S-12 fdny sprinkler exam with complete solutions

S-12 fdny sprinkler exam with complete solutions what is the minimum size of threaded rod required for sprinkler piping? - Answer ️️ -3/8 inch how often are fire department connections hydro-statically tested? - Answer ️️ -every 5 years sprinkler heads exposed to corrosive conditions are covered with what? - Answer ️️ -wax or lead automatic sprinkler systems have what color caps on the fire department connections? - Answer ️️ -green non automatic sprinkler systems have what color caps on the fire department connections? - Answer ️️ -silver in a pressurized tank the water rot air ratio is what - Answer ️️ -2 to 1 which means 2 parts water to 1 part air which also means 66.33% water and 33.67%air sprinkler heads are factory tested at what psi? - Answer ️️ -400 inspection records are maintained on site for how long? - Answer ️️ -3 years underwriters labs and factory mutual are what? - Answer ️️ -testing companies a quick response sprinkler has an RTI ( response time index) of what? - Answer ️️ -50 a standard sprinkler has RTI of what? - Answer ️️ -80 a sprinkler system with open heads is called a? - Answer ️️ -Deluge system the freezing point if ant freeze solutions is measured by what? - Answer ️️ -hydrometer or refractometer local law 58/2009 requires sprinkler and stand pipe risers to be painted what color? - Answer ️️ -yellow the distance for the hanger assembly to the center line of an upright sprinkler head should be? - Answer ️️ -3 inches the automatic ball drip is located where? - Answer ️️ -Between lower check valve and fire department connection what is the purpose of a ball drip? - Answer ️️ -to prevent freezing in the line the build up of foreign matter on a sprinkler head is called? - Answer ️️ -loading when a sprinkler head opens it is said to? - Answer ️️ -be fused the minimum air pressure inside a pressure tank is? - Answer ️️ -75 psi a gravity tank should be atlas how many feet abov