Reza:
Isn't the pump size going to be driven by your standpipe? Or is it a
manual wet standpipe and the fire dept connection is your supply? If
the pump is going to be solely based on the sprinklers, does your local
code permit small orifice sprinklers. For example, if your project is an
office, you may be able to use 4.2k sprinklers and cut down the discharge.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected]
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On 2/9/2017 5:55 AM, Tim Stone wrote:
Reza,
Two separate calcs are needed.
One to prove the Standpipe demand at 65 PSI.
Then Calculate the Sprinkler system by itself.
The fire pump will be designed based on the highest demand. Usually
the Standpipe requirements will determine the fire pump needed.
Regards,
*G. Tim Stone*
*/G. Tim Stone Consulting, LLC/*
*NICET Level III Engineering Technician*
*Fire Protection Sprinkler Design*
*and Consulting Services*
* 117 Old Stage Rd. - Essex Jct., VT. 05452*
*CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343*
[email protected] <mailto:[email protected]>
*From:* Sprinklerforum
[mailto:[email protected]] *On Behalf Of
*Reza Esmaeili
*Sent:* Thursday, February 9, 2017 7:05 AM
*To:* [email protected]
*Subject:* Reducing Sprinklers' Pressure in a Combined
Standpipe/Sprinkler System
Hi forumites,
As per NFPA 14, in a combined standpipe/sprinkler system, the minimum
pressure at the outlet of most remote 1 1⁄2 in. hose station should be
65psi. As standpipe and sprinkler riser in shared, I want to reduce
the pressure to the sprinklers to around 15psi in order to reduce the
total sprinklers flow demand and finally to select a smaller fire pump.
What is the most cost-effective way to do that? Can I use a
restrictor? For example, if the main sprinkler pipe at each floor is
3", can I install a short 1" pipe just at the beginning to reduce
sprinklers pressure. Can I do that? I checked this in a hydraulic
calculation software and in works fine, but I am not sure if this is a
right way.
Best,
Reza
www.sarian.ir <http://www.sarian.ir>
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