PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

All of these

Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

Facilitate draining out liquid from a tray when the unit is not in operation

Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation

Negative

None of these

Positive

No

Co-current heat transfer systems

Heat transfer between corrosive fluids

Cases where temperature difference between the shell and the tubes is more (>50°C)

Counter-current heat transfer systems

Red

Black

Yellow

Blue

Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle

Baffles are supported independently of the tubes by tie rods and positioned by spacers

Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter

Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

0.8

0.25

0.5

0.1

0.25

1.25

0.75

0.5

1/5-1/10th

1/10-1/15th

1/20-1/30th

1/2 to 1/4th

If sufficient slot area is not provided, the gas may pass through the skirt clearance

None of these

Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

None of these

(D₂² - D₁²)/D₁²

(D₂² - D₁²)/D₂²

D₂ - D₁