NAC459.9936. Marina storage tanks: Piping and valves.

     1. If, on a marina storage tank:

     (a) A submersible pump is used, a listed emergency shutoff valve must be installed at each dispensing device.

     (b) A suction pump-type dispensing device is used, a listed vacuum-actuated shutoff valve with a shear section or equivalent-type valve must be installed directly under each dispensing device.

     2. Piping and valves subject to pressure extremes caused by thermal expansion of the contents must be equipped with a pressure-relieving device that has secondary containment.

     3. Aboveground piping runs must be enclosed in protective containment leading to a catch basin equipped with an operating automatic leak-detection audible alarm and shutoff device.

     4. Except as otherwise provided in subsection 5, any new or replacement underground piping installed after October 31, 2005, must be:

     (a) Constructed of nonmetallic components;

     (b) Double-walled and integral with a listed leak sensor; and

     (c) Installed with a tracer locator wire installed in all buried piping trenches.

     5. Existing facilities which have metallic or single-walled nonmetallic piping and which are permanently relocated to a fuel island must install dispenser sumps with leak sensors. Any additions to the metallic piping must be nonmetallic single- or double-walled piping.

     6. For piping used at floating marinas:

     (a) Suitable lengths of oil-, weather- and UV-resistant flexible hose, UL-approved for use at marinas, must be used between the onshore piping and the piping on the floating structure.

     (b) Piping at all hinge locations must be connected with UL-approved listed flexible piping.

     (c) All docks and pier installations must have double-walled piping.

     (d) A listed emergency breakaway device designed to retain liquid on both sides of the breakaway point must be installed in a spill containment box monitored with a leak sensor on each line serving the dock and anchored at the onshore end of the piping.

     (Added to NAC by Environmental Comm’n by R083-05, eff. 10-31-2005)