Alternative Technology Assn Forums

1. 

   petemoss
   Member

   Have been organising to get our water tanks off a pressure pump, and put up the hill a bit, and use gravity for pressure.

   The tank arrived today, and although I specified 50mm outlet, they made it 40mm (1.5 inch). What effect, if any, will this have on our water pressure ?. The outlet is to be hooked up to 50mm poly pipe.

   From memory, for every 23 inches of water head, you get one psi (I think), so the head will be the same as planned, but it will now be coming out of a 40mm outlet, not a 50mm outlet.

   Posted Wednesday 10 Apr 2013 @ 9:43:09 am from IP #
2. 

   Wendy
   Member

   Won't make a scrap of difference to your pressure. It will only limit the flow.
   Unless you want to turn every tap in the house on simultaneously you should have no problems.

   Posted Wednesday 10 Apr 2013 @ 12:18:36 pm from IP #
3. 

   Diver
   Member

   petemoss said:
   Have been organising to get our water tanks off a pressure pump, and put up the hill a bit, and use gravity for pressure.

   Ok...so how are you going to get the water into the tank?

   petemoss said:
   The tank arrived today, and although I specified 50mm outlet, they made it 40mm (1.5 inch). What effect, if any, will this have on our water pressure ?. The outlet is to be hooked up to 50mm poly pipe.

   Insignificant dynamic head loss.

   No static head loss.

   Posted Wednesday 10 Apr 2013 @ 4:01:51 pm from IP #
4. 

   petemoss
   Member

   Wendy, thanks for your reply. That's good then, that it won't affect the pressure. Our plumber confirmed that this morning, he said the wider the pipe, the less friction, so 50mm pipe is good.

   There is a fairly long distance from tank to house, at a guess, about 80 metres, all down hill of course.

   Posted Thursday 11 Apr 2013 @ 12:51:53 am from IP #

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