Propane Certification Propane Storage and Handling 1 — Questions and Answers
Question 1: What is the maximum fill level allowed for propane containers, expressed as a percentage of water capacity?
- 90%
- 80% (Correct answer)
- 85%
- 75%
Correct answer: 80%
Propane containers must never be filled beyond 80% of their water capacity to allow space for liquid expansion as temperature rises.
Question 2: How must DOT propane cylinders be positioned when in active use?
- Horizontally on their side
- At a 45-degree angle
- Upright with the valve end up (Correct answer)
- Inverted with the valve end down
Correct answer: Upright with the valve end up
DOT cylinders must be used in the upright position with the valve end up to ensure only vapor, not liquid propane, exits the container during normal operation.
Question 3: What is the maximum temperature that propane containers should be exposed to during storage, per NFPA 58?
- 100°F
- 110°F
- 130°F
- 120°F (Correct answer)
Correct answer: 120°F
Per NFPA 58, propane containers must not be exposed to temperatures exceeding 120°F, as higher temperatures can dangerously increase pressure inside the container.
Question 4: Which type of valve protection is required on propane cylinders that are not connected to an appliance or manifold?
- A pressure gauge
- A check valve
- A protective cap or plug over the valve outlet (Correct answer)
- A ball valve
Correct answer: A protective cap or plug over the valve outlet
Valve outlets on cylinders not in service must be protected with a cap or plug to prevent contamination, damage, and accidental gas release.
Question 5: When storing propane cylinders indoors, what is the maximum aggregate LP-Gas content allowed in a standard storage room without requiring specially constructed facilities?
- 100 pounds
- 200 pounds
- 300 pounds (Correct answer)
- 500 pounds
Correct answer: 300 pounds
NFPA 58 permits up to 300 pounds of LP-Gas in a standard indoor storage area; quantities above this require a purpose-built storage room meeting additional construction requirements.
Question 6: What minimum distance must ASME propane containers of 125 to 500 gallons water capacity be located from buildings?
- 5 feet
- 10 feet (Correct answer)
- 25 feet
- 50 feet
Correct answer: 10 feet
NFPA 58 Table 6.3.1 requires a minimum 10-foot separation between containers of 125 to 500 gallons WC and buildings to provide clearance for emergency response and reduce fire exposure.
Question 7: How should propane cylinders be secured to prevent tipping or falling during storage?
- Stored in wooden crates only
- Chained, strapped, or otherwise restrained in an upright position (Correct answer)
- Laid flat on pallets
- Stored on sloped surfaces to allow drainage away from the valve
Correct answer: Chained, strapped, or otherwise restrained in an upright position
Cylinders must be chained, strapped, or otherwise restrained to prevent tipping, which could damage the valve and cause an uncontrolled gas release.
Propane Certification Propane Storage and Handling 1
What is the maximum fill level allowed for propane containers, expressed as a percentage of water capacity?