If the safety valve is to be sent for calibration, does it need to be fitted with a valve that shuts it off in front of the safety valve on the equipment?
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If the safety valve is to be sent for calibration, does it need to be fitted with a valve that shuts it off in front of the safety valve on the equipment? Is there such a standard? How does your factory do it?
According to the general standards for the use and calibration of industrial safety valves, it is necessary to shut down the pipeline or equipment in which the valve is installed before installing it, release the pressure, and then remove the valve for calibration. This is to ensure the safety and reliability of the verification process, preventing accidents caused by the leakage of high-pressure gases or liquids. Specific requirements may vary depending on the industry, equipment, or **standards; please refer to local safety technical specifications or standard operating procedures. In our factory, safety valves are also calibrated in accordance with similar operating procedures. .
But it’s impossible for everything in the factory to be equipped with them
This should be taken into consideration during the design phase. It must be shut down; otherwise, neither safety nor environmental protection standards can be met. Then risk identification is necessary: what is the risk of shutting down the main valve, and is it acceptable?
It’s definitely not possible; if it’s a boiler, the boiler must be shut down or a spare safety valve must be checked and used as a replacement
Boilers usually have two safety valves: one is inspected while the other is in use
Stop the machine, remove the check valve; if the system is not cleaned, a valve must be installed to close it off
I don’t quite understand what the original poster means. Who would dare to disassemble it without closing the valve? Wouldn’t fluid leak out if that were done?
Generally, two safety valves are installed. Except for certain equipment such as boilers, there is a valve in front of each safety valve, and they are checked alternately; nowadays, online testing is also commonly used.
Is online verification done without removing it, while it’s in operation?