Prince Rupert Gas Transmission Aerial Crossing

TransCanada Pipelines Limited/Universal Pegasus International

From 2013 to 2015, Allnorth was engaged on the proposed 900-kilometre natural gas pipeline from Hudson’s Hope to Progress Energy’s Pacific NorthWest LNG facility on Lelu Island, BC.

At the Front End Engineering Design (FEED) stage, Allnorth’s scope of work was centred on the assessment of the supporting infrastructure including, forestry roads, highways, rail and marine to access the pipeline right-of-way, compressor stations, workforce housing, intermodal yards and stockpile/laydown sites. Allnorth’s scope included, but was not limited to:

  • Engagement of six First Nation communities to support field assessments
  • Classification of over 3,000 km of existing forestry service roads
  • Evaluation of BC Ministry of Transportation and Infrastructure (MoTI) highway infrastructure to establish ideal transportation routes
  • Investigation of BC rail network to establish ideal transportation routes and possible siding sites
  • Assessments of 192 existing forestry bridges
  • 3D modelling of the 750 km onshore right-of-way to quantify volumes and support capital cost estimating
  • Evaluation of scope of work for upgrade and new construction for 1,000 km of forestry service roads
  • Evaluation of scope of work for upgrade and new construction for 192 forestry bridges
  • Evaluation of scope of work for upgrade and new construction for 200 km of rail and 10 siding sites
  • Assessment of aggregate sources over 1 M ha area
  • Preliminary design of pipeline aerial crossings spanning 50-350 m
  • Constructability assessment of proposed pipeline aerial crossings
  • Input into Ministry of Environment (MoE) and Oil and Gas Commission (OGC) regulatory permits
  • Input into route alignment, logistics and procurement
  • Development of construction schedules for proposed works
  • Development of cost estimates for proposed works

At the detailed engineering stage, Allnorth was working directly for TransCanada, leading the detailed engineering design for multiple pipeline aerial crossings spanning 40 m to 280 m. Bridge concepts under development include, steel girder structures, delta frame structures and suspension structures. Allnorth was also responsible for coordinating and managing detailed wind engineering analysis for multiple crossing locations.

Peace River Aerial Crossing

  • This is a 280 m clear span suspension bridge to provide aerial crossing for two 1.219 m diameter pipelines, spanning the Peace River approximately 7 km South-West of Hudson’s Hope, BC
  • Detailed design to IFC was conducted from Jan – Dec 2014

Natlan Creek Aerial Crossing

  • Spanning the Natlan Creek approximately 25 km North-East of Hazelton, BC
  • Construction: 2-span, 70-m long steel girder bridge to provide aerial crossing for a single 1.219 m-diameter pipeline
  • Detailed design to IFC was conducted from Feb – Dec 2014

Utsun Creek Aerial Crossing

  • Spanning the Utsun Creek approximately 24 km North of Hazelton, BC
  • Construction: 2-span, 145-m long delta frame bridge to provide aerial crossing for a single 1.219 m-diameter pipeline
  • Detailed design to IFC was conducted from Feb 2014 – Feb 2015

 

 

 

 

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