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5704.2.9.5.2 Separation between adjacent stable or unstable liquid tanks.
The separation between tanks containing stable liquids shall be in accordance with NFPA 30. Where tanks are in a diked area containing Class I or II liquids, or in the drainage path of Class I or II liquids, and are compacted in three or more rows or in an irregular pattern, the commissioner may require greater separation than specified in NFPA 30 or other means to make tanks in the interior of the pattern accessible for firefighting purposes. The separation between tanks containing unstable liquids shall not be less than one-half the sum of their diameters.
Exception: Tanks used for storing Class IIIB liquids are allowed to be spaced 3 feet (914 mm) apart unless within a diked area or drainage path for a tank storing Class I or II liquids.
5704.2.9.5.3 Separation between adjacent tanks containing flammable or combustible liquids and LPG.
The minimum horizontal separation between an LPG container and a Class I, II or IIIA liquid storage tank shall be 20 feet (6096 mm) except in the case of Class I, II or IIIA liquid tanks operating at pressures exceeding 2.5 psig (17.2 kPa) or equipped with emergency venting allowing pressures to exceed 2.5 psig (17.2 kPa), in which case the provisions of FC 5704.2.9.5.2 shall apply. An approved means shall be provided to prevent the accumulation of Class I, II or IIIA liquids under adjacent LPG containers such as by dikes, diversion curbs or grading. When flammable or combustible liquid storage tanks are within a diked area, the LPG containers shall be outside the diked area and at least 10 feet (3048 mm) away from the centerline of the wall of the diked area.
Exception: Horizontal separation is not required between LPG containers and underground flammable and combustible liquid tanks.
5704.2.9.6 Additional requirements for protected aboveground tanks.
In addition to the requirements of this chapter for aboveground tanks, the installation of protected aboveground tanks shall be in accordance with FC 5704.2.9.6.1 through 5704.2.9.6.9.
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