FireNet Community

FIRE SERVICE AND GENERAL FIRE SAFETY TOPICS => Fire Safety => Topic started by: dusty on May 17, 2005, 11:19:01 AM

Title: Sprinkler reaction times
Post by: dusty on May 17, 2005, 11:19:01 AM

Gents,

I am installing a sprinkler system in the basement of a london premise, the area contains conveyers and is not heated, and will be seldom visited by personel, there is no heating and a dry system is proposed, the one charged with compressed air, dispite looking in BS 5306 part 2 and BS EN 12845, I can find no indiction of the reaction time for the system, is 2.5 minutes to long to clear the air from the system and produce water from the most remote sprinkler head ? guidance from all welcome.

Title: Sprinkler reaction times
Post by: wee brian on May 17, 2005, 12:46:24 PM

Dusty

I'm not aware of a min time to purge the air from a dry system but 2.5 minutes sounds a bit long to me.

Title: Sprinkler reaction times
Post by: Mark Newton on May 17, 2005, 04:46:28 PM

EN 12845:2003, para 11.2.2. puts limits on net volume of pipework downstream of control valve, unless a calculation and test shows max time between opening and water discharge is less than 60 secs.
Sorry, can't transcribe the table!
Bit more reasonable than 2.5 mins, I think.

Suggest you check with the building insurer, they will have something to say, probably helpful.

Title: Sprinkler reaction times
Post by: dusty on May 19, 2005, 12:41:55 PM

mnewton,

mnay thanks for this reference, I have a nagging disquiet over this sytem and its speed of operation, I will challenge them with this information, many thanks