Technical Aids

 

Air Receiver Capacity in Cubic Feet of Free Air at Various Pressures

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CAPACITY PRESSURES (in pounds)
GALS. CU. FT. 75 100 125 150 200 250
30 4.0 20.5 27.3 34.2 41.0 54.7 68.3
60 8.0 41.0 54.7 68.2 82.0 109.4 136.7
80 10.7 54.7 73.0 91.2 109.4 146.0 182.4
120 16.1 82.0 109.3 136.2 164.0 218.7 273.3
200 26.8 136.7 182.2 227.8 273.4 364.5 455.6
240 32.2 164.0 218.7 273.4 328.0 437.4 546.7
400 53.6 273.4 364.5 455.6 546.7 729.0 911.2
660 88.4 451.0 601.4 751.7 902.1 1202.8 1503.4
1060 142.0 724.4 965.9 1207.3 1448.8 1931.7 2414.5
1600 214.4 1093.4 1457.9 1822.4 2186.9 2915.8 3644.8
2560 343.0 1749.0 2333.0 2916.0 3499.0 4665.0 5832.0

Capacities at other pressures are exactly in proportion. Example: at 200 lbs. pressure

the capacity of a given size tank is exactly double the capacity at100 lbs. pressure.

Gallons = cu. ft./.134 ••• cu. ft. = Gallons x .134.

Useful Formulas - Sizing a Tank   

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A) Contant Speed Operations:

Tank Size (ft³) + Compressor Flow (CFM)

                           ——————————

                                           7

B) Typical Sizing Formula:

Vr = 14.7t(Qr-Qc)

         —————

         Pmax – Pmin

Where:

t         = time (min) that receiver can supply required amount of air,

Qr      = consumption rate of pneumatice system (cfm),

Qc      = output flow rate of compressor (cfm),

Pmax  = maximum pressure level in reciever (psi),

Pmin   = minimum presssure level in receiver (psi),

Vr      = reciever size (ft3)

C) 7.48 Gallons = 1 ft³ Vol  
D) 14.5 psi - 1 BAR  

E) 35 CFM = 1 Meter³

                      ———

                         Min.

  
F) Pump Up Time:

Example: : Example – 5 hp compressor on an 80 gallon tank, pumping form 0-100 psig.

80 Gal. Tank                                                                     1066.67                                  

————— x (100 psig- 0 psig) = —————————————————— = 4 min

7.5 gal./ ft³                                      14.7 (the ATM Pressure) x 18 (the CFM of Unit)

 


NEMA Frame Sizes

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NEMA Frame Sizes
CAPACITY
(GAL.)
CAPACITY
(CU. FT.)

HORZ.
VERT.
NO
SLOTS
56
56H
143T
145T
182T
184T
213T
215T
254T
10
1.34
H
X
                  
15
2.01
H
X
                  
20
2.67
H
X
                  
30
4.01
H & V
  
X
X
X
X
          
60
8.02
H & V
        
X
X
X
X
    
80
10.70
V
        
X
X
X
X
    
80
10.70
H
            
X
X
X
X
120
16.04
H & V
            
X
X
X
X
200
26.74
H
X
                  
240
32.09
H
X
                  


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