Todd,
Then I would be very concerned.
What this suggests to me is that the available water supply is not
capable of delivering the pressure required.
Now why it can't do so is worthy of investigating. Some things which
come immediately to mind are a completely or partially closed valve,
which limits the pressure delivered to the riser, or a reduction by the
water purveyor in the pressure supplied, or perhaps expansion of the
supply system in the particular area resulting in pressures which do not
meet the demand to adequately supply the sprinkler system.
For me, it's enough to just note that the pressure has been reduced from
what the system was originally designed with, and why.
I relate a situation some years back where a development in San Diego
county compromised the water supply to the point where more than a dozen
warehouse buildings had to provide a fire pump to meet the demand of
their ESFR systems.
Find out why, Todd,
*Ken Wagoner, SET*
*Parsley Consulting
500 West Mechanic Street
Harrisonville, Missouri 64701-2235*
*Phone: (760) 745-6181 *
*Visit the website
<https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1>*
On 9/22/2022 5:06 PM, Fpdcdesign wrote:
The pressure requirement on the placard is higher than the static
pressure on the riser.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 <tel:860-535-2080> (ofc)
860-554-7054 <tel:860-554-7054> (fax)
860-608-4559 <tel:860-608-4559> (cell)
On Sep 22, 2022 at 5:38 PM, <Taylor Schumacher
<mailto:[email protected]>> wrote:
Todd, if I’m reading this correctly that means you have a safety
margin on your system. That’s a good thing that your system provides
more pressure than is required.
It would be cause for concern if the gauge showed less than required.
*Taylor Schumacher *
*From:* Prahl, Craig <[email protected]>
*Sent:* Thursday, September 22, 2022 4:03 PM
*To:* Discussion list on issues relating to automatic fire sprinklers
<[email protected]>
*Subject:* [Sprinklerforum] Re: [EXTERNAL] Pressure on placard
greater that static.
Um, that’s not an unusual thing. Pretty standard.
Craig Prahl |Jacobs| Group Lead/SME – Fire Protection |
[email protected] <mailto:[email protected]>|www.jacobs.com
<http://www.jacobs.com/>
1041 East Butler Road Greenville, South Carolina 29606
CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS
*From:* Fpdcdesign <[email protected]>
*Sent:* Thursday, September 22, 2022 4:48 PM
*To:* Discussion list on issues relating to automatic fire sprinklers
<[email protected]>
*Subject:* [EXTERNAL] [Sprinklerforum] Pressure on placard greater
that static.
I have run into a couple of situations where the required pressure as
shown on the system placard is less than the static pressure on the
riser. I found another one today during a survey. If others are
finding this, how do they handle it?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 <tel:860-535-2080> (ofc)
860-554-7054 <tel:860-554-7054> (fax)
860-608-4559 <tel:860-608-4559> (cell)
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