Page 55 - Plant design and economics for chemical engineers

38 PLANT DESIGN AND ECONOMICS FOR CHEMICAL ENGINEERS

TABLE 6
Factors in equipment scale-up and design (Continued)

I jpproxi-
Maximum I nate
;cale-up I .ecom-
1 Is pilot atio based I nended
1 3Iant Major variables In indi- safety or
1 Jsually for operational Major variables zaated char- , 3ver-
Type of 1 leces- design (other characterizing lcterizing , jesign
equipment ‘ iary ? than flow rate) size or capacity variable I lador, %

Packed columns No Equilibrium data Flow rate >lOO:l 15
Superficial vapor Diameter 1O:l
velocity Height to di-
ameter ratio
- --. - -
Plate columns No Equilibrium data Flow rate >lOO:l 15
Superficial vapor Diameter 1O:l
velocity
.- -____
Plate-and-frame Yes Cake resistance Flow rate >lOO:l 20
filters or permeabilit) Filtration area >lOO:l
- - - -
llcboilers No Temperatures Flow rate >lOO:l 15
Viscosities Heat-transfer >lOO:l
area
- - - -
Reciprocating No Compression Flow rate >lOO:l 10
compressors ratio Power input >lOO:l
Piston dis- >lOO:l
placement
- .-
liotnry filters YCS Cake resistance Flow rate >lOO:l 20
or permeability Filtration area 25:l

Screw conveyors No Bulk density Flow rate 9O:l 20
Diameter 8:l
Drive horse-
power

Screw cxtruders No Shear rate Flow rate 100: 1 20
Power input 100: 1 10
_-
Sedimentation No Discharge Flow rate IO:1 20
centrifuges method Power input IO:1 20
- -
Settlers No Settling velocity Volume >lOO:l 15
Residence time
-_ .-
Spray columns No Gas solubilities Flow rate 1O:l 20
Power input
*