Subsea TOFD

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Time of Flight Diffraction - weld inspection

Page last modified
November 8 2023

Defects in welds compromise the integrity and stability of offshore assets. 

TOFD is an advanced non-destructive ultrasonic inspection method, which provides accurate sizing of defects quickly and reliably. 

It was originally developed as a method to provide accurate monitoring and sizing of through-wall height of in-service discontinuities in the nuclear industry. TOFD allows for a incredible accurate data collection and measuring the critical through-wall size of weld defects. 

TOFD normally goes hand in hand with the usage of other non-destructive testing solutions such as Phased Array.


No shutdown is required
Quick inspection method
Accurate sizing of defects
All results are immediately available
Sensibility to all flaw types of welds (cracks, slag, etc.)


Ultrasonic waves Utilizes ultrasonic waves to detect faults.
Exact measurement of time Relies on the exact measurement of time taken for ultrasonic waves to travel from the emiting probe to the diffracted waves received by probe.
Time of flight Measuring this 'time of flight' gives and accurate size and location of the flaw.
Applications Topside, Subsea and Welded Structures

Relative Business Impact


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Technology Readiness Level


Development Technology demonstration Mature / Proven
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AISUS offer a suite of remote inspection solutions which have been designed to solve key industry challenges. Innovation is at our core. We are driven by a commitment to provide the best inspection solution for often challenging operational environments. Our vast industry experience, combined with our innovative technologies is what sets us apart and provides our clients with the best results. We have secured a strong reputation for operational excellence and a track record for safe, high-quality, successful delivery.

Our open and transparent approach allows us to communicate directly with our customers which in turn ensures efficiencies in project delivery and promotes strong working relationships. We like to ask questions to get the best understanding of the situation. This allows us to design and package services that will address challenges quickly and cost-effectively, without ever compromising on safety. And because we’re a highly experienced team, based in one central location, we can deliver a streamlined service and work at a pace at every stage of the project process, which is key due to the nature of the industry and its challenging requirements.

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