5422 Air conditioning for the control room should provide a pressurized

5422 air conditioning for the control room should

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5.4.2.2 Air conditioning for the control room should provide a pressurized environment to preclude the entry of smoke in the event of a fire outside the control room. 5.4.2.3 Plastic ducts, including listed fire-retardant types, should not be used for ventilating systems. Listed plastic fire- retardant ducts with appropriate fire protection are permitted to be used in areas with corrosive atmospheres. 5.4.2.4 Fire dampers (doors) compatible with the rating of the barrier should be provided at the duct penetrations in accordance with NFPA 90A, Standard for the Installation of Air- Conditioning and Ventilating Systems , to the fire area unless the duct is protected throughout its length by a fire barrier equal to the rating required of fire barrier(s) penetrated (see Section 5.1) . 5.4.2.5 Smoke dampers, where installed, should be installed in accordance with NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems . 5.4.2.6 The fresh air supply intakes to all areas should either be located so as to minimize the possibility of drawing prod- ucts of combustion into the plant, or be provided with auto- matic closure on detection of smoke. Separation from exhaust air outlets, smoke vents from other areas, and outdoor fire hazards should all be considered. 5.5 Containment and Drainage. 5.5.1 Provisions should be made in all fire areas of the plant for removal of liquids directly to safe areas or for containment in the fire area without flooding of equipment and without endangering other areas. (See Annex A of NFPA 15, Standard for Water Spray Fixed Systems for Fire Protection.) Drainage and pre- vention of equipment flooding should be accomplished by one or more of the following: (1) Floor drains (2) Floor trenches (3) Open doorways or other wall openings (4) Curbs for containing or directing drainage (5) Equipment pedestals (6) Pits, sumps, and sump pumps 5.5.2* The provisions for drainage and any associated drainage facilities should be sized to accommodate all of the following: (1) The spill of the largest single container of any flammable or combustible liquids in the area (2) The maximum expected number of fire hose operating for a minimum of 10 minutes (3) The maximum design discharge of fixed fire suppression systems operating for a minimum of 10 minutes Independent of the above, the drainage systems should con- sider the maximum water introduced by the wash-down sys- tems. If this amount exceeds the drainage required for fire protection, it should govern the sizing of the drainage system. Additional precautions should be taken for belowgrade areas to prevent damage of equipment due to water buildup. 5.5.3 The drainage system for continuous fuel oil-fired boil- ers should consist of curbs and gutters arranged to confine the area of potential fuel oil discharge. Consideration also should be given to providing the same measures for coal-fired boilers using oil for ignition. Walking surfaces in the vicinity of burn- ers should be made impervious to oil leakage by the use of checkered steel plate, sheet metal drip pans, or other means.
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  • Fall '16
  • asd
  • NFPA, National Fire Protection Association

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