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N.U.E Offshore — Marine Services

Pipeline
Installation
& Maintenance

End-to-end subsea and nearshore pipeline solutions for Nigeria's offshore petroleum industry — from route survey and lay operations to in-service inspection and emergency repair.

What We Do

Full-Scope
Pipeline Services

01
Surveyor
Route Survey & Site Investigation

Geotechnical and geophysical seabed surveys, pipeline route selection, bathymetric mapping, and environmental baseline studies for offshore and coastal pipeline corridors.

02
Pipeline installation
Pipeline Lay Operations

S-lay, J-lay, and reel-lay pipe installation in water depths from nearshore to 500m. Single and multiphase flowlines, risers, umbilicals, and flexible pipe systems.

03
Pipeline installation
Welding & Tie-In Works

Hyperbaric and habitat welding, subsea tie-in to manifolds and PLEM structures, pipeline end terminations, mechanical connector installation, and field joint coating repair.

04
Pipeline installation
Hydrostatic Testing & Commissioning

Pre-commissioning pig runs, cleaning, gauging, flooding, hydrotesting, dewatering, and drying operations. First-oil commissioning support and operator handover documentation.

05
Pipeline installation
In-Service Inspection (ILI)

Inline inspection pig runs using MFL and UT tools, ROV-based visual inspection surveys, CP cathodic protection assessments, and corrosion monitoring for operating pipelines.

06
Pipeline installation
Emergency Repair & Intervention

24/7 emergency pipeline repair capability — leak detection, isolation clamp deployment, hot-tap operations, and subsea repair by diving and ROV support vessels on standby.

How We Work

Our Project
Methodology

Front-end engineering
Phase 01
Front-End Engineering

Define, Design,
De-Risk

Every pipeline project begins with rigorous front-end engineering — route selection, wall thickness design, material specification, and a detailed risk register before a single pipe is touched.

  • Route survey and seabed characterisation
  • Stress analysis and on-bottom stability calculations
  • Cathodic protection and coating design
  • FEED deliverables to ASME B31.4 / B31.8 / DNV standards
Marine installation
Phase 02
Marine Installation

Precision Lay,
Every Kilometre

Our marine spread — lay barge, support tugs, survey vessels, and dive support — delivers precise pipe installation with real-time position monitoring and as-built survey throughout.

  • S-lay for shallow and intermediate water depths
  • J-lay and reel-lay for deepwater applications
  • DGPS-controlled lay with as-built confirmation
  • Rock-dump and concrete mattress placement for free-span crossings
Pipeline maintenance
Phase 03
Integrity & Maintenance

Keep It Flowing,
Keep It Safe

Pipeline integrity doesn't end at commissioning. Our ILI, inspection, and rapid-repair capability ensures assets continue operating safely through their full design life — and beyond.

  • Annual ILI pig runs with MFL and UT tools
  • ROV visual inspection and CP surveys
  • Corrosion inhibitor injection and monitoring
  • 24/7 emergency clamp and hot-tap response
Our Assets

Key Equipment
& Fleet

Pipe Lay Barge

Semi-submersible lay barge with 12-station welding line, tensioner array, and A-frame launch. Capable of S-lay in up to 200m water depth.

S-Lay200m depthDP2
Diving Support Vessel

DSV with saturation diving system to 300m, work-class ROV, and 50-tonne crane. Primary asset for subsea tie-ins, inspection, and emergency repair.

Saturation DivingROV WROV300m
Survey Vessel

DP1 survey vessel equipped with multibeam echo sounder, sub-bottom profiler, and USBL for route survey, as-built confirmation, and ILI support.

MultibeamSBPUSBL
Welding Equipment

Lincoln Electric and Miller automated GMAW welding stations, automated ultrasonic testing (AUT) systems, and RT/TOFD NDT equipment for girth weld QC.

GMAW AutomatedAUTTOFD NDT
ILI Inspection Tools

Magnetic flux leakage and ultrasonic inline inspection tools from 6" to 48" diameter, supported by pig tracking systems and SCADA data acquisition.

MFLUT Wall Loss6"–48"
Emergency Repair Clamps

Full inventory of split-sleeve and bolted repair clamps for 4"–36" pipe, hot-tap drilling machines, and isolation plugging equipment for live pipeline repairs.

Split-SleeveHot-TapLive Repair