CoatingPassport · schema v1.1Demo · Subsea structure

NCS-MANIFOLD-DEMO-M-08 — Coating Passport

Annual GVI on an 8-slot production manifold (commissioned 2008, 326 m water depth) by work-class ROV. Findings emphasize the CP retrofit window — anode array 82% depleted, exceeding DNV-RP-B401 80% threshold for subsea structures where retrofit options are limited. Marine growth impedes weld-access; coating breakdown from prior intervention damage.

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Asset

Asset ID: NCS-MANIFOLD-DEMO-M-08
Type: Subsea structure
Material: coated_steel
Operator: Demo Subsea AS
Installation year: 2008
Water depth: 326
Inspection cycle: Annual general visual inspection

Inspection

Timestamp: Mon, 09 Feb 2026 14:45:00 GMT
Footage source: rov
Duration: 90 min
Frames analyzed: 162,000
Operator tier: platform
Model version: hullproof-vlm-v2.1.3

Findings summary (4)

critical

severe

moderate

minor

Findings detail

anode depletion

confidence 94%156 framesimg-quality 89%severe

Anode array 82% depleted across A1-A4. Exceeds DNV-RP-B401 80% threshold for subsea structures where retrofit options are limited.

Location: Primary anode array A1-A4, north side (0, 0, 0)

Recommended action: Urgent CP retrofit design study. Anode-clamp or pile-driven supplementary anodes required before next campaign. Potential survey within 60 days to confirm protection adequacy.

marine growth

confidence 88%624 framesimg-quality 82%moderate

Marine growth 80-90 mm thickness on upper structural members. Impedes ROV access for close-visual inspection of critical welds.

Location: Manifold structural members, upper 2 m (0, 0, 2)

Recommended action: Schedule water-jet cleaning campaign before next general-visual inspection cycle to restore access to weld inspection targets.

corrosion

confidence 78%89 framesimg-quality 76%minor

Localized surface corrosion at hub-connector C-3 collar interface, estimated 6% wall-thickness loss. Within NORSOK U-009 monitoring threshold.

Location: Hub connector C-3 collar interface (4, 2, 1)

Recommended action: Confirm UT measurement at next inspection; trend across cycles.

coating breakdown

confidence 81%198 framesimg-quality 79%moderate

NORSOK M-501 coating system breakdown ~12% over a 3 m × 0.5 m frame-member section. Active corrosion at breakdown perimeter. Consistent with ROV-impact damage from prior intervention.

Location: Frame member F-2, mid-section (-2, 1, 0)

Recommended action: Spot-coat repair at next ROV campaign with epoxy patch; document for end-of-life coating renewal study.

Compliance

EU AI Act class: high_risk_ai_system
Review workflow: Pending

Applicable standards

• DNV-OS-F101 (Submarine pipeline systems)
• DNV-RP-B401 (Cathodic protection design)
• NORSOK U-001 (Subsea production systems)
• NORSOK U-009 (Life extension for subsea systems)
• ISO 13628 (Petroleum and natural gas industries — design and operation of subsea production systems)
• API 17A (Design and operation of subsea production systems)
• PSA Norway Activities Regulations §45

Interoperability

Cognite CDF compatible: Yes
OSDU mapping: osdu:reference-data--AssetType:SubseaStructure:1.0.0
Veracity export: Not exported
Knowledge graph: Not generated

The same JSON powers Cognite CDF Asset+Timeseries, OSDU exports, RDF knowledge graphs, and MCP-tool calls from agentic systems. PDF is a renderer of this; never the source.