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Chapter 29 — MANUFACTURE OF ORGANIC COATINGS

Section 2906 — PROCESS MILLS AND KETTLES

2025 California Fire Code (Title 24, Part 9) · 2025 edition · updated 2026-07-29 · California

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

2906.1 Mills.

Mills, operating with close clearances, which process flammable and heat-sensitive materials, such as nitrocellulose, shall be located in a detached building or in a noncombustible structure without other occupancies. The amount of nitrocellulose or other flammable material brought into the area shall not be more than the amount required for a batch.

2906.2 Mixers.

Mixers shall be of the enclosed type or, where of the open type, shall be provided with properly fitted covers. Where flow is by gravity, a shutoff valve shall be installed as close as practical to the mixer, and a control valve shall be provided near the end of the fill pipe.

2906.3 Open kettles.

Open kettles shall be located in an outside area provided with a protective roof; in a separate structure of noncombustible construction; or separated from other areas by a noncombustible wall having a fire-resistance rating of not less than 2 hours.

2906.4 Closed kettles.

Contact-heated kettles containing solvents shall be equipped with safety devices that, in case of a fire, will turn off the process heat, turn on the cooling medium and inject inert gas into the kettle.

2906.4.1 Vaporizer location. The vaporizer section of heat-transfer systems that heat closed kettles containing solvents shall be remotely located.

2906.5 Kettle controls.

The kettle and thin-down tank shall be instrumented, controlled and interlocked so that any failure of the controls will result in a safe condition. The kettle shall be provided with a pressure-rupture disc in addition to the primary vent. The vent piping from the rupture disc shall be of minimum length and shall discharge to an approved location. The thin-down tank shall be adequately vented. Thinning operations shall be provided with an adequate vapor removal system.

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▸ Contents — 2025 California Fire Code (Title 24, Part 9)
2025 California Fire Code (Title 24, Part 9)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REQUIREMENTS
  4. Chapter 4 — EMERGENCY PLANNING AND PREPAREDNESS
  5. Chapter 5 — FIRE SERVICE FEATURES
  6. Chapter 6 — BUILDING SERVICES AND SYSTEMS
  7. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  8. Chapter 8 — INTERIOR FINISH, DECORATIVE MATERIALS AND FURNISHI…
  9. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  10. Chapter 10 — MEANS OF EGRESS
  11. Chapter 11 — CONSTRUCTION REQUIREMENTS FOR EXISTING BUILDINGS
  12. Chapter 12 — ENERGY SYSTEMS
  13. Chapter 20 — AVIATION FACILITIES
  14. Chapter 21 — DRY CLEANING
  15. Chapter 22 — COMBUSTIBLE DUST-PRODUCING OPERATIONS
  16. Chapter 23 — MOTOR FUEL-DISPENSING FACILITIES AND REPAIR GARAGES
  17. Chapter 24 — FLAMMABLE FINISHES
  18. Chapter 25 — FRUIT AND CROP RIPENING
  19. Chapter 26 — FUMIGATION AND INSECTICIDAL FOGGING
  20. Chapter 27 — SEMICONDUCTOR FABRICATION FACILITIES
  21. Chapter 28 — LUMBER YARDS AND AGRO-INDUSTRIAL, SOLID BIOMASS A…
  22. ▸ Chapter 29 — MANUFACTURE OF ORGANIC COATINGS
    Overview
    1. Section 2901 — GENERAL
    2. Section 2902 — DEFINITION
    3. Section 2903 — GENERAL PRECAUTIONS
    4. Section 2904 — ELECTRICAL EQUIPMENT AND PROTECTION
    5. Section 2905 — PROCESS STRUCTURES
    6. Section 2906 — PROCESS MILLS AND KETTLES
    7. Section 2907 — PROCESS PIPING
    8. Section 2908 — RAW MATERIALS IN PROCESS AREAS
    9. Section 2909 — RAW MATERIALS AND FINISHED PRODUCTS
  23. Chapter 30 — INDUSTRIAL OVENS
  24. Chapter 31 — TENTS, TEMPORARY SPECIAL EVENT STRUCTURES AND OTH…
  25. Chapter 32 — HIGH-PILED COMBUSTIBLE STORAGE
  26. Chapter 33 — FIRE SAFETY DURING CONSTRUCTION AND DEMOLITION
  27. Chapter 34 — TIRE REBUILDING AND TIRE STORAGE
  28. Chapter 35 — WELDING AND OTHER HOT WORK
  29. Chapter 36 — MARINAS
  30. Chapter 37 — COMBUSTIBLE FIBERS
  31. Chapter 38 — RESERVED
  32. Chapter 39 — PROCESSING AND EXTRACTION FACILITIES
  33. Chapter 40 — STORAGE OF DISTILLED SPIRITS AND WINES
  34. Chapter 41 — TEMPORARY HEATING AND COOKING OPERATIONS
  35. Chapter 48 — MOTION PICTURE AND TELEVISION PRODUCTION STUDIO S…
  36. Chapter 49 — REQUIREMENTS FOR WILDLAND-URBAN INTERFACE FIRE AR…
  37. Chapter 50 — HAZARDOUS MATERIALS—GENERAL PROVISIONS
  38. Chapter 51 — AEROSOLS
  39. Chapter 52 — RESERVED
  40. Chapter 53 — COMPRESSED GASES
  41. Chapter 54 — CORROSIVE MATERIALS
  42. Chapter 55 — CRYOGENIC FLUIDS
  43. Chapter 56 — EXPLOSIVES AND FIREWORKS
  44. Chapter 57 — FLAMMABLE AND COMBUSTIBLE LIQUIDS
  45. Chapter 58 — FLAMMABLE GASES AND FLAMMABLE CRYOGENIC FLUIDS
  46. Chapter 59 — FLAMMABLE SOLIDS
  47. Chapter 60 — HIGHLY TOXIC AND TOXIC MATERIALS
  48. Chapter 61 — LIQUEFIED PETROLEUM GASES
  49. Chapter 62 — ORGANIC PEROXIDES
  50. Chapter 63 — OXIDIZERS, OXIDIZING GASES AND OXIDIZING CRYOGENI…
  51. Chapter 64 — PYROPHORIC MATERIALS
  52. Chapter 65 — PYROXYLIN (CELLULOSE NITRATE) PLASTICS
  53. Chapter 66 — UNSTABLE (REACTIVE) MATERIALS
  54. Chapter 67 — WATER-REACTIVE SOLIDS AND LIQUIDS
  55. Chapter 80 — REFERENCED STANDARDS
  56. Appendix Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON US…
  57. Appendix A — BOARD OF APPEALS
  58. Appendix B — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
  59. Appendix BB — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
  60. Appendix C — FIRE HYDRANT LOCATIONS AND DISTRIBUTION
  61. Appendix CC — FIRE HYDRANT LOCATIONS AND DISTRIBUTION
  62. Appendix D — FIRE APPARATUS ACCESS ROADS
  63. Appendix E — HAZARD CATEGORIES
  64. Appendix F — HAZARD RANKING
  65. Appendix G — CRYOGENIC FLUIDS—WEIGHT AND VOLUME EQUIVALENTS
  66. Appendix H — HAZARDOUS MATERIALS MANAGEMENT PLANS AND HAZARDOU…
  67. Appendix I — FIRE PROTECTION SYSTEMS—NONCOMPLIANT CONDITIONS
  68. Appendix J — BUILDING INFORMATION SIGN
  69. Appendix K — CONSTRUCTION REQUIREMENTS FOR EXISTING AMBULATORY…
  70. Appendix L — REQUIREMENTS FOR FIREFIGHTER AIR REPLENISHMENT SY…
  71. Appendix M — HIGH-RISE BUILDINGS—RETROACTIVE AUTOMATIC SPRINKL…
  72. Appendix N — INDOOR TRADE SHOWS AND EXHIBITIONS
  73. Appendix O — VALET TRASH AND RECYCLING COLLECTION IN GROUP R-2…
  74. Appendix P — TEMPORARY HAUNTED HOUSES, GHOST WALKS AND SIMILAR…
  75. Appendix Q — COMMUNITY WILDLAND-URBAN INTERFACE (WUI) FIRE HAZ…

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