Pipeline Corrosion & Mill Qualification

Pipeline integrity & corrosion

Corrosion work here is written to an integrity decision: remain in service, repair, or replace. Internal and external mechanisms are modeled together with coatings, CP, and remaining-wall FFS in a single assessment.

Comprehensive corrosion analysis: internal CO₂, H₂S, and microbiologically influenced corrosion (MIC)
CP FEED evaluations and assessments; oxygen, seawater, and galvanic modeling
Erosion-corrosion and sand erosion
Fitness-for-service of general, localized, and pitting corrosion
Coating evaluation and CP remediation
Integrity management, corrosion management plans, and risk-based assessment (RBA) for onshore and offshore systems
Failure analysis of pipeline systems
Inspection related to pipe making and coatings

Oil, water, and gas layers through a 90-degree jumper elbow — Oil, water, and gas through a 90-degree jumper elbow.

Water on the pipe invert and the wall-loss that follows — Water on the invert, and the wall-loss that follows.

Fracture mechanics & fitness-for-service

Fitness-for-service starts from the indication. Wall-loss, surface-breaking flaws, and fracture propagation — including porosity in pressure-containing welded assemblies — are assessed so an operator can decide whether to run, repair, or replace, with a defensible technical basis.

FFS of wall-loss and surface indications
Fracture propagation assessments, including porosity
Pressure-containing welded assemblies
Assessments to API 579 and BS 7910
Remaining-life arguments that can be reviewed by integrity, operations, and regulators

Failure assessment diagram for a girth weld — Failure assessment of a girth weld.

Materials selection & mill qualification

Material selection for sweet and sour service — pipelines, forgings, valves, induction bends, and nonmetallics — tied to specifications that mills and fabricators can actually purchase against. Qualification follows the pipe onto the mill floor and through the data book.

Material selection for sweet and sour service: line pipe, forgings, valves, induction bends, and nonmetallics
Project-tailored specifications for particular requirements: offshore and onshore, high H₂S, CO₂, dense-phase CO₂, H₂, ammonia, and chloride, for line pipe, components, forgings, induction bends, and non-metallics
Mill qualification worldwide: SAWH, LSAW, JCOE, three-roll bend, UOE, and HFERW
Statistical assessment of mechanical, chemical, and dimensional properties of pipes, plates, and coils
TMCP plate evaluation
Personnel and laboratory / NDE system evaluation

Continuous-cooling transformation diagram for a line-pipe steel — Cooling transformation for a line-pipe steel.

Welding technology & HAZ

Weld procedure and HAZ toughness are treated as a materials problem that includes welder qualification. Steel chemistry, heat input, and NDE have to agree before a WPS is a reliable control.

WPS evaluation and qualification requirements for pipelines and components
NDE systems associated with welding of pipe and components
HAZ toughness evaluation
Steel chemistry effects on weld performance, including use of the Steel Chemistry / HAZ Toughness Predictor

Pipe fabrication welding in a shop — Pipe fabrication welding.

Specialized inspection of critical components

Inspection is a scoped review of the component that actually carries the risk — a weld, a coated joint, a mill heat, a pressure-containing assembly — written so the finding can be used in an integrity or materials decision.

Inspection services related to pipe making and coatings
NDE system evaluation for pipelines and pressure-containing components
Review of fabrication quality, mechanical testing equipment, and inspection personnel
Inspection of critical welds, fittings, and assemblies in support of FFS, HIC, or mill qualification
Findings written to the same codes used on the engineering work: ASME, ASTM, NACE, DNV, and API

Codes of record. ASME Boiler and Pressure Vessel Code, ASTM, NACE, DNV, and API — applied as specified by the project.