Mixing pipe.....

[PRinspector]

I just came from a Building , in that building the contractor used a mix of galvanized and black pipe for an area. The system is a wet pipe system ordinary hazard(group 2). I have never seen the mix of regular black and galvanize pipe is this prohibit by the code. I was not able to find it in NFPA 13.

Regards
Lou

 

[cdafd]

http://www.eng-tips.com/viewthread.cfm?qid=35783

It is allowed

Where is it located outside? Dry system ?? Bad atmosphere?
Freezer?[pre][/pre]

 

[cdafd]

Is this on a military base????

 

[TravisMack]

Yeah..as long as the pipe is listed for fire protection use, then no problem.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[PRinspector]

Is not an outside area, is an inside vehicle maintenance area with a wet system.

It is a military base. I know the newest UFC do not allow galvanize pipe at all. but this building was contracted few years ago.

 

[Sdpaddler50]

From a practical sense, why would you be concerned about galv pipe in a wet system?

 

[PEDARRIN2]

I would think if the entire pipe system is galvanized, not much of a concern, but the whole reason galvanized pipe is used is to protect from corrosion. If you have mixed pipes, and the galvanized pipe is the more predominant, then you will have water exposed to both zinc and the steel, which would quickly become a galvanic corrosion issue. If the galvanized pipe is the less predominant, then maybe it would be ok. The same rationale holds for installing small sections of copper pipe on steel sprinkler pipe, but never the other way.

 

[PRinspector]

SDpaddler50.

At this point I'm not really concern, the building was accepted like that by someone else. I have never seen that done anywhere else, that ‘s what pick my curiosity. I was thinking in the same line of what peddarin said. Is this a common practice?