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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) · 2019 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]

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Systems.1308.5.9.4 Liquefied Petroleum Gas Piping Plastic piping joints and fittings for use in LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.6.9(4)] 1308.5.10 Flange Specification. Cast iron flanges shall be in accordance with ASME B16.1. [NFPA 54:5.6.10.1.1] 1308.5.10.1 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] 1308.5.10.2 Non-Ferrous Flanges. Non-ferrous flanges shall be in accordance with ASME B16.24.

[NFPA 54:5.6.10.1.3] 1308.5.10.3 Ductile Iron Flanges. Ductile iron flanges shall be in accordance with ASME B16.42.

[NFPA 54:5.6.10.1.4] Raised-face flanges shall not be joined to flat-faced 1308.5.10.4 Dissimilar Flange Connections. cast iron, ductile iron or nonferrous material flanges.

[NFPA 54:5.6.10.2] 1308.5.10.5 Flange Facings. Standard facings shall be permitted for use under this code. Where 150 psi (1034 kPa) steel flanges are bolted to Class 125 cast-iron flanges, the raised face on the steel flange shall be removed. [NFPA 54:5.6.10.3] 1308.5.10.6 Lapped Flanges. Lapped flanges shall be used only aboveground or in exposed locations accessible for inspection. [NFPA 54:5.6.10.4] 1308.5.11 Flange Gaskets. The material for gaskets shall be capable of withstanding the design temperature and pressure of the piping system and the chemical constituents of the gas being conducted without change to its chemical and physical properties. The effects of fire exposure to the joint shall be considered in choosing the material. [NFPA 54:5.6.11]

1308.5.11.1 Flange Gasket Materials. Acceptable materials shall include the following: (a) Metal (plain or corrugated) (b) Composition (c) Aluminum “O” rings (d) Spiral-wound metal gaskets (e) Rubber-faced phenolic (f) Elastomeric [NFPA 54:5.6.11.1] 1308.5.11.2 Metallic Flange Gaskets. Metallic flange gaskets shall be in accordance with ASME B16.20. [NFPA 54:5.6.11.2.1] Non-metallic flange gaskets shall be in accordance 1308.5.11.3 Non-Metallic Flange Gaskets. with ASME B16.21. [NFPA 54:5.6.11.2.2] 1308.5.11.4 Full-Face Flange Gasket. Full-face flange gaskets shall be used with all non-steel flanges. [NFPA 54:5.6.11.3]

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.

s 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] 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. 1301.0 Scope of Gas Piping. The regulati…
    2. 1302.1 General. 1302.0 Coverage of Piping System. Coverage of …
    3. 1302.2 Piping System Requirements. Requirements for
    4. 1302.3 Applications. This code shall not apply to the followin…
    5. 1303.2 Excavation. Excavations required for the installation o…
    6. 1303.3 Type of Inspections. The Authority Having Jurisdiction …
    7. 1303.4 Inspection Waived. In cases where the work
    8. 1304.1 Issuance. 1304.0 Certificate of Inspection. Where upon …
    9. 1304.2 Gas Supplier. A copy of the certificate of such final
    10. 1304.3 Unlawful. It shall be unlawful for a serving gas suppli…
    11. 1305.1 Authorized Personnel.1305.0 Authority to Render Gas Ser…
    12. 1305.2 Outlets. It shall be unlawful to turn on or connect gas
    13. 1306.2 Notice. Where such disconnection has been made, a
    14. 1306.3 Capped Outlets. It shall be unlawful to remove or
    15. 1308.1 Installation of Piping System.Components. Where required
    16. 1308.2 Provision for Location of Point of Delivery.
    17. 1308.3 Interconnections Between Gas Piping Sys-
    18. 1308.4 Sizing of Gas Piping Systems. Gas piping systems shall …
    19. 1308.6 Gas Meters. Gas meters shall be selected for the
    20. 1308.7 Gas Pressure Regulators. A line pressure regulator or g…
    21. 1308.9 Pressure Limitation Requirements. Where piping systems …
    22. 1308.10 Backpressure Protection. Protective devices
    23. 1308.10 Backpressure Protection. Protective devices
    24. 1308.8 Overpressure Protection. Where the serving gas
    25. 1308.11 Low-Pressure Protection. A protective device
    26. 1308.12 Shutoff Valves. Shutoff valves shall be approved
    27. 1308.13 Expansion and Flexibility. Piping systems shall
    28. 1309.1 General.1309.0 Excess Flow Valve. Where automatic exces…
    29. 1310.1 Piping Underground. 1310.0 Gas Piping Installation. Und…
    30. 1310.2 Installation of Piping. Piping installed aboveground sh…
    31. 1310.3 Concealed Piping in Buildings. Gas piping in
    32. 1310.4 Piping in Vertical Chases. Where gas piping
    33. 1310.6 Appliance Overpressure Protection. The maximum operatin…
    34. 1310.7 Gas Pipe Turns. Changes in direction of gas pipe
    35. 1310.5 Maximum Design Operating Pressure. The
    36. 1310.8 Drips and Sediment Traps. For other than dry gas
    37. 1310.9 Outlets. Outlets shall be located and installed in
    38. 1310.10 Branch Pipe Connection. When a branch outlet
    39. 1310.11 Manual Gas Shutoff Valves. An accessible gas
    40. 1310.12 Prohibited Devices. No device shall be placed
    41. 1312.1 Connecting Appliances and Equipment.
    42. 1311.4 Lightning Protection System. Where a lightning
    43. 1311.5 Electrical Circuits. Electrical circuits shall not util…
    44. 1311.6 Electrical Connections. All electrical connections
    45. 1311.1 Pipe and Tubing Other than CSST. 1311.0 Electrical Bond…
    46. 1311.2 Bonding of CSST Gas Piping. CSST gas piping
    47. 1311.3 Grounding Conductor of Electrode. Gas piping
    48. 1312.2 Suspended Low-Intensity Infrared Tube
    49. 1312.3 Use of Gas Hose Connectors. Listed gas hose
    50. 1312.7 Quick-Disconnect Devices. Quick-disconnect
    51. 1312.8 Gas Convenience Outlets. Appliances shall be
    52. 1312.4 Injection (Bunsen) Burners. Injection (Bunsen)
    53. 1312.9 Sediment Trap. Where a sediment trap is not incorporate…
    54. 1313.2 Test Preparation. Test preparation shall comply
    55. 1313.3 Test Pressure. This inspection shall include an air,
    56. 1312.10 Installation of Piping. Piping shall be installed in
    57. 1313.1 Piping Installations. 1313.0 Pressure Testing and Inspe…
    58. 1313.4 Detection of Leaks and Defects. The piping system shall…
    59. 1313.5 Piping System Leak Test. Leak checks using fuel
    60. 1313.6 Purging Requirements. The purging of piping
    61. 1314.0 Required Gas Supply. 1314.1 General. The following regu…
    62. 1314.2 Volume. The hourly volume of gas required at each
    63. 1314.3 Gas Appliances. Where the gas appliances to be
    64. 1314.4 Size of Piping Outlets. The size of the supply piping o…
    65. 1315.0 Required Gas Piping Size.1315.1 Pipe Sizing Methods. Wh…
    66. 1315.2 Tables for Sizing Gas Piping Systems. Table
    67. 1315.3 Sizing Equations. The inside diameter of smooth
    68. 1315.4 Sizing of Piping Sections. To determine the size
    69. 1315.5 Engineering Methods. For conditions other than
    70. 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 — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  24. Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

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