Piping and Valves Knowledge: [Daily Question] 10-11-13

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This post was last edited by WQC on 2011-1-4 at 12:34. Multiple-choice question: (Single choice) For hand wheels with a diameter of ≥320 mm, it is allowed for one person to operate the valve with the help of an appropriate lever, but the length of such a lever should generally not exceed (　　) m. A、 0.1 B、 0.2 C、 0.5 D、 1 Note: 1) All participants will receive a reward ； 2) Please hide your replies; the method to do this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. 3) Answer: C. The regulations for using valves state that operators are not allowed to use levers or long wrenches to open or close the valves. At the same time, if the handle length and the diameter of the handwheel are less than 320 mm, only one person is allowed to operate it ； Hand wheels with a diameter of 320 mm or more may be operated by two persons together, or by one person using an appropriate lever (usually with a length not exceeding 0.5 m).