DWTEK I90+ Offshore-Grade ROV Rental
I90+ - shown with the optional manipulator
The most capable ROV in SepcoTech's rental fleet. Six in-house DWT8537 thrusters, a 25 kg payload bay, and unlimited shore power make the I90+ the system of choice for deep inspection, offshore wind, O&G, and demanding current conditions - available worldwide.
The I90+, part by part
Every figure below is from the specification table further down this page. The rental unit comes with the HD camera and twin LED lights; the manipulator in this photo is an optional add-on.
- 01CameraHD × 1Standard camera. Optional: up to SD × 4, including a wrist camera.
- 02Lighting2 × 150 W LED300 W in total. Additional LED units available.
- 03ManipulatorOptionalUp to 5-axisFor valve operation, object retrieval and tool deployment.
- 04Tether150 m electro-opticalStandard TMS tether, optical-fibre data link. A 500 m tether consumables set is included in the rental.
- 05Thrusters6 × DWT85374 horizontal, 2 vertical, built in-house. 70 kgf forward, 60 kgf lateral, 48 kgf vertical.
- 06Frame130 kg in air1,100 × 700 × 530 mm (L × W × H). Rated to 500 m, 1,000 m optional.
Purpose-Built for Offshore Conditions
DWTEK designs and manufactures 90% of the I90+'s components in-house - thrusters, connectors, cameras, lighting, and electronics - to aerospace-grade tolerances.
Class-Leading Thrust
Six DWT8537 thrusters deliver 70 kgf forward, 60 kgf lateral, and 48 kgf vertical thrust - engineered for station-holding in strong tidal and offshore currents that overpower lighter systems.
25 kg Payload Bay
Large adjustable payload section with 8 MCC ports and 3 TLC ports. Simultaneously accommodates sonar, DVL, USBL, CP probe, UT gauge, manipulator - configured for your specific mission.
300 W LED Illumination
Twin 150 W LED floodlights give powerful, even illumination for evidence-grade inspection footage at depth. Optional additional lighting available for high-turbidity environments.
Unlimited Shore Power
220 V shore-fed, 300 V / 6 kW subsea output - no batteries, no dive limits. The I90+ runs continuously for the full duration of your operation without interruption or recharging.
Mobilised worldwide - deployed where conditions are hardest
The I90 series has been put to work on offshore wind, oil & gas and survey campaigns across more than seven countries - launched over the side on the client's LARS and run continuously on shore power, dive after dive.
Built From the Ground Up
by DWTEK
Founded in 2008, DWTEK manufactures 90% of all components in-house using aerospace-grade DMG MORI 6-axis precision machining. Every thruster, connector, camera, LED light, and sensor is designed and built in Taichung, Taiwan - giving SepcoTech and its clients full traceability, short lead times, and direct manufacturer support.
- IMCA-trained ROV pilots (IMCA R002 guidelines) available
- Global deployments: US, Canada, Turkey, Russia, Japan, Korea, UK
- Proven on offshore wind, O&G, wreck inspection, and academic missions
- DNV-GL certified 16 ft / 20 ft ROV control containers available
- I90+ units operated across 7+ countries by client teams
DWTEK I90+ - Full Specification
General ▾
| Depth rating (standard) | 500 m |
| Depth rating (optional) | 1,000 m |
| Dimensions (L × W × H) | 1,100 × 700 × 530 mm |
| Weight in air | 130 kg |
| Payload capacity | 25 kg (adjustable) |
| Max speed | 3 knots |
| Available sensor ports (MCC) | 8 |
| Available sensor ports (TLC) | 3 |
Propulsion ▾
| Horizontal thrusters | 4 × DWT8537 (in-house) |
| Vertical thrusters | 2 × DWT8537 (in-house) |
| Forward / reverse thrust | 70 kgf |
| Lateral thrust | 60 kgf |
| Vertical thrust | 48 kgf |
Imaging & Lighting ▾
| Standard camera | HD × 1 |
| Optional cameras | Up to SD × 4 (incl. wrist camera) |
| Standard lighting | 2 × 150 W LED (300 W total) |
| Optional lighting | Additional LED units available |
| TMS cameras (standard) | SD × 2 |
| TMS lighting (standard) | 23 W × 2 |
Power & Tether ▾
| Power input | 220 V, single-phase, 50/60 Hz |
| Power output (subsea) | 300 V, 6 kW |
| Data link | Optical fibre |
| TMS type | Cage (I-90 series) |
| TMS tether (standard) | 150 m electro-optical |
| Rental tether consumables | 500 m set included |
Navigation & Control ▾
| Heading sensor | Standard (included) |
| Depth sensor | Standard (included) |
| Navigation sensor | PCG Navigation Sensor (included in rental) |
| Recording system | TiDVR (included in rental) |
| Surface control | Portable Main Console with LIM, 19" Mobile Rack |
| Automatic control | Optional |
| Altitude sensor | Optional |
| Obstacle avoidance sonar | Optional |
Optional Equipment ▾
| Manipulator | Up to 5-axis arm (optional) |
| Positioning | DVL, INS, USBL |
| Inspection sensors | CP probe, UT gauge, Eddy current probe |
| Sonar | Multibeam, scanning sonar, SSS |
| Cleaning tools | Rotation brush, high-pressure water jet |
| Cable tracking | Cable tracking system |
| Survey | SBES, MBES, SBP, altimeter |
| Control container | 16 ft / 20 ft DNV-GL certified |
Configure for Any Mission
The I90+'s 8 MCC and 3 TLC ports support simultaneous deployment of multiple tools. DWTEK designs and manufactures most add-ons in-house.
Positioning & Navigation
USBL Positioning
Ultra Short Baseline acoustic positioning - track ROV location in real time referenced to surface GPS.
DVL (Doppler Velocity Log)
Precision velocity and position referencing for survey-grade navigation and station-holding.
INS (Inertial Navigation)
Inertial navigation system for high-accuracy subsea positioning in GPS-denied environments.
Obstacle Avoidance Sonar
Forward-looking sonar for safe ROV navigation in confined or complex subsea environments.
Inspection & NDT Tools
Cathodic Protection (CP) Probe
Measures electrical potential of subsea structures to assess corrosion protection status. Recommended: RTS Contact CP or similar.
UT Thickness Gauge
Ultrasonic wall thickness measurements on steel structures. Recommended: Cygnus_1_ROV or similar.
Flood Member Detection (FMD)
Detects water ingress into hollow tubular structural members - critical for offshore platform integrity.
Eddy Current Probe
Pulsed eddy current testing for near-surface defect detection without removing marine growth or coatings.
Sonar & Survey
Multibeam Imaging Sonar
Wide-area acoustic imaging for zero-visibility conditions. Recommended: Tritech Gemini 720is or similar.
Scanning Sonar / SSS
360° scanning sonar or side-scan sonar for seabed mapping and structure inspection at range.
Altimeter (VA500)
Precision acoustic altimeter for consistent altitude hold during seabed survey operations.
Depth Sensor (Valeport MiniIPS)
High-accuracy pressure-based depth sensor for precise positioning data throughout the dive.
Intervention & Cleaning
Manipulator Arm (up to 5-axis)
Multi-axis manipulator for valve operation, object retrieval, and tool deployment. Recommended: Hydrolek 43000 / EH5 or similar.
Rotation Brush
DWTEK in-house rotation brush or FlexiClean for marine growth removal from structural surfaces.
High Pressure Water Jet (HPWJ)
High-pressure water jetting for cleaning, coating removal, and surface preparation subsea.
Cable Tracking System
Tracks subsea cable depth of burial and route for cable O&M inspection and survey operations.
Full OWF Inspection & IRM Capability
The I90+ is extensively deployed on offshore wind farm operations. The system and its sensor suite support the full range of GVI, NDT, and intervention tasks required for foundation and cable O&M.
GVIGeneral Visual Inspection
- →Foundation condition & damage assessment
- →Paint coating inspection
- →Scour protection monitoring
- →Marine growth monitoring
- →J-tube inspection
- →Grout inspection
NDTNon-Destructive Testing
- →CP readings (cathodic protection)
- →Ultrasonic thickness measurement (UT)
- →Flood member detection (FMD)
- →Pulsed eddy current testing
- →Cable entry inspection
- →Subsea cable monitoring
IRMIntervention & Other
- →Marine growth removal (rotation brush)
- →Scour monitoring (multibeam survey)
- →Grout and coating assessment
- →Subsea cable depth of burial
- →Sensor-based structure scanning
- →High-pressure water jetting
Where the I90+ Gets Deployed
I90 Series Deployed in 7+ Countries
I90+ Rental Package
SepcoTech provides a fully configured I90+ system ready for deployment - including all documentation, consumables, and surface control equipment.
Included in Rental
- ●DWTEK I-90+ ROV - HD Camera, 2× LED Lights
- ●PCG Navigation Sensor
- ●TiDVR Recording System
- ●Portable Main Console with LIM (19" Mobile Rack)
- ●System pigtails for integration
- ●ROV Spare Parts Set
- ●500 m tether consumables set
- ●1st shipment via sea freight to your location
Optional Add-ons
- ●ROV Skid for manipulator or tools
- ●Electric Cable Reel - 300 m or 500 m
- ●Supporting Onshore Technician
- ●Air freight & import handling
- ●Sensor & tool sourcing / integration
- ●16 ft / 20 ft DNV-GL control container
Customer to Supply
- ●Sonar / Sensors / Tools (rental + integration)
- ●Certified ROV Supervisor
- ●Qualified ROV Pilots
- ●Project Management
- ●LARS / Winch / Umbilical
- ●ROV Control Container
Certified crew required. A certified ROV Supervisor and qualified ROV Pilots must be provided for all project execution. SepcoTech can assist with crew sourcing - please mention this when enquiring.
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I90+ Rental Enquiry
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