psi wont stay up
psi wont stay up
(OP)
hello,
im working on a test station to measure water flow of irrigation parts at 20 psi . problem is that when i start testing parts that put out 14 gph and higher (up to 60gph) i cant get to 20 psi. i have a pressure releif valve in front of the regulator and the small procon series 1 pump has a pressure releif vale too. am i putting out the same amount of water that im putting in on the larger volume parts? would a larger pump be the answer?
any help would be appreciated.
im working on a test station to measure water flow of irrigation parts at 20 psi . problem is that when i start testing parts that put out 14 gph and higher (up to 60gph) i cant get to 20 psi. i have a pressure releif valve in front of the regulator and the small procon series 1 pump has a pressure releif vale too. am i putting out the same amount of water that im putting in on the larger volume parts? would a larger pump be the answer?
any help would be appreciated.





RE: psi wont stay up
RE: psi wont stay up
You need a pump that can deliver a 50 ft discharge head (apx 20 psi with water) at the maximum flowrate you want to be able to run through your test station.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
happy new year!
RE: psi wont stay up
Normally this is the case when pressure testing systems to higher pressure, I assume even at the lower pressure air is still an issue. You will need some vents at the high points of the system to bleed the air out.
Greg Lamberson
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: psi wont stay up
Air is pretty compressible and in this case it would delay the pressure traverse across the system through the liquid having to compress the gas.
David
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
RE: psi wont stay up
RE: psi wont stay up
RE: psi wont stay up
When you test a pipeline system and there is air in the system you cannot get a good test or get up to test pressure. That is the reason you must evacuate all of the air from the system and do air volume calculations to validate it.
Air is compressible, but in a closed system not nearly as much so as water. Air will cause you big headaches when hydrotesting.
Greg Lamberson
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: psi wont stay up
David
RE: psi wont stay up
You are saying water is compressible? More compressible than air?
Charlie
www.facsco.com
RE: psi wont stay up
Don't go off on that tangent.
We all know water is slightly compressible and air very much so.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
RE: psi wont stay up
http://proconpumps.com/Series%201.htm
The pump is not undersized.
tell us exactly how it is set up... from supply to outlet, what is in between?
Charlie
www.facsco.com
RE: psi wont stay up
The OP's statement implies that all he wants to do is to get to 20 psi, ie 50 ft head at ONE GPM maximum. That flow and head is micro watt power and probably not the kind of pump where you have the option to buy a new motor. Neither is it the kind of pump or motor worth spending any time on repairing.
Its not the motor. I feel if the motor was turning, he wouldn't be writing us. If its turning at all, its making 0.02 horsepower and that's all it needs to make to get 20 psi and 1 gpm with the right pump.
If this garden fountain pump doesn't work, he needs to scrap it and buy a new unit.... one with the right head and flow. That will be the only cost effective solution.
No air, probably no clogged filter, probably no motor problem. End of story.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
what do you mean when you say that "outlet is opened and part is applied"?
Is the pump generating pressure at dead head?
Charlie
www.facsco.com
RE: psi wont stay up
I see that Palecactus can't get his facts straight.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
Palecactus,
Sounds to me, from what I read... that the system does not NEED to go past 4.4 psi.
Perhaps if the oulet valve was postiioned at the outlet of the "part". Then, the outlet valve is slowly closed to increase the pressure......
maybe, yet I'm lost.
Charlie
www.facsco.com
RE: psi wont stay up
David
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
As David pointed out, use the Red Flag option. Management is indeed very responsive to red flags. There's even a little box to type in some comments as to why you think a post should be removed or you can request the entire thread to be removed.
jt
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
Several of us went on a mission a couple of years ago to try to be the first responder to unclear/incomplete posts and ask the OP to clear up their question prior to people making-up stuff to fill in details. You won't believe the grief we got from other regular members. A couple of us still do it sometimes, but it rarely does any good. Too often the OP will ask an incomplete question and then go away and never respond in the thread again.
The only thing that I've found that works is to respond to the discussion instead of the OP (and often be accused of taking the conversation into the weeds when I ask a responder if they really believe that water is more compressible than air).
David
RE: psi wont stay up
No, I realized I made a mistake in my wording but by the time I logged back in, the thread had deteriorated to sniping. I simply mentioned that air in the system could be a potential problem as air is a problem in hydrostatic testing as it occasionally prohibits reaching nad maintaining the required test pressures and it can also cause an air-lock in the system. I, obvioulsy mistakenly, thought that since the system could not reach the required pressure, one of the things that could be looked at was air in the system.
I no longer responded because a member made the comment of going off on a tamgent. I understand how water and air interact in a closed system and again made a mistake in the wording of my post, my apologies and I'll purpose to not make a mistake again.
Greg Lamberson
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: psi wont stay up
RE: psi wont stay up
Palecactus, I didn't intend to be "critical", just critical...and nothing personal intended. You gotta' admit you muddied the water with the posts after "happy new year" and confused most all of us. That's all. In any case, glad you got everthing worked out and we all hope its a start for a good coming year.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
Never change more than one thing at a time.
And please, I'm just curious so don't start ripping me apart. I look at the pump curves, and see a pump that has the output capabilities. Why would you scrap the pump before changing the regulator?
Charlie
www.facsco.com
RE: psi wont stay up
Without knowing the system curve it is impossible to say that the pump has the output capabilities.
RE: psi wont stay up
http://www.proconpumps.com/Series%201.htm
If the pump's not meeting its specifications, then you need to get a new pump.
TTFN
RE: psi wont stay up
FACS did not make the original post and that's the only data sheet I see referenced in this thread.
I have no idea why FACS posted that.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
That's what I was thinking, and that's why I posted the same page.
I'm trying to get the set-up so I can get an idea of what the system looks like.
I've designed and tested many pumps,If we know how the system is organized, we might get a picture at what's wrong.
But I suppose I'm giving up on this thread... seems like a lost cause now.
Charlie
www.facsco.com
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
TTFN
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
TTFN
RE: psi wont stay up
Is there one part or multiple parts on a header?
Or is this thread dead?
RE: psi wont stay up
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: psi wont stay up
Thank you, that was kind
Charlie
www.facsco.com