Anyone know of 10in non-sch40 pipe that has a CRR of 1? Have a project
where the EOR is insisting on this. They also have a 100lb maximum point
load per hanger…..but that is a conversation for another day!
Thanks,
Dewayne Martinez
Fire Protection Design Manager
*TOTAL** Mechanical*
*Buil
It has always been my understanding that the corrosion resistance ratio
benchmark of (1) is based on threaded schedule 40 steel, so I believe any other
pipe type would have a better or worse ratio, but not the same.
Mike Stossel SET
[400dpiLogoCropped]
36 Barren Road
East Stroudsburg, PA 18302
O
Isn't the CRR based on the actual remaining wall thickness at the root of the
first exposed thread outside of a fitting? So if you're not threading it, it
should theoretically have a CRR greater than 1.0. Also, I believe the term
Standard wall pipe in 10" diameter refers to schedule 30.
Mark at
I thought that as a manufacturing standard all steel pipe regardless of
schedule had to have a CRR of 1 or greater.
Richard Carr, SET
Branch Manager
Cox Fire Protection, Inc
6555 Grace Lane.
Jacksonville, Fl. 32205
rc...@coxfire.com
904-781-8227
From: Sprinklerforum [mailto:sprinklerforum-boun..
I thought I was clear on this definition but I have an FPE and a technical
representative from a fire sprinkler manufacturer stating they are not
concerned with the opening of cross section area in regards to the 70 %
stipulation in the definitions. They have stated they are only concerned
about t
Anything special needed for monitoring power to heat trace?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (ofc)
860-553-3553 (fax)
860-608-4559 (cell)
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You are both right (but you are molter right). BOTH conditions determine the
classification. The 70% is in the definition (3.7.2) and the depth the solid
portion of the structure; member protrudes down from the ceiling is in the
annex.
Roland Huggins, PE - Senior VP Engineering
American Fi
We can only find cut sheets for 10” sch 40 that show a CRR of 1.0
We have reached out to our suppliers and they have nothing either and the
EOR wants a cut sheet….
*From:* Sprinklerforum [mailto:
sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Richard Carr
*Sent:* Friday, August
The CRR (corrosion resistance ratio) is solely based on wall thickness:
CRR = (X / Y)^3
Where:
X is the thickness of the pipe in question at the first exposed thread OR
THINNEST WALL SECTION FOR UNTHREADED PIPE.
And
Y is the thickness of schedule 40 pipe under the first exposed thread.
So if
I had a AHJ question recently why we didn’t have hangers on our branch
lines coming off the backside of the main. They are 2 ½” supplying one
sprinkler and are 36” long. I was taught to use the lengths specified in
9.2.3.4.1 (unsupported lengths) and consider my main pipe as the “hanger”
required
With that size I'm guessing you have a pump
Then unsupported can't be more than 12".
Sent from my Verizon 4G LTE Droid
On Aug 11, 2017 12:13 PM, Dewayne Martinez
wrote:
I had a AHJ question recently why we didn’t have hangers on our branch lines
coming off the backside of the main. They are 2 ½
Well, if they are only supplying one head, then “technically” they are an
armover, right? Are they attached directly to the main, or on a tee at the top
of a riser nipple?
-Kyle M
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of Dewayne Martinez
Sent: F
Not true. The "over 100 psi" issue is only a factor when you have pipe above
the ceiling feeding sprinklers below a ceiling. If it is an exposed condition
with uprights or pendents on the line, then the presence of a pump is not
relevant.
-Original Message-
From: Sprinklerforum [mailto:
It’s comes off the tee on a RN. The sprinkler is a upright.
*From:* Sprinklerforum [mailto:
sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *
Kyle.Montgomery
*Sent:* Friday, August 11, 2017 11:17 AM
*To:* sprinklerforum@lists.firesprinkler.org
*Subject:* RE: [EXTERNAL] Outrigger B
Hello Fpdcdesign,
The one time I did heat trace, the controller had trouble contacts for remote
monitoring.
Friday, August 11, 2017, 10:07:21 AM, you wrote:
Anything special needed for monitoring power to heat trace?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-53
What I’ve always tried to do in that situation was put the main on the “in”
side of the truss or beam it was hanging from, pass the tail-backs under the
same member and catch a hanger on the “out” side. If the pipe to the last
sprinkler had to be longer, just increase the pipe size.
Steve L
F
Makes perfect sense Steve, thanks.
*From:* Sprinklerforum [mailto:
sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Steve Leyton
*Sent:* Friday, August 11, 2017 11:33 AM
*To:* sprinklerforum@lists.firesprinkler.org
*Subject:* RE: Outrigger BL off mains - NFPA 13 (07ed)
What I’ve
Thank you. Further clarification...the manufacturer is stating in
conjunction with an FPE that since its a special listed head, the 70
percent open cross section is irrelevant ( and therefore ignored) since
it's listing allows it to throw within a six inch open space. I have never
heard this befo
Then I think you should be able to use the section you are referring to and
have a maximum unsupported length of 60”.
Is it a welded branch line? That make it a little bit easier sell than if it’s
threaded with individual segments.
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.fires
I have always considered those to be armovers. Technically, 13 says armovers
are off of branch lines, but it seems a stretch to me not to include a short
branch line off of the main with a single sprinkler not to be an armover.
Bob Knight, CET III
208-318-3057
From: Sprinklerforum [mail
Can someone provide me with insight regarding the applicable obstruction
rules for ventilation ducts made of fabric? It seems that the issues are
not the same
as metal ducts but I cannot find any reference in NFPA 13 that addresses
these ducts as being different.
Thanks,
David Bitton, in
To further muddy the waters, the Annex shows examples of armovers and uses the
wording “branch line or cross main”.
Thank you,
Bob Knight, CET III
208-318-3057
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of Bob
Sent: Friday, August 11, 2017
Our experience with fabric - retraceable ducts is that the same obstruction
rules apply as hard duct, especially when dealing with ESFR sprinklers
[ccfs_LOGO (2)]
Byron Weisz
Cen-Cal Fire Systems, Inc.
P.O. Box 1284
Lodi, CA 95241
Phone (209) 334-9119
Fax (209) 334-2923
by...@cen-calf
When using Sammy screws (or similar product) is it the intent of NFPA 13 to
have the sammy screw follow the same guidelines as a CSR?
Thank you,
Bob Knight, CET III
208-318-3057
FBK-LOGO-SMALL
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I do not believe so. I would follow the LISTED products installation
literature which should replace the requirements of NFPA 13.
John August Denhardt, P.E.
Strickland Fire Protection Incorporated
4011 Penn Belt Place
Forestville, Maryland 20747-4737
301.474.1136 - Office
301.343.1457 - Mobile
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