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Also as for "the water boards would not be very happy with you attaching a pump directly to the supply ".They are perfectly used to it. The pumps are called jet washers.
Could you not just connect up a hose and vary the angle to see how far it goes?
Quote from: Bored chemist on 30/07/2009 18:47:41Also as for "the water boards would not be very happy with you attaching a pump directly to the supply ".They are perfectly used to it. The pumps are called jet washers.Not according to a friend of mine who designs fire suppression sprinkler systems. If they need to use a pump it can only be connected to a local reservoir/storage tank.Jet washers do indeed use a pump, but to force a small amount of water at high speed through a small nozzle, not to draw more water from the supply - how are domestic jet washers normally connected to the water supply? Via a length of ordinary garden hose, which would collapse if the pump tried to draw too much water through it - they're designed and manufactured to withstand moderate internal pressure, not external pressure - try standing on one. The hose from the jet washer unit does have to be strengthened though, as once it's full of water it'll be under high pressure.
Oops - I should have said reduce the pressure in them, not increase the pressure. In any case, you still risk damaging the supply pipes and affecting the supply to other people.