34 Pa. Code § 14a.58
All piping before being covered, enclosed, or placed in use shall be tested hydrostatically, with air pressure, or by other methods approved by the fire marshal. If piping is tested hydrostatically, the test pressure shall be 150% of the maximum anticipated pressure of the system. If piping is tested pneumatically the test pressure shall be 110% of the maximum anticipated pressure of the system, but not less than 5 psig at the highest point of the system. A pneumatic test shall include a preliminary check at not more than 25 psig The pressure shall be increased gradually in steps providing sufficient time to allow the piping to equalize strains during the test and to check for leaks. The test shall be maintained for at least ten minutes with no drop in pressure or for sufficient time to complete visual inspection of all joints and connections.
34 Pa. Code § 14a.58
This section cited in 34 Pa. Code § 14a.8 (relating to vents); 34 Pa. Code § 14a.26 (relating to testing); 34 Pa. Code § 14a.51 (relating to scope and application); 34 Pa. Code § 14a.52 (relating to general design specifications); and 34 Pa. Code § 14a.161 (relating to general provisions).