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We have a project which is on a steep slope (the bottom of the site is about 120 feet lower than the top of the site). If we attach a fire main to the bottom of the site, the fire pump we have won't have much issue with keeping the city pressure at a 20 psi minimum or above.
If we attach to the water grid at with the fire service main at the top elevation of the site, we will probably need a suction control valve in order to keep the city pressure at 20 psi at the top elevation since the available water supply is so low. My question is - if we pull pressure on a city's system at the low elevation, do we have to chart and consider the rest of the water supply network? There's a chance if we pull the water supply down to 20 psi at the lower elevation that the system at the higher elevations would be well below the 20 psi due to elevation pressure loss. Thanks for your input! Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
2 Comments
Wayne Ammons
10/29/2019 07:11:09 am
I'm trying to visualize what the underground piping looks like on your project from the connection to the city main to the fire pump and building being protected. Are there any backflow preventers and at what point does the water become private and not controlled by the local water purveyor?
ANON.
11/6/2019 08:15:27 am
In this case if the tap at the street gets down to 20 psi, then portions of that same city system just up the street (at 120 feet higher elevation) should be pulled well below the 20 psi, right? Leave a Reply. |
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