Risk & Assurance

Pipeline Corridor Twin

Projection: today

0 of 3 segments below retirement thickness

de Waard-Milliams Sour Gas (CO₂ / H₂S) & CUI Process-Coupled Kinetics

Couples process telemetry (Temperature, pCO₂ partial pressure, H₂S sour service, and CUI insulation moisture) to dynamically recalculate wall-loss rates and RBI inspection shifts.

API 571 / de Waard-Milliams Kinetics

Process Temp82°C

CO₂ Partial Pressure1.8 bar

Sour H₂S Content180 ppm

CUI Wet Cycling35%

Segment / Circuit	Baseline Rate	Process-Coupled Rate	Baseline RUL	Coupled RUL	RBI Inspection Shift
DEMO · Jetty 1 product transfer line (DEMO-CI-JT-01)	0.12 mm/yr	1.39 mm/yr	2.4 yr	0.2 yr	Pull forward 26 mo
DEMO · Northern pipeline review section (DEMO-CI-PL-N01)	0.12 mm/yr	1.39 mm/yr	12 yr	1.1 yr	Pull forward 131 mo
DEMO · Pipeline pump manifold (DEMO-CI-PM-01)	0.12 mm/yr	1.39 mm/yr	7.2 yr	0.6 yr	Pull forward 79 mo

Wall-Thickness Degradation Trajectories vs. Retirement Limit

Cursor: +0y

Remaining Corrosion Allowance Matrix (% of Design Allowance)

≤0% = At or below retirement wall

DEMO · Jetty 1 product transfer line · DEMO-CI-JT-01

6.02 mm / min 5.8 mm

Marine atmospheric corrosion · 0.12 mm/yr (two-point rate) · measured 2026-03-16 · DEMO · Marsden Point Terminal

DEMO · Northern pipeline review section · DEMO-CI-PL-N01

6.62 mm / min 5.2 mm

External corrosion / coating damage · 0.12 mm/yr (two-point rate) · measured 2026-03-16 · DEMO · Marsden Point–Wiri corridor

DEMO · Pipeline pump manifold · DEMO-CI-PM-01

6.82 mm / min 6 mm

Localised corrosion · 0.12 mm/yr (two-point rate) · measured 2026-03-16 · DEMO · Marsden Point Terminal

Linear projection from the last measured thickness at the two-point or engineer-override corrosion rate. Bar shows remaining corrosion allowance between nominal and retirement thickness. Not a substitute for ILI defect assessment (B31G / RSTRENG) or engineer-of-record fitness-for-service.