TOFD Time-Of-Flight Diffraction

SonoInspec can assist you in setting up your non-intrusive inspection (NII) plan, whereby the aim is to keep your production and HSE performance to the highest level by executing non-intrusive non-destructive testing while the plant is in full operation.

SonoInspec uses TOFD inspections to keep your production at the highest level

The SonoInspec team has a long-standing experience with the use of the TOFD (Time-of-flight diffraction) technology on very high temperatures. The team has executed ultrasonic weld inspections on client assets up to a temperature of 475°C (887°F).

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Benefits of TOFD

Fast & accurate inspection, direct results, no radiation

Weld inspections at high temperature

Inspection of “Golden” welds at pre-heat temperature

For weld inspections & wall thickness mausurements

The high temperature TOFD NII inspection capability is an excellent inspection method for weld inspections, but also wall thickness measurements with TOFD line scans, when the regular high temperature ultrasonic corrosion mapping tools are not sufficient anymore. Up to 350°C (662°F) SonoInspec has standardised and validated the TOFD inspections as per the ISO pre-service standard for pressure equipment (EN-ISO 10863) in the thickness range of 6mm up to 100mm.

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Successful validations and inspections at 300°C (572°F)

Successful validations and inspections have been executed at 300°C (572°F) at client’s vital reactors with a wall thickness of 270mm. Accurate calculations about sound wave paths at these temperatures are made in advance. The TOFD high temperature inspection capability is extremely suitable to be used for monitoring purposes of known cracks.

Our partners include:

Sintra Engineers
MISI
Waygate Technologies
ICE
NDTS India
Sonotech Trinidad

Finding cracks using sound wave technology

TOFD is a very accurate inspection technology based on sound wave, travelling from the transmitter to the receiver and from the tips of cracks (diffract the signals). Both longitudinal and transverse sound waves can be used to achieve the highest POD. With TOFD you can accurately measure length, depth, and height of the indications in your weld. TOFD is normally not used for characterisation of the indication, like slag inclusion etc.

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With TOFD there’s no need to abandon the area like with radiography

TOFD inspections are a cost reducing alternative to radiography inspections. As TOFD does not work with radiation, you do not need to abandon the area like with radiography. The inspections can be done at day shift, data is digitally stored, and results can be made available immediately. Inspection productivity is much higher as with radiography especially when the wall thicknesses increase.

Inspection of welds on the critical path of the planning, the so called “golden” welds can be inspected with TOFD at pre-heat temperature when the weld is only partly finished. This reduces the chance for rejections and time losing repairs, after the weld has got its final inspection.

Want to learn more about TOFD?

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