If insulation plugs are removed to permit thickness measurements, what issue should be watched for?

If insulation plugs are removed to permit thickness measurements, what issue should be watched for?

• A. Moisture ingress into insulation
• B. Color changes in insulation
• C. Corrosion of pipe exterior coating
• D. Increased heat loss

Answer: (A)

Removing insulation plugs to take thickness measurements creates a path for ambient moisture to enter the insulation. That moisture inside the insulation is the main issue to watch for because it can lead to corrosion under insulation (CUI) and degradation of thermal performance. After the measurement, plugs should be promptly reinstalled and the area properly sealed to maintain the moisture barrier. Look for signs of moisture entry such as damp insulation, weight gain, rust or staining on the pipe exterior, or coating damage, which can indicate CUI developing. If moisture is suspected, dry-out and a targeted inspection for CUI should follow.

Removing insulation plugs to take thickness measurements creates a path for ambient moisture to enter the insulation. That moisture inside the insulation is the main issue to watch for because it can lead to corrosion under insulation (CUI) and degradation of thermal performance. After the measurement, plugs should be promptly reinstalled and the area properly sealed to maintain the moisture barrier. Look for signs of moisture entry such as damp insulation, weight gain, rust or staining on the pipe exterior, or coating damage, which can indicate CUI developing. If moisture is suspected, dry-out and a targeted inspection for CUI should follow.