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Chapter 13 — FUEL GAS PIPING

1308.6 Gas Meters. Gas meters shall be selected for the

California Mechanical Code (Title 24, Part 4) · 2022 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

maximum expected pressure and permissible pressure drop.

[NFPA 54:5.7.1]

1308.6.1 Location. Gas meters shall be located in ventilated spaces readily accessible for examination, reading, replacement, or necessary maintenance. [NFPA 54:5.7.2.1] 1308.6.1.1 Subject to Damage. Gas meters shall not be placed where they will be subjected to damage, such as adjacent to a driveway, under a fire escape, in public passages, halls, or where they will be subject to excessive corrosion or vibration.

[NFPA 54:5.7.2.2] 1308.6.1.2 Extreme Temperatures. Gas meters shall not be located where they will be subjected to extreme temperatures or sudden extreme changes in temperature or in areas where they are subjected to temperatures beyond those recommended by the manufacturer. [NFPA 54:5.7.2.3] 1308.6.2 Supports. Gas meters shall be supported or connected to rigid piping so as not to exert a strain on the meters. Where flexible connectors are used to connect a gas meter to downstream piping at mobile homes in mobile home parks, the meter shall be supported by a post or bracket placed in a firm footing or by other means providing equivalent support. [NFPA 54:5.7.3] 1308.6.3 Meter Protection. Meters shall be protected against overpressure, backpressure, and vacuum. [NFPA 54:5.7.4]

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FUEL GAS PIPING

1308.5.8.1 Joint Design. The joint shall be designed and installed so that the longitudinal pullout resistance of the joint will be at least equal to the tensile strength of the plastic piping material. [NFPA 54:5.6.8(1)] 1308.5.8.2 Heat Fusion Joint. Heat fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gastight joints at least as strong as the pipe or tubing being joined. Joints shall be made with the joining method recommended by the pipe manufacturer. Heat fusion fittings shall be marked “ASTM D2513.” [NFPA 54:5.6.8(2)] 1308.5.8.3 Compression-Type Mechanical Joints. Where compression-type mechanical joints are used, the gasket material in the fitting shall be compatible with the plastic piping and with the gas distributed by the system. An internal tubular rigid stiffener shall be used in conjunction with the fitting. The stiffener shall be flush with the end of the pipe or tubing and shall extend at least to the outside end of the compression fitting when installed. The stiffener shall be free of rough or sharp edges and shall not be a force fit in the plastic. Split tubular stiffeners shall not be used. [NFPA 54:5.6.8(3)] 1308.5.8.4 Liquefied Petroleum Gas Piping Systems. Plastic piping joints and fittings for use in LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.6.8(4)] 1308.5.9 Flange Specifications. Cast iron flanges shall be in accordance with ASME B16.1. [NFPA 54:5.6.9.1.1] 1308.5.9.1 Steel Flanges. Steel flanges shall be in accordance with the following: (1) ASME B16.5 or (2) ASME B16.47. [NFPA 54:5.6.10.1.2] 1308.5.9.2 Non-Ferrous Flanges. Non-ferrous flanges shall be in accordance with ASME B16.24.

[NFPA 54:5.6.9.1.3] 1308.5.9.3 Ductile Iron Flanges. Ductile iron flanges shall be in accordance with ASME B16.42.

[NFPA 54:5.6.9.1.4]

1308.5.9.4 Dissimilar Flange Connections. Raised-face flanges shall not be joined to flat-faced cast iron, ductile iron or nonferrous material flanges.

[NFPA 54:5.6.9.2] 1308.5.9.5 Flange Facings. Standard facings shall be permitted for use under this code. Where 150 psi (1034 kPa) steel flanges are bolted to Class 125 castiron flanges, the raised face on the steel flange shall be removed. [NFPA 54:5.6.9.3] 1308.5.9.6 Lapped Flanges. Lapped flanges shall be used only aboveground or in exposed locations accessible for inspection. [NFPA 54:5.6.9.4]

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262 2022 CALIFORNIA MECHANICAL CODE

1308.6.4 Identification. Gas piping at multiple meter installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied and attached by the installing agency. [NFPA 54:5.7.5]

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — VENTILATION AIR
  5. Chapter 5 — EXHAUST SYSTEMS
  6. Chapter 6 — DUCT SYSTEMS
  7. Chapter 7 — COMBUSTION AIR
  8. Chapter 8 — CHIMNEYS AND VENTS
  9. Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
  10. Chapter 10 — BOILERS AND PRESSURE VESSELS
  11. Chapter 11 — REFRIGERATION
  12. Chapter 12 — HYDRONICS
  13. ▸Chapter 13 — FUEL GAS PIPING
    Overview
    1. 1301.1 Applicability. The regulations of this chapter shall
    2. 1302.1 General. Coverage of piping systems shall extend
    3. 1302.2 Piping System Requirements. Requirements for
    4. 1302.3 Applications. This code shall not apply to the followin…
    5. 1303.1 Inspection Notification. Upon completion of the
    6. 1303.2 Excavation. Excavations required for the installation o…
    7. 1303.3 Type of Inspections. The Authority Having Jurisdiction …
    8. 1303.4 Inspection Waived. In cases where the work authorized b…
    9. 1304.1 Issuance. Whereupon final piping inspection, the
    10. 1304.2 Gas Supplier. A copy of the certificate of such final
    11. 1304.3 Unlawful. It shall be unlawful for a serving gas suppli…
    12. 1305.1 Authorized Personnel. It shall be unlawful for a
    13. 1305.2 Outlets. It shall be unlawful to turn on or connect gas
    14. 1306.1 Disconnection. The Authority Having Jurisdiction
    15. 1306.2 Notice. Where such disconnection has been made, a
    16. 1306.3 Capped Outlets. It shall be unlawful to remove or
    17. 1307.1 General. Where temporary use of gas is desired, and
    18. 1308.1 Installation of Piping System. Where required
    19. 1308.2 Provision for Location of Point of Delivery.
    20. 1308.3 Interconnections Between Gas Piping Sys-
    21. 1308.4 Sizing of Gas Piping Systems. Gas piping systems shall …
    22. 1308.5 Acceptable Piping Materials and Joining
    23. 1308.6 Gas Meters. Gas meters shall be selected for the
    24. 1308.7 Gas Pressure Regulators. A line pressure regulator shal…
    25. 1308.8 Overpressure Protection. Where the serving gas
    26. 1308.9 Pressure Limitation Requirements. Where piping systems …
    27. 1308.10 Overpressure Protection Devices. Overpressure protecti…
    28. 1308.11 Backpressure Protection. Protective devices
    29. 1308.12 Low-Pressure Protection. A protective device
    30. 1308.13 Shutoff Valves. Shutoff valves shall be approved
    31. 1308.14 Expansion and Flexibility. Piping systems shall
    32. 1309.1 General. Where automatic excess flow valves are
    33. 1310.1 Piping Underground. Underground gas piping shall
    34. 1310.2 CSST Piping Systems. CSST piping systems shall
    35. 1310.3 Installation of Aboveground Piping. Piping
    36. 1310.4 Concealed Piping in Buildings. Gas piping in
    37. 1310.5 Piping in Vertical Chases. Where gas piping
    38. 1310.6 Maximum Operating Pressure in Buildings.
    39. 1310.7 Appliance Overpressure Protection. The maximum operatin…
    40. 1310.8 Gas Pipe Turns. Changes in direction of gas pipe
    41. 1310.9 Drips and Sediment Traps. For other than dry gas
    42. 1310.10 Outlets. Outlets shall be located and installed in
    43. 1310.7 Appliance Overpressure Protection. The maxi- [NFPA 54:7…
    44. 1310.12 Prohibited Devices. Devices shall not be placed
    45. 1310.13 Systems Containing Gas-Air Mixtures Out-
    46. 1310.14 Systems Containing Flammable Gas-Air
    47. 1310.11 Manual Gas Shutoff Valves. An accessible gas
    48. 1311.1 Pipe and Tubing Other than CSST. Each aboveground porti…
    49. 1311.2 Bonding of CSST Gas Piping. CSST gas piping
    50. 1312.2 Suspended Low-Intensity Infrared Tube
    51. 1312.3 Use of Nonmetalic Gas Hose Connectors.
    52. 1311.3 Arc-Resistant Jacketed CSST. CSST listed with
    53. 1311.4 Prohibited Use. Gas piping shall not be used as a
    54. 1311.5 Lightning Protection System. Where a lightning
    55. 1311.6 Electrical Circuits. Electrical circuits shall not util…
    56. 1311.7 Electrical Connections. All electrical connections
    57. 1312.1 Connecting Appliances and Equipment.
    58. 1312.4 Injection (Bunsen) Burners. Injection (Bunsen)
    59. 1312.5 Connection of Portable and Mobile Industrial
    60. 1312.6 Appliance Shutoff Valves and Connections.
    61. 1312.7 Quick-Disconnect Devices. Quick-disconnect
    62. 1312.8 Gas Convenience Outlets. Appliances shall be
    63. 1312.9 Sediment Trap. Where a sediment trap is not incorporate…
    64. 1312.10 Installation of Piping. Piping shall be installed in
    65. 1312.11 Liquefied Petroleum Gas Facilities and Pip-
    66. 1313.1 Piping Installations. Prior to acceptance and initial o…
    67. 1313.2 Test Preparation. Test preparation shall comply
    68. 1313.3 Test Pressure. This inspection shall include an air,
    69. 1313.4 Detection of Leaks and Defects. The piping system shall…
    70. 1313.5 Piping System Leak Test. Leak checks using fuel
    71. 1313.6 Purging Requirements. The purging of piping
    72. 1314.1 General. The following regulations, shall comply
    73. 1314.2 Volume. The hourly volume of gas required at each
    74. 1314.3 Gas Appliances. Where the gas appliances to be
    75. 1314.4 Size of Piping Outlets. The size of the supply piping o…
    76. 1315.1 Pipe Sizing Methods. Where the pipe size is to be
    77. 1315.2 Sizing of Gas Piping Systems. Sizing of piping
    78. 1315.3 Sizing Equations. The inside diameter of smooth
    79. 1315.4 Sizing of Piping Sections. To determine the size
    80. 1315.5 Engineering Methods. For conditions other than
    81. 1315.6 Variable Gas Pressures. Where the supply gas
  14. Chapter 14 — PROCESS PIPING
  15. Chapter 15 — SOLAR ENERGY SYSTEMS
  16. Chapter 16 — STATIONARY POWER PLANTS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  19. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  20. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  21. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  22. Appendix E — SUSTAINABLE PRACTICES
  23. Appendix F — GEOTHERMAL ENERGY SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  25. Appendix H — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

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