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4.4.1 NFPA 37 Scope - Size Limits The previous 7500-horsepower limitation in the scope of the standard has been removed. There is no minimal horsepower threshold for engines or gas turbines so microturbines would be subject to the requirements set forth in this standard. This standard applies to fire safety for the installation and operation of stationary combustion engines and gas turbines. It also applies to portable engines that remain connected for use in the same location for a period of one week or more and that are used instead of or to supplement stationary engines. For engines used in essential electrical systems in health care facilities, also see NFPA 99, Standard for Health Care Facilities. For engines used in emergency power supplies, also see NFPA 110, Standard for Emergency and Standby Power Systems. The term combustion gas turbine as used is inclusive of microturbines and, therefore, the standards requirements apply to microturbines. The standard does not address the electric generating component of the microturbine generator unit. Chapter 3 of the standard addresses general requirements for engine locations (in, on, and outdoors near buildings), electrical installations in rooms containing engines (NFPA 70 by reference), engine wiring, and other general installation requirements (reference to applicable NFPA codes and standards), and to those portions of existing equipment and installations that are changed or modified establishes requirements for locating microturbine engines in, on, or near buildings. Chapter 4 addresses gas piping and references NFPA 54 for systems at service pressures of 125 psig and less and NFPA 58 for LP-gas systems. It prescribes the minimal components of a gas train for engines as containing a manual shutoff valve, regulator, low-pressure switch, automatic safety shutoff valve, automatic control valve, manual leak test valve, and high-pressure manual reset switch with exceptions. Boosters or compressors, if used, shall be approved for the service intended and receivers, if used, must be stamped as complying with the ASME Boiler and Pressure Vessel Code. Chapter 5 addresses Class 1 liquid fuels such as gasoline, gasohol, and alcohol, and liquid fuels other than Class 1 such as diesel fuel, fuel oils, jet fuel, and kerosene. The only microturbine concern in this chapter is a statement that LP-gas systems in the liquid phase must be installed per NFPA 58. Chapter 6 presents general requirements related to lubricating systems and some requirements specific to gas turbine oil reservoirs. Technologies not employing lubricating oil reservoirs would have no interest in this chapter. Chapter 7 addresses engine exhaust systems and clearances to combustible materials for exhaust gas temperatures less than 1400°F that would apply to microturbine installations. 4.7PDF Image | PNNL 13277
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