Maine Gas Exam | 2023/24

Maine Gas Exam | 2023/24 Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? - 12 Feet Minimum thickness of a steel striker barrier for gas tubing protection? - 0.0508" What is the maximum temp that a clay flue liner must be able to withstand without cracking? - 1,800 degrees F Combustion air obtained from indoors on the same story shall have a minimum of... - Two openings When gas is being supplied by a manifold located in a remote area, what is the maximum distance the shutoff valve at the manifold can be located from the appliance? - 50 feet What reference standard covers the storage of liquid propane gas? - NFPA 58 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 " Maximum distance a gas shut-off valve can be installed from the equipment it serves? - 6 feet Maximum distance off the ceiling of the room shall an indoor combustion air opening be installed? - 12" What is the minimum required clearance for an unlisted pool heater on all sides and rear? - 12" Flanges used for gas piping shall have gaskets made of an approved material designed to withstand temperatures, pressure and chemical constituents of the gas. Which of the following gasket materials is not acceptable? - Rubber When corrosive or flammable fumes or gases are present near appliances, a safe disposal method shall be provided. All of the following are considered flammable or corrosive EXCEPT?! - Anhydrous Citric Acid When a mechanical appliance is installed in an excavation deeper than 12", what shall the excavation be lined with? - Copper pan Which type of regulator is used in series with an another pressure regulator for the purpose of automatically taking over in an emergency the control of the pressure down stream in case the pressure tends to exceed a set maximum? - Monitoring When more than 2 90° elbow's are required in a vent connector, the maximum capacity of the connector shall be reduced for each additional 90° elbow by? - 10% What is the minimum test pressure that can be used for testing newly installed gas piping? - 3 psig What is the minimum vertical distance to the bottom of a combustion air intake located on the exterior of a building above adjacent finish ground level? - 12" 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" What is the maximum btu/hr input for an unlisted decorative appliance installed in a vented fireplace with an 18 foot tall chimney and permanent free opening area of 29 in.²? - 50,400 BTU All of the following piping materials are approved to be used for gas piping except... - Cast Iron What is the minimum size dimension of outdoor combustion air openings? - 3" What is the maximum operating pressure for a low pressure steam boiler? - 15 psi What is the maximum distance between horizontal supports for half inch OD copper tubing used for gas supply piping? - 4 feet What type of valve shall be used at the point of connection when a gas system has supplementary standby gas connected downstream of the meter? - Three-way valve When an appliance is installed in an attic space, what maximum distance from the attic access can the appliance be installed when measured along the centerline? - 20 feet What is the maximum BTU per hour input rating for a listed unvented wall-mounted room heater equipped with an oxygen depletion safety shut off system being installed in a bedroom? - 10,000