Chevron’s Gorgon project includes a three-train, 15.6 million tonnes per annum liquefied natural gas facility and a domestic gas plant with the capacity to supply 300 terajoules of gas per day to Western Australia. As part of the project, Cryoquip Australia were engaged to design, supply, install and commission a cryogenic ethane vapour recovery unit which was required as part of the project’s ethane storage system.

Scope

Promech were engaged by Cryoquip Australia through PROCOM Consultants to complete the design of all pressure vessels contained within the ethane vapour recovery unit and also to complete the pipe stress analysis of all critical process lines contained within the unit.

All pressure vessel designs were completed in accordance with the requirements of AS1210 and Chevron’s project specifications.

As the piping was being designed for a temperature range of -120°C to +130°C, a
comprehensive pipe stress analysis for the system was an essential component of the design.

The pipe stress analysis, completed using Caesar II, was utilised to calculate code stresses and confirm they were in compliance with ASME B31.3, to calculate equipment loads to ensure they were acceptable, to calculate support loads to enable the structural design of the skid and also to calculate the lowest natural frequency of the piping system to ensure it was above the minimum recommended industry guideline.

Project Achievement

Promech’s key project achievements included:

  • All design work completed within a compressed design schedule to ensure the overall equipment supply schedule was maintained
  • Pressure vessel and piping design for cryogenic design temperatures
  • Completion of all design deliverables in compliance with Chevron’s technical specifications and design review process

Project Details

Client: Chevron

Project Location: Barrow Island, WA

Year: 2015

Role:
Pipe Stress analysis
Pressure vessel design