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ApprenticeshipsCity and GuildsEU Skills

Commissioning & Decommissioning of Mains and Services

Course Reference



1 or 2 days depending on client requirements


Gas operatives and managers required to undertake or manage commissioning & decommissioning operations of gas mains and services.


To provide the skills, knowledge and competence to enable individuals to undertake safe and competent commissioning and de-commissioning of mains and services.


On completion of the course candidates will be able to:

  • Identify the most appropriate methodology for a given pipeline or Network
  • Demonstrate correct use of tables and associated calculations to determine purge durations to current industry standards/codes of practice for commissioning and decommissioning operations
  • Identify and use correctly, purging equipment, gauges and recording instruments
  • State the safety requirements to be observed, prior, during and on completion of purging operations
  • Discuss the importance of decay tests prior to de-commissioning pipelines or networks
  • Complete associated documentation relating to purging operations.
  • Content

    The course includes:

  • Identification of pressure regimes and approved purging methodologies
  • Use of appropriate tools and equipment (including gauges)
  • Calculation of purge durations, vent and rider sizing
  • Completion of appropriate documentation (including written procedures)
  • Methods

    • Trainer led theory and practical sessions • Multi choice written assessment and/or practical assessment.

    NB. Participants must provide PPE appropriate to activities to be undertaken. Please see joining instructions for more information.

    “We’ve seen tangible business benefits from the training delivered by Utilise. We found Utilise to be a very professional and flexible organisation and more courses are planned for the future.”

    Robin Bradshaw, Technical Operations Director, Lowri Beck

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