Hazard Class Requirements Matrix
Follow safety requirements for the hazard class of your material.
Requirements for safe use of a hazardous gas are determined by the hazard class of the gas.
- Determine the Classification & Requirements of your material.
- Then follow the appropriate requirements below.
Click on the requirement for a full description.
| Requirements | Class IV | Class III | Class II | Class I |
|---|---|---|---|---|
| Exhausted enclosures (gas cabinets or fume hoods) | C1 | X | X | |
| X | X | X | ||
| Leak check (of installed system) | X | X | X | |
| Emergency response plan, team, and drills | X | X | X | |
| Flow-limiting device or flow-restricting orifice | C1 | X | X | |
| Use in sprinkled spaces | X | X | X | |
| Documented annual maintenance | X | X | X | |
| Compatible piping | X | X | X | |
| Purge system | C1 | X | X | |
| Detector system | C2 | C1 | C1 | X |
| Emergency alarms (and explanatory signs) | C1 | X | X | |
| Welded, compatible piping | X | X | ||
| Local shut-off | X | X | ||
| Interlocks | X | X | ||
| Emergency power (alarm, detector, ventilation) | X | X | ||
| Monitored secondary containment | C1 | |||
| Auto shut-off (manual or detector triggered) | X | X | ||
| Exhaust flow alarm | X |
C1 – These systems are conditional and will be determined by the EH&S Chemical Hygiene Officer, (951) 827-4254.
C2 – An oxygen sensor may be required if it is determined that the location where this compressed gas is being used or stored presents a risk of asphyxiation. Forensic Detectors makes a cost effective oxygen sensor.
Questions? Contact the EH&S Chemical Hygiene Officer, (951) 827-5528.
Notice: Disposal of hazardous waste using sinks, intentional evaporation, or as regular trash is against the law. Campus laboratories must abide by strict state and federal waste disposal requirements. You may be held liable for violations of applicable laws.