Thanks to all of you. In fact, I was sure there was a part of the code that says that the silencing valve on the alarm line on a wet system shall be after the alarm pressure switch, in such a way that you can't silence the pressure switch... May be it's in some part of the CNPI (canadian...
First, I want to apologies for my English, it's obviously not my first language.
Here's my problem... I think I saw something about that in NFPA 13, but I search and I didn't find...
If I'm correct, the control valve (controling for exemple the water motor gong) should be after the pressure...
I don't know if the client Will like this, but here's a part of the code:
NFPA 25 2011 - art. 13.4.4.2.9 Dry pipe systems shall be tested once every 3 years for air leakage, using one of the following test methods:
(1) A pressure test at 40 psi (3.2 bar) shall be performed for 2 hours...
The codes don't statuate about any minimum thickness...
"thickness of 0.003 in. (0.076 mm) or less", so as long as I understand well the codes, 0.0012 in is less then 0.003 in...
(A "mil" is a thousandth of an inch, so it's not really metric stuff... Ok half half! :P )...
Cdafd,
There's a problem with normal sandwich bag, as explained in the annexes of the NFPA. Paper bag is expensive... The link that I gave in the last post, is much cheaper and meet the specifications asked in the codes... 1.2 mils, equal 0,0012 in, so the thickness is less then the 0,003...
Check out this: http://www.cellobags.com/Fold_Over_Flat_Cello_Bags_s/145.htm
PFB355 should do the trick!
Or you could use thin paper bags... As permitted in the NFPA 25 & 13!
NFPA 25 2011
art.5.4.1.7.1*
Sprinklers subject to overspray accumulations shall be protected using cellophane bags...
An NFPA 25 inspection is one thing, but a sprinkler system still have to be in accordance with NFPA 13.
In exemple if a duct is newly installed, and the sprinkler system isn't correct in accordance with NFPA 13 2010 - 8.5.5.3.1, (Obstruction that prevent sprinker discharge from reaching the...
My concern is, will the water filled with chlorine or salt cause any permenant damage to the pipes, on a long time basis? And, maybe a backflow preventer would be a good idea.
My two cents... ;)
