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Earlier editions: 20222019

Chapter 13 — FUEL GAS PIPING

1310.8 Gas Pipe Turns. Changes in direction of gas pipe

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-10 · California

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

shall be made by the use of fittings, factory bends, or field bends. [NFPA 54:7.5]

1310.8.1 Metallic Pipe. Metallic pipe bends shall comply with the following:

(1) Bends shall be made only with bending tools and procedures intended for that purpose.

286 2025 CALIFORNIA MECHANICAL CODE

FUEL GAS PIPING

(2) All bends shall be smooth and free from buckling, cracks, or other evidence of mechanical damage.

(3) The longitudinal weld of the pipe shall be near the neutral axis of the bend.

(4) Pipe shall not be bent through an arc of more than 90 degrees.

(5) The inside radius of a bend shall be not less than 6 times the outside diameter of the pipe. [NFPA 54:7.5.1]

1310.8.2 Plastic Pipe. Plastic pipe bends shall comply with the following:

(1) The pipe shall not be damaged, and the internal diameter of the pipe shall not be effectively reduced.

(2) Joints shall not be located in pipe bends.

(3) The radius of the inner curve of such bends shall not be less than 25 times the inside diameter of the pipe.

(4) Where the piping manufacturer specifies the use of special bending tools or procedures, such tools or procedures shall be used. [NFPA 54:7.5.2]

1310.8.3 Elbows. Factory-made welding elbows or transverse segments cut therefrom shall have an arc length measured along the crotch of at least 1 inch (25 mm) for pipe sizes 2 inches (50 mm) and larger. [NFPA 54:7.5.3]

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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 chapter shall not apply to the
    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 Interconnections Supplying Separate Users.
    20. 1308.3 Sizing of Gas Piping Systems. Gas piping systems shall …
    21. 1308.4 Acceptable Piping Materials and Joining
    22. 1308.5 Gas Meters. Gas meters shall be selected for the
    23. 1308.6 Gas Pressure Regulators. A line pressure regulator shal…
    24. 1308.7 Overpressure Protection. Where the serving gas
    25. 1308.8 Pressure Limitation Requirements. Where piping systems …
    26. 1308.9 Overpressure Protection Devices. Overpressure protectio…
    27. 1308.13 Expansion and Flexibility. Piping systems shall
    28. 1308.14 Pressure Regulator and Pressure Control
    29. 1308.10 Backpressure Protection. Protective devices
    30. 1308.11 Low-Pressure Protection. A protective device
    31. 1308.12 Shutoff Valves. Shutoff valves shall be selected in
    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. 1310.11 Manual Gas Shutoff Valves. An accessible gas
    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. 1311.1 Pipe and Tubing Other than CSST. Each aboveground porti…
    48. 1311.2 Bonding of CSST Gas Piping. CSST gas piping
    49. 1311.3 Arc-Resistant Jacketed CSST. CSST listed with
    50. 1311.4 Prohibited Use. Gas piping shall not be used as a
    51. 1311.5 Lightning Protection System. Where a lightning
    52. 1311.6 Electrical Circuits. Electrical circuits shall not util…
    53. 1311.7 Electrical Connections. All electrical connections
    54. 1312.1 Connecting Appliances and Equipment.
    55. 1312.3 Use of Nonmetallic Gas Hose Connectors.
    56. 1312.4 Injection (Bunsen) Burners. Injection (Bunsen)
    57. 1312.5 Connection of Portable and Mobile Industrial
    58. 1312.2 Suspended Low-Intensity Infrared Tube
    59. 1312.6 Appliance Shutoff Valves and Connections.
    60. 1312.7 Quick-Disconnect Devices. Quick-disconnect
    61. 1312.8 Gas Convenience Outlets. Appliances shall be
    62. 1312.9 Sediment Trap. Where a sediment trap is not incorporate…
    63. 1312.10 Installation of Piping. Piping shall be installed in
    64. 1312.11 Liquefied Petroleum Gas (LP-Gas) Facilities
    65. 1313.1 Piping Installations. Prior to acceptance and initial o…
    66. 1313.2 Test Preparation. Test preparation shall comply
    67. 1313.3 Test Pressure. This inspection shall include an air,
    68. 1313.4 Detection of Leaks and Defects. The piping system shall…
    69. 1313.5 Piping System Leak Test. Leak checks using fuel
    70. 1313.6 Purging Requirements. The purging of piping
    71. 1314.1 General. The following regulations, shall comply
    72. 1314.2 Volume. The hourly volume of gas required at each
    73. 1314.3 Gas Appliances. Where the gas appliances to be
    74. 1314.4 Size of Piping Outlets. The size of the supply piping o…
    75. 1315.1 Pipe Sizing Methods. Where the pipe size is to be
    76. 1315.2 Sizing of Gas Piping Systems. Sizing of piping
    77. 1315.3 Sizing Equations. The inside diameter of smooth
    78. 1315.4 Sizing of Piping Sections. To determine the size
    79. 1315.5 Engineering Methods. For conditions other than
    80. 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 — GEOTHERMAL ENERGY SYSTEMS AND AMBIENT TEMPERATURE…
  18. Chapter 18 — REFERENCED STANDARDS
  19. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  20. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  21. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  22. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  23. Appendix E — SUSTAINABLE PRACTICES
  24. Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  25. Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE
  26. Appendix H — PROFESSIONAL QUALIFICATIONS
  27. Appendix I — INDOOR HORTICULTURAL FACILITIES
  28. Appendix J — CLEAN AIR DELIVERY

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