https://www.dropbox.com/s/1pnryhlf5f0fckn/tim_flow_test.xlsx?dl=0
Tentative Estimate: 150,?,430. .2/1950= 390 GPM min system demand so should be OK. I welcome any and all to take what they like and leave the rest, and if you have any questions mail me off Forum any time day or night here: [email protected] Tim, if this is the same AHJ as the tree deal you will be in luck. I used Roland's Sprinkler Age article as a way forward with the spreadsheet, and for checking and correcting my thinking and results over the year or so I scratched my head. In that article Roland estimates GPM based on calculating the size, length, fittings and valves of the main drain. He assumes a flow and C of D for the discharge and calcs back to the riser for a PSI required. It is for estimating GPM for the purpose of exercising backflows. I think your AHJ would see the value of it, and respect the author. 2013, June I think it was, maybe May. Brad _____ From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Tuesday, January 24, 2017 5:28 PM To: [email protected] Subject: Re: Hydrant Flow Test Man those trees were fun Tim! 150 Static at the riser gauge? Any Main Drain Test Tags? If you could give me the Residual from the tags, and the size, length, fittings and valves of the main drain I could estimate the GPM, and you would have it all-- a source node to calc to right there in front of you, all open and above ground, without flowing a single drop or turning a wrench. And nevermind all the "we can't trust Main Drain Tests as REAL flow tests, we don't know why not, we just can't, for our calculations". I figured out why not, and fixed it. Brad On Jan 24, 2017 3:54 PM, "Todd Williams" <[email protected]> wrote: This is a quick response and would have to think it out a little, but could you flow from the hose valves on the standpipes and read a static and residual at one of the back flow preventer test outlets? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT Office: 860-535-2080 <tel:(860)%20535-2080> Cell: 860-608-4559 Fax: 860-553-3553 <tel:(860)%20553-3553> On Tue, Jan 24, 2017 at 2:37 PM, Tim Stone <[email protected]> wrote: I am working on an existing project. 4 story wood frame hotel at a ski area. The building equipped with 3 standpipes and no less than 11 - 4" Dry pipe systems. The water supply is an underground water tank serving both fire and domestic. The tank is located up on the side of the mountain. Inside the building at the sprinkler riser there is 150 PSI Static. System was built in 1997 with no provisions for flow testing in the future. No Fire Hydrants off the underground entering the building. There are yard hydrants fed from separate water supply (Pond next to hotel building). The owners are using the Conference Rooms for Trade Shows where large amounts of combustible materials are being brought in from time to time. At Christmas time, they bring fresh cut Balsam Fir trees in, have them professionally decorated and then auction them off and shipped. Some may remember my earlier post about the Trees. I know Brad Casterline will. The State AHJ has asked the owner to change the Conference Room use from Light Hazard to Ordinary Hazard Group 2. I need a current flow test to be performed so to recalculate the affected areas in the building (3 Conference room spaces). Here is the problem. The simple solution is to shut the sprinkler system down, Drain Sprinkler system, (over 300' of 6" and various 4" runs too) turn FDC check valves 180 deg. (there are 2) or replace them with spool pieces of pipe, turn water on and measure water flow from free standing Fire Dept. Connection out in the front yard. At minimum 2-3 hours to drain through 2" drain valve based on isolation of all known control valves. This procedure would probably take most of the day and the owner would be required to have a fire watch in place for the day. The owner and Servicing sprinkler contractor have run this idea by me for possible solution. One of the conference rooms is fed by one of the 4" Dry Pipe valves and the system extends outside (4"grooved feed main) to supply coverage on outside porches and covered walk ways on the ground level . The contractor has suggested that the 4" grooved main be taken apart outside and used to perform the flow test while reading the pressure gauges back in the sprinkler valve riser room. This operation could be done in half a day without any disruption to sprinkler protection balance of the building. A length of 2.5" fire hose and a Hose Monster will be used. Finally, my question is can this be done and use the results and supply point and back feed the other sprinkler system design areas from a Flow test from within the building?? The other option is to go back to the simple solution and shut and drain everything and install permanent By-Passes with control valves around the existing FDC check valves. In this then the 6" BFP on the service entrance could then be Forward Flow Tested annually as is required now. Thank you in advance. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 <tel:(802)%20373-0638> TEL: (802) 434-2968 <tel:(802)%20434-2968> Fax: (802) <tel:(802)%20434-4343> 434-4343 [email protected] _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists. <mailto:[email protected]> firesprinkler.org http://lists.firesprinkler. <http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.or g> org/listinfo.cgi/sprinklerforum-firesprinkler.org
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