Section 5005 Use, Dispensing and Handling
Indoor dispensing and use areas shall be provided with exhaust ventilation in accordance with Section 5004.3.
Exception: Ventilation is not required for dispensing and use of flammable solids other than finely divided particles.
Liquids having a hazard ranking of 3 or 4 in accordance with NFPA 704 shall be transferred by one of the following methods:
- From safety cans complying with UL 30.
- Through an approved closed piping system.
- From containers or tanks by an approved pump taking suction through an opening in the top of the container or tank.
- From containers or tanks by gravity through an approved self-closing or automatic-closing valve where the container or tank and dispensing operations are provided with spill control and secondary containment in accordance with Section 5004.2. Highly toxic liquids shall not be dispensed by gravity from tanks.
Approved engineered liquid transfer systems.
Exceptions:
- Liquids having a hazard ranking of 4 where dispensed from approved containers not exceeding 1.3 gallons (5 L).
- Liquids having a hazard ranking of 3 where dispensed from approved containers not exceeding 5.3 gallons (20 L).
Where gases or liquids having a hazard ranking of Health Class 3 or 4, Flammability Class 4 or Instability Class 3 or 4 in accordance with NFPA 704 are carried in pressurized piping above 15 pounds per square inch gauge (psig) (103 kPa), an approved means of leak detection and emergency shutoff or excess flow control shall be provided. Where the piping originates from within a hazardous material storage room or area, the excess flow control shall be located within the storage room or area. Where the piping originates from a bulk source, the excess flow control shall be located as close to the bulk source as practical.
Exceptions:
- Piping for inlet connections designed to prevent backflow.
- Piping for pressure relief devices.
Where gases, liquids or solids having a hazard ranking of 3 or 4 in accordance with NFPA 704 are dispensed or used, mechanical exhaust ventilation shall be provided to capture gases, fumes, mists or vapors at the point of generation.
Exception: Gases, liquids or solids that can be demonstrated not to create harmful gases, fumes, mists or vapors.
Where required by Table 5005.2.1.4, buildings, rooms or areas where hazardous material liquids are dispensed or used in open systems shall be provided with secondary containment in accordance with Section 5004.2.2 where the capacity of an individual vessel or system or the capacity of multiple vessels or systems exceeds the following:
- Individual vessel or system: greater than 1.3 gallons (5 L).
- Multiple vessels or systems: greater than 5.3 gallons (20 L).
REQUIRED SECONDARY CONTAINMENT—HAZARDOUS MATERIAL LIQUIDS USE
| MATERIAL | INDOOR LIQUIDS USE | OUTDOOR LIQUIDS USE | |
| 1. Physical-hazard materials | |||
| Combustible liquids | Class II | See Chapter 57 | See Chapter 57 |
| Class IIIA | See Chapter 57 | See Chapter 57 | |
| Class IIIB | See Chapter 57 | See Chapter 57 | |
| Cryogenic fluids | See Chapter 55 | See Chapter 55 | |
| Explosives | See Chapter 56 | See Chapter 56 | |
| Flammable liquids | Class IA | See Chapter 57 | See Chapter 57 |
| Class IB | See Chapter 57 | See Chapter 57 | |
| Class IC | See Chapter 57 | See Chapter 57 | |
| Flammable solids | Not Applicable | Not Applicable | |
| Organic peroxides | Unclassified Detonable | Required | Required |
| Class I | Required | Required | |
| Class II | |||
| Class III | |||
| Class IV | |||
| Class V | Not Required | Not Required | |
| Oxidizers | Class 4 | Required | Required |
| Class 3 | |||
| Class 2 | |||
| Class 1 | |||
| Pyrophorics | Required | Required | |
| Unstable (reactives) | Class 4 | Required | Required |
| Class 3 | |||
| Class 2 | |||
| Class 1 | Not Required | Required | |
| Water reactives | Class 3 | Required | Required |
| Class 2 | |||
| Class 1 | Not Required | Required | |
| 2. Health-hazard materials | |||
| Corrosives | Required | Required | |
| Highly toxics | |||
| Toxics | |||
Explosion control shall be provided in accordance with Section 5004.6 where an explosive environment exists because of the hazardous materials dispensed or used, or as a result of the dispensing or use process.
Exception: Where process vessels are designed to contain fully the worst-case explosion anticipated within the vessel under process conditions based on the most likely failure.
Where required by Table 5005.2.1.4, buildings, rooms or areas where hazardous material liquids are used in vessels or systems shall be provided with secondary containment in accordance with Section 5004.2.2 where the capacity of an individual vessel or system or the capacity of multiple vessels or systems exceeds the following:
Where required by Table 5005.2.1.4, outdoor areas where hazardous material liquids are dispensed or used in open systems shall be provided with secondary containment in accordance with Section 5004.2.2 where the capacity of an individual vessel or system or the capacity of multiple vessels or systems exceeds the following:
Where required by Table 5005.2.1.4, outdoor areas where hazardous material liquids are dispensed or used in closed systems shall be provided with secondary containment in accordance with Section 5004.2.2 where the capacity of an individual vessel or system or the capacity of multiple vessels or systems exceeds the following:
Where overhead noncombustible construction is provided for sheltering outdoor hazardous material use areas, such use shall not be considered indoor use where the area is constructed in accordance with the requirements for weather protection as required in the International Building Code.
Exception: Use of explosive materials shall be considered as indoor use.