Document qko2yQEQqVwK1OdyrDxQqpod5

43--Fire Protection TABLE 43-B EXTINGUISHERS SUITABLE FOR CLASS A FIRES Baste Minimum Extinguisher Rating for Area Specified Maximum Travel Distances to Extinguishers Areas To Be Protected per Extinguisher Light Hazard Occupancy Ordinary Hazard Occupancy Extra Hazard Occupancy 1A 75 ft 2A 75 ft 3A 75 ft 4A 75 ft 6A 75 ft 10A 75 ft 20A 75 ft 40A 75 ft 3,000 sq ft 6,000 sq ft 9,000 sq ft 11,250 sq ft 11,250 sq ft 11,250 sqftt 11,250 sqftf 11,250 sqftt Not permitted Except as Specified* 3,000 sq ft 4,500 sq ft 6,000 sq ft 9,000 sq ft 11,250 sqftt 11,250 sq ftt 11,250 sqftt Not permitted Except as Specified* Not permitted Except as Specified* 3,000 sq ft 4,000 sq ft 6,000 sq ft 9,000 sq ft 11,250 sqftt 11,250 sqftt * The protection requirements specified in this table may be fulfilled by several extinguishers of lower rat ings for ordinary or extra hazard occupancies, subject to the approval ot the authority having jurisdiction Consideration should be given to the number of persons available to operate the extinguishers, the degree of training provided, and the possibility of use by women 111,250 sq ft is considered a practical limit From National Fire Protection Association Standard No 10, Tabic 4110 For flammable liquids of appreciable depth (over K in ), such as those m dip or quench tanks 1 Class B fire extinguisheis should be pro vided on the basis of one numerical unit of Class B extinguishing potential per squaie foot of flammable liquid surface of the largest tank to be protected within the area 2 Two or more extinguishers of lower ratings, except for foam extinguishers, shall not be used in lieu of the extinguishei requn ed foi the largest tank Up to three foam ex tinguishers may be used to fulfill these requirements 3 When protection is sought for flammable liquid in appreciable depth and when the liquid surface area is in excess of 20 square feet, the piotection lequirements should be based on an evaluation of the extent of the hazard and engineeting judgment ap plied Consideration should be given to installing fixed protection and wheeled ex tinguishers svstems Portable extinguisher protection for such hazaids should be gen erally restricted to plants having trained fire brigades 4 Wheie approved automatic fire protection devices 01 svstems have been installed foi a flammable liquid, additional portable Class B file extinguishers, as required m paragiapli 1, mav be waived When so waived. Class B extinguishers should be piovided to piotect aieas near such pro tected hazards 5 Travel distances should be given considera tion with leference to special hazards and 1346