22 May 2017

Ram Pump

Data needed for choosing a ram pump

The AIDFI ram is the perfect solution for pumping water from lower points to higher elevations.  But……… since it operates without external energy like electricity or fuel and only on the power/energy of water, it needs FREE flowing water.

The ram can’t pump water from below the soil and therefore can’t in generally be used in the cities.  Also it can’t be connected to the water coming from the water districts pipe system since a ram only pumps a maximum of 40 % of the water passing through it to a higher elevation.  At an average the water pumped up is even only like 10%.

So we need flowing sources like springs, streams (creeks) and rivers.

Then we need to have a fall/drop or head from the source to the ram pump.  The falling water contains the energy to pump the water up.  This falling water is converted in the ram system into pressure.

A minimum of 1 meter head is required.  There are three possibilities:

  • There is already an immediate fall/drop/head
  • There is free flowing water but no immediate head.  Then it is necessary to measure if there is a head over a distance.  This is the case with gradual cascading creeks or rivers.  Over a certain distance there is a head between the target place for the ram and the source.  In such cases a diversion pipeline (with only a little slope) can be inserted in the system.  
  • There is free flowing water like a spring but no immediate or only a small fall/drop/head.  In some cases there are lower spots where there is a needed fall/drop/head.  A diversion pipeline can bring the water over a certain distance to such a spot.

If possible and there is knowledge how to do it, the head can be measured with a level hose, sticks and measuring tape.

Also we need to know the flow of the source, preferable in liters/minute.  Right now there are ten different sizes of ram pumps with each of them having a flow range.  With the flow measured a selection of the right size can be made.  Mostly we don’t have the luxury to measure several times a year to observe the possible variation in the flow during summer and raining season.  It is necessary to ask people living near the source about its behavior.

AIDFI in many cases prefers to install two smaller ram pumps placed parallel, rather then one big pump.  If properly selected, two pumps can accommodate the flow in the raining season and if the source decreases in flow in the summer, still one pump can operate.

If possible and again if there is knowledge how to do it, it would be the best to measure also the elevation from the target site for the ram to the place of delivery.  This can be done with a level hose, sticks and measuring tape.  AIDFI uses an altimeter or GPS for this purpose.

Then it would also be ideal to already measure the two distances:

  • From source to ram pump either direct or through the planned diversion.
  • From targeted ram pump to the place of delivery

If all these data are complete, an estimate can be made of the expected delivery in liters/minute.

3/4" 10 - 15 liters/minute Php 15,525.00
1" 15 - 30 liters/minute Php 17,250.00
1 1/4" 25 - 80 liters/minute Php 18,400.00
1 1/2" 60 -120 liters/minute Php 19,550.00
2" 90 - 200 liters/minute Php 26,450.00
2 1/2" 180 - 350 liters/minute Php 29,325.00
3" 200 - 480 liters/minute Php 34,500.00
4" 450 - 900 liters/minute Php 40,825.00
5" 900 - 1,300 liters/minute Php 51,750.00
6" 1,000 - 2,500 liters/minute Php 69,000.00