Hand cleaning is often the only method to clean pipes greater than 60 inches in diameter?

• A. True
• B. False
• C. Not specified
• D. Sometimes true

Answer: (A)

Cleaning the interior of very large pipes relies on accessibility and the ability to pass cleaning tools through the pipe. When a pipe is greater than about 60 inches in diameter, automated internal cleaning devices (like pigs or other mechanical cleaners) often can’t be deployed or maneuvered effectively due to the size, fittings, or lack of suitable launch/receiving facilities. In those cases, skilled technicians perform hand cleaning to physically scrub and wipe the inner surfaces, ensuring any oils, debris, or residues are removed before testing or coating. While other methods such as high-pressure jetting can assist in some situations, they may not thoroughly clean such large interiors or may introduce safety and containment challenges, making hand cleaning the practical, often sole method in typical projects.