2206.9.2 Initial Piping Test

Prior to backfill, primary piping shall be tested hydrostatically to one and one-half times the maximum anticipated operating pressure, but not less than 15 pounds per square inch (psig)(103.4 kPa). After backfill and installation of the top slab, discharge piping shall be tested hydrostatically at one and one-half times the maximum anticipated pressure, but not less than 50 pounds per square inch (psig)(345 kPa). Secondary containment piping (annular space) shall be tested pneumatically at 5 pounds per square inch (psig)(34.5 kPa) utilizing an inert gas; however, air may be used if the tank system or piping system does not contain any liquid motor fuel or combustible vapor. Hydrostatic test pressure shall be maintained for sufficient time to complete visual inspection but not less than 1 hour. The test shall show that there is no evidence of leakage. Test pressure for aboveground tank piping shall be at one and one-half times the maximum anticipated operating pressure but not less than 100 pounds per square inch (psig)(690 kPa).