Sites: GlobalSpec.com | GlobalSpec Electronics | CR4 | Electronics360
Login | Register
The Engineer's Place for News and Discussion®

Previous in Forum: Sharpening of ceramic parts.   Next in Forum: Calculating the GPM to Cool a 250,000 BTU Coil
Close

Comments Format:






Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







11 comments
Anonymous Poster

Standing Head Pressure in PSI

06/04/2008 7:06 PM

I need to find the standing head pressure in psi of water in a pipe I am hydrostaticly testing......any help?

Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
2
Guru
Engineering Fields - Marine Engineering - New Member

Join Date: May 2007
Location: Australia.
Posts: 1082
Good Answers: 41
#1

Re: head pressure

06/04/2008 10:23 PM

psi head pressure

Regards JD.

Reply Good Answer (Score 2)
Power-User

Join Date: Mar 2007
Location: South East of Las Vegas just far enough to see the lights but far enough to not hear the coins falling
Posts: 272
Good Answers: 8
#2

Re: Standing Head Pressure in PSI

06/05/2008 11:08 PM

2.7 psi per vertical feet of elevation in your pipe.

__________________
Rule number one; Never ask a question unless you are prepared for an answer that you may not like.
Reply
Member

Join Date: Apr 2008
Posts: 6
#7
In reply to #2

Re: Standing Head Pressure in PSI

06/09/2008 5:05 PM

I thought it was 2.31 vertical feet per psig but I am probably wrong again.

Thanks

Reply
Power-User

Join Date: Mar 2007
Location: South East of Las Vegas just far enough to see the lights but far enough to not hear the coins falling
Posts: 272
Good Answers: 8
#11
In reply to #7

Re: Standing Head Pressure in PSI

06/13/2008 10:10 PM

Literally you are correct but a little "Murphy" does not hurt. As a fast rule of thumb is use 3'.

__________________
Rule number one; Never ask a question unless you are prepared for an answer that you may not like.
Reply
2
Power-User
Popular Science - Weaponology - New Member

Join Date: Jan 2006
Location: Fredericksburg, Virginia USA
Posts: 234
Good Answers: 1
#3

Re: Standing Head Pressure in PSI

06/06/2008 1:32 AM

A rule of thumb I use in my trade is .433 lbs./ft. If you know the height of your water column, head pressure is easy to determine.

__________________
See Bio for signature line........political correctness and insecure people are such a pain-in-the-ass.
Reply Good Answer (Score 2)
Active Contributor

Join Date: May 2008
Posts: 12
#4

Re: Standing Head Pressure in PSI

06/06/2008 10:54 AM

The density of water is 0.0361 lbs per cubic inch. Convert you height into inches, and multiply by 0.0361 and you will get lbs per inch squared head pressure. This will give you a more accurate value, for example, 2.31ft has a head pressure of 1.000692 psi.

Head pressure of 12' of water;

12' = 144"
144" x 0.0361 lbs/cubic inch = 5.1984 lbs/inch squared

Reply Score 1 for Good Answer
Power-User

Join Date: Oct 2007
Location: lat. 40N lon. 124W
Posts: 364
Good Answers: 5
#5

Re: Standing Head Pressure in PSI

06/06/2008 11:21 AM

number one has the best answer so far. the one i use, is that 100 feet of head gives approximatly 35 psi, which is what municipalities try to supply.

__________________
“There is always an easy solution to every human problem — neat, plausible and wrong.” H. L. Mencken……………………. that's Conventional Wisdom for you. Often wrong, but never in doubt.
Reply
Active Contributor

Join Date: May 2008
Posts: 12
#6
In reply to #5

Re: Standing Head Pressure in PSI

06/06/2008 11:28 AM

In my line of work, those extra decimals in my equation are vital. We cannot afford to approximate anything. Once we do that, bad things happen.

100' is more than 35 psi

Reply
Power-User

Join Date: Oct 2007
Location: lat. 40N lon. 124W
Posts: 364
Good Answers: 5
#8
In reply to #6

Re: Standing Head Pressure in PSI

06/11/2008 2:15 PM

i stand corrected. thank you. so, what is the psi at 100'?

__________________
“There is always an easy solution to every human problem — neat, plausible and wrong.” H. L. Mencken……………………. that's Conventional Wisdom for you. Often wrong, but never in doubt.
Reply
Active Contributor

Join Date: May 2008
Posts: 12
#10
In reply to #8

Re: Standing Head Pressure in PSI

06/13/2008 9:28 AM

100' x 12 = 1200"

1200" x 0.0361 lbs/cubic inch = 43.32 psi

Reply
Participant

Join Date: Jun 2008
Posts: 4
#9

Re: Standing Head Pressure in PSI

06/12/2008 9:24 PM

I do a fair amount of hydro testing of boilers & pressure vessels. Some as high as 170 feet. The accepted standard in and around my industry is the .433 / foot.

Reply
Reply to Forum Thread 11 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

artbyjoe (2); jdretired (1); miketheboilerguy (2); moron (1); oldwheels (1); water buffalo (1); z28summit (3)

Previous in Forum: Sharpening of ceramic parts.   Next in Forum: Calculating the GPM to Cool a 250,000 BTU Coil
You might be interested in: Pressure Regulators, Pressure Gauges, Pressure Intensifiers