All tanks shall be tested for strength and tightness before they are placed in service in accordance with the applicable code or standard under which they were built. This test shall be made at operating pressure with air, inert gas or water prior to placing the tank in service.
34 Pa. Code § 14a.11
This section cited in 34 Pa. Code § 14a.111 (relating to storage and handling); 34 Pa. Code § 14a.141 (relating to scope and application); 34 Pa. Code § 14a.151 (relating to scope and application); and 34 Pa. Code § 14a.161 (relating to general provisions).