Process Equipment and Plant Design
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.

0.3 to 0.5
0.1 to 0.25
0.5 to 0.6
0.65 to 0.80

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for smaller total pressure drop
Shell side, if the flow is counter-current and tube side if the flow is co-current
Shell side for large overall heat transfer co-efficient
Tubes to avoid the expansion of high pressure shell construction

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