# calculate the minimum valve closure time to comply with the design pressure limitation.

For the case set out in Problem 20.14 above, determine the time taken to re-establish flow if the valve is reopened at some later time. Assume 99 per cent flow time to be sufficiently accurate. Problem 20.14 The pressure rise on closure of a valve on the discharge from a 100m long pipe supplied by a constant head reservoir whose fluid surface level is 6m above the valve is to be limited to 190kNm−2 , this figure being calculated by rigid column theory. If the pipe diameter is 25mm, the pipe friction factor applicable is 0.01, and if the separation losses may be represented by the k value of 10 for the valve fully open, calculate the minimum valve closure time to comply with the design pressure limitation.

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