5704.2.11.5.2 Leak detection.

Underground storage tank systems shall be provided with an approved method of leak detection from any component of the system that is designed and installed in accordance with NFPA 30. Leak detection systems shall be tested at the time of installation at the owner's risk by his or her representative before a representative of the department.

5704.2.11.6 Periodic tank and piping test.

Any underground single-walled flammable or combustible liquid storage tank existing prior to the effective date of this code that is not provided with a leak detection system meeting the requirements of FC 5704.2.11.5.2 shall be precision tested at least once every 5 years.

   Exception: Bulk plant and terminal tanks.

5704.2.11.7 Emergency tank and piping system test.

The commissioner may require a tank and piping system to be precision tested, pressure tested or tested by other approved method in accordance with this section to determine the condition of the tank or piping or when the commissioner has good cause to believe that a leak exists. Storage systems that may contain flammable or combustible liquid vapor shall not be tested pneumatically. Such tests shall be conducted at the owner's risk by his or her representative.

5704.2.12 Testing.

Tank testing required by FC 5704.2.12.1 through 5704.2.12.3 shall be at the owner's risk by his or her representative before a representative of the department.

5704.2.12.1 Acceptance testing.

Prior to being placed into service, tanks shall be tested in accordance with NFPA 30.

5704.2.12.2 Testing of underground tanks.

Underground tanks shall be tested hydrostatically at 15 pounds per square inch (psig) (103.4 kPa), or 150 percent of the maximum anticipated static head pressure, whichever is greater, for the inner tank, and pneumatically or hydrostatically at 5 pounds per square inch (psig) (34.5 kPa) for the annular space (secondary containment tank). When a pneumatic test is allowed, an inert gas shall be used; however, air may be used if the tank does not contain any flammable or combustible liquid vapor. Test pressure shall be maintained for sufficient time to complete visual inspection, but not less than 1 hour. A tank shall be deemed to have passed the test if it shows no evidence of leakage or permanent deformation.