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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 h-1 stream of hexane at 100°C. 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 s-1 r calculate pressure drop 2 r F 2586.731 Pa 0.375076 psi D P = r r Ł C v ł 1800 kg h-1 580 kg m-3 17 gal.in.min-1.lbf-0.5 999 kg m-3 0.5 kg s-1 1.29151E-05 m4 s-1 N-0.5 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 equal-percentage 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 45°C, liquid level was 80%, ambient temperature was 8°C....
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