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Wet-pipe or Dry-pipe system?

Wet-pipe or Dry-pipe system?

Wet-pipe or Dry-pipe system?

(OP)
1) What is the proper way to determine whether a dry-pipe or wet-pipe system should be used?  I have looked at design winter dry bulb temperatures, and it seems that most cities in California have a winter dry bulb temperature at or below 32°F and record low temperatures even lower.

Winter design temperature for one of my projects is 30°F with record low at 20°F.  A dry-pipe sprinkler system is specified, but our State Fire Marshal stated they will not approve a dry-pipe system for this location.  Is there a calculation that needs to be done that will tell me if a wet-pipe system is adequate?
 
2) Does NFPA require all portions of the piping containing water in a fire sprinkler system (wet or dry) be maintained above 40°F?  If so, can pipe insulation be used to accomplish this?

Thanks.

RE: Wet-pipe or Dry-pipe system?

Did they say why a dry pipe would not be allowed??? High piled stock application ???

If the design meets 13 seems like it is up to you/ owner which type of system they want to put in

Would say if the pipe cannot be maintained to 40 F, than an alternative has to be done  

RE: Wet-pipe or Dry-pipe system?

(OP)
I'm not sure if SFM gave a reason.  Our fire protection engineer passed the message to us and didn't give a reason.  Our FPE also agreed with the SFM.  I asked our FPE for a reason and asked the same questions I asked here, but have not gotten a response from the FPE.

RE: Wet-pipe or Dry-pipe system?

Is this a warehouse??

Is it some type of building that either is not Normaly heated or would take a lot to maintain a set temp??

Your paying the FPE so he should answer why a dry system is speced  

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