Fuel gas, as defined in Section 208.0 of the 2015 Uniform Plumbing Code, includes, “natural, manufactured, liquefied petroleum, or a mixture of these”. LPG gas systems, other than those described in Section 1202. 3, would be tested using the criteria found in Section 1213.3. 2. The regulations found in Chapter 12, per Section 1201.1, only apply to fuel gas systems with pressures of 5 psi or less. Testing for a 10 psi system should be tested using requirements found in NFPA 58. 3. No. 4. Yes. Per Section 6.14.1.1 of NFPA 58 requires piping to be tested at not less than normal operating pressure for the system.