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immediate “danger to life or property,” the code official can immediately disconnect without prior notice. Section 304, Combustion, Ventilation and Dilution Air Applies when 1) gas-fueled equipment is installed inside a building, and 2) the equipment requires air for combustion, ventilation or dilution of flue gasses from within the building. Direct venting to the outside overrides this section. Chapter 4, Gas Piping Installations Chapter 4 establishes criteria for the minimum/maximum pipeline sizes for a given appliance, construction materials, shut-off valve locations, metering devices, etc. There is nothing in this section that specifically prohibits the installation of a microturbine unit. Chapter 5, Chimneys and Vents This section covers the installation, maintenance, repair, and approval of factory-built chimneys, chimney liners, vents, connectors, and masonry chimneys. Every fuel-burning appliance is required to discharge all combustion products to the outdoors. Section 501.8 lists exempted equipment, of which microturbine units do not qualify (e.g., clothes dryers, cooking ranges, refrigerators, counter appliances, etc.) Microturbines, if subjected to this section, will be declared a category III or IV appliance. In residential applications, the venting system would default to the manufacturers’ listed equipment. In commercial or industrial applications, a chimney, ventilating hood, and exhaust system all would be required. Chapter 6, Specific Appliances Section 615.1, Engine and Gas Turbine-Powered Equipment, requires that permanently installed equipment powered by internal combustion engines and turbines be installed in accordance with the manufacturer’s installation instructions and in accordance with NFPA 37 (Stationary Combustion Engines and Gas Turbines). 5.3.2 NFPA 54, National Fuel Gas Code This is the governing code used by many local gas utilities and officials of federal, state, and local governments to judge the acceptability of fuel-gas installations. Many appliance manufacturers as part of their certified installation instructions also reference the code. 5.3.3 NFPA 30, Flammable and Combustible Liquids Code, and NFPA 58, LP-Gas Code These two standards address the storage and handling of fuel liquids and, as such, do not impact the first-generation microturbine products. 5.3.4 International Mechanical Code - 2000 5.8PDF Image | PNNL 13277
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