ASME Standards for Marking Abandoned Pipes

Pipelines can reach the end of their service life or no longer be needed in a system, and when that happens, they must be handled properly to ensure safety and compliance. Simply leaving an unused pipe in place without proper identification can create serious risks. An abandoned pipe may still contain residual hazardous materials, corrode and leak over time, or be mistaken for an active line during maintenance or future modifications.

Recognizing these risks, the 2020 edition of the ANSI/ASME A13.1 Standard introduced specific requirements for abandoned pipe marking, and the 2023 edition reiterated and confirmed these guidelines. Previously unregulated, abandoned pipes are now addressed under Section 4.5, “Abandoned Piping,” which provides guidelines for clearly identifying and marking pipes that are no longer in service but remain physically in place.

Properly labeling abandoned piping systems is critical to prevent accidental use, protect personnel, reduce environmental hazards, and maintain accurate system documentation, helping facilities ensure long-term safety and operational clarity. In this blog, we’ll cover the marking requirements for abandoned piping under ANSI/ASME A13.1 and best practices for safely managing these systems.

ANSI/ASME Marking Guidelines For Abandoned Pipes

Here are the guidelines for marking abandoned pipes specified in section 4.5 of the ASNI/ASME A13.1 standard:

Color Coding

The ANS/ASME A13.1 standard recommends the following color scheme for abandoned piping left in place:

Background: Safety White
Letters: Black
Border: A black border around the marker field

The Legend

The legend or text on the pipe label should be brief, informative, and simple for greatest effectiveness. It should clearly include the word "Abandoned" or similar wording to indicate the pipe is no longer in service. The legend must explicitly state any special conditions, such as:

• Protection by a pressurized fluid for corrosion prevention
• Pipe containing residual hazardous material

For example, an abandoned pipe label might read "Residual Hazardous Material – Abandoned" or "Contains Corrosion-Protection Fluid – Abandoned" to ensure clear communication about the pipe's contents.

Placement and Sizing Requirements

While ANSI/ASME A13.1 does not provide a separate placement standard specifically for abandoned pipes, the general placement guidelines for all pipe markers apply to ensure visibility and safety. Proper placement is essential to prevent accidental use, reduce confusion, and protect personnel.

Key placement considerations include:

• Visibility: Markers should be easily seen from a normal approach.
• Critical Points: Place markers near changes in direction, branches, valves, or flanges to avoid confusion with active lines.
• Structural Penetrations: Mark on both sides of wall, floor, or ceiling penetrations.
• Intervals: Position markers every 20-25 feet along straight runs for consistent communication of the abandoned status.

Sizing Considerations:

Similar to placement, sizing can also follow the general ANSI/ASME A13.1 guidelines for pipe marking. Pipe labels should be legible and clearly visible from a normal point of approach, with lettering large enough to read easily. Using the same sizing standards as active pipes ensures consistency and reduces confusion, with the marker long and wide enough to display the full legend clearly.

By following these guidelines provided by ASME A13.1, abandoned pipes can be clearly identified, reducing safety risks and preventing confusion with active systems.

Clearly Identify Abandoned Pipes with Compliant Labels

Abandoned pipes left in place can pose serious risks if not handled correctly. Get durable and ANSI/ASME compliant pipe marking labels for abandoned pipes in your area to ensure long-term safety and operational clarity. To ensure legibility of your labels, ensure proper cleaning and timely replacement with quality pipe marker supplies.