66. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.
67. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.
68. Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.
69. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.
70. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally __________ the tube wall thickness.
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