Standards for reducing wall thickness of stainless steel heat exchanger shells and heads
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The wall thickness of the equipment cylinder was designed to be 8 mm, but it was measured at 7.4 mm upon receipt. I’m not sure whether this meets the requirements regarding thickness reduction; what are the standards?
Check the standards used for the panels. Generally, the negative deviation for a 8mm thick sheet is 0.3mm
With a steel plate that’s only this thick, how is it possible to reduce its thickness to 7.4 mm? For end caps, it’s sufficient if the actual thickness is greater than the minimum requirement specified in the drawings; however, this requirement isn’t met for cylinder shells. The even thickness negative deviation for steel plates used in pressure vessels is 0.3 mm. You can refer to the GB/T24511-2017 standard; for the thinning of end caps, you may consult Appendix J of GB/T25198-2010
It’s sufficient to meet the calculated thickness + corrosion margin!
The raw material standards also need to be met; it is necessary to check whether it falls within the negative deviation range