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.

5704.2.9.6.1 Tank construction.

The construction of a protected aboveground tank and its primary tank shall be in accordance with FC 5704.2.7.

5704.2.9.6.2 Normal and emergency venting.

Normal and emergency venting for protected aboveground tanks shall be provided in accordance with FC 5704.2.7.3 and 5704.2.7.4. The vent capacity reduction factor shall not be allowed.

5704.2.9.6.3 Secondary containment.

Protected aboveground tanks shall be provided with secondary containment, drainage control or diking in accordance with FC 5004.2 and 6 NYCRR Part 613. A means shall be provided to establish the integrity of the secondary containment in accordance with NFPA 30.