Fundamentals of Manufacturing Processes (True/False Questions) 20170901
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Two drain valves should be installed at the lowest point of combustible gas pipelines that are in continuous operation; the liquid drained should be discharged into a closed system； For drain valves used only during startup and shutdown, a single valve can be installed along with a plug, pipe cap, blind flange, or flange cover.
Two drain valves should be installed at the lowest point of combustible gas pipelines that are in continuous operation; the liquid drained should be discharged into a closed system； For drain valves used only during startup and shutdown, a single valve can be installed along with a plug, pipe cap, blind flange, or flange cover. (v)