GTS - Gas Training Solutions

Most of our courses include refresher training that is designed to prepare the engineer for the assessment process. Our experience is that this is the preferred option for most course attendees.

However, we also provide an ‘assessment only’ option for engineers who are confident enough to undertake the assessments without any refresher training.

Scheme rules

To view the scheme rules for the various assessment schemes, please click on one of the links below:


Engineers undertaking the ACS assessments for the first time are required to take the ‘initial’ assessments which are normally valid for 5 years. To be eligible for the initial assessment, engineers must be able to produce evidence of their gas-related qualifications e.g. NVQ qualification or previous ACOPS qualification

Engineers renewing assessments that have expired (or are about to expire) have an option to take ‘re-assessment’. In most cases, the ‘re-assessment’ process is slightly shorter than the ‘initial’ assessment process. To be eligible for re-assessment, engineers must be able to provide the centre with evidence of their ACS certificates of competence.

‘MOT’ style certification

Engineers renewing their ACS assessments can now take advantage of the ’MOT’ style certification process. This approach allows engineers to take their assessments up to 6 months before they are due to expire without losing out.

In these cases, the new certificates will be dated with an expiry date of 5 years after the expiry date listed on the old certificate.