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post #31 of 67
Quote:
Originally Posted by ira-k View Post
Yeah you can probably rig up something like that, its kind of like a water level....


I don't think I have any 1/2" Y's or I would send you one..If you ever do want to get a gauge they have the 0-15psi and McMaster-Carr...They have a 1/8" male on the bottom so what I did was get a 1/2-1/2 tube x 1/4" male npt on top and use a 1/4-18" reducing coupling...You can get them with 1/4"npt male fittings but they are 2" dial and the 1/8" is a 1.5" dial and I wanted the smaller one....I think they are +- 1% at mid gauge read-out...

Thanks!
Might have to do that, I'll search around town first, but I'm guessing that's not a very common item.
    
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post #32 of 67
All I could find locally here were 0-30 or 40psi....They are on page 551 they are the NIST certifed with +- 2% accuracy mid-gauge accuracy...I just looked at them again....
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post #33 of 67
Oh and they have flow meters on page 511 too...too many toys..
    
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post #34 of 67
Quote:
Originally Posted by Martinm210 View Post
Oh and they have flow meters on page 511 too...too many toys..

Yeah I almost bought one the roto-meters a while back but a $150 bux is just to much for me to play with one in my loop...Especially when a pressure gauge will do the same thing for less then $20 bux....
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post #35 of 67
Quote:
Originally Posted by ira-k View Post
Yeah I almost bought one the roto-meters a while back but a $150 bux is just to much for me to play with one in my loop...Especially when a pressure gauge will do the same thing for less then $20 bux....
Yeah, it's too much money. But I still believe you can't say double pressure equals double the flow rate, but give me a chance to show you first

I should be able to measure the pumps pressure head with one pump and two in series by simply measure how far it can push up a tube, even if it means I have to break out the 20' ladder..lol I'll show you I'll have twice the pressure head in series then I'll hook it up to a loop and show you how the flow rate isn't anywhere near double that of a single pump(should be around 30% more with a restrictive system)

I'll bet you 5+ reps I'm right..lol... Deal
    
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post #36 of 67
Yeah you can convert the head reading to psi then run them in series......Deal......I might not truely believe it till I do it myself but I will trust your integrity for your test....

EDIT: Isn't it a 1" tube that they use to check the vertical water colum for head? Or is it 3/4"...
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post #37 of 67
"Should" be a 1" ... should is the operative word here ... heh !
post #38 of 67
Quote:
Originally Posted by ira-k View Post
Yeah you can convert the head reading to psi then run them in series......Deal......I might not truely believe it till I do it myself but I will trust your integrity for your test....

EDIT: Isn't it a 1" tube that they use to check the vertical water colum for head? Or is it 3/4"...
It doesn't matter what size. 1/4" or 1".. pressure head is the same measure in feet of H20. Water weighs 62.4 pounds per cubic foot. If you had a four cubic foot column of water that would be 249.6 lbs of water spread over 1 square foot or 1.733 PSI. Now do the same for a 1 inch square column of water stacked 4' tall. Water is again 62.4 lbs/cubic foot or .0361111 lbs per cubic inch (1728 cubic inches per cubic foot). Now you need 48 little cubic inches of water stacked...(48*.03611111)..that's still 1.733 PSI.
    
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post #39 of 67
Why do they use 1" tubing when they test for head then?
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post #40 of 67
We use 3/4"OD x 1/2"ID Tygon on our tanks at work ... and they are quite large tanks at that. About 6000 gallons on the smaller ones ... we hafta close off the bottom tap ... just in case the tubing decides to rupture when nobody is around to catch it ... would make for a huge mess if it wasn't found for a few hours !
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