Telephone: 01202 530166 | 07795 903858

Standard Non-Destructive Testing

At ground level and just below in lighting columns there is an environment rich in moisture, chlorides and oxygen, an environment which promotes the corrosion of steel structures.

The high stress zone for street lighting columns is also at ground level, consequently, any loss of metal thickness in this region can significantly reduce the strength of the column and can, in extreme instances, lead to collapse.

Unfortunately, this corrosion can be just below ground level and impossible to see without expensive excavation. Out testing method uses the ColcheK™ system, a specialised non-destructive inspection tool for the detection and estimation of this corrosive damage by checking this critical zone without having to excavate or prepare the column in any way.

ColcheK™ uses low frequency electromagnetic technology that is non-contacting and does not emit or use  any hazardous radiation. The system compares the wall thickness of the column at and below ground level with the thickness at about 150mm above ground level, and area where there is unlikely to be any major corrosion damage, and if it does exist, can be seen clearly.

Indeed we carry out a visual inspection of the column as part of our testing routine.

By recording the percentage loss of thickness and by visual inspection of the entire column, our test results will ascertain the risk category, life expectancy and retest period of each column. This will eliminate the need for costly replacement of compliant stock, whilst ensuring dangerous columns are highlighted immediately. Each column is graded as follows:-

About Intratest
As part of our commitment to raising standards within our industry, we continually develop the management of our day-to-day activities, through our Business Management Systems, that are independently verified through 3rd party audits to meet industry standards and best practice.

Giving you the reassurance that we operate to the highest possible standards always.

If you have any questions, or need clarity on what is said on our website, please pick up the phone, or click below to send an email, to get the answers you need.


Continually push the boundaries to provide professional, cost effective solutions for our customers in a straight forward, no-nonsense and honest manner.

An approach that is complimented by our commitment to continue to engage, educate and mentor asset owners to ensure that integrity-based solutions become the norm.


  • Proactive Asset Management Programmes
  • Complete NDT Services
  • Integrated solutions
  • Added value & cost effective
  • Market leading technology
  • Conformity to GN22
  • Pinpoint exact seat of corrosion
  • Failures reported immediately
  • Engineers located across the UK

Maintaining Standards

Intratest has joint UKAS certification to ISO9001:2015 and NHSS8 within the Street Lighting Industry.