Spring-loaded safety valve
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For a type of pressure vessel, a valve is installed below the safety valve mounted on its top. This valve remains fully open under normal conditions, which facilitates the regular calibration of the safety valve. I would like to ask if this approach is acceptable?
A shut-off valve is generally not installed on the inlet pipeline of a safety valve; if one must be installed, it should be sealed in the open position and must not interfere with the operation of the safety valve!
No, to quote a safety slogan from one factory: Safety comes from constant vigilance; accidents result from momentary carelessness. Take a look at TSG21-2016
It is generally not advisable, but it is not prohibited; it should simply meet the requirements of the standards.
That’s how I think about it; the safety valve is there to ensure safety. If the pressure is well controlled during operation, it is also possible to install it this way, but can the pressure really be easily controlled? I really don’t think there’s any need to go through extra trouble with the safety valve. One can never be too careful; accidents are merciless
Sometimes, process requirements dictate that the plant cannot be shut down; safety valves need to be inspected or replaced. The relevant regulations allow for the installation of valves in such cases, but these valves must remain open at all times and be sealed with lead seals.
In that case, it should be emphasized when submitting the inspection application, and the precautions for use also need to be highlighted.
A specific analysis of the individual equipment and pipelines shows that some of them can be added, while for important equipment such as boilers and steam drums, it is definitely not allowed to add anything