Which information is required on a pipeline marker?

• A. Pipeline owner's phone number
• B. Size of pipeline
• C. Pipeline depth underground
• D. Name of emergency responder agency

Answer: (A)

Pipeline markers are there to quickly identify who operates the line and how to reach them in an emergency. The essential bit on a marker is the operator’s name and an emergency contact phone number, so responders can immediately notify the responsible party and obtain details about the product and site conditions. The number should connect to the operator or their designated representative, not a personal line. Information about the pipeline’s size or how deep it is underground isn’t typically shown on markers, and listing a specific emergency responder agency isn’t the standard requirement. In short, the marker provides a direct way to contact the pipeline operator in an emergency, which is why a phone number for the operator is the most relevant detail.