Piping shall comply with the following:
(a) Non-metallic piping, if used, shall be installed in accordance with the manufacturer's installation instructions.(b) All vapor return piping and tank vents shall be installed so as to drain toward the gasoline storage tanks. There shall be no sags or traps in the vapor return piping in which any liquid may become trapped. Condensate tanks, if utilized, shall be installed and maintained so as to preclude the blocking of the vapor return lines by liquid.(c) All vapor return and vent piping shall be provided with swing joints or any other State Fire Marshal approved connector at the base of the riser to each dispensing unit, at each tank connection, and at the base of the vent riser where it fastens to a building or other structure. When a swing joint is used in a riser containing a shear section, the riser must be rigidly supported.(d) Tank vent pipes two inches or less in nominal inside diameter shall not be obstructed by any device unless the tank and its associated piping and other equipment is protected to limit back pressure development to less than the maximum working pressure of the tank, its associated piping and other equipment. Protection shall be afforded by the installation of one of the following approved items: Pressure/vacuum vents, rupture disks or other tank venting devices installed in the tank vent pipes.(e) Tank vent pipes shall terminate into the open atmosphere and shall be at least 12 feet above the adjacent ground level. The outlet shall vent upward or horizontally and be located so as to eliminate the possibility of vapors accumulating or traveling to a source of ignition or entering adjacent buildings.(f) Vent pipes from tanks storing the same class of liquids may be connected into one outlet pipe. The vapor discharge capacity of manifolded vent piping shall be sufficient to limit back pressure development to less than the maximum working pressure of tanks, associated piping and other equipment when two tanks are filled simultaneously.(g) Vent pipes shall be adequately supported throughout their length. When they are supporting weights in addition to their own, additional supports may be required.(h) Piping systems servicing vapor balance recovery systems, installed after September 1, 1977 shall be pneumatically tested to 75 psig. Test pressure shall be maintained for at least 30 minutes, with the system sealed, and with a pressure loss not to exceed 3 psig.(j) When there is any indication of a leak in an existing underground storage tank or piping system, the system shall be tested in accordance with and shall meet the criteria of 2001 Edition of the California Fire Code § 7901.11.(k) Vapor pipes shall enter tanks only through the top of the tank. The end of vapor pipes shall not extend into the tank more than one inch. Float check valves attached to such vapor pipes may extend into the tank without distance restrictions.Cal. Code Regs. Tit. 19, § 1918.35
1. Amendment of subsection (j) filed 11-13-80; effective thirtieth day thereafter (Register 80, No. 46).
2. Amendment filed 9-27-85; effective thirtieth day thereafter (Register 85, No. 41).
3. Amendment of subsection (j) filed 10-28-2004; operative 10-28-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 44). Note: Authority cited: Section 41956, Health and Safety Code. Reference: Sections 41956 and 41958, Health and Safety Code.
1. Amendment of subsection (j) filed 11-13-80; effective thirtieth day thereafter (Register 80, No. 46).
2. Amendment filed 9-27-85; effective thirtieth day thereafter (Register 85, No. 41).
3. Amendment of subsection (j) filed 10-28-2004; operative 10-28-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 44).