The new package offers high repeatability for periodic monitoring and quality assured data for extending protective machine life and enhancing plant safety.It is designed to minimize (or even eliminate) downtime and inspection time and is a positive way to avoid possibility of catastrophic failure with the high capital cost this involved. The TOFD has the ability to detect, and simultaneously size flaws of any orientation in any where within the weld and heat affected zone, regardless of the type and orientation (with exception of the near surface area). This carried out by using a single pair of ultrasonic transducer, and inspection rate of 50 to 100(m) weld per day are achievable independent on access.The main advantages advantages of TOFD versus radiography are as follows: - No need for radiography protection rules.
-Other work could be carried out in the immediate vicinity with no evacuation required.
- Work could be carried out during a short down within 24 hours period without destruction to any other activity
- Results are given in real time negating the use of processing.
- Finite sizes are available therefore repair area could be accurately determined.
- Repair area could be quickly examined to prove removal of flaw by grinding.
- TOFD has been demonstrated to give lower repair rates.
-Reporting is faster with an easily understood format.
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