What Could Go Wrong?
Compression fitting ferrules exposed to vibration and pressure pulsations could work axially along the tube over a period of time if incorrectly installed or the tube compression fittings are composed of incompatible materials.
This event can potentially lead to a loss of containment of high pressure flammable vapour or fluid and subsequently result in a dangerous occurrence or major accident event.
Key Lessons
A manufacturer of any plant has a general duty of care under the OPGGS Act 2006 to take all reasonably practicable steps to ensure the plant is designed and constructed to be safe and without risk to health. In addition, the manufacturer is responsible for
carrying out the research, testing and examination necessary to identify, and eliminate or minimise, any risk to health and safety that may arise from the use of the plant.
Operators should carry out an audit of compression tube fittings and ensure that these fittings have been installed in accordance with the manufacturer's recommendations and that the ferrules remain in the correct location.
Operators are to ensure installation and inspection competency in personnel including contractors and third parties undertaking the fitting and maintenance of compression fittings. This may include the implementation of a maintenance audit regime that routinely
inspects compression fittings subjected to vibration and pressure pulsations, with comprehensive and complementary training and procedures.
Recommended guidelines are available in the Oil and Gas UK publication HS016
Management, Design, Installation and Maintenance of Small Bore Tubing System.
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