is not met. The first point is clearly aimed at devices that have a relatively simple design and are easier to manufacture. For heat exchangers, not only are there many components, but their manufacturing is also relatively complex.
Heat exchangers cannot be defined as simple pressure vessels
To escape the jurisdiction of large-scale regulations, one can also start by considering pressure, medium, and volume.
Sections A2.3 and 7.1.11 of TSG 21-2016 \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\" both address simple pressure vessels