[Sprinklerforum] Re: [External]Re: Dry Sprinkler K-Factor

Ken Wagoner Thu, 27 Mar 2025 13:26:48 -0700

Interesting Kyle.

I note that the 'out of the box' k-factor wasn't identified in the table you've provided. I'm guessing that the value is about 11.2 as that is the lowest value shown in this table.

I also note that what Travis was talking about was a dry-pendent ESFR, and none of the data sheets for those seem to have a similar table to the one you've copied for us.

sincerely,

Ken Wagoner, SET
Parsley Consulting
3002 Younger Drive
Harrisonville, Missouri 64701-2235
Phone: (760) 745-6181
Visit the website
Please note new street address

On 3/27/2025 2:43 PM, Kyle.Montgomery wrote:

28.2.4.10.3 states “flow from a sprinkler shall be calculated using the nominal K-factor except that the manufacturer’s adjusted K-factors shall be utilized for dry-type sprinklers.”

You are supposed to use what is on the data sheet for that particular sprinkler and length. For example, here is one from a Tyco data sheet:

Let me know if this comes through.

Kyle Montgomery

Pre-Construction Manager

Aero Automatic Sprinkler Co.

21605 N. Central Ave.

Phoenix, AZ 85024

Direct: 623.580.7820

Cell: 602.763.4736

[email protected]

From: Mike Stewart <[email protected]>
Sent: Wednesday, March 26, 2025 12:47 PM
To: [email protected]
Cc: [email protected]
Subject: [External][Sprinklerforum] Re: Dry Sprinkler K-Factor

Since the connection point has a large opening and the “K Factor” has to do with the smaller opening size of the fire sprinkler itself then the “K Factor” should be added at the fire sprinkler head itself.

Mike Stewart

(843) 490-8366

On Mar 26, 2025, at 12:44 PM, Fpdcdesign <[email protected]> wrote:

The K factor has to do with discharge, so it should be applied at the sprinkler, unless noted otherwise by the manufacturer. If they are to be taken at the POC, then the K factor would be modified per length of sprinkler in the literature. Kind of like how Autosprink does it.

Todd Williams

Fire Protection Design/Consulting

Stonington, CT

860-608-4559

On Mar 26, 2025 at 12:20 PM, <Travis Mack> wrote:

Is the k-factor for a dry sprinkler to be applied at the sprinkler, or at the point of connection to the piping network? I understand things like the Victaulic Dry Flex sprinkler have the k-factor at the POC. What about all other dry sprinklers? POC or sprinkler orifice?

Travis Mack, SET

M.E.P.CAD | Instructor / Support

181 N. Arroyo Grande Blvd. #105 I Henderson, NV 89074

www.mepcad.com | 303-923-8215

Email: [email protected]

AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD

Academy of Fire Sprinkler Technology | Director, Engineering Technology

101 S Main Street, Suite 001, Decatur, IL 62523

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[Sprinklerforum] Re: [External]Re: Dry Sprinkler K-Factor

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