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NDT.net Issue - 2017-05 - NEWS
NDT.net Issue: 2017-05
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)

The Validation Centre (TVC) Newsletter

The Validation Centre (TVC) Ltd4, Great Yarmouth, United Kingdom

UKAS UT Onsite Award

As you are aware, back in August 2016, TVC gained UKAS accreditation status for the electrical verification of Ultrasonic Flaw Detectors.

Well. We took it a step further.

As of 10th April 2017, TVC will offer UKAS calibrations for the electrical verification of Ultrasonic Flaw Detectors in our laboratory but also onsite at our client’s premises! So, if you have a contract that means you cannot possibly allow your equipment to be sent out for calibration, we will come to you – no matter where you’re situated. For full details of Schedule of Accreditation, click here.

The gaining of Ultrasonic Flaw Detection UKAS verification, both on- and offsite, is just the start for TVC. We will continue to strive towards excellence and further our certification offerings to our customers.


TVC have been manufacturing the ColcheK system, under exclusive licence for several years but felt it needed further development for a new generation.

After several months of development work, TVC are proud to launch the all new ColcheK2 unit. The new system has a digital display, depth measurement and threshold facility (which were not available on the previous system) and has had a complete overhaul of the internal electronics. The ColcheK2 now has a one button facility which eliminates errors in the initial set up, allowing far greater accuracy than was previously available. Based on the eddy current technique, the new unit is lighter, faster to set up and use and gives instant pass / fail indications with the easy to read and colour changing display.

French physicist, Jean Bernard Léon Foucault (best known for the invention of the Foucault pendulum), discovered Eddy Currents in 1865 when carrying out experiments using magnets and nonmagnetic materials. Foucault observed a resistance to the rotation of a copper disc when it was influenced by a magnet. He also noted the disc became heated! This was the first documented evidence of Foucault Currents or Eddy Currents as we now know them. To find out more about Jean Bernard Leon Foucault, click here.

The ColcheK2 system is a compact and rugged unit which utilises a remote field, through transmission Eddy Current technique. Through transmission probes are similar to differential probes – in basic terms, it’s two coils into two packages – and is therefore, unaffected by temperature and lift off. Through transmission probes detect corrosion and wall thinning remote from the drive coil allowing the below ground inspection of planted steel lighting columns, without excavation around the column base.

Featuring a unique ultrasonic range finding system used to accurately feedback the search head depth inside the column, the ColcheK2 allows the operator to locate and identify the depth of an actual defect and its significance when related to depth. A defect located deep down is less significant than those located near to ground level. The cable entry on a column can also easily be identified by its depth and size and eliminated from the inspection. Planted steel lighting columns either between ground level and cable entry or up to one metre in depth can be inspected by the ColcheK2. Applications include pipework and risers through bulkheads and deck plates on board ships and offshore installations; lighting columns and lamp posts embedded into the ground, and, any other applications where access is limited.

Deployed from the outside of the columns and a small search head, used internally, the system detects loss of wall thickness. Using the normal access door, the ColcheK2 probe can scan the critical area and give an instant reading of the percentage loss of wall thickness on the instrument meter. When used for this type of routine inspection of lighting columns, there is no need to excavate the site as the ColcheK2 can detect a 5% loss of wall section as far down as 750mm below the ground level.

Although testing has confirmed the ColcheK2 can detect faults within aluminium, its usefulness is limited and further testing will not be carried out presently. Increase in frequency due to the properties of aluminium means Eddy Currents can travel only around 150mm below ground and therefore, critical areas may not be fully covered.

Street lamps fail for a number of reasons, for example, bad installation, impacts or corrosion. Lighting columns are most susceptible to corrosion at and slightly below ground level; water, road salt and other chlorides and oxygen from the air combine to make this a highly corrosive area.

The ColcheK2 is currently used by inspection companies and local councils to inspect lighting columns prior to the installation of lights and decorations to check the column is suitable to bear the additional strain. ColcheK2 has been used on seaside resort lighting columns where summer decoration and additional lighting is common. It is also used in special event areas including those around the Isle of Man TT course prior to racing.

Quotations and Calibration Bookings

We have recently updated the TVC website. For the ease of our customers, it is possible to make quotation inquiries directly via our online system.

TVC are also offering faster calibration services. There is a Premium, Fast Track and Standard services available and again, you can now book this via our website. Just create an account, tell us what service you would like and what equipment you’re sending and we’ll allocate you a slot. Please note, terms and conditions apply.

In addition, you can be confident that your details are safe as we have now transferred the site to an ‘https’ status.

If you have a query for an item that isn’t covered on our website or you have a bespoke item you would like to discuss further, don’t forget you can still email our sales team at sales@tvcalx.co.uk


We are pleased to announce we will continue our sponsorship of both PRB Racing and Charlie Soanes.

PRB Racing, run by the enigmatic Rob Barber and his father, Phil, have expanded their team to include Owen Grieve, Eric Wilson, Rob Livesey and Jessica Mason. Rob Barber will be taking on his first race at Three Sisters this weekend. He will also be continuing his partnership with Ohio State University, racing their electric bike ‘Buckeye Current’ the famous Pikes Peak International Hill Climb later in the year. The team will be taking on Oliver’s Mount, the Isle of Man TT, the Ulster Grand Prix, and other meetings which are to be confirmed. We will let you know how they get on.

Used with permission © Aidy J Craig

Charlie Soanes was nominated for Young Shooter of the Year at the Clay Pigeon Association Awards 2017 which was held on 4 February this year and sporting inspiration, Sharon Davies MBE, guest hosted the evening. Charlie came away with the runner up trophy and his successes over the past year have made TVC incredibly proud of sponsoring such a remarkable local youngster. Charlie has since been up and down the UK at various events and powering through with some impressive results. At the beginning of April, he came 1st in Colts class at the Essex Masters. His ambition to take a place on the GB Shooting Team could well be in his grasp as he goes from strength to strength each week.

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