Key HOIS themes

Two key HOIS themes are:

  • Non intrusive inspection
    • The industry standard for NII of pressure vessels, DNV RP GL G103, was originally developed by HOIS in 2008, revised in 2011.  A recent HOIS project is significantly updating it, and will launch HOIS-RP-103 in 2020, to replace all earlier versions of the document.
    • Substantial benefits from performing non intrusive inspection (NII) instead of conventional intrusive visual inspection of pressure vessels: 
      • Safety - up to 80% fewer confined space entries with corresponding reduction in the number of line breaks and sunsequent leak tests.
      • Financial - increased production and lower maintenance costs, the OGTC figure from December 2017 suggests that NII could deliver up to £242 million of savings per year to the UK continental shelf alone (
  • Corrosion under insulation (CUI) and external corrosion.
    • Significant challenge for the Oil and Gas industry
    • CUI has caused ruptures and fires leading to damage costing 10s of millions of pounds on single assets
    • Estimated that 60% of piping failures are due to CUI

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