Be very carefully with these, we have done quite a few and it is surprising the friction loss of the incoming line especially with high pressures. Unless this is a new install with a 1 inch line you may find the calcs difficult. We have also found many issues with the incoming soft copper service being deformed or plugged, very little care is taken when these are installed.
Regards, Jamey On 2012-04-11, at 1:12 PM, Ron Greenman <[email protected]> wrote: > Someone needs to explain to me why I need a flow test on anything that > merely flows 30 or so gpm unless my pressure demand is near my city static. > > On Wed, Apr 11, 2012 at 9:57 AM, IPA <[email protected]> wrote: > >> By default you need to calc according to 13 (which requires a full flow >> test). The only exception is if you use the simplified calculation method >> described by 13D which is essentially calculating to only a static pressure >> and also requires you to figure in losses through tees on the run and is >> only good for straight run systems (ie. tree), and mains larger than 4" (if >> I recall correctly). >> >> >> >> On Wed, Apr 11, 2012 at 9:29 AM, Gary Stites <[email protected]> wrote: >> >>> If I remember right, if a 13D system is looped or gridded then, >>> technically, it is to be calculated against a curve rather than static >>> pressure, thus requiring a flow test. >>> >>> On Wed, Apr 11, 2012 at 9:20 AM, Owen Evans <[email protected]> wrote: >>> >>>> I am curious to know how many of you have had an AHJ require a full >> blown >>>> flow test be submitted with 13D calculations? 13D only requires a >> static >>>> pressure reading from the job site address. Reason being, it is >>> understood >>>> that a 13D system demand (two heads flowing, 26gpm) will not over-run a >>>> municipal water system. The flow test is only required for buildings >> that >>>> fall under the NFPA 13 standard. The cost of a flow test can be very >>>> expensive and time consuming. Contractors must wait for the water >>> purveyor >>>> to conduct the test. >>>> >>>> >>>> If an AHJ requires a flow test for a 13D system, and since 13D does not >>>> require a flow test, doesn't the AHJ have to get approval from the >> State > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
