5703.6.6.1 Backflow protections.
FC § 5703.6.6.1
Connections to pipelines or piping by which tank cars, cargo tanks, marine vessels, watercraft or other equipment discharge liquids into storage tanks shall be provided with check valves or block valves for automatic protection against backflow where the piping arrangement is such that backflow from the system is possible. Where loading and unloading is done through a common pipe system, a check valve is not required except as required by the applicable provisions of the New York State Department of Environmental Conservation regulations, as set forth in 6 NYCRR Section 613. However, a block valve shall be provided which is located so as to be readily accessible or remotely operable.
