My prior message should have said is NOW 15 sec not "not" on residential dwellings.
Determining the volume and trip time for the dry pipe valve is easy. Measuring the transition of the water while incorporating the impact of the compressible fluid (air left in system) is beyond the mathematics done on a napkin for the volume and trip time. When's the last time any of us has even done a differential equation and that's ignoring the fact that no one had figured out what equations to use? What drove the development was the choice would you as a contractor prefer to know beforehand whether a system greater than 750 gal is acceptable? I'd say it beats praying at the inspectors test connection with a stop watch while wearing diapers cause you know what will happen if you exceed 60 seconds. WIth that in mind, it wasn't difficult to sell to the committee. Roland On Jun 17, 2009, at 4:19 PM, Ron Greenman wrote: > As I read this it seems to say that the same rules apply as before but > to prove the system size I have to use an approved computer program. > Now I'm no math whiz but I can calculate the capacity of a bunch of > tubes (pie is square times length equals cubic X, convert X cubes to > cubic feet, convert the smelly feet to gallons, add up all the > different sized tubes and....). Time consuming but why do I need a > multi-thousand dollar program for a task that I can do with paper and > pencil? _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
