Tension netting installed offshore to access conductors for inspection and repair.

Conductor Integrity Tension Netting

Vertech rope access technicians installed four hundred metres of tension netting within ten days to carry out strain measurements on good conductors (critical path conductor integrity scope) on the North Rankin Alpha platform, situated one hundred forty kilometres northwest of Karratha. This project presented various constraints, including the environment, simultaneous construction, and operational requirements of the gas production platform.

When installed, the system was required to withstand cyclonic activity up to and above category three, with winds in excess of one hundred and seventy-two kilometres per hour, where other access methods were not suitable. This ultimately enabled this project to be completed through multiple cyclones, ensuring a critical path project could occur.


Image from above of netting platform
  • Engineered Alternative Access Systems
  • Cyclone Rated Access System (Cat 3 and above, wind gust in excess of 172.8km per hour)
  • Multi Discipline Personnel to Complete Additional Scope Requirements.

Before commencement, North Rankin HSE and operations personnel reviewed access to the work area. It was highlighted that a secondary escape route was necessary for work to be carried out in module thirty-nine to ensure the safety of personnel in an emergency. Vertech personnel carried out the additional scaffolding required to include the secondary escape from the twelve-metre level, and they devised an emergency escape plan using IRATA methodology. A mock trial rescue was carried out before the project to ensure an efficient rescue from the area.

The Installation of the alternative access provided a safe system of work for third-party contractors to carry out ultra-high pressure (UHP) water blasting and strain stall measurements on good conductors. The high-risk activities of UHP require a stable platform to ensure personnel are not exposed to added hazards when carrying out coating removal.

This was achieved by additional web decking over the tension net to ensure stability for personnel working on the access system. Once strain testing was completed, the access system was completely removed within two days before a forecasted category cyclone exceeded the recommended wind loading of the access system. This project was a success for means of alternative access on operational gas facilities due to multiple factors: reduction of man hours, Vertech multi-discipline technicians (IRATA, Non-Destructive Testing, Scaffolding, Rigging, certified web net installers, mechanical fitting) and installation of innovative access system withstanding extreme weather condition.

Team Structure Tension Netting Installation

  • 1x Rope access site supervisor, web certified installer and high risk license.
  • 5x rope access, web certified installer, rigging and scaffolding high risk license.

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Conductor Integrity Tension Netting Case Study
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