Vessels used for mixing or blending of Class I liquids and Class II or III liquids heated up to or above their flash points shall be provided with self-closing, tight-fitting, noncombustible lids that will control a fire within such vessel.
Exception: Where such devices are impractical, approved automatic or manually controlled fire-extinguishing devices shall be provided.
Processing vessels shall be located with respect to distances to lot lines of adjoining property that can be built on, in accordance with Tables 5705.3.4(1) and 5705.3.4(2).
Exception: Where the exterior wall facing the adjoining lot line is a blank wall having a fire-resistance rating of not less than 4 hours, the fire code official is authorized to modify the distances. The distance shall be not less than that set forth in the California Building Code, and where Class IA or unstable liquids are involved, explosion control shall be provided in accordance with Section 911.
| PROCESSING VESSELS WITH EMERGENCY RELIEF VENTING | LOCATIONa | |
| Stable liquids | Unstable liquids | |
| Not in excess of 2.5 psig | Table 5705.3.4(2) | 2.5 times Table 5705.3.4(2) |
| Over 2.5 psig | 1.5 times Table 5705.3.4(2) | 4 times Table 5705.3.4(2) |
For SI: 1 pound per square inch gauge = 6.895 kPa.
- Where protection of exposures by a public fire department or private fire brigade capable of providing cooling water streams on structures is not provided, distances shall be doubled.
REFERENCE TABLE FOR USE WITH TABLE 5705.3.4(1)
| TANK CAPACITY (gallons) | MINIMUM DISTANCE FROM LOT LINE OF A LOT WHICH IS OR CAN BE BUILT UPON, INCLUDING THE OPPOSITE SIDE OF A PUBLIC WAY (feet) | MINIMUM DISTANCE FROM NEAREST SIDE OF ANY PUBLIC WAY OR FROM NEAREST IMPORTANT BUILDING ON THE SAME PROPERTY (feet) |
| 275 or less | 5 | 5 |
| 276 to 750 | 10 | 5 |
| 751 to 12,000 | 15 | 5 |
| 12,001 to 30,000 | 20 | 5 |
| 30,001 to 50,000 | 30 | 10 |
| 50,001 to 100,000 | 50 | 15 |
| 100,001 to 500,000 | 80 | 25 |
| 500,001 to 1,000,000 | 100 | 35 |
| 1,000,001 to 2,000,000 | 135 | 45 |
| 2,000,001 to 3,000,000 | 165 | 55 |
| 3,000,001 or more | 175 | 60 |
For SI: 1 foot = 304.8 mm, 1 gallon = 3.785 L.
Indoor use, dispensing and mixing of flammable and combustible liquids shall not exceed the maximum allowable quantity per control area indicated in Table 5003.1.1(1) and shall not exceed the additional limitations set forth in Section 5705.3.5.
Exception: Cleaning with Class I, II and IIIA liquids shall be in accordance with Section 5705.3.6.
Use of hazardous production material flammable and combustible liquids in Group H-5 occupancies shall be in accordance with Chapter 27.
The following limits for quantities of flammable and combustible liquids used, dispensed or mixed based on occupancy classification shall not be exceeded:
Exception: Cleaning with Class I, II, or IIIA liquids shall be in accordance with Section 5705.3.6.
- Group A occupancies: Quantities in Group A occupancies shall not exceed that necessary for demonstration, treatment, laboratory work, maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group B occupancies: Quantities in drinking, dining, office and school uses within Group B occupancies shall not exceed that necessary for demonstration, treatment, laboratory work, maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group E occupancies: Quantities in Group E occupancies shall not exceed that necessary for demonstration, treatment, laboratory work, maintenance purposes and operation of equipment and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group F occupancies: Quantities in dining, office and school uses within Group F occupancies shall not exceed that necessary for demonstration, laboratory work, maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group I occupancies: Quantities in Group I occupancies shall not exceed that necessary for demonstration, laboratory work, maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group M occupancies: Quantities in dining, office and school uses within Group M occupancies shall not exceed that necessary for demonstration, laboratory work, maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group R occupancies: Quantities in Group R occupancies shall not exceed that necessary for maintenance purposes and operation of equipment, and shall not exceed quantities set forth in Table 5003.1.1(1).
- Group S occupancies: Quantities in dining and office uses within Group S occupancies shall not exceed that necessary for demonstration, laboratory work, maintenance purposes and operation of equipment and shall not exceed quantities set forth in Table 5003.1.1(1).
Quantities exceeding the maximum allowable quantity per control area indicated in Sections 5705.3.5.1 and 5705.3.5.2 shall be in accordance with the following:
- For open systems, indoor use, dispensing and mixing of flammable and combustible liquids shall be within a room or building complying with the California Building Code and Sections 5705.3.7.1 through 5705.3.7.5.
- For closed systems, indoor use, dispensing and mixing of flammable and combustible liquids shall be within a room or building complying with the California Building Code and Sections 5705.3.7 through 5705.3.7.4 and Section 5705.3.7.6.
Cleaning with Class I, II and IIIA liquids shall be in accordance with Sections 5705.3.6.1 through 5705.3.6.2.7.
Exceptions:
- Dry cleaning shall be in accordance with Chapter 21.
- Spray-nozzle cleaning shall be in accordance with Section 2403.3.5.
Class IA liquids shall not be used for cleaning. Cleaning with Class IB, IC or II liquids shall be conducted as follows:
- In a room or building in accordance with Section 5705.3.7; or
- In a parts cleaner listed, labeled and approved for the purpose in accordance with Section 5705.3.6.2.
Exception: Materials used in commercial and industrial process-related cleaning operations in accordance with other provisions of this code and not involving facilities maintenance cleaning operations.
Solvent quantities shall be limited as follows:
- Machines without remote solvent reservoirs shall be limited to quantities set forth in Section 5705.3.5.
- Machines with remote solvent reservoirs using Class I liquids shall be limited to quantities set forth in Section 5705.3.5.
- Machines with remote solvent reservoirs using Class II liquids shall be limited to 35 gallons (132 L) per machine. The total quantities shall not exceed an aggregate of 240 gallons (908 L) per control area in buildings not equipped throughout with an approved automatic sprinkler system and an aggregate of 480 gallons (1817 L) per control area in buildings equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1.
- Machines with remote solvent reservoirs using Class IIIA liquids shall be limited to 80 gallons (303 L) per machine.
Continuous mechanical ventilation shall be provided at a rate of not less than 1 cfm per square foot [0.00508 m3/(s • m2)] of floor area over the design area. Provisions shall be made for introduction of makeup air in such a manner to include all floor areas or pits where vapors can collect. Local or spot ventilation shall be provided where needed to prevent the accumulation of hazardous vapors. Ventilation system design shall comply with the California Building Code and California Mechanical Code.
Exception: Where natural ventilation can be shown to be effective for the materials used, dispensed or mixed.
Explosion control shall be provided where an explosive environment can occur as a result of the mixing or use process. Explosion control shall be designed in accordance with Section 911.
Exception: Where process vessels are designed to contain fully the worst-case explosion anticipated within the vessel under process conditions considering the most likely failure.
Outside use, dispensing and handling shall be in accordance with Sections 5705.3.8.1 through 5705.3.8.4.
Dispensing of liquids into motor vehicle fuel tanks at motor fuel-dispensing facilities shall be in accordance with Chapter 23.