Niccoleman
New Member
Lowara 16GS40/B 3-phase 4kW pump. This is rated at 8 to 22 m3/hr at 83 to 25 m head.
Flexiline riser. 200’ down borehole. Pumping up to 18,000 gallon reservoir where there is a level switch. Pressure at borehole head while pumping is 2bar.
We use 80 to 100 m3/day for a couple of farms and villages on our Estate. Our system was built in 1943 by Italian Prisoners of War, 20 miles of underground pipework dug all in by hand! in 1943 a 15 hour test yielded 7m3/hour to empty, restored level to 130’ in 25 mins.
Problem in drought conditions that we now have every summer is that a Water Company has deep boreholes nearby that lower the static water level in chalk aquifer now that nearby towns have doubled in size. And then charge us £2/3m when we have to switch over to their mains.
We pump 12 m3/hr (3000 US gallons) but only need to draw an average of 4 m3/hour. (1,000 USG)
Pumping at 12 m3/hr is ok in winter but in this drought we are pumping 50% air and 50% water so too fast for the level to recover. Only want 4 or max 6 m3/hr.
Dry running protection provided by Guardian 2E control box, but this does not help the borehole itself.
Counter-intuitive but a lower rate of flow should increase available water, also will save wear on pump, and save damage to borehole.
Questions are will a choke burn more electricity or less?
What pressure will it be safe to have at wellhead without damage to pump or burst riser?
Is it preferable instead of choking the flow to fit a time delay cyclic relay, wired into the float switch line. Say 15 minutes on (which is max time before flow starts to fail) and 30min off, for level recovery. I guess this would save electric which currently is costing us £10,000 a year?
Flexiline riser. 200’ down borehole. Pumping up to 18,000 gallon reservoir where there is a level switch. Pressure at borehole head while pumping is 2bar.
We use 80 to 100 m3/day for a couple of farms and villages on our Estate. Our system was built in 1943 by Italian Prisoners of War, 20 miles of underground pipework dug all in by hand! in 1943 a 15 hour test yielded 7m3/hour to empty, restored level to 130’ in 25 mins.
Problem in drought conditions that we now have every summer is that a Water Company has deep boreholes nearby that lower the static water level in chalk aquifer now that nearby towns have doubled in size. And then charge us £2/3m when we have to switch over to their mains.
We pump 12 m3/hr (3000 US gallons) but only need to draw an average of 4 m3/hour. (1,000 USG)
Pumping at 12 m3/hr is ok in winter but in this drought we are pumping 50% air and 50% water so too fast for the level to recover. Only want 4 or max 6 m3/hr.
Dry running protection provided by Guardian 2E control box, but this does not help the borehole itself.
Counter-intuitive but a lower rate of flow should increase available water, also will save wear on pump, and save damage to borehole.
Questions are will a choke burn more electricity or less?
What pressure will it be safe to have at wellhead without damage to pump or burst riser?
Is it preferable instead of choking the flow to fit a time delay cyclic relay, wired into the float switch line. Say 15 minutes on (which is max time before flow starts to fail) and 30min off, for level recovery. I guess this would save electric which currently is costing us £10,000 a year?