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§3404-03 Indoor and Aboveground Combustible Liquid Storage Systems
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(a) Scope. This section sets forth requirements for the design and installation of indoor, aboveground combustible liquid storage systems, except fuel oil storage tanks and auxiliary storage tanks for oil-burning equipment regulated by the Mechanical Code, or to the installation of liquid motor fuel-dispensing storage tanks.
(b) General Provisions. Indoor aboveground combustible liquid storage tanks shall comply with the requirements of FC Chapters 27 and 34 and this section.
(c) Design and Installation Requirements.
(1) Location of tanks. Combustible liquid storage tanks shall preferably be installed on the floor at grade level. Combustible liquid storage tanks may also be installed on floors not more than two (2) floors below grade level.
(2) Fire-rated separation of tanks.
(A) Combustible liquid storage tanks having an individual or aggregate capacity of more than 550 gallons but less than 1,100 gallons in a single control area shall be completely enclosed within noncombustible construction having at least a two (2) hour fire resistance rating.
(B) Combustible liquid storage tanks having an individual or aggregate capacity of 1,100 gallons or more in a single control area shall be completely enclosed within noncombustible construction having at least a three (3) hour fire resistance rating.
(3) Sprinkler system protection.
(A) Any floor below grade level upon which a combustible liquid storage tank is installed shall be protected throughout by a sprinkler system, except that that when the combustible liquid storage tank will only store a combustible liquid with a flash point of 200°F or greater, and the room or area is segregated, vertically and horizontally, from surrounding spaces by a fire separation of not less than two (2) hour fire resistance rating, only the room or area housing such tank need be protected by a sprinkler system.
(4) Piping systems.
(A) General requirements.
(1) Exposed piping shall be protected against mechanical damage and shall be adequately supported with rigid metal fasteners or hangers.
(2) Only new wrought iron, steel, or brass pipe, or type K or heavier copper tubing shall be used. Metal tubing used as transfer piping shall be adequately protected.
(3) Overflow pipes, where installed, shall not be smaller in size than the supply pipe.
(4) Pipe shall be connected with standard components, and tubing with components listed or approved for the same material as the pipe, except that malleable iron fittings may be used with steel pipe. Cast iron fittings shall not be used. All threaded joints and connections shall be made liquid-tight with suitable pipe compound. Unions requiring gaskets or packing, right or left couplings and sweat fittings employing solder having a melting point of less than 1,000°F shall not be used.
(B) Piping from storage tank to equipment on other floors.
(1) Piping from a transfer pump to manufacturing, process or other equipment installed on other floors, including combustible liquid return and vent piping, shall comply with the applicable provisions of R3404-03(c)(4) and shall be enclosed in a shaft constructed of four (4) inch concrete or masonry, having a four (4) inch clearance from all pipe or pipe covering, except that no such enclosure shall be required within the room containing the pump, tank, or equipment where such room is itself enclosed with construction and materials having at least a 2-hour fire-resistance rating. Provisions shall be made for expansion in piping without the use of expansion joints.
(2) Where it is necessary to make horizontal offsets in supply piping, upon exiting the shaft, such piping shall be enclosed in a sleeve of other piping of at least number ten (10) gauge steel, two (2) sizes larger and arranged to drain into the shaft. Horizontal piping offsets shall be further enclosed in construction having a two (2) hour fire resistance rating, except that no such enclosure shall be required within the room containing the pump, tank, o equipment where such room is itself enclosed with construction and materials having at least a 2-hour fire-resistance rating.
(3) A drain pipe shall be installed at the base of the shaft enclosing the supply and overflow piping. The pipe shall lead to a dedicated sump or container with a capacity of at least 55 gallons. Such sump or container shall be equipped with a leak detection system alarm, arranged so as to sound an alarm and stop the transfer pump. The alarm shall be connected to a local audible alarm and to a remote alarm located at a supervising station. The wiring shall comply with the Electrical Code.
(4) Piping shall be seamless steel pipe of a weight not less than ASA Schedule 40, with welded connections up to the equipment, except that fittings at the tank or equipment, shutoff valves and other combustible liquid flow and control devices may be screwed or flanged.
(5) Pipe shafts shall not be penetrated by or contain other piping or ducts.
(5) Transfer of combustible liquids between floors.
(A) A clearly identified and readily accessible remote control switch shall be provided on each floor to which combustible liquid is transferred. Such switch, when manually activated, shall cause shut down of the transfer.
(B) A visual indicating device shall be provided in the discharge area that indicates when the pump is running.