You are talking Class IV to 20'. I assume double row racks, 8' aisles, non-encapsulated.

That is 0.495/2000 for ceiling only sprinklers.

If you max out at 100 sq ft, you are basically 50 gpm / sprinkler.

If you use the 11.2 dry pendent sprinklers, you will have a starting pressure of about 20 psi.

Calculate 20+ sprinklers. The demand should be between 1000-1100 gpm. You will need 500 gpm demand in lieu of the 250 gpm demand for ESFR.

Your water supply seems strong enough to deliver 1500-1600 gpm with the pump you suggested.

That would give you the wet system, dry pendents, and the 11.2 dry pendent is less cost than your 16.8 dry ESFR

Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
fax: 866-430-6107
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On 9/18/2016 2:11 PM, 321 wrote:
Thanks Guys for all of the responses. This will shed some more light on this project:

Four weeks ago we didn't know this project existed. At the request of the owner we took on a "Cost Plus" project management arrangement to attempt to inject some sanity into the process.

The building is a Rigid Frame Steel Building...already built. There are about 54,000 square feet of coolers/freezers inside the building...90% built out. There is a remainder of 20,000 square feet of office and loading dock. The original conceptual design was nothing more than "Dots on a Page" and a note calling for an ESFR Antifreeze System. There is a preliminary rack plan but the Coolers may only be partially racked...rack height 20'...inside height of coolers is 26'. We have a few areas that we can raise pipe above the ceiling of the coolers and distribute pipe.

My initial concepts allows for 20' of storage in rack of Class IV utilizing ESFR 16.8 heads with a starting pressure of 35 PSI spaced 10 x 10 flowing 12 in rack required (Florida is still using NFPA 13 2010 edition). Water supply is 58/54/1150...I added a 1000 GPM @ 100 PSI pump. If I run a wet grid I can get a 10 psi safety factor using ESFR's dropping thru the top of the cooler. I priced the ESFR 16.8 Heads and the owner was...well "Blown Away".

So now I'm comparing alternative concepts to compare costs. I don't want to sprinkle the racks because I can't tie down where they will be or how many there are. My main concern with the wet pipe overhead concept is the challenge of working in about 5 feet of clear space over the coolers along with distributing the pipe after lifting it up through a few openings....very labor intensive.

I thought about the SIPA because it has fewer restrictions on ara/gallonage...allowing up to 1000 heads. The 30% requirement for area increase on PA systems may kill that idea. Straight up Dry Pipe with the gallonage limitations and maintenance issues may prove to be logistically impractical.

The panels are 6" thick but may not be substantial enough to hold the weight of pipe and water.

At this point...I'm not seeing enough reason to change from my initial concept of wet pipe overhead with dry pendent heads.

Atlantic Realty and Building, LLC
> Palm Beach Gardens, Fl
> 561-707-5150
> John W. Farabee
> V.P. Fire Sprinkler Division

On Sunday, September 18, 2016 3:02 PM, Bruce Verhei <> wrote:

What is the structure of the freezer? Are the racks integral to that structure, or free standing? Could you support system from racks?


Bruce Verhei

Go 'Hawks

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On Sep 18, 2016, at 10:13, rongreenman . < <>> wrote:

For once we have s post where a double interlock pre action is actually the proper system and our fellow forumite wants to use a single interlock. If you use a SIPA you'll have ice in your pipes before a head fuses. A DIPA WONT FLIW Wter into the piping until sprinklers are fused.

On Sunday, September 18, 2016, 321 < <>> wrote:e

    I have a very large Freezer/Cooler project that I am managing. My
    initial idea on this job has been to use a Wet Pipe System above
    the Freezer with ESFR Dry Pendents (Class IV in rack to 20'). Due
    to the exorbitant cost of the ESFR Dry Pendents I'm letting my
    thinking expand to possibly running Single Interlock Pre Action
    inside the Freezer ...since the Freezers are already up (yeah...I
    know !!).

    The ceiling panels are 6" thick and I was wondering if any of you
    guys in your history have ever hung Fire Sprinkler Pipe inside a
    Freezer attaching to/thru the panels and how?

    Thanks in advance

    Atlantic Realty and Building, LLC
    Palm Beach Gardens, Fl
    John W. Farabee
    V.P. Fire Sprinkler Division

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