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I have a project where 1" and 3/4" conduit is penetrating a 2 hour fire wall. the annular space around the conduit is sealed with FS-ONE MAX. On one side of the fire wall, the electrical system is closed. on the other side, the conduit is open at 12" and cabling and wire will go to a cable tray...

I think the answer to this question has a wide array of correct answers. If you are doing an FM Global job for instance they are going to require 10 psi buffer or 10 % below available pressure. This is a good rule of thumb to follow to allow for unforeseen changes/demand that a public water...

I agree! The price is ridiculous..even more ridiculous is how little the price break is for buying in bulk. That's a good idea to send them with the close out documents. I just might start doing that. tony

I've never heard of anyone stealing an NFPA 25. I have never heard of anyone playing in spare head boxes and damaging or losing them. I can go to job sites from 10 years ago and its still there..wipe off the dust and its in pristine condition. If you have a company policy why does anyone have to...

We supply one to every job that is 13 and 13R. If it's 13D, we do not (doesn't really apply). We compensate for the cost by including it in the bid. Usually if you miss out on a bid, it's not the $45.00 manual that made you lose out on it. As far as who really cares about it..pretty much no one...

I think the idea is too hook it up to something that gets used on a daily basis throughout the year (toilet,sink). The use of such fixtures acts as its own pressure relief valve if you will, introducing original system pressure every time they are used. If a hose bib is used, during winter...

Found it. 5.2.1.2 and 5.2.1.3. Working pressure for stand alone not less than 175 PSI. tony

As a company we have installed CPVC (blazemaster) in houses, with a little bit of copper for aesthetics in exposed applications. However with an increase in the demand for freeze protection, general contractors have been on us about offering PEX piping. After quite a bit of research (not enough...

skdesigner, that should be perfect for what i'm dealing with, i guess your google works better than my google. lol. @cdafd, the ceiling is 8 foot high, it is a two piece escutcheon, only recessed but a 1/2". tony

Our company just completed a NFPA 13 Fire Sprinkler System in a church. It was actually a church addition. One of the areas is an activities room for a youth group. One of the concerns brought up was having one of the kids hitting a sprinkler head with a ball and setting off one of the heads (at...

ok. i think we are on the same page then. i hear ya barking big dog! thanks again tony

Well that's just it cdafd. Where does it say to use the three foot rule instead of the table? Usually when NFPA specifies to use something else when it applies, it explains what conditions need to be met to use the alternate method. In this case it does not specify. The only differnce in verbage...

In NFPA 13D 2007 edition, under 8.2.5.2.1 it states as follows: Pendent sprinklers shall be located at least 3 feet away from obstructions such as ceiling fans and light fixtures unless the requirements of 8.2.5.4 are met. 8.2.5.4 gives you the table to refer to at 8.2.5.4.2(position of...

thank you thats perfect! tony

One of the engineers in our office just loaded up AutoCAD 2009 version, he had been using AutoCAD 2001 version. I don't know if anyone is familiar with 09' version yet but he doesn't like the view or style they changed it to; my question is, is there a setting that will change it back to the...

I use that one in the nfpa 13d and 13r applications but this is nfpa 13 light hazard. i don't know that this head can be used in that application. I'll check with ahj. Thank you for the post cdafd. tony

Our company is providing fire protection to a fly fishing lodge via fire sprinkler system. Its light hazard. CPVC. Wet. Because of the layout and some goofy interior designs we were hoping to find a horizontal side wall head that shoots perpendicular to a sloped (pitched) ceiling. The pitch is...

Stookey Our company is definitely not supportive of this but we are at the mercy of the ahj. thank you all for your input tony

Thank you t-mak for the reply! Thats where i'm coming from too. The AHJ is a little goofy tho! They are requiring us to provide dry horizontal sidewalls to cover any area [b]outside[b/] where there is a bbq or fire pit. They are leaning heavily on the side of saving structure regardless of our...

Hi all! I got a question for ya! I am designing a nfpa 13d fire sprinkler system in a 10,000 sq. ft. vacation home in our area (central washington). Needdless to say the guys got loads of money. I noticed during my survey he has 300 sq. ft safe/room. The walls and ceilings are 10" thick...