His question (and my answer) were regarding FM Datasheet 3-26.  

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 [email protected]







From:   Ron Greenman <[email protected]>
To:     [email protected]
Date:   12/03/2018 12:02 PM
Subject:        Re: Interior Loading Docks
Sent by:        "Sprinklerforum" 
<[email protected]>



BE ADVISED - This email originated outside EMCOR. 

Why edition are yo looking at. Chapter 2 is referenced publications in all 
recent editions and chapter 21.1 (I was speculating on a typo) ends the .1 
section at 21.1.9 in the 2016 edition. I'm at home and all my earlier 
editions are at the office. 

This is what the 2016 edition has to say about EC sprinklers in chapter 
21:
Chapter 21 Alternative Sprinkler System Designs for
Chapters 12 Through 20

21.5.3 Extended Coverage Spacing Sprinklers.
21.5.3.1Sprinklers having extended coverage areas requir-
ing up to 10 sprinklers to be included in the hydraulic calcu-
lation shall be installed in accordance with the obstruction
criteria described in 8.8.5.1, 8.12.5.2, and 8.12.5.3, unless
large-scale fire testing is conducted with a representative ob-
struction below the sprinkler that demonstrates equivalent
performance.
21.5.3.2CMDA and CMSA sprinklers having extended cover-
age areas requiring more than 10 sprinklers in the design area
shall be installed in accordance with the obstructions to sprin-
kler discharge criteria described in 8.11.5 and 8.8.5.1.

21.5.3.2.1ESFR sprinklers having extended coverage areas
requiring more than 10 sprinklers in the design area shall be
installed in accordance with the obstructions to sprinkler dis-
charge criteria described in 8.12.5.2 and 8.12.5.3.
21.5.3.2.2Other obstruction criteria shall be acceptable if
large-scale fire testing is conducted with a representative ob-
struction below the sprinkler that demonstrates equivalent
performance.
21.5.3.2.3When utilizing upright CMSA, CMDA, or ESFR
sprinklers, any continuous obstruction 4 in. (100 mm) or less
shall be permitted to be ignored.

Ron Greenman

[email protected]

253.576.9700

The Universe is monstrously indifferent to the presence of man. -Werner 
Herzog, screenwriter, film director, author, actor and opera 
director (1942-)


On Mon, Dec 3, 2018 at 5:28 AM Mike B Morey <[email protected]> wrote:
2.1.1.10.1 specifically states extended coverage heads are only allowed in 
wet pipe systems.



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 [email protected]







From:        JD Gamble <[email protected]> 
To:        "[email protected]" <
[email protected]> 
Date:        11/30/2018 04:31 PM 
Subject:        Interior Loading Docks 
Sent by:        "Sprinklerforum" <
[email protected]> 



BE ADVISED - This email originated outside EMCOR. 

I have a project with an interior truck loading bay in a light 
manufacturing facility.  Looking at using FM3-26 as the basis of design, 
which allocates the design density as .3/3500 for a dry system at HC-3. 

Am I reading right that I and limited to using standard coverage 
sprinklers only on a dry system? (Referencing Table 2) 



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