I have not read the other replies so if I am repeating then apologies.
Zinc is sacrificial to steel where the corrosion process is
electrolytic.
There should be no concerns with unprotected steel in contact with zinc
coated steel and where water is present, other than the unprotected
steel will
And so Response time difference is only one factor to consider. Many would
draw the conclusion 'OMG 100 seconds difference but what about the children'.
Just because the first sprinkler operates later has NO direct singular
correlation to the outcome. This is WHY we use higher
What about just using a tri-seal grv cplg like the Victaulic 009? The
two pipe ends would never touch because of the rubber gasket in the
middle. Would this stop or slow down the corrosion process?
-Original Message-
From: sprinklerforum-boun...@firesprinkler.org
My name wasn't listed so I am not sure I am able to respond (actually I was out
of office on Fri).
In the 2002 edition, 8.3.2.1 states ordinary temp sprinklers are to be used
throughout, UNLESS 8.3.2.2, 8.3.2.3, 8.3.2.4 OR 8.3.2.5 are met. So you are
both right, 8.3.2.2 (the use of Table
Yes, keep the overall picture in mind. RTI is only one aspect. As others have
said, as more sprinklers operate, the discharge density decreases. Why activate
additional sprinklers and decrease the density if it is not necessary?
One more piece of info for high heat release rate fires and the
Thanks Duane. You've pointed out the essence of code reading and
interpretation. BTW you were included in the All at the end of the specific
list. Thanks again...to All
Mark at Aero
- Original Message -
From: Johnson, Duane (NIH/OD/ORS) [C] [mailto:johnson...@mail.nih.gov]
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Chris, I see your point about OMG...! I was not trying to do anything
elaborate, and the conclusions for the post had been arrived at-- still I
wondered about worst case activation time difference (only). I suppose I
should have kept it to myself. I found the HRR that would be just enough to
Formites and fire protection friends,
Has anyone here ever installed an electric fire pump on these spring type
isolators? We usually install them on a pad, but recently had someone
require us to install on the isolators. Any help would be appreciated.
C.Gregg Key, SET
Key Fire Protection
. -Francis Bacon,
essayist, philosopher, and statesman (1561-1626)
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Of course, I was only speaking of adopted codes. I'm not familiar with
all of the various code sets available for a jurisdiction to consider;
however, the prevalent code set in Texas is IFC. IFC references NFPA 13 and
13R specifically for its installation requirements. What I was ultimately
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Recently I do my first fire pump test using playpipes and pitot tube. I do
the following and I not sure if I do it right.
I do not know if I do it right. I do the following steps:
1. The manifold has six 2.5 connections, on each one I use a play pipe.
2. I open all the OSY of 8 for the manifold.
In the recent 'Temperature Rating...' post I said:
286 SR, activation time = 188 seconds
286 QR, activation time = 172 seconds
212 SR, activation time = 97 seconds
212 QR, activation time = 80 seconds
This was with a fire directly under the head, with a fire that grew
from 0 to ~1000
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