Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).
Options
A. 250
B. 450
C. 650
D. 750
Correct Answer
650
Process Equipment and Plant Design problems
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1. Brass valves are usually made for pipe sizes __________ inches.
3. Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.
5. Weep holes provided in the plates of a distillation column
Options
A. facilitate draining out liquid from a tray when the unit is not in operation.
B. are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
C. must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
Correct Answer: not less than one-fourth of the tube diameter or 3/16".
10. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is
for a Tee (used as elbow, entering branch) would be
