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Chapter 12 — FUEL GAS PIPING

1215.3 Sizing Equations.

California Plumbing Code (Title 24, Part 5) · 2019 edition · updated 2026-09-10 · California

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

The inside diameter of smoothwall pipe or tubing shall be determined by Equation 1215.3(1), Equation 1215.3(2), Table 1215.3 and using the equivalent pipe length determined by the methods in Section 1215.1.1 through Section 1215.1.3. [NFPA 54:6.4]

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1213.6.3 Purging Appliances and Equipment. After the piping system has been placed in operation, appliances and equipment shall be purged before being placed into operation. [NFPA 54:8.3.3]

1215.1.1 Longest Length Method. The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section (see calculation example in Figure 1215.1.1). [NFPA 54:6.1.1] 1215.1.2 Branch Length Method. Pipe shall be sized as follows: (1) The pipe size of each section of the longest pipe run

from the point of delivery to the most remote outlet

(1) The pipe size of each section of the longest pipe run

from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section. (2) The pipe size of each section of branch piping not

previously sized shall be determined using the

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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. 1201.0 General.1201.1 Applicability. The regulations of this c…
    2. 1202.0 Coverage of Piping System.1202.1 General. Coverage of p…
    3. 1202.2 Piping System Requirements. Requirements for
    4. 1202.3 Applications. This code shall not apply to the followin…
    5. 1203.2 Excavation. Excavations required for the installation o…
    6. 1203.3 Type of Inspections. The Authority Having Jurisdiction …
    7. 1203.4 Inspection Waived. In cases where the work
    8. 1204.2 Gas Supplier. A copy of the certificate of such final
    9. 1204.3 Unlawful. It shall be unlawful for a serving gas suppli…
    10. 1205.2 Outlets. It shall be unlawful to turn on or connect gas
    11. 1206.2 Notice. Where such disconnection has been made, a
    12. 1206.3 Capped Outlets. It shall be unlawful to remove or
    13. 1208.0 Gas Piping System Design, Materials, and
    14. 1208.2 Provision for Location of Point of Delivery. The locati…
    15. 1208.3 Interconnections Between Gas Piping Sys-tems. Where two…
    16. 1208.4 Sizing of Gas Piping Systems. Gas piping systems shall …
    17. 1208.5 Maximum Design Operating Pressure. The
    18. 1208.6 Acceptable Piping Materials and JoiningMethods. Materia…
    19. 1208.7 Gas Meters. Gas meters shall be selected for the
    20. 1208.8 Gas Pressure Regulators. A line pressure regulator or g…
    21. 1208.9 Overpressure Protection Devices. Where the
    22. 1208.10 Pressure Limitation Requirements. Where
    23. 1208.11 Backpressure Protection. Protective devices
    24. 1208.12 Low-Pressure Protection. A protective device
    25. 1208.13 Shutoff Valves. Shutoff valves shall be approved
    26. 1208.14 Expansion and Flexibility. Piping systems shall
    27. 1210.0 Gas Piping Installation.1210.1 Piping Underground. Unde…
    28. 1210.2 Installation of Piping. Piping installed aboveground sh…
    29. 1210.3 Concealed Piping in Buildings. Gas piping in
    30. 1210.4 Piping in Vertical Chases. Where gas piping
    31. 1210.6 Drips and Sediment Traps. For other than dry gas
    32. 1210.7 Outlets. Outlets shall be located and installed in
    33. 1210.5 Gas Pipe Turns. Changes in direction of gas pipe
    34. 1210.10 Prohibited Devices. No device shall be placed
    35. 1210.11 Systems Containing Gas-Air Mixtures Out-side the Flamm…
    36. 1210.12 Systems Containing Flammable Gas-AirMixtures. Systems …
    37. 1210.8 Branch Pipe Connection. Where a branch outlet
    38. 1210.9 Manual Gas Shutoff Valves. An accessible gas
    39. 1211.2 Bonding of CSST Gas Piping. CSST gas piping
    40. 1211.3 Prohibited Use. Gas piping shall not be used as a
    41. 1211.4 Lightning Protection System. Where a lightning
    42. 1211.5 Electrical Circuits. Electrical circuits shall not util…
    43. 1211.6 Electrical Connections. All electrical connections
    44. 1211.7 Earthquake-Actuated Gas Shutoff Valves. Earth-
    45. 1212.2 Suspended Low-Intensity Infrared TubeHeaters. Suspended…
    46. 1212.3 Use of Nonmetallic Gas Hose Connectors. Listed gas hose…
    47. 1212.1 Connecting Appliances and Equipment.
    48. 1212.4 Injection (Bunsen) Burners. Injection (Bunsen)
    49. 1212.5 Connection of Portable and Mobile Industrial
    50. 1212.5 Connection of Portable and Mobile Industrial
    51. 1212.9 Sediment Trap. Where a sediment trap is not incorporate…
    52. 1212.6 Appliance Shutoff Valves and Connections.
    53. 1212.7 Quick-Disconnect Devices. Quick-disconnect
    54. 1212.8 Gas Convenience Outlets. Appliances shall be
    55. 1212.10 Installation of Piping. Piping shall be installed in
    56. 1212.11 Liquefied Petroleum Gas Facilities and Pip-
    57. 1213.0 Pressure Testing, Inspection, and Purging.1213.1 Piping…
    58. 1213.2 Test Preparation. Test preparation shall comply
    59. 1213.3 Test Pressure. This inspection shall include an air,
    60. 1213.4 Detection of Leaks and Defects. The piping system shall…
    61. 1213.5 Piping System Leak Test. Leak checks using fuel
    62. 1213.6 Purging Requirements. The purging of piping
    63. 1215.2 Tables for Sizing Gas Piping Systems. Table
    64. 1215.3 Sizing Equations. The inside diameter of smoothwall pip…
    65. 1214.2 Volume. The hourly volume of gas required at each
    66. 1214.3 Gas Appliances. Where the gas appliances to be
    67. 1214.4 Size of Piping Outlets. The size of the supply piping o…
    68. 1215.0 Required Gas Piping Size.1215.1 Pipe Sizing Methods. Wh…
    69. 1215.5 Engineering Methods. For conditions other than
    70. 1215.6 Variable Gas Pressure. Where the supply gas
    71. 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 STANDARD FOR PEX TUBING SYSTEMS FOR …
  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

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