Chiller Sizing
2.4 gpm/Ton flow rate 
1 Chiller Ton = (gpm x dT)/24
12,000 btu/hr = 1 refrigeration ton

Tower Sizing
3 gpm/Ton flow rate based on (85 F Supply, 95 F Ret., 78 F WB)
1 Tower Ton = (gpm x dT) / 30 
15,000 btu/hr = 1 tower ton 

Pump Sizing
Pump Hp =   (gpm x dP) / (3960 x E)       Efficiency=0.65 to .75     delta P=psi x 2.31

Chiller Sizing for Molding
30 lb/hr HDPE = 1 Ton
35 lb/hr LDPE, PP, or Acrylic = 1 Ton
50 lb/hr PS, ABS, Acetal, PC = 1 Ton
75 lb/hr PVC = 1 Ton
40 lb/hr PET, Nylon, PPO, Urethane = 1 Ton

Chiller Sizing for Profile Extrusion
80 lb/hr PVC or ABS = 1 Ton
75 lb/hr PS = 1 Ton
50 lb/hr HDPE or PP = 1 Ton

Chiller Sizing for Blow Molding
40 lb/hr Polyolefins = 1 Ton

Extruder Cooling
Extruder Barrel Cooling = 1 Ton/inch
Extruder Feed Throat (3.5" = 1 Ton,   4.5" to 6" = 2 Tons)
Extruder Gearbox (2.5" = 1 Ton,  3.5" or 4" = 1.5 Tons)

Misc  Cooling
Hydraulics / Vacuum Pump (0.1 Ton/hp)
Air Compressor (0.1 Ton/hp)
Air Compressor  w/aftercooler (0.2 Ton/hp)
Machine Tools (0.1 Ton/hp)

Water Pipe Sizing (Based on 10' HD loss/ 100' pipe)
2 gpm ------1/2" pipe
5 gpm ----- 3/4" pipe
10 gpm --- 1" pipe
20 gpm --- 1-1/4" pipe
30 gpm --- 1-1/2" pipe
60 gpm --- 2" pipe
110 gpm -- 2-1/2" pipe
180 gpm -- 3" pipe
320 gpm -- 4" pipe
600 gpm -- 5" pipe
900 gpm -- 6" pipe
2000 gpm - 8" pipe