Do any members of this group have a solid background in NFPA 25 and inspections? I do not. I have an issue where my inspector has Red Tagged a riser because the results of a main drain test have weakened over the years. This system is over 30 years old so I do not have a system information plate to look at to see what the original main drain test was, but I do have some inspection reports dating back to January of 2014. At that time the client had a static of 55 and a residual of 48.
Current reading is about 70/28 Hydrant flow tests from the original calcs, last year and this year show no loss in city pressure. Can anyone tell me where I should be looking for trouble? I believe the control valve on the private line is all the way open. The control valves on the backflow are open and the backflow passes inspection. Is the only thing left an obstruction in the fire line? Could corrosion alone cause this issue? We put a pitot before the backflow, after the backflow and at the system riser. The water wasn't great anywhere. And when we opened those fittings we saw a fair amount of corrosion on the vertical underground pipes. Can we assume some corrosion on the vertical pipes means there is a lot more on the horizontal? Were we correct to red tag this riser in the first place? John Irwin - CET Division Manager - Fire Sprinklers Critical System Solutions, LLC License Number: FPC16-000053 2830 Scherer Drive, Suite 300 St. Petersburg, FL 33716 Office: 727.209.5122 Fax: 727.209.5126 Cell: 813.618.2781 Email: [email protected]<mailto:[email protected]> [cid:[email protected]]
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