NFPA NFPA 30 Flammable and Combustible Liquids 3 — Questions and Answers
Question 1: Under NFPA 30, which type of vent pipe is required on an above-ground atmospheric storage tank containing Class I liquids?
- Open vent pipe only
- Flame arrester or pressure-vacuum vent (Correct answer)
- Pressure relief valve set at 15 psi
- Check valve vent
Correct answer: Flame arrester or pressure-vacuum vent
NFPA 30 requires above-ground atmospheric tanks storing Class I liquids to be equipped with a flame arrester or pressure-vacuum vent to prevent ignition of vapors.
Question 2: According to NFPA 30, what is the minimum distance between a flammable liquid dispensing station and any ignition source?
- 5 feet
- 10 feet
- 20 feet (Correct answer)
- 25 feet
Correct answer: 20 feet
NFPA 30 requires a minimum separation of 20 feet between flammable liquid dispensing operations and potential ignition sources.
Question 3: Under NFPA 30, what is the definition of a 'flammable liquid' based on flash point?
- Flash point at or above 200°F
- Flash point below 100°F (Correct answer)
- Flash point between 100°F and 140°F
- Flash point above 140°F
Correct answer: Flash point below 100°F
NFPA 30 defines a flammable liquid as one with a flash point below 100°F, distinguishing it from combustible liquids which have higher flash points.
Question 4: According to NFPA 30, what is required when a leak is detected in an underground storage tank system?
- Continue operation and monitor daily
- Immediately stop use and notify the regulatory authority (Correct answer)
- Reduce fill level to below the leak point
- Install additional leak sensors and retest in 30 days
Correct answer: Immediately stop use and notify the regulatory authority
NFPA 30 requires that the system be immediately taken out of service and the appropriate regulatory authority be notified when a tank leak is detected.
Question 5: Under NFPA 30, what must be posted near flammable liquid storage or dispensing areas?
- OSHA 300 Log
- 'No Smoking' or 'No Open Flames' signs (Correct answer)
- Material Safety Data Sheets only
- Fire department contact number only
Correct answer: 'No Smoking' or 'No Open Flames' signs
NFPA 30 requires 'No Smoking' and 'No Open Flames' warning signs to be prominently posted in flammable liquid storage and dispensing areas.
Question 6: According to NFPA 30, which containers are approved for storing Class I flammable liquids in quantities up to 5 gallons?
- Any plastic container with a screw-top lid
- Listed safety cans or approved metal containers (Correct answer)
- Standard 5-gallon buckets with lids
- Clear glass jugs with cork stoppers
Correct answer: Listed safety cans or approved metal containers
NFPA 30 requires Class I flammable liquids in quantities up to 5 gallons to be stored in listed safety cans or approved metal containers.
NFPA NFPA 30 Flammable and Combustible Liquids 3
Under NFPA 30, which type of vent pipe is required on an above-ground atmospheric storage tank containing Class I liquids?