We're doing some driver's training and we are running into some discrepancy over what the NP is for our nozzles. Got SM-20F automatic nozzles. They are fog nozzles, to be pumped at 100 psi, correct? None of the data sheets say. The little slide chart you get seems like they are figuring 80 psi NP, but they sell a line of "LOW PRESSURE" nozzles that operate at 75. 5 pounds lower, and now it's low pressure? However, they say if you don't have a pressure guide slide chart that you "GO BACK TO THE BASICS" and figure 100#. Is it an 80 pounder, or is it a 100 pounder? Does NFPA 1964 say anything about what NP a certain nozzle will operate at to be compliant? Normally this wouldn't bug the **** out of me, but there will be a test at the end, and no one seems to agree that WE AREN'T FLOWING WHAT WE THINK WE ARE!
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