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Unformatted text preview: Spring 2003 10.450 Process Dynamics, Operations, and Control Problem Sets  8 1. You have an 1800 kg h1 stream of hexane at 100C. Calculate the pressure drop for a fully open valve of C v = 17. estimating pressure drop through fully open valve, given mass flow and Cv mass flow density Cv ref density calculate volumetric flow w F = 0.000862 m3 s1 r calculate pressure drop 2 r F 2586.731 Pa 0.375076 psi D P = r r C v 1800 kg h1 580 kg m3 17 gal.in.min1.lbf0.5 999 kg m3 0.5 kg s1 1.29151E05 m4 s1 N0.5 Of course, you realize that the numbers shown in this calculation sheet would be rounded to a more realistic precision for reporting results: 2590 Pa. 2. Environmental disaster! There was a spill of BaD 4 StUF 2 from a tank; you are required to estimate the magnitude of the release. From checking the records, you find that the valve was open at 40% for 17 s, that it is an equalpercentage valve whose characteristics are represented by a rangeability of 40, and C v is 23. The tank was under nitrogen blanket at 1.2 atm absolute, the temperature was 45C, liquid level was 80%, ambient temperature was 8C....
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 Spring '09
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