Publication of HOIS Recommended Practice for Non-intrusive Inspection (HOIS-G-103)

HOIS ( is a well-established joint industry project, managed by ESR Technology Ltd., with project partners in the energy sector including asset owner/operators, non-destructive testing service companies, NDT equipment vendors, The Oil & Gas Technology Centre and regulatory authorities such as the HSE. The HOIS vision is to improve the effectiveness of in-service inspection for the energy industry.

HOIS is delighted to announce the launch of an updated recommended practice for non-intrusive inspection (NII) of pressure vessels (HOIS-RP-103): the result of HOIS work on NII guidance. HOIS first looked at this area in the early 2000s, driven by HOIS member asset owner operators and the UK regulator (HSE), aiming to provide a structured approach to the NII process to ensure consistency of application. The recommended practice document describes good practice at each stage of the NII process so that operators can clearly identify where NII is appropriate and apply it effectively to deliver operational, safety and financial benefits. This HOIS-developed document has previously been published by DNV GL as DNV GL RP G103 and this is now superseded by the HOIS-RP-103 2020 edition.

HOIS has been supported by The Oil & Gas Technology Centre to develop guidance notes (HOIS-G-103) to facilitate the familiarisation of the HOIS-RP-103 document user with key elements of the recommended practice to promote effective application of the NII process.

Both documents are freely publicly available and can be downloaded from


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