But I only remember the sixty seconds applying to a system of 500-750 gallon capacity one NOT equipped with a QOD. Seems that you put had no option over 750--QOD! And then it was just OK. If I'm not mistaken what continual disasters attributable to slow transit time drove the change?
On Thu, Jun 18, 2009 at 7:25 AM, Roland Huggins<[email protected]> wrote: > 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) > -- Ron Greenman at home.... _______________________________________________ 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)
