I've never known anyone using a program like hydracad that requires an
input to spend the time to figure out the density that would be relevant
for the calc sheets. Any time you make a design change you'd have to
potentially change every one of them. And even then, the density is only
a hypothetical, because only the end head will deliver the density you've
calculated. Using the word density with ESFR/CMSA period is an exercise
in futility IMHO. Just because a number can be defined doesn't make it
relevant to the system.
Mike Morey
CFPS 3229 ⢠NICET S.E.T. 123677
Project Manager ⢠Fire Protection Group
Shambaugh & Son, LP an EMCOR Company
7614 Opportunity Drive ⢠Fort Wayne, IN ⢠46825
direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991
email ***@shambaugh.com
From: "Jay White" <***@dynamicfirepro.com>
To: <***@lists.firesprinkler.org>
Date: 03/14/2017 03:30 PM
Subject: RE: ESFR Sprinkler Density
Sent by: "Sprinklerforum"
<sprinklerforum-***@lists.firesprinkler.org>
I understand that it is not an area density calculation. But a density can
be calculated based on the k-factor, pressure and area of sprinkler. Based
on a pressure of 40 psi, a k-factor of 22.4, and an area per sprinkler of
90 sq. ft.. I came up with a density of 1.57. Why not use 1.57 in the
calculations instead of .10? Like I said I may be way overthinking it.
Just thought I would throw it out there, and I do appreciate the
responses. And our calc program requires to input a density to run.
Jay White
Design Manager
Dynamic Fire Protection
9771 Highway 25 South
Starkville, MS 39759
PH: 662-312-2426
FAX: 662-324-1545
From: Sprinklerforum [
mailto:sprinklerforum-***@lists.firesprinkler.org] On Behalf Of Mike B
Morey
Sent: Tuesday, March 14, 2017 2:20 PM
To: ***@lists.firesprinkler.org
Subject: Re: ESFR Sprinkler Density
ESFR sprinklers are specific application sprinklers, they don't use the
area density method. Most calc programs require a density be input to
run, so that's probably why you're seeing it. As long as they calculated
the right number of sprinklers at the right minimum operating pressure it
should be fine.
The views, opinions and judgements expressed in this message are solely
those of the author. The message contents have not been revewed or
approved by S&S
Mike Morey
CFPS 3229 ⢠NICET S.E.T. 123677
Project Manager ⢠Fire Protection Group
Shambaugh & Son, LP an EMCOR Company
7614 Opportunity Drive ⢠Fort Wayne, IN ⢠46825
direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991
email ***@shambaugh.com
From: "Jay White" <***@dynamicfirepro.com>
To: <***@lists.firesprinkler.org>
Date: 03/14/2017 03:15 PM
Subject: ESFR Sprinkler Density
Sent by: "Sprinklerforum"
<sprinklerforum-***@lists.firesprinkler.org>
For ESFR calculation purposes. What part does density play in a
calculation program. Density is based on square root of pressure times
k-factor divided by area per sprinkler. Is this the density required to
input in calc programs. Our company hired an outside designer for an ESFR
project and they used .10 density in his ESFR calculations. I came up with
a 1.57 density. What am I missing or am I completely off.
Jay White
Design Manager
Dynamic Fire Protection
9771 Highway 25 South
Starkville, MS 39759
PH: 662-312-2426
FAX: 662-324-1545
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