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THIEN ANTECHNICAL SERVICES
SPECIALIST DOMAIN

SUBSEA SOLUTIONS

Subsea inspection, ROV, diving and pipeline support.

Subsea inspection, ROV, diving and pipeline support through verified specialists.

04
Core Pillars
Inspection • ROV • Diving • Pipeline
300m+
Operating Envelope
Typical partner capability up to 300m+, subject to ROV/diving spread and project requirements
Guidance
Applicable reference
May follow applicable IMCA / IOGP guidance, subject to provider and project requirements
01
Project Coordination
Clear scope and responsibility matrix

TECHNICAL ARCHITECTURE

INTEGRATED SUBSEA OPERATIONS SCHEMATIC

From DSV and control systems through diving and ROV spreads to seabed assets.

DSV / SUPPORT VESSEL0mSea Surface-50mCommercial Diving Zone-150mROV Operational Envelope-300mSeabed Assets & PipelineUSBL ACOUSTIC POSITIONING LINK01. COMMERCIAL DIVING (0M - 50M)UWILD survey • Ultrasonic NDT • Structural clamps02. ROV SYSTEM (-50M TO -300M+)Multibeam Sonar • Valve Intervention • USBL03 & 04. PIPELINE & SPOOL TIE-INFlange tie-in • CP potential survey • Subsea ManifoldSUBSEA OPERATIONAL TELEMETRYDEPTH ENVELOPE:0m — 300m+SAFETY CODE:Project-specific guidance

Illustrative partner workflow; verify ownership, certification and operating limits per project.

Surface (0m) — Support vessel & topside control center
Diving Zone (-20m to -50m) — Commercial diving & NDT inspection
ROV Zone (-50m to -300m) — Robotic intervention & multibeam sonar
Seabed Assets — Pipeline, spool tie-in & subsea manifold

CORE CAPABILITIES

FOUR CORE CAPABILITY PILLARS

Resources, equipment suitability and responsibilities are verified per project.

01

Subsea Inspection & Survey

Integrity & Survey

NDT, cathodic protection (CP) surveys and UWILD for platforms, FPSOs and pipelines.

Technical Scope of Work

  • Seabed bathymetry & high-resolution sonar mapping
  • Subsea non-destructive testing (NDT) & ultrasonic thickness gauging
  • Cathodic Protection (CP) potential surveys & anode inspection
  • Underwater Inspection in Lieu of Drydocking (UWILD)

Key Deliverables

Digital inspection dossiers, high-definition video and asset integrity assessments.

02

ROV Support & Intervention

Robotics & Survey

Observation and work-class ROV support for installation, touchdown monitoring and intervention.

Technical Scope of Work

  • Pipelay touchdown monitoring & subsea structure positioning
  • Mechanical intervention: subsea valve operations & hot stabs
  • Turbid water acoustic imaging using multibeam sonar
  • Real-time ultra-short baseline (USBL) underwater acoustic positioning

Key Deliverables

ROV logs, USBL positioning records and intervention verification reports.

03

Commercial Diving Support

Surface Supplied Diving

Air and Nitrox diving for inspection, maintenance, hull cleaning and subsea repairs.

Technical Scope of Work

  • Jacket platform member inspection, marine growth removal & hull cleaning
  • Underwater cutting, wet welding, and structural clamp installation
  • Sea chest valve inspection, blanking, and propeller clearing
  • Salvage assistance, seabed debris clearing & site preparation

Key Deliverables

Dive records, personnel qualification checks and inspection reports per project.

04

Subsea Pipeline & Spool Tie-in

Installation & Repair

Support for subsea pipeline installation, repair, metrology and spool tie-in coordination.

Technical Scope of Work

  • Subsea acoustic & taut-wire metrology coordination
  • Spool piece fabrication coordination, testing, and lowering
  • Subsea flange tie-in & riser clamp installation support
  • Hydrotesting, pipeline leak detection & protective concrete mattress installation

Key Deliverables

As-built dossier, subsea rigging and lifting plans, and hydrostatic test records.

DELIVERY MODEL & RESOURCE ALIGNMENT

Transparent Partner Coordination Model

Project checks cover scope, safety, equipment and responsibility. Vessels, ROVs and diving spreads remain partner-owned.

START YOUR SUBSEA CONVERSATION

We clarify scope, assess risk and structure the right spread for your offshore campaign.

Request Subsea Consultation

THIEN AN · TECHNICAL SERVICES

LET’S DEFINE YOUR NEXT MOVE.

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