36. Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
37. Brass valves are usually made for pipe sizes __________ inches.
38. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by
39. Welded joint efficiency in the design of chemical process equipment is taken as
40. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually
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