What type of safety valve should be used for extremely hazardous media?
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I have a question for the experts here: During the inspection of our products, the special inspection agency raised an issue stating that pressure vessels with extremely or highly hazardous media cannot use fully open safety valves. I’m not sure which standard specifies this
For pressure vessels with media that are extremely or highly hazardous, it is generally recommended to use pilot-operated safety valves rather than fully open safety valves. This type of safety valve can achieve a more precise and faster response, enabling more effective control in the event of a leak of hazardous materials. For specific standards, refer to relevant regulations such as the \"Regulations on Safety Inspection of Pressure Vessels\". .
Please refer to page 96 of TSG21-2016
Page 96 of TSG 21-2016 specifies the requirement to install a conduit at the outlet of the safety valve to direct the discharged medium to a safe location where it can be properly handled, and prohibits direct discharge into the atmosphere; it does not state that full-opening safety valves cannot be used.
A closed-type safety valve is needed, right? It’s best to add a burst disc in front as well.
HG/T20570 specifies bellows safety valves for extremely hazardous media. According to the Fixed Volume Regulations and Regulation 150, I believe it is incorrect to state that \"pressure vessels with extremely or highly hazardous media cannot use fully open safety valves.\"
What you say makes sense; I checked the models of safety valves, and there are closed-type models among the fully open safety valves
Not only toxicity should be considered, but also pressure relief and explosion prevention.
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