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TravisMack: I have heard someone mentioned that map of isothermal lines in NFPA before. If I look at the isothermal lines (Lowest One-Day Mean Temperatures), then almost all the cities in the US should be using dry-pipe or preaction systems as most cities in the US have Lowest One-Day Mean...

cdafd: I'm talking about a fire riser with all the bells and whistles. Looks like it's up to the AHJ. Thanks.

jgailla: I was going to add that I have heard of one project that our office designed and the FPE that the contractor hired put the fire riser in the stairwell and got approved by the State Fire Marshal. That is the only project that I know of that has it in the stairwell.... and that stairwell...

Anyone know if NFPA has any requirements on where fire riser is located? This would be for a non-residential building with either wet pipe or dry pipe fire sprinkler system. I have heard co-workers mentioning that you cannot located a fire riser in a stairwell. I'm not sure if this is true or...

I'm not talking about a building full of smoke that it would trip the smoke detectors. A wildfire could be miles away and the building is not in a danger area, but the outdoor air quality is bad. The point is to improve indoor air quality so that people with asthma, people who may experience...

Hi, I have a project where the building is located in a rural area. When there's a forest fire, some of the wood smoke particles get into the building through the outside air intake at the air handler. I'm not sure what air filter is being used at the air handler. Has anyone dealt with this...

Anyone know what type of pipe material to use to transfer grease, motor oil, antifreeze, and transmission fluid within an auto repair shop? Thanks.

The buildings I have are: dormitory, multi-family dwelling, office building, and fire station where the fire trucks are parked with a small office and restroom.

You guys are correct.... 8.4.7 Large Drop Sprinklers 8.4.7.1 Large drop sprinklers shall be permitted to be used in wet, dry, or preaction systems. 8.4.7.2* Galvanized Pipe. 8.4.7.2.1 Where steel pipe is used in preaction and dry pipe systems, piping materials shall be limited to internally...

Thanks all for the responses. Lots of great information there. I forgot to mention that we are using 2002 NFPA 13 for this one. 2002 NFPA 13, paragraph 8.4.7.2.1 states "Where steel pipe is used in preaction and dry pipe systems, piping materials shall be limited to internally galvanized...

If I'm looking to convert an existing wet-pipe system to a dry-pipe system, I figured I need to do the following: 1) Recalculate to ensure the system has enough flow and pressure. 2) Replace fire riser with one used for a dry-pipe system. 3) Add riser mount air compressor. I'm not sure if...

So insulation on the upright piping and/or heat trace is not allowed?

Hi, I have a small commercial building (~4000 sf) with wood framed construction, a sloped roof, and attic insulation is at the ceiling. A wet pipe sprinkler system is being installed for the building with some upright sprinkler heads in the attic. Depending on the locations of these upright...