Lihir Gold Limited (LGL) operates a gold mine and processing facility on Lihir Island in Papua New Guinea. During 2017, LGL undertook a number of upgrade projects within the processing facility.


Promech were engaged by Metrotech to provide mechanical design and code compliance review services for the detailed design for the upgrade of two 36.6m diameter, 14,600 m³ capacity heavy fuel oil storage tanks, namely TK-201 and TK-202. The tank upgrade projects were initiated as a result of API tank inspections undertaken on the tanks following almost 20 years in service. Promech’s scope for the tank upgrade projects included the design of the following items:

  • Complete and partial floor replacements
  • Shell plate patching and upper strake replacement
  • New tank nozzles, manholes, sumps and access door sheets
  • Existing nozzle compliance assessments

In addition to the tank upgrade design work, Promech also completed the detailed design, in accordance with API 2201, for two hot taps to be installed on an existing filtered water pipeline.

Furthermore, Promech worked closely with Metrotech and the construction contractors to develop construction methodologies and provide clear guidance on examination and testing requirements.

Project Achievement

Promech’s key project achievements included:

  • Development of API code compliant floor replacement methodologies without the requirement for tank jacking equipment which was not available at Lihir Island
  • Development of API code compliant upper strake replacement methodology which was successfully implemented on-site
  • Completed detailed design and assisted construction contractor to successfully undertake their first hot tap installation

Project Details

Client: Queensland urban Utilities

Project Location: Brisbane, QLD

Year: 2017

Process Design
Structural, mechanical and piping (SMP) design
Procurement assistance
Safety in Design (SiD)workshop facilitation