Question

A system using 10-inch (10") internal diameter pipe requires a selection of flanged valves. Consider 10" ball valves, gate valves, globe valves, and check valves in the fully-open position; and butterfly valves in a variety of open positions. FNW has been chosen as the equipment supplier; the relevant data sheets can be found on Desire2Learn (see below for information on valve part numbers and cor- responding files). The data sheets give valve coefficients (C,): flow rates in GPM corresponding to a pressure drop of 1 psi across the valve (for 60°F water). The flow through the system is normally wa- ter at 25°C with a flow rate of 610 L/min, through smooth-walled stainless steel tubing. (a) Consider the four valves listed below (specification file names in parentheses). Determine the loss coefficient (K) and equivalent pipe length (Lequir) for each valve. . 10" Class 150 ball valve (ile: FNW flanged StSt ball valve 600.pdf) 10" Class 150 gate valve (file: FNW Cv.pdf) . 10" Class 150 globe valve (file: FNw Cv.pdf) 10" Class 150 check valve (ile: FNW Cv.pdf) (b) Now consider a buterfly valve in the same system, at different angles ranging from slightly to ful- ly open: 20°, 30°, 40°, 50°, 60°, 70°, 80, 90°. Calculate the loss coeficient for each angle (valve co- eficients are given). Assume that the valve coefficient (C.,) varies linearly from 0 to 20° and also estimate the loss coefficients for angles of 1°, 2o, 5°, and 10°. O" seated butterfly valve (file:FNWsteel butterfly valve 73 1+732.pdf) .

Answer 1

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