Midstream Operations
Pipeline Services
Design, construction, inspection, and repair of onshore pipeline systems — delivered to NUPRC, ASME, and international pipeline integrity standards.
Service Overview
End-to-End Pipeline Services
Sequential International provides a full range of pipeline services for hydrocarbon transmission and distribution systems across the Niger Delta. From new pipeline construction to repair of corroded or damaged sections, our teams deliver to international pipeline codes.
Our pipeline engineers combine technical expertise with practical field experience to ensure every pipeline project meets design life expectations, regulatory requirements, and safety standards.
“Pipeline integrity is not a one-time check — it is a continuous commitment. We help operators maintain that commitment throughout the pipeline life cycle.”
What We Deliver
Scope of Work
Pipeline Construction
Construction of new flowlines, trunk lines, and gathering systems including trenching, welding, and backfilling.
Pipeline Repair
Repair of corroded, cracked, or mechanically damaged pipeline sections using approved repair sleeves and welding procedures.
Inline Inspection (Pigging)
Cleaning pig runs, gauge pig runs, and intelligent pig inspection support for pipeline integrity management.
Hydrostatic Testing
Pre-commissioning and periodic hydrostatic testing of new and existing pipelines to regulatory and client specifications.
Cathodic Protection
Installation and monitoring of impressed current and sacrificial anode cathodic protection systems.
Integrity Management
Pipeline risk assessment, ILI data review, and integrity management planning to ASME B31.8S and API 1160.
How We Work
Our Service Process
Survey & Design
Route survey, soil investigation, and detailed pipeline engineering design.
Construction / Repair
Qualified welding, coating, and installation with NDT verification of all welds.
Testing & Commissioning
Hydrostatic testing, cleaning, drying, and pre-commissioning activities.
Documentation & Handover
As-built drawings, test records, and regulatory certificates delivered to client.
Why Choose Us
Key Benefits
ASME / API Compliant
All pipeline work executed to ASME B31.4, B31.8, and API pipeline codes as applicable.
Certified Welders
Qualified and certified welders with procedure qualification records (PQR) for carbon steel pipelines.
NDT Verification
Radiographic and ultrasonic testing of all butt welds to verify integrity before commissioning.
Full Regulatory Package
Hydrostatic test records, weld maps, NDT reports, and as-built drawings for NUPRC submission.
Cathodic Protection
Corrosion protection design and installation to extend pipeline service life.
Rapid Repair Response
Emergency repair teams available for rapid mobilisation to pipeline failure sites.
Pipeline work involves trenching, confined spaces, welding, and high-pressure testing. Sequential International maintains a comprehensive pipeline HSE plan covering excavation safety, hot work, test exclusion zones, and emergency pipeline isolation procedures.
Capabilities
Equipment & Capabilities
Welding Equipment
SMAW, GTAW, and FCAW welding sets with procedure qualification records for pipeline carbon steel.
NDT Equipment
Radiographic, ultrasonic, and magnetic particle inspection equipment for weld verification.
Pigging Equipment
Foam pigs, cleaning pigs, and gauge plates for pipeline cleaning and internal inspection launches.
Hydrostatic Test Pumps
High-volume test pumps with calibrated gauges and data loggers for pipeline pressure testing.
CP Monitoring
Reference electrodes, data loggers, and test point equipment for cathodic protection surveys.
Construction Plant
Excavators, side-booms, and coating application equipment for pipeline construction and rehabilitation.
Have a Pipeline Project or Repair Need?
Contact our pipeline engineering team for a technical review and commercial proposal. We service all pipeline sizes and operating pressures across the Niger Delta.