داستان آبیدیک

block valve


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1 مهندسی صنایع:: شیر مسدود کننده

Block valves need to seal effectively and be secured with a chain and lock. Bleed valves can be located between the two block valves, sized to pass the maximum leak rate, locked open and monitored for leakage. 3.7.3.4 Single Block Valve A single locked, closed and tagged block valve, as a minimum, may be used for certain routine maintenance operations (NOTE: Hot work or welding is not considered routine maintenance), provided that none of the risk factors listed below are present. A single block valve may be used in routine operations such as the following.

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