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Oct 09 03 09: 13a AIRNET 99371087 p. l TANK STORAGE 30--23 (h) Where the means of secondary containment is 2.3.2-5.3 Openings for gauging on tanks storing Class I Iiq- iclosed, it shall be provided with emergency venting in aids shall be provided with a vaportight cap or cover. cordance with 2.23.2. (i) Means shall be provided to establish the integrity of 2.3.2.5.4* Fill pipes that enter the top of a tank shall termi- nate within 6 in.(190 mm)of the bottom ofthe tank.Fill pipes x,4,2.4.The secondary containment shall be designed to with- shall be installed or arranged so that vibration is minimized. y stand the hydrostatic head resulting from a leak from the pri- Exception No. 1, fill pipes in tanks whose vapor span under the ew- maty tank of the maximum amount of liquid that can be pected range of normal operating conditions is not in the flammable stored in the primary tank. range or is inerted need not mist this requirement. 2.3.2.5.4 Equipment,Piping,and Fire Protection System,in Exception No. 2: Fill pipes in tanks hand'ung liquids with minimal Remote Impoundment Areas or Diked Areas- potential for accumulation of static electricity+nerd not meet this m quirement provided that the fill fire is deigned and the system is oper- 2,3-2.3.4.1* Piping Location. Only piping for product, util- aced to auoid mist generation and an adequate keel of residence time ity,or fire protection purposes directly connected to a tank or is provided downstream of fitters or sarens such that the charge goner_ tanks within a single diked area shat[ be routed through a aced is dissipated dik area,a e impoundment arm a to and mo impoundment area, r above a storrageatank drain 2-3.2.5.5 filling and emptying connections for Class 1,C1�II, age area where the piping can be exposed to a fire. and Class IIIA liquids that are connected and disconnected shall be located outside of buildings ata location free from any Exception: Piping for other product lines and from adjacent tanks source of ignition. They shall be located not less than 5 ft .shall be permitted to be routed lhrnugh such areas if engineering de- (1,5 m)away from any building opening.Such connections for signs are provided to incorporate features to prrurnl the piping from any liquid shall be closed and liquid tight when not in use and creating an exposure hazard. shall be properly identified. 2.3.2.3.4.2 Drainage. Drainage shall be arranged to prevent 2,3.2.6 Requirements for Abovegrormcl Tanks Located in An accumulation of any liquid under the piping by sloping the PAS Subject to Flooding. grade in accordance with 2,3.2.32. Corrosion-resistant pip- ing and piping that is protected against corrosion shall be 2.3.2.6.1 Vertical tanks shall be located so that the tops of the permitted to be buried where such drainage is not provided tanks extend above the maximum flood stage by at least 30 or is not practical. percent of their allowable storage capacity. 2.3.2.3.4.3* Equipment Location. If located in a remote 2.3.2.6.2 Horizontal tanks that are located where more than impoundment area,a diked area,or a spillway draining to a 70 percent of the tank's storage capacity will be submerged at remote impoundment area, process equipment, pumps, the established flood stage shall be secured by one of the Fol- instrumentation,and electrical utilization equipment shall be (owing methods: located or protected so that a fire involving such equipment (1) Anchored to resist movement docs not constitute an exposure hazard to the tank or tanks in (2) Attached to a foundation of steel and concrete or of con- thesame area for a period of time consistent with the response trete having sufficient weight to provide adequate load and suppression capabilities of the fire-fighting operations for the tank when filled with liquid and submerged by mailable to the location. flood water to the established flood stage 2.3.2,3.4,4 Fire protection Systems. Hose connections, con- (3) Adequately secured from floating by other means trots,and control valves forapplication of fire protection foam Tank vents or other openings that are not liquidtight shall or water to tanks shall be located outside remote impound- extend above the maximum flood stage water level. stent areas, diked areas, or spillways draining to a remote 2,3.2.6.3 A dependable water supply shall be available fill- ingforimpoundment area. an empty or partially filled tank. 2.3,23.4.5 Combustible Materials. Structures such as stair- Exception: ll'ltere felling the tank with wateris unpractical orhaxard. I-)",walkways,instrumentation shelters,and supports for pile ow because of the contents of the tank, the lank shall be prwlected by 1219 and equipment that are located in a remote impoundment other means against movement or collapse. arca,diked area, or spillway draining to a remote impound- mentarea shall be constructed of noncombustible materials. 2.3.2.6.4 Spherical or spheroid tanks shall be protected by 2.3.2,4 Vent Piping for Aboveground Tanks. Piping for nor- any of the methods specified in this subsection. coal and emergency relief venting shall be constructed in 2'3.2'7 Installation Instructions- Factory-built aboveground accordance with Chapter3. tanks shall be provided with instructions for testing and for 2.3-2.5 T Other than Vents for Aboveground installation of the normal and emergency vents. aids Openings Tom. 2.3.3 Installation of UndergroundTanks. 2'3.2.5.1 Each connection to an aboveground tank through 23.9.1 Location. Excavation for underground tanks shall be Much liquid can normally flow shall be provided with an inter- made with due care to avoid undermining of foundations of s'tl°ran external valve looted as close as practical to the shell existing structures.Underground tanks or tanks under build- ""the tank ing3 shall be so located with respect to existing building foun- 2.3.2,5 2 q g dations and supports that the loads carried by the latter Each connection below the liquid level through cannot be transmitted to the tank-The distance from any pan liquid does not normal! flow shall be provided with a of a tank storm ass li base- hrlu,,Id ht g ClI quids to the nearest wall of an y g closure such as a valve,plug,or blind,or a combi- mens or pit shall be not less than 1 ft(0.3 m),and to any prop- �ruinn oFthese_ arty line that can be built upon,not less than 3 ft(0.9 m).The 2000 Edison