Safe door on a gun room. Fireproofing?

[Reloadron]

Maybe I'm dense (probably!) but I'm having trouble figuring out the purpose of a backflow valve on a fire sprinkler system....

Outlaw Man nailed it. Sprinkler systems result in dead heads. Water in those lines gets stagnant. When line pressure changes you don't want that water back flowing into your supply. That is also why I suggested a valve at the end of the line so the system can be easily flushed.

Ron

 

[idoono]

A better way to go may actually be to not have water in the lines at all. Investigate a pre-action nitrogen charged system similar to what is used in computer rooms.

As one can imagine computers & water are not friendly. Having a gas charged system ensures that when some electrician grabs and busts a pipe the computers dont get accidentally flooded.

If there is a real fire the system triggers the valve that lets the water in the lines and you are good to go.

Possible drawback is expense - I bet its $$$

I can tell you from experience that a dry pipe system is a major maintenance headache. The valves that let the water overcome the air pressure require testing and maintenance on a regular basis. Plus you must maintain the source of your air or nitrogen charge. The new sprinklet heads do not just go off anymore. They activate only when they are exposed to the rated temperature.

Idoono

 

[4v50 Gary]

Sportsman Steel uses the Pentagon name because of its bad reputation.

 

[kentucky_Dave]

Here is a good place to start ...http://database.ul.com/cgi-bin/ulweb/LISEXT/1FRAME/FireResistanceWizard.html