I agree as well. Some of these flex hose assemblies can have 50+' of
equivalent length. I would want it calculated to make sure it still works.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:tm...@mfpdesign.com
http://www.mfpdesign.com
https://www.facebook.com/pages/MFP-Design-LLC/92218417692
Send large files to us via: https://www.hightail.com/u/MFPDesign
LinkedIn: https://www.linkedin.com/in/travismack
On 8/30/2016 7:39 AM, Steve Leyton wrote:
To underscore John’s point, these fittings impose with a SUBSTANTIAL
pressure loss. As 3^rd party, we would ask for calculations to prove
the performance of the revised configuration.
SL
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of
*Michael Hill
*Sent:* Tuesday, August 30, 2016 6:11 AM
*To:* sprinklerforum@lists.firesprinkler.org
*Subject:* RE: Flexheads in small renovation
I agree with Richard, it needs to be evaluated. It is known that flex
piping is generally more demanding than their hard piped counterparts.
If the base building design did not include flex piping, I would look
at it as a change to base building design and perform a quick
calculation to see how it looks. I assume they didn’t use excessively
long flex pipe with more bends or lops than were needed.
Mike Hill
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of
*Todd Williams
*Sent:* Tuesday, August 30, 2016 8:39 AM
*To:* sprinklerforum@lists.firesprinkler.org
<mailto:sprinklerforum@lists.firesprinkler.org>
*Subject:* RE: Flexheads in small renovation
This is a single story building. Multiple looped 4" and 3" cross mains
with branches to wings. (Think nursing home with interior court
yards). No fire pump. 100 psi static with a flat curve (2 year old
test, DeltaE = 0). Area in question not most hydraulically remote but
toward that end of the building. Branch lines are fed from the loop,
not a DE branch main. LH occupancy.
I am not worried about this not being adequate, more a consensus of
what needs to be done and what is correct.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (ofc)
860-608-4559 (cell)
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On Tue, Aug 30, 2016 at 8:22 AM, Richard Carr <rc...@coxfire.com
<mailto:rc...@coxfire.com>> wrote:
I can’t disagree with John (Hi John) but we need more info to make
the call,
In remote area?
Fire pump?
What is safety margin on existing?
What is friction loss on the flex?
Just because you add 4 flex piping to an existing system does not
require it to be calculated. But does need to be evaluated.
Richard Carr, SET
Branch Manager
Cox Fire Protection, Inc
6555 Grace Lane.
Jacksonville, Fl. 32205
rc...@coxfire.com <mailto:rc...@coxfire.com>
904-781-8227
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf
Of *John Irwin
*Sent:* Tuesday, August 30, 2016 7:14 AM
*To:* sprinklerforum@lists.firesprinkler.org
<mailto:sprinklerforum@lists.firesprinkler.org>
*Subject:* RE: Flexheads in small renovation
I disagree with Richard. (Hi Richard!)
Relocating these sprinklers with flex heads may very well change
the location of the most hydraulically remote area to the place
you are working. Flex-heads come with a substantial pressure loss.
Even if doing calculations wasn’t required, I would want to do
them for myself for peace of mind. My belief has always been that
you can’t tax the system without verifying that it still works.
*John Irwin*
Manger – Fire Sprinkler Division
*Critical System Solutions, LLC
*Cell: 813.618.2781
Email: jir...@criticalsystemsolutions.com
<mailto:jir...@criticalsystemsolutions.com>
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf
Of *Richard Carr
*Sent:* Tuesday, August 30, 2016 7:08 AM
*To:* sprinklerforum@lists.firesprinkler.org
<mailto:sprinklerforum@lists.firesprinkler.org>
*Subject:* RE: Flexheads in small renovation
Are the relocates in the remote area? if not I would not calc.
also , some flex brands are better that others as far as friction
loss.
Richard Carr, SET
Branch Manager
Cox Fire Protection, Inc
6555 Grace Lane.
Jacksonville, Fl. 32205
rc...@coxfire.com <mailto:rc...@coxfire.com>
904-781-8227
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf
Of *Todd Williams
*Sent:* Tuesday, August 30, 2016 6:30 AM
*To:* sprinklerforum@lists.firesprinkler.org
<mailto:sprinklerforum@lists.firesprinkler.org>
*Subject:* Flexheads in small renovation
I have a client that did a 4 sprinkler relocate job in an office
and used Flexheads (no sprinklers added). If the sprinklers were
connected with hard pipe, I would probably not do hydraulic
calculations. Given that we have FHs, should I be doing a full 900
or 1500 sqft calculation?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (ofc)
860-608-4559 (cell)
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