Are there any specifications for drain lines with dual valves on key equipment?
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For key equipment that discharges pollutants regularly, are there any specifications regarding the use of double valves to prevent the leakage of toxic gases from within the equipment due to imperfect valve closure? Are there any special requirements regarding the installation direction of the valves when connecting them in series?
I’ve seen this before; a double valve or a single valve together with a plug is used. Check the \"Technical Specifications for the Design of Process System Engineering\" HG-T 20570－95 – it is recommended to use a double valve, as using a plug is rather troublesome, and the small valve used for drainage is also relatively inexpensive