Associated Works

Everything around the mainline that makes a pipeline operational, secure and compliant.

Overview

Beyond the mainline spread

A pipeline cannot operate on buried pipe alone. Testing, protection systems and civil infrastructure all have to be delivered, and built to fit the mainline schedule.

ICON delivers these associated works with dedicated crews alongside the mainline spread, so interfaces, tie-ins and testing are planned and managed as one project.

Test header and pig receiver set up for the pre-commissioning hydrotest — Pre-commissioning Hydrotest

Scope

What we deliver

Open-Cut River & Stream Crossings

In-stream trenching: excavation across rivers, streams and drainage channels
Flow control: dam-and-pump, flume and cofferdam methods to keep work areas dry
Crossing sections: pre-fabricated, concrete-coated or weighted pipe pulled or lowered into place
Bank restoration: backfill, riprap and erosion protection to the agreed contours

Sheet-piled crossing excavation with dewatering, and a pipe string lowered across a wet crossing by sidebooms — Sheet-piled Crossing ExcavationCrossing Section Lowered into Place

Tie-Ins, Repairs & Maintenance

Tie-ins: connecting test sections, crossings and existing lines, including golden welds with full NDT where hydrotesting is not possible
Hot taps and stopples: connections to live lines with specialist partners
Pipeline repair: sleeves, recoating and cut-outs
Replacement and lowering: rerouting, replacing or lowering existing pipelines

Pipe section rigged in a sheet-piled tie-in pit, and a technician holiday-testing a coated pipe joint — Tie-in PitCoating Inspection Test

Testing & Pre-commissioning

Cleaning and gauging with pigs through each test section
Hydrostatic testing to the specified pressure and hold period
Dewatering, drying and handover to operations

Crew loading a cleaning pig into the pig launcher — Cleaning and Gauging

Test header and pig receiver set up for the hydrostatic test — Hydrostatic Testing

Protection & Stabilization

Cathodic protection: transformer-rectifiers, anode groundbeds, test posts and coupons
Buoyancy control: installation of concrete set-on weights and screw anchors in wet ground
Slope stabilization: retaining walls, gabions, terracing and erosion control

Cathodic protection test station on a desert right-of-way, and a monitoring unit fitted to a coated pipeline — Cathodic Protection Monitoring: Test Station and On-pipe Sensor

Civil Works, Temporary Infrastructure & Right-of-Way

Access roads: new and upgraded roads for pipe haulers and heavy equipment
Pipe yards and staging areas: stockpiles, double-jointing yards and equipment maintenance
Construction camps: accommodation, water treatment and power for remote sites
Dewatering and excavation support: wellpoints, sheet piling and cofferdams
Foundations and piling for facility equipment, winch yard, pipe supports and buildings
Pipeline markers and warning signs at crossings, boundaries and line-of-sight points, plus aerial markers for patrol
Fencing and gates for valve sites and permanent easements
Reinstatement of the right-of-way after construction