Tender Summary: Provision for Intelligent Pigging Service

Objectives

The primary objective is to conduct in-line inspection of two onshore hydrocarbon pipelines to identify internal and external corrosion, recordable flaws, and structural anomalies. The service aims to deliver high-fidelity inspection data, perform trend analysis against historical surveys, and generate a five-year corrosion growth assessment to support pipeline integrity management, operational safety, and maintenance planning.

Scope of Work

The contractor will supply all necessary supervision, equipment, tools, materials, and transport to launch, propel, and recover cleaning, gauge, and intelligent pigs through two specified pipelines: a 12-inch petrol line and a 14-inch diesel line, each measuring 3.4 kilometers. Firewater will serve as the driving medium. Key responsibilities include verifying line cleanliness prior to inspection, conducting a gauge pig run to confirm piggability, advising on site utility and infrastructure requirements four weeks prior to mobilization, and executing all operations in strict compliance with industry standards. Subsea pig recovery is explicitly excluded and will be performed by the client. The contractor must submit detailed operational schedules and adhere to rigorous engineering practices throughout the project.

Technical Requirements

• Inspection Methodology: Must utilize an axial field magnetic flux leakage (MFL) tool equipped with a location transmitter and accelerometer.
• System Preparation: Cathodic protection facilities must be properly de-energized and re-energized before and after each pigging operation.
• Reporting Timelines: Cleaning report (24 hours), gauge/intelligent pig run report (24 hours), initial instrument performance report (24 hours), preliminary defect report (7 working days), and final inspection report (20 days).
• Enhanced Feature Reports: Minimum fifteen detailed reports per pipeline are required for all defects impacting Maximum Allowable Operating Pressure (MAOP).
• Data Accuracy: Defect location within ±1 meter of reference points, distance to nearest weld within ±20 millimeters, and affected joint length within ±30 millimeters.
• Compliance Standards: Operations and reporting must align with API 1163, NACE SP0102, ASME B31.G, and Pipeline Operator Forum specifications.
• Acceptance Criteria: Full tool functionality validation is mandatory. Non-compliance permits the client to mandate a free rerun or apply a pro-rata price reduction.

Skills and Personnel Requirements

• All personnel must be qualified for safe and efficient execution, adhering strictly to client safety protocols and site regulations.
• Data analysts must hold at least Level 2 certification in the applicable inspection method.
• A Level 3 certified specialist must be readily available to resolve disputes or clarify features affecting MAOP.
• The contractor bears full responsibility for personnel transportation, accommodation, safety apparel, and immediate replacement of any staff deemed non-compliant.

Key Technical Terms Explained

• Intelligent Pigging: Advanced in-line inspection using specialized sensor-equipped devices to map internal and external pipeline conditions without excavation.
• Axial Field MFL: A non-destructive testing technique that aligns magnetic fields longitudinally along the pipe to detect metal loss, wall thinning, and cracks.
• FFP/S (Fitness for Purpose/Service): An engineering evaluation determining whether identified defects compromise structural integrity under current or future operating pressures.
• Cathodic Protection De-energization: Temporary shutdown of electrical anti-corrosion systems during pig runs to prevent electromagnetic interference with sensitive inspection sensors.