Pressure and GPM - Designing System

[muddywater]

Originally Posted by 1idejim

Nope, i am not an internet contractor.

Rule of thumb is 2psi per 5 ft
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I doubt the op had a 100 ft high mountain in the backyard he was working with. Realistically, probably a 30' rise at most whereas .06 of lb pressure isn't going to amount to didley squat. NOW if he was building a water tank in his client's back yard he just might need your expertise!

Rule of thumb is still off by .03 psi.

Cool job we are working on. I need to get a pic of all 91 heads in this sections running at once.

[1idejim]

Right is right, wrong is wrong. Generally rule of thumb is where we find a sweet spot for daily use.

That doesn't excuse sleeping in class.
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[muddywater]

Originally Posted by 1idejim

Right is right, wrong is wrong. Generally rule of thumb is where we find a sweet spot for daily use.

That doesn't excuse sleeping in class.
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Well if right is right and wrong is wrong then your rule of thumb is wrong. If i ever install irrigation with a poc at the bottom of a mountain, i will just google it like you did.

[1idejim]

Originally Posted by muddywater

Well if right is right and wrong is wrong then your rule of thumb is wrong. If i ever install irrigation with a poc at the bottom of a mountain, i will just google it like you did.

Don't you ever call me a liar punk
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[muddywater]

Time to pour you a liquor drink mr jim. You must have one hell of a better memory than all the rest of us. Either that or you install alot of pipe up mountains.

[muddywater]

Originally Posted by 1idejim

If you are being conservative use 0.433 per ft. instead of .5

6.70 psi per hundred ft. difference
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Actually .5 is more conservative than .433 when going up an incline. I am banking on a 50 lb pressure loss with .5 and you are banking on a 43 lb pressure loss per 100'. 6.7 psi of gravy.

[txirrigation]

Originally Posted by muddywater

Well if right is right and wrong is wrong then your rule of thumb is wrong. If i ever install irrigation with a poc at the bottom of a mountain, i will just google it like you did.

Rule of thumb is a Jim Crow law pertaining to the size of stick you could beat your wife with; as it could be no thicker than your thumb. Therefore by saying "rule of thumb" he means a rough measurement that is quick....

.... holy crap, that was the first time I actually used my expensive degree.


In the real world of installing there are a lot of "rule of thumb" measurements made. If you would like to walk onto a commercial job site and stop everything to get scientific more power to you, but you'll go broke quick. Making quick judgement calls based on experience and knowledge you can recall quickly is what separates the Men from the Boys. Having a solid "rule of thumb" list invaluable.

[muddywater]

Originally Posted by txirrigation

Rule of thumb is a Jim Crow law pertaining to the size of stick you could beat your wife with; as it could be no thicker than your thumb. Therefore by saying "rule of thumb" he means a rough measurement that is quick....

.... holy crap, that was the first time I actually used my expensive degree.


In the real world of installing there are a lot of "rule of thumb" measurements made. If you would like to walk onto a commercial job site and stop everything to get scientific more power to you, but you'll go broke quick. Making quick judgement calls based on experience and knowledge you can recall quickly is what separates the Men from the Boys. Having a solid "rule of thumb" list invaluable.

Well I agree. I doubt I will be able to get .433 out of my head for awhile now(many thanks jim), but I was always able to remember 1/2 lb per foot. And that is a more conservative number when going uphill.

[1idejim]

You're welcome
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