Regarding the issue of excessive pressure application to equipment
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Before each heat treatment, our factory’s equipment is pressurized by itself. Do it once after heat treatment! Generally, the first suppression is not recorded The quality assurance engineer talked about this issue today! I wonder if the colleagues at your company conduct a pressure test before carrying out heat treatment? Will extreme suppression be recorded?
As I understand it, a container is subject to a pressure test after heat treatment. Before heat treatment, only leak testing is allowed. This involves a balance of metal stress through heat treatment. Suppression is not advisable before this. (My personal understanding, for reference only)
For our materials, such as high-strength, chromium-molybdenum, thick-walled materials that are difficult to weld, non-destructive testing is carried out before each heat treatment; only after passing this testing is heat treatment performed, and after that, hydraulic testing is conducted… There is no rule stating that two rounds of hydraulic testing are not allowed. But it’s troublesome after all. Especially large-scale equipment, high-voltage equipment.
Multiple pressure tests are normal and occur frequently; due to the special characteristics of certain equipment, hole welding is carried out again after the pressure test, requiring multiple pressure resistance tests.
There seems to be no mandatory requirement regarding the number of compressions; if multiple compressions are carried out, it is necessary to determine the purpose of each compression and combine those that can be combined together, in order to minimize the number of compressions. After all, compressions simulate the stress conditions under maximum operating conditions, and performing multiple compressions in a short period of time (compared to the device’s service life) is not beneficial for the equipment.
If you are confident in the welding quality of the equipment, you shouldn’t do this!
I think the same! We don’t have any heat treatment equipment here; to avoid subsequent problems, the workshops carry out the heat treatment once before sending the items out! :Sleepy: They won’t listen even if you tell them; there’s nothing you can do
Do you perform non-destructive testing after heat treatment?
Yes! Equipment that hasn’t been heat-treated requires only one pressing operation, while those that have been heat-treated require one more pressing operation!
Yes! Equipment that hasn’t been heat-treated requires only one pressing operation, while those that have been heat-treated require one more pressing operation!