Maine Gas Exam - with codes Questions and Answers New (2024/2025) Solved 100% Correct

A 10" natural gas main pipe is installed to supply a power plant; however, the pipe has a bad valve that must be replaced. How much of the 10" must be purged with inert gas before work can begin? - All of it NFPA 54 Table 8.3.1 A 127 foot long gas line is being installed in metallic pipe. The system is undiluted LP gas with an inlet pressure of 11.0 in w.c., with a 0.5 in. w.c. pressure drop and a specific gravity of 1.50. The appliance requires 1,670 cubic BTU of LP gas. What size metallic pipe should be installed? - 2" A 4" natural gas pipe must be purged with inert gas before servicing. What is the MAXIMUM length of pipe before purging is required? - Greater than 15 feet NFPA 54 8.3.1 A 520 foot long gas line is being installed in semi-rigid Type K copper tubing. The system is natural gas less than 2 psi, with a 0.3 in. w.c. pressure drop and a specific gravity of 0.60. The appliance requires 135 cubic feet of gas. What size tubing should be installed? - 1-1/2" A building with roof-mounted, gas-fired equipment shall have a permanent inside means of access when the height of the building is more than.. - 15 feet in height NFPA 54 9.4.3.2 A commercial building has a 45 foot tall chimney with a total of 341,000 Btu input from one Category 1 natural draft vented appliance that has a Type B metal connector with a 10 foot lateral. What size masonry chimney is needed? - 8"A compressed natural gas (CNG) motor vehicle fueling facility shall be installed to meet which of the following standards? - NFPA 52 A factory has a 38 foot tall masonry chimney with a total of 962,000 BTU input from two Category I fan assisted vented appliances that have a single-wall metal connector with a two foot lateral. What size chimney is needed? - 9" A fuel-fired appliance is installed in a garage . What MINIMUM distance above the floor shall the source of burner ignition be located? - 18" NFPA 88 A gas supplied illuminating appliance shall be mounted on a post that is 6ft. What size post shall be installed to support the fixture? - 2-1/2" post, .064 thick steel, or 1" schedule 40 pipe NFPA 54 10.16.4 A house has a 19 foot tall chimney with a total of 185,000 BTU input from one Category I natural draft vented appliance that has a single-wall Metal connector with a 5 foot lateral. What size Type B chimney is needed? - 6" A large house is being built with one boiler 34 feet away from the meter that uses natural gas; all other appliances are electric. What size CSST stainless steel tubing should be installed to supply 220 cubic feet of natural gas per hour with an inlet pressure less than 2psi, pressure drop of 0.5 in w.c. and a specific gravity of 0.60? - 37 A residential boiler or furnace with a listed gas conversion burner and draft hood with a type B gas vent shall have a minimum clearance from combustible materials of? - 6" NFPA 54 Table 12.8.4.4A residential-type or low-heat appliance chimney shall terminate what MINIMUM distance above the highest point of the roof where they pass through? - 3 Feet NFPA 54 12.6.2.1 A service station is being built with one boiler 28 feet away from the meter that uses natural gas; all other equipment is electric. What size K or L semi-rigid copper tubing should be installed to supply 205 cu. ft. of gas per hour with an inlet pressure less than 2 psi, pressure drop of 0.3 in. W.C. and a specific gravity of 0.60? - 1 " A single-wall metal vent pipe, using a thimble to pass through a roof made of combustible material, shall be installed what MINIMUM distance above and below the roof? - 18" above and 6" below NFPA 54 12.8.4.5 All of the following piping materials are approved to be used for gas piping except... - Cast Iron NFPA 54 5.6.2.1 All steam and hot water boilers are required to have a pressure relief valve. All of the following are required for installation of the relief valve EXCEPT the... - discharge pipe shall drain into a sump tank An air conditioning system controls all of the following EXCEPT - Odor An appliance installed in an attic shall have a platform to service in front of the appliance. What is the MINIMUM size of the structure? - 30" X 30" NFPA 54 9.5.2An unlisted clothes dryer shall have what MINIMUM clearance from the exhaust duct to combustible materials? - 18" NFPA 54 10.4.1(3) An unlisted floor furnace shall have a temperature limit control that will shut off gas supply if the air temperature at the air outlet register exceeds... - 350 degrees F above room temperature NFPA 54 10.11.2.2 Appliances installed in an underground parking garage shall be installed to meet which of the following standards? - NFPA 88A