Understanding the Variance in Ultrasonic Corrosion Readings
Tracks
NDT Methods
| Tuesday, October 22, 2024 |
| 2:30 PM - 3:00 PM |
| 207/208 - Technical Session |
Details
This presentation addresses the ability of ultrasonics to detect and monitor corrosion by presenting video of corrosion scanning and diagrams of variables that affect detectability, accuracy, and repeatability. It will present:
1) The different corrosion types and the difficulty in detecting the minimum remaining wall thickness
2) The smallest size pinhole pitting that can generally be detected
3) A realistic variance in the repeatability of ultrasonic corrosion readings
Many variables affect detectability and the repeatability of an ultrasonic corrosion reading. Understanding these variables and how they affect the reading is beneficial in determining a realistic variance. The variance is primarily controlled by the ultrasonic procedure's ability to define the variables and provide parameters to assist the technician in acquiring a reading that can be repeated within a realistic tolerance.
The variables presented will include:
• Digitization
• Temperature
• Transducer
• Wave Packet
• Data Acquisition
Today’s flaw detectors and thickness gauges present readings to the thousandth of an inch. Does this mean the reading is repeatable to the same level of accuracy? This presentation provides the insight to determine a reasonable variance an engineer can expect from repeat readings from different technicians, what a realistic detectable pit size pit is, and what happens when a pit approaches through wall thickness (leakage).
1) The different corrosion types and the difficulty in detecting the minimum remaining wall thickness
2) The smallest size pinhole pitting that can generally be detected
3) A realistic variance in the repeatability of ultrasonic corrosion readings
Many variables affect detectability and the repeatability of an ultrasonic corrosion reading. Understanding these variables and how they affect the reading is beneficial in determining a realistic variance. The variance is primarily controlled by the ultrasonic procedure's ability to define the variables and provide parameters to assist the technician in acquiring a reading that can be repeated within a realistic tolerance.
The variables presented will include:
• Digitization
• Temperature
• Transducer
• Wave Packet
• Data Acquisition
Today’s flaw detectors and thickness gauges present readings to the thousandth of an inch. Does this mean the reading is repeatable to the same level of accuracy? This presentation provides the insight to determine a reasonable variance an engineer can expect from repeat readings from different technicians, what a realistic detectable pit size pit is, and what happens when a pit approaches through wall thickness (leakage).
Speaker
Mr Kenneth Heaps
District Manager / NDE III
TEAM Industrial Services
Understanding the Variance in Ultrasonic Corrosion Readings
Presentation Description
This presentation addresses the ability of ultrasonics to detect and monitor corrosion by presenting video of corrosion scanning and diagrams of variables that affect detectability, accuracy, and repeatability. It will present:
1) The different corrosion types and the difficulty in detecting the minimum remaining wall thickness
2) The smallest size pinhole pitting that can generally be detected
3) A realistic variance in the repeatability of ultrasonic corrosion readings
Many variables affect detectability and the repeatability of an ultrasonic corrosion reading. Understanding these variables and how they affect the reading is beneficial in determining a realistic variance. The variance is primarily controlled by the ultrasonic procedure's ability to define the variables and provide parameters to assist the technician in acquiring a reading that can be repeated within a realistic tolerance.
The variables presented will include:
• Digitization
• Temperature
• Transducer
• Wave Packet
• Data Acquisition
Today’s flaw detectors and thickness gauges present readings to the thousandth of an inch. Does this mean the reading is repeatable to the same level of accuracy? This presentation provides the insight to determine a reasonable variance an engineer can expect from repeat readings from different technicians, what a realistic detectable pit size pit is, and what happens when a pit approaches through wall thickness (leakage).
1) The different corrosion types and the difficulty in detecting the minimum remaining wall thickness
2) The smallest size pinhole pitting that can generally be detected
3) A realistic variance in the repeatability of ultrasonic corrosion readings
Many variables affect detectability and the repeatability of an ultrasonic corrosion reading. Understanding these variables and how they affect the reading is beneficial in determining a realistic variance. The variance is primarily controlled by the ultrasonic procedure's ability to define the variables and provide parameters to assist the technician in acquiring a reading that can be repeated within a realistic tolerance.
The variables presented will include:
• Digitization
• Temperature
• Transducer
• Wave Packet
• Data Acquisition
Today’s flaw detectors and thickness gauges present readings to the thousandth of an inch. Does this mean the reading is repeatable to the same level of accuracy? This presentation provides the insight to determine a reasonable variance an engineer can expect from repeat readings from different technicians, what a realistic detectable pit size pit is, and what happens when a pit approaches through wall thickness (leakage).
Biography
Mr. Kenneth Heaps is employed by Team Industrial Services and manages inspection, NDE and mechanical services in the state of Alaska. He has forty years experience working on Alaska's north slope oil fields and the trans-Alaska pipeline. This experience includes the senior Level III responsible for detecting and monitoring corrosion on the country's largest oil producing infrastructure. He is responsible for procedureal guidance to obtain the most accurate and repeatable NDE data possible.
