water pressure ... expert...
Submitted: Friday, May 25, 2007 at 14:16
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Scoof
Could some of you please clarifie this for me.
I have a pump on the River and when the pump is switched off the pressure gauge show's 40 psi. or 2.8 bar..
I worked it out that the head pressure is 28 metre's is that right.
It dosn't look that far up to the house that's all.
Thanks for any help,
Scoof .... :-)
Reply By: Member - andrew B (Kununurra) - Friday, May 25, 2007 at 14:26
Friday, May 25, 2007 at 14:26
Gday Scoof
Sounds about right to me.....when the pump is turned off is the house end of the pipe open ie not under any pressure?
Cheers Andrew
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242314
Follow Up By: Scoof - Friday, May 25, 2007 at 14:33
Friday, May 25, 2007 at 14:33
Howdy Andrew ,
Thanks for reply and yes open ended pipe.
Scoof ... :-)
FollowupID:
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Reply By: sdr00y - Friday, May 25, 2007 at 14:50
Friday, May 25, 2007 at 14:50
That should be about right. The pressure gauge should read the head pressure. For every 10 psi there is 1 metre of head. That would work with your 2.8 bar = 28 metres. There might be some other losses which you could include if you wish, depending on the pipe and the amount of bends in it, but that would be negligible.
Also, does your gauge read truly? IE when there is no pressure on it at all, does it read zero? If it reads say 1 bar when it should be reading zero that could mean the house is only 18 metres above the river, but the untrue reading in the gauge gives you the impression the house is higher.
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Follow Up By: Scoof - Friday, May 25, 2007 at 17:13
Friday, May 25, 2007 at 17:13
I recon the gauge is right .
I just installed 2 gauge's one B4 the new filter and 1 after the filter and both read the same.
Cheers Scoof .. .. :-)
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Follow Up By: GerryP - Saturday, May 26, 2007 at 19:30
Saturday, May 26, 2007 at 19:30
It's actually 10 kpa for every metre in height and there's 6.895 (say 7) kpa for each psi. Therefore it's approximately .7 psi per metre. With the end of the pipe open and the pump off, the guage will register the vertical (read straight up) height of the water column. If the gauge is reading 40 psi then the vertical distance from the guage to the water level at the top of the pipe will be 28 metres (40 x 7=280 kpa then 280/10 = 28 metres)
Gerry
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Follow Up By: Scoof - Monday, May 28, 2007 at 10:00
Monday, May 28, 2007 at 10:00
Thanks GerryP, The hieght from river to pump outlet by eye dosn't look that high above River but it must be.
Cheers Scoof... :-)
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Reply By: Des Lexic - Friday, May 25, 2007 at 15:51
Friday, May 25, 2007 at 15:51
G'day
young Scoof,
The river height at our place is approximately 13metres above sea level and on the concrete pad that our tank sits on along side the neighbours driveway is 39metres above sea level. That info was on some plans that I saw at DEHAA or whatever they are now, so it would be accurate. That would make my head of water 26 meters so 28 meters would be about right at your place.
I'm waiting for all the Polar ice to melt so that I will have a sea front view. LOL
Imagine that, catching whiting off the front deck.
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Follow Up By: Scoof - Friday, May 25, 2007 at 17:10
Friday, May 25, 2007 at 17:10
Des if we don't get any rain soon the sea water might make it's way up to your place.
In the earliy 1900's the sea water made it's way up as far as Lock 1 was told the other day.
Don't know how true that is.
Cheers Mate and I like the
young bit.
Scoof .. .. :-)
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Reply By: Member - Stephen (WA) - Tuesday, May 29, 2007 at 23:53
Tuesday, May 29, 2007 at 23:53
If the guage is reading correctly, then it may
well be 28m difference in height.
Sometimes differences in elevation can be quite deceptive (especially when there aren't any steep slopes or cliffs). Gentler slopes can be quite tricky in this regard.
When I stand on a berm in an open pit and look down to the next one below - 20 metres is a loooong way down a very steep slope. However, standing on the top of a 20m high rehabilitated waste dump with gentle slopes doesn't look anywhere near as high.
Cheers
Stephen J
AnswerID:
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Follow Up By: Scoof - Wednesday, May 30, 2007 at 09:39
Wednesday, May 30, 2007 at 09:39
Howdy Steven , you are spot on as we have a gental slope from the house to the river.The slope is about a 5 min easy walk.
Thanks for the Reply.
Cheers . Scoof.. :-)
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