Propane Certification Propane Storage and Handling 2

Question 1

What is the primary distinction between a DOT cylinder and an ASME propane container?

Accepted Answer

DOT cylinders are portable and built to Department of Transportation specs; ASME containers are stationary and built to pressure vessel codes

Answer

DOT cylinders are designed for portability and transport under DOT regulations, while ASME containers are stationary storage vessels built to American Society of Mechanical Engineers pressure vessel codes.

Question 2

What does 'FIFO' mean in the context of propane cylinder storage, and why is it practiced?

Accepted Answer

First In, First Out — older cylinders are used before newer ones to prevent exceeding requalification dates

Answer

FIFO (First In, First Out) ensures cylinders stored longest are used first, preventing them from remaining in inventory past their requalification dates.

Question 3

What is the standard requalification interval for most DOT propane cylinders after their initial 12-year qualification period?

Accepted Answer

5 years

Answer

After the initial 12-year qualification period, most DOT cylinders must be requalified every 5 years to ensure the container remains structurally sound for continued service.

Question 4

In what direction must the discharge outlet of a propane container's pressure relief valve (PRV) be directed?

Accepted Answer

Away from the container and toward an open area, not toward personnel or ignition sources

Answer

PRV discharge must be directed away from the container and away from personnel or ignition sources so that venting gas disperses safely into the open atmosphere.

Question 5

Per NFPA 58, what minimum separation is required between separate groups of propane cylinders stored outdoors when the aggregate LP-Gas content of any group exceeds 300 pounds?

Accepted Answer

20 feet

Answer

NFPA 58 requires at least 20 feet of separation between separate groups of cylinders to limit the spread of fire or gas release from one group to another.

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Propane Certification Propane Storage and Handling 2