Air Receiver Capacity in Cubic Feet of Free Air at Various Pressures
| 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.
| A) Contant Speed Operations: | Tank Size (ft³) + (Compressor Flow (CFM) / 7) |
| B) Typical Sizing Formula: | Vr = 14.7t(Qr-Qc) / (Pmax – Pmin) Where: |
| 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. |
NEMA Frame Sizes |
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| 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 | |||||||||