My thoughts exactly, Mr Prahl.
>
> On Feb 11, 2021 at 3:46 PM, <Craig/GVL via Sprinklerforum Prahl
> (mailto:[email protected])> wrote:
>
>
>
> If I have 4-heads of OH2 in a 500 sf space I have to calc it and size
> everything as if I had a 1500 sf design area. Where’s the value? What greater
> level of Life Safety is provided? You should only have to calculate the
> actual area up to the prescribed area and not add some fictitious value,
> “just because”. Maybe we should just design everything using ESFR sprinklers,
> then you’d get all the flow you need. Craig Prahl | Jacobs | Group Lead/SME –
> Fire Protection | [email protected]
> (mailto:[email protected])<mailto:[email protected]> |
> www.jacobs.com (http://www.jacobs.com)<http://www.jacobs.com/> 1041 East
> Butler Road Greenville, South Carolina 29606 (x-apple-data-detectors://6)
> CONTACT BY: email or MS TEAMS From: [email protected]
> (mailto:[email protected]) <[email protected]
> (mailto:[email protected])> Sent: Thursday, February 11, 2021 3:22
> PM To: [email protected]
> (mailto:[email protected]); [email protected]
> (mailto:[email protected]) Cc: Prahl, Craig/GVL <[email protected]
> (mailto:[email protected])> Subject: RE: [EXTERNAL] RE: Multiple System
> Calculation Tracey Bellamy, I believe, was the one to propose it. It had to
> deal with a loading dock and then having to grab ESFR sprinklers in the
> warehouse to get the 1950 sq ft if I recall correctly. I read the report a
> couple years ago. I see where he was coming from. The intent was good. But, I
> think there are a lot of unintended consequences from that section. Travis
> Mack, CFPS, CWBSP, RME-G, COC, SET Engineering Manager MFP Design 3356 E
> Vallejo Ct Gilbert, AZ 85298 (x-apple-data-detectors://15/0) 480-505-9271
> ext. 700 (tel:480-505-9271;700) C: 480-272-2471 (tel:480-272-2471)
> [email protected]
> (mailto:[email protected])<mailto:[email protected]>
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> From: Sprinklerforum <[email protected]
> (mailto:[email protected])<mailto:[email protected]>>
> On Behalf Of Prahl, Craig/GVL via Sprinklerforum Sent: Thursday, February
> 11, 2021 1:20 PM To: [email protected]
> (mailto:[email protected])<mailto:[email protected]>;
> [email protected]
> (mailto:[email protected])<mailto:[email protected]>
> Cc: Prahl, Craig/GVL <[email protected]
> (mailto:[email protected])<mailto:[email protected]>> Subject: RE:
> [EXTERNAL] RE: Multiple System Calculation This is something that really
> needs to be looked at I future editions of NFPA 13. I know we've had this
> discussion many times. I would love to hear how this came about. It offers no
> benefit to an owner and only increases cost. Craig Prahl | Jacobs | Group
> Lead/SME – Fire Protection | [email protected]
> (mailto:[email protected])<mailto:[email protected]> |
> www.jacobs.com (http://www.jacobs.com)<http://www.jacobs.com> 1041 East
> Butler Road Greenville, South Carolina 29606 (x-apple-data-detectors://34)
> CONTACT BY: email or MS TEAMS -----Original Message----- From: Sprinklerforum
> <[email protected]
> (mailto:[email protected])<mailto:[email protected]>>
> On Behalf Of Bob Knight via Sprinklerforum Sent: Thursday, February 11,
> 2021 2:24 PM To: [email protected]
> (mailto:[email protected])<mailto:[email protected]>
> Cc: Bob Knight <[email protected]
> (mailto:[email protected])<mailto:[email protected]>> Subject:
> [EXTERNAL] RE: Multiple System Calculation Joe, The AHJ's interpretation
> sounds incorrect. What is supposed to take place is as follows: 23.4.4.2.5
> Where the total design discharge from these operating sprinklers is less than
> the minimum required discharge determined by multiplying the required design
> density times the required minimum design area, an additional flow shall be
> added at the point of connection of the branch line to the cross main
> furthest from the source to increase the overall demand, not including hose
> stream allowance, to the minimum required discharge. In other words, we are
> now required to add additional flow to calculations when we are in a
> situation like yours. The minimum required flow for a 1500 sf design area for
> OH1 is 210 gpm, and the minimum required flow For 1950 sf is 292.5 gpm. If
> your areas are not flowing these minimus you will need to add the additional
> flow as stated above. It's a pain in the neck but other than one more step in
> the calc that's it. Thank you, Bob Knight, CET III Fire by Knight, LLC
> 208-318-3057 (tel:208-318-3057) -----Original Message----- From:
> Sprinklerforum [mailto:[email protected]] On
> Behalf Of Joe Burtell via Sprinklerforum Sent: Thursday, February 11, 2021
> 11:47 AM To: [email protected]
> (mailto:[email protected])<mailto:[email protected]>
> Cc: Joe Burtell Subject: Multiple System Calculation I have a situation
> where an engineer is telling me I have to calculate a wet and dry system
> together because neither space meets the 1500 s.f minimum. I have a penthouse
> mechanical room OH 1 (WET) of 1014 s.f. and an adjacent room OH1 (DRY) of 469
> s.f. I have calculated each room separate of each other. There is a
> full-height wall with a door that separates the rooms. The wall and door are
> not fire rated, so the large room method is out. This does not make any sense
> to me. Any sections that would require this to be done. He is saying 11.1.2
> of NFPA 13 2016 requires it. I argue exception #2 says it does not apply.
> Best regards, *Joe Burtell, SET, CFPS* [image: Burtell Fire_Small] Phone |
> Fax | Mobile| Text *406-204-4653 (tel:406-204-4653) <++1-406-204-4653>*
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