The Free On-line Aquaculture Dictionary

Hydram Pump Calculations

 Formulae Table
 Hydram Pump - Factors required for pump selection 1. The difference in height between the water source and the pump site (called vertical fall). 2. The difference in height between the pump site and the point of storage or use (lift). 3. The quantity (Q) of flow available from the source. 4. The quantity of water required. 5. The length of pipe from the source to the pump site (called the drive pipe). 6. The length of pipe from the pump to the storage site (called the delivery pipe). Once this information has been obtained, a calculation can be made to see if the amount of water needed can be supplied by a ram.  The formula is: D=(S x F x E)/L Where: D = Amount delivered in litres per 24 hours. S = Quantity of water supplied in litres per minute. F = The fall or height of the source above the ram in meters. E = The efficiency of the ram (for commercial models use 0.66, for home built use 0.33 unless otherwise indicated). L = The lift height of the point of use above the ram in meters.

The table below solves this formula (the result in the table is expressed in litres delivered in 24 hours) for rams with efficiencies of 66 percent, a supply of 1 litre per minute, and with the working fall and lift shown in the table.  For supplies greater than 1 litre/minute, simply multiply by the number of litres supplied.
 Working Fall (m) Lift - Vertical height to which water is raised above ram (m) 5 7.5 10 15 20 30 40 50 60 80 100 125 1.0 144 77 65 33 29 19.5 12.5 1.5 135 96.5 70 54 36 19 15 2.0 220 156 105 79 53 33 25 19.5 12.5 2.5 280 200 125 100 66 40.5 32.5 24 15.5 12 3.0 260 180 130 87 65 51 40 27 17.5 12 3.5 215 150 100 75 60 46 31.5 20 14 4.0 255 173 115 86 69 43 36 23 16 5.0 310 236 155 118 94 71.5 50 36 23 6.0 282 185 140 112 93.5 64.5 47.5 34.5 7.0 216 163 130 109 82 60 48 8.0 187 149 125 94 69 55 9.0 212 168 140 105 84 62 10.0 245 187 156 117 93 69 12.0 295 225 187 140 113 83 14.0 265 218 167 132 97 16.0 250 187 150 110 18.0 280 210 169 124 20.0 237 188 140