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A sealed rigid vessel has volume of 35 ft^3 and contains 2 lbm of water at 200 F. The vessel is now heated. If a safety pressure

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A sealed rigid vessel has volume of 35 ft3 and contains 2 lbm of water at 200 F. The vessel is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 400 F?

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Process: v = V/m = constant

State 1:  v1 = 35/2 = 17.5 ft3/lbm 

it is 2-phase

State 2: 400°F, 17.5 ft3/lbm between 20 and 40 lbf/in2 so interpolate

P ≅ 32.4 lbf/in2 (28.97 by software) 

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