Fuel Gas Systems Exam - Complete Solutions (Answered) Generally, the direction of heated air from a gas unit heater should be toward a location where
... [Show More] the most uniform temperature is desired, usually a space occupied by people not in motion. True A central air gas furnace is a self-contained appliance for heating air by transfer of heat of combustion through metal to the air and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location. False For _______ fittings used in fuel gas systems, the sealing element and fitting are colored or marked yellow to the fitting's application. Press connect The principle of _________ is to heat two thermoplastic surfaces to a designated temperature, and then fuse them together by application of force. heat fusion ________ piping materials may only be used in a building fuel gas distribution system if the system is installed outdoors and below ground. Plastic All codes prohibit the use of Type _______ copper tube for fuel gas systems. M A _________ _________ is installed within a gas piping system for the purpose of preventing overpressure in the downstream piping system. monitor regulator The specific gravity of the natural gas used in the NFPA 54 pipe sizing capacity tables is a specific gravity of _______ ________and can be used for gases up to 0.70 specific gravity. .60 The __________ method of pipe sizing requires only one distance measurement - the length from the meter to the most remote outlet. longest length The ____________ is used in determining a reduction in pipe size for gas piping capacities based on probable use and not full use of a system. diversity factor
According to NFPA 54, ___________ is the number of British thermal units (Btus) produced by the combustion, at constant pressure, of 1 ft? of gas when the products of combustion are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all necessary corrections have been applied. total heating value Most fuel gas codes require a minimum fuel gas appliance outlet size of _____________ and a mobile home service size of 3/4 ½ The schedule number determines the outside diameter of a pipe. False Polyethylene (PE) pipe is rarely used for building gas distribution piping. False Piping materials must have stamps or markings affixed to them by certified manufacturers to indicate the products have been manufactured according to a particular standard. True [Show Less]