If corrosion rate for new pipe is unknown and no other data is available, what is the maximum time before obtaining thickness readings?

If corrosion rate for new pipe is unknown and no other data is available, what is the maximum time before obtaining thickness readings?

• A. 1 month
• B. 3 months
• C. 6 months
• D. 12 months

Answer: (B)

When you start with new pipe and have no corrosion data, you need to establish a baseline by obtaining initial thickness readings early in service to determine the corrosion rate. If you wait too long, you risk missing early thinning or misjudging the rate, which can lead to unsafe life predictions. The practical requirement is to measure the wall thickness within the first three months of service to set a reliable starting point for corrosion rate calculations. Waiting longer than that can delay accurate assessment and potentially expose the system to unexpected thinning. Shorter than that may yield too little data to establish a rate, while three months is considered the upper bound for establishing the initial rate.

When you start with new pipe and have no corrosion data, you need to establish a baseline by obtaining initial thickness readings early in service to determine the corrosion rate. If you wait too long, you risk missing early thinning or misjudging the rate, which can lead to unsafe life predictions. The practical requirement is to measure the wall thickness within the first three months of service to set a reliable starting point for corrosion rate calculations. Waiting longer than that can delay accurate assessment and potentially expose the system to unexpected thinning. Shorter than that may yield too little data to establish a rate, while three months is considered the upper bound for establishing the initial rate.