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thanks UFT12; I took a tour through the FM Approval Standard and noted that the plunge tunnel test uses 8.4 ft/sec. Further thoughts are that RTI is a function of the square root of the air velocity, so it lessens the effect a bit? Appreciate any further thoughts; I still can't find any...

re: testing PRV's on sprinkler systems: the drain should have been sized to accommodate the full flow requirement. or use a hose into a barrel. Most important is having two pressure gauges, one up and one downstream. You could probably get away with one pressure gauge downstream if you post...

Hello, does anyone know of dry pendent ESFR heads greater than K17? many thanks for any direction,

It seems that we are finally settling on a solution to MIC, pipe scale, and corrosion in all forms: nitrogen charging, even in wet pipe systems. It makes too much sense and has some good track record so far. Look at NACE for more information on long term tests with black iron vs. galvanized...

As far as I can tell, there is varied opinion about the performance of ESFR sprinklers under automatic roof vents. There is no opinion about ESFR performance in the presence of roof intake or exhaust fans, other than FM 2-0 which proposes a 5 ft/sec air velocity limitation in the vicinity of...