3473-11 HW 7 - CHE 3473 Chemical Engineering Thermodynamics...

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1 of 2 CHE 3473 Chemical Engineering Thermodynamics Fall 2011 Homework #7 Due: Wed, 10/12/2011 5 problems, 18 points total. 1) (3 pts) The operations staff at a gasoline distribution terminal blocked-in (closed valves on each end) a 200 foot section of 4 inch, Sch. 40 carbon steel line containing gasoline. The gasoline was originally at 85 ºF. It is a hot summer day and the line and its contents heat up to 115 ºF by mid- afternoon. The section of pipe was previously hydrotested (tested for mechanical integrity, i.e., no leaks) at 430 psig. a) Do we need to be concerned that the pressure in the blocked-in section of pipe will exceed the hydrotest pressure? The pressure in the line before the valves were closed was 30 psig. Provide quantitative justification for your answer. Data for gasoline: β Thermal expansion coefficient, 1/ºF 5.33 x 10 -4 κ Isothermal compressibility, 1/psi 5.26 x 10 -6 b) What difference, if any, would it make if the length of line that was blocked in was reduced from 200 ft to 50 ft?
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3473-11 HW 7 - CHE 3473 Chemical Engineering Thermodynamics...

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