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Chapter 12 — FUEL GAS PIPING

1208.10 Overpressure Protection Devices.

California Plumbing Code (Title 24, Part 5) · 2022 edition · updated 2026-09-10 · California

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

Overpressure protection devices shall be one of the following: (1) Pressure relief valve. (2) Monitor regulator. (3) Series regulator installed upstream from the line regula tor and set to continuously limit the pressure on the inlet of the line regulator to the maximum values specified by Section 1208.11 or less. (4) Automatic shutoff device installed in series with the line

pressure regulator and set to shut off when the pressure on the downstream piping system reaches the maximum values specified by Section 1208.11 or less. This device shall be designed so that it will remain closed until manually reset. [NFPA 54:5.9.3.1] 1208.10.1 Separate Devices. The devices in Section 1208.10 shall be installed either as an integral part of the service or line pressure regulator or as separate units. Where separate overpressure protection devices are installed, they shall comply with Section 1208.10.2 through Section 1208.10.7. [NFPA 54:5.9.3.2]

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2022 CALIFORNIA PLUMBING CODE 217

to 2 psi (14 kPa) or less upon a failure of the line pressure regulator. [NFPA 54:5.9.2.1]

1208.11.1 Overpressure Protection Required. Where piping systems serving appliances designed to operate with a gas supply pressure greater than 14 inches water column (3.5 kPa) are required to be equipped with overpressure protection by Section 1208.9, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance as required by the appliance manufacturer’s installation instructions.

[NFPA 54:5.9.2.2] 1208.11.2 Overpressure Protection Devices. Each overpressure protection device installed to meet the requirements of this section shall be capable of limiting the pressure to its connected appliance(s) as required by this section independently of any other pressure control equipment in the piping system. [NFPA 54:5.9.2.3] 1208.11.3 Detection of Failure. Each gas piping system for which an overpressure protection device is required by this section shall be designed and installed so that a failure of the primary pressure control device(s) is detectable. [NFPA 54:5.9.2.4] 1208.11.4 Flow Capacity. If a pressure relief valve is used to meet the requirements of this section, it shall have a flow capacity such that the pressure in the protected system is maintained at or below the limits specified in Section 1208.11 under the following conditions: (1) The line pressure regulator for which the relief valve

is providing overpressure protection has failed wide open. (2) The gas pressure at the inlet of the line pressure reg ulator for which the relief valve is providing overpressure protection is not less than the regulator’s normal operating inlet pressure. [NFPA 54:5.9.2.5]

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
  5. Chapter 5 — WATER HEATERS
  6. Chapter 6 — WATER SUPPLY AND DISTRIBUTION
  7. Chapter 7 — SANITARY DRAINAGE
  8. Chapter 8 — INDIRECT WASTES
  9. Chapter 9 — VENTS
  10. Chapter 10 — TRAPS AND INTERCEPTORS
  11. Chapter 11 — STORM DRAINAGE
  12. ▸Chapter 12 — FUEL GAS PIPING
    Overview
    1. 1201.1 Applicability. The regulations of this chapter shall
    2. 1202.1 General. Coverage of piping systems shall extend
    3. 1202.2 Piping System Requirements. Requirements for
    4. 1202.3 Applications. This code shall not apply to the followin…
    5. 1203.1 Inspection Notification. Upon completion of the
    6. 1203.2 Excavation. Excavations required for the installation o…
    7. 1203.3 Type of Inspections. The Authority Having Jurisdiction …
    8. 1203.4 Inspection Waived. In cases where the work
    9. 1204.1 Issuance. Whereupon final piping inspection, the
    10. 1204.2 Gas Supplier. A copy of the certificate of such final
    11. 1204.3 Unlawful. It shall be unlawful for a serving gas suppli…
    12. 1205.1 Authorized Personnel. It shall be unlawful for a
    13. 1205.2 Outlets. It shall be unlawful to turn on or connect gas
    14. 1206.1 Disconnection. The Authority Having Jurisdiction
    15. 1206.2 Notice. Where such disconnection has been made, a
    16. 1206.3 Capped Outlets. It shall be unlawful to remove or
    17. 1207.1 General. Where temporary use of gas is desired, and
    18. 1208.1 Installation of Piping System. Where required
    19. 1208.2 Provision for Location of Point of Delivery.
    20. 1208.3 Interconnections Between Gas Piping Sys-
    21. 1208.4 Sizing of Gas Piping Systems. Gas piping systems shall …
    22. 1208.5 Maximum Operating Pressure in Buildings.
    23. 1208.6 Acceptable Piping Materials and Joining
    24. 1208.7 Gas Meters. Gas meters shall be selected for the
    25. 1208.8 Gas Pressure Regulators. A line pressure regulator shal…
    26. 1208.9 Overpressure Protection Required. Where the
    27. 1208.10 Overpressure Protection Devices. Overpressure protecti…
    28. 1208.12 Backpressure Protection. Protective devices
    29. 1208.13 Low-Pressure Protection. A protective device
    30. 1208.11 Pressure Limitation Requirements. Where piping systems…
    31. 1208.14 Shutoff Valves. Shutoff valves shall be approved
    32. 1208.15 Expansion and Flexibility. Piping systems shall
    33. 1209.1 General. Where automatic excess flow valves are
    34. 1210.1 Piping Underground. Underground gas piping
    35. 1210.2 CSST Piping Systems. CSST piping systems shall
    36. 1210.3 Installation of Aboveground Piping. Piping
    37. 1210.5 Piping in Vertical Chases. Where gas piping
    38. 1210.4 Concealed Piping in Buildings. Gas piping in
    39. 1210.6 Gas Pipe Turns. Changes in direction of gas pipe
    40. 1210.7 Drips and Sediment Traps. For other than dry gas
    41. 1210.8 Outlets. Outlets shall be located and installed in
    42. 1210.9 Manual Gas Shutoff Valves. An accessible gas
    43. 1210.10 Prohibited Devices. Devices shall not be placed
    44. 1210.11 Systems Containing Gas-Air Mixtures Out-
    45. 1210.12 Systems Containing Flammable Gas-Air
    46. 1211.1 Pipe and Tubing Other than CSST. Each aboveground porti…
    47. 1211.2 Bonding of CSST Gas Piping. CSST gas piping
    48. 1211.3 Arc-Resistant Jacketed CSST. CSST listed with
    49. 1211.4 Prohibited Use. Gas piping shall not be used as a
    50. 1211.5 Lightning Protection System. Where a lightning
    51. 1211.6 Electrical Circuits. Electrical circuits shall not util…
    52. 1211.7 Electrical Connections. All electrical connections
    53. 1211.8 Earthquake-Actuated Gas Shutoff Valves. Earth-
    54. 1212.1 Connecting Appliances and Equipment.
    55. 1212.2 Suspended Low-Intensity Infrared Tube
    56. 1212.3 Use of Nonmetallic Gas Hose Connectors.
    57. 1212.4 Injection (Bunsen) Burners. Injection (Bunsen)
    58. 1212.5 Connection of Portable and Mobile Industrial
    59. 1212.6 Appliance Shutoff Valves and Connections.
    60. 1212.7 Quick-Disconnect Devices. Quick-disconnect
    61. 1212.8 Gas Convenience Outlets. Appliances shall be
    62. 1212.9 Sediment Trap. Where a sediment trap is not incorporate…
    63. 1212.10 Installation of Piping. Piping shall be installed in
    64. 1212.11 Liquefied Petroleum Gas Facilities and Pip-
    65. 1213.1 Piping Installations. Prior to acceptance and initial o…
    66. 1213.2 Test Preparation. Test preparation shall comply
    67. 1213.3 Test Pressure. This inspection shall include an air,
    68. 1213.4 Detection of Leaks and Defects. The piping system shall…
    69. 1213.5 Piping System Leak Test. Leak checks using fuel
    70. 1213.6 Purging Requirements. The purging of piping
    71. 1214.1 General. The following regulations shall comply
    72. 1214.2 Volume. The hourly volume of gas required at each
    73. 1214.3 Gas Appliances. Where the gas appliances to be
    74. 1214.4 Size of Piping Outlets. The size of the supply piping o…
    75. 1215.1 Pipe Sizing Methods. Where the pipe size is to be
    76. 1215.2 Sizing of Gas Piping Systems. Sizing of piping
    77. 1215.3 Sizing Equations. The inside diameter of smooth
    78. 1215.5 Engineering Methods. For conditions other than
    79. 1215.6 Variable Gas Pressure. Where the supply gas
    80. 1215.4 Sizing of Piping Sections. To determine the size
  13. Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
  14. Chapter 14 — FIRESTOP PROTECTION
  15. Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
  16. Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
  19. Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
  20. Appendix C — ALTERNATE PLUMBING SYSTEMS
  21. Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
  22. Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
  23. Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS
  25. Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
  26. Appendix I — INSTALLATION STANDARDS
  27. Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
  28. Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
  29. Appendix L — SUSTAINABLE PRACTICES
  30. Appendix M — PEAK WATER DEMAND CALCULATOR
  31. Appendix N — IMPACT OF WATER TEMPERATURE ON THE POTENTIAL FOR …

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