acceptable alternative is to locate single-wall piping in sealed pipe chases/shafts with at least a 2 hour fire rating.
5. Protect and arrange fuel distribution systems located inside important buildings as follows: a. Arrange the fuel distribution system to automatically shut down the flow of fuel in the event of a fire or detected leak that involves or exposes the tank room, pump room, generator room or fuel piping anywhere along its path through the building. At a minimum, install and arrange safety shut-off valves or positive displacement pumps to isolate all fuel tanks, including day tanks, pipe headers and tanker trucks. Use of a fusible link operated valve is an acceptable way to shut-off discharge line(s) from day tanks or pipe headers, up to 660 gal in size, located in the generator room. b. Arrange pumps to operate on fuel demand (i.e. low day tank level PLUS generator operation). This arrangement may require that pumps be arranged to run manually to top-off tanks after engine tests. Arrange manual pump operation via a dead-man type switch. c. Provide a manual remote shut-off for the fuel pumps and safety shut off valves in a readily accessible location under fire conditions (e.g., outside pump, tank or generator rooms and at the main alarm panel). a. Provide fire rated construction to isolate generators that are located either above or below grade level with a concrete or masonry vault or provide a 3 hour fire rated cut-off room. Exterior walls do not need to be fire rated. b. For roof mounted generators, generator room should be of non- combustible construction with containment provided as described below. The generator room should not expose any other building areas. c. For generators that are located at grade level, provide a cut-off room with a minimum fire rating of 1 hour and locate the room along and outside wall with openings accessible to firefighters. Generator Room 1. Where generators must be located inside buildings isolate them as follows:
2. In addition to fire resistive construction:
a. Design the generator room or vault, regardless of location, to contain the entire content of all fuel tank(s) located in generator room plus a minimum of a 2 in. freeboard through the use of curbs or dikes (minimum curb height of 4 in). b. Provide liquid tight floors and walls to the height of the curb. c. Provide an emergency drainage system in the generator room or provide a special protection system. d. Arrange the cut-off room to provide ventilation and room exhaust from/to areas outside the main building. e. Fuel headers are not recommended for new construction.
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