TOFD – In-line Inspection Service for Cracking

Detection and sizing of axial and circumferential cracks

A key feature of our technology portfolio is the Time-of-Flight Diffraction (TOFD) solution. The TOFD method is the only existing in-line inspection technology capable of detecting and quantitatively sizing cracks in girth welds, seam welds and cracks originating from installations welded externally to a pipeline.

Your benefits of our TOFD Service

Icon: Binary code with a check mark on it.

Real-time collection of pipeline data enables immediate decision-making

Icon: Binary code with a magnifying glass on it.

Quantitative sizing of crack depths and accurate high-resolution data

Icon: Pipeline from which a tool comes out and a sheet of paper over it.

Preliminary report of pipeline integrity delivered on-site

Icon: A piggy bank with a crossed out dollar coin in it.

Avoid unnecessary costly repairs or replacement

Animation of a TOFD tool in a cut-open pipeline to explain the technology with a green and yellow beam.

Time-of-Flight Diffraction technology

TOFD uses pairs of sensors, one acting as a transmitter and the other as a receiver. Broadband longitudinal ultrasonic waves are emitted and the generated sound field profiles are recorded and evaluated. The shortest connection between the transmitter and receiver is the surface wave (lateral wave), while the longest sound path is via the real wall (back wall echo). If no further signals occur, the material is free of defects. If echoes occur between the two signals, defects are present in the inspected volume. The ultrasound impulse impinging the defect generates new ultrasound waves at its edges (diffraction waves). These propagate spherically and also reach the receiving sensor, generating a corresponding signal.

Download our TOFD service specifications and learn more

Download Component

Any questions on our tethered inspection solutions?

Let us know how we can help you and one of our sales or support representative will get in touch with you shortly. 

We look forward to hearing from you!