Municipal Water Distribution Residual Pressures - NY
Municipal Water Distribution Residual Pressures - NY
(OP)
I am evaluating a water distribution system on a college campus in New York and am struggling with pointing to a regulation that stipulates required residual pressures that need to be maintained during fire events. In particular - maintaining residuals in the system while a fire is somewhere else nearby (i.e. not maintaining a residual in the building on fire).
10 State Standards specifies a water system needs to maintain 20 psi "at ground level" under all flow conditions (including fire flows).
My concern is that providing only 20 psi at ground level will result in draining the upper portions of taller buildings on the campus. It seems to me that the intent of the regulations are to not create a health hazard resulting from a siphoning/back flow condition, however that is what would happen in taller buildings if pressures are reduced to 20 psi at ground level.
It seems that a prudent recommendation would be to install domestic booster pumps in the taller buildings to maintain positive pressure in the building's plumbing system during periods when the external water system's residual pressure is not sufficient to maintain adequate residuals in the building.
Can anyone help by directing me to a regulation/code that specifies that?
10 State Standards specifies a water system needs to maintain 20 psi "at ground level" under all flow conditions (including fire flows).
My concern is that providing only 20 psi at ground level will result in draining the upper portions of taller buildings on the campus. It seems to me that the intent of the regulations are to not create a health hazard resulting from a siphoning/back flow condition, however that is what would happen in taller buildings if pressures are reduced to 20 psi at ground level.
It seems that a prudent recommendation would be to install domestic booster pumps in the taller buildings to maintain positive pressure in the building's plumbing system during periods when the external water system's residual pressure is not sufficient to maintain adequate residuals in the building.
Can anyone help by directing me to a regulation/code that specifies that?





RE: Municipal Water Distribution Residual Pressures - NY
RE: Municipal Water Distribution Residual Pressures - NY
It doesn't have a treatment works, but it certainly has miles of distribution piping, large industrial and domestic demands and pump stations. It is significantly larger than many small communities I have worked for in the past that are held to 10 State Standards. The owner doesn't have any standards to speak of, and they really want a hard regulation or code to stand by to justify the cost of improvements. I need help finding that code.
RE: Municipal Water Distribution Residual Pressures - NY
FIRE-FLOW. The flow rate of a water supply, measured at 20 psig residual pressure, that is available for fire fighting.
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You will have to determine the building code that has been adopted in the location of your project. Search through the building code.
RE: Municipal Water Distribution Residual Pressures - NY
RE: Municipal Water Distribution Residual Pressures - NY
The link should clarify the issue.
A well-designed building is usually divided into pressure zones between eight to 10 floors per pressure zone depending on the floor-to-floor height. Given a 50-story building, the 50th floor usually has a governing pressure around 25 to 30 PSI and each story height of 10 feet adds 4.33 PSI to the pressure as you go down in the building from the top.
http://www.plumbingengineer.com/sept_09/code.php
RE: Municipal Water Distribution Residual Pressures - NY
RE: Municipal Water Distribution Residual Pressures - NY
www.newcomb-boyd.com/pdf/high-rise%20article.pdf
RE: Municipal Water Distribution Residual Pressures - NY
RE: Municipal Water Distribution Residual Pressures - NY
RE: Municipal Water Distribution Residual Pressures - NY