THV Alert

Rapid Intervention Vessel (RIV) THV Alert was designed with buoy handling, wreck marking, towing and multibeam and side scan hydrographic surveying capability

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Trinity House’s Rapid Intervention Vessel (RIV) Alert has been designed with buoy handling, wreck marking, towing, multibeam and side scan hydrographic surveying capability. With DP1, high specification survey equipment and a maximum speed of 17 knots, Alert is deployed primarily to cover the South East Coast where she can respond rapidly to any maritime incident.

In addition, with her large working deck and 0.6m diameter through hull instrument tube, she is an ideal research platform for deployment of scientific equipment and sampling work. Available 24/7 with accommodation for an additional 4 people, Alert can be utilised for a wide range of projects at very competitive rates.

Available 24/7 with accommodation for an additional four people, THV Alert is a state of the art vessel that can be utilised for a wide range of projects at very competitive rates including:

  • hydrographic surveys including bathymetry, side scan, sonar and wreck investigations
  • aids to navigation deployment, maintenance, repair and examination
  • research platforms for deployment and recovery of scientific equipment
  • sampling projects
  • marine hazard search and marking
  • lifting, towing and accurate positioning of marine equipment
  • recovery and re-establishment of off-station aids to navigation
  • sea trials of electronic and specialty equipment
  • helicopter support
  • safety boat assignments
  • guard duties for cable and pipe laying projects

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Build standard

100 A1, SSC Workboat, Mono, LA, EP, LMC, UMS, DP (CM)

Descriptive note: Shipright (MPMS, SERS, IHM)

Complies with requirements for UK MCA Class VIII vessel.


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The bridge of THV Alert

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THV Alert docks at our Harwich facility

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THV Alert alongside the Sunk Centre light vessel

TECHNICAL SPECIFICATION


  • Port of Registry London
  • Year of Build 2006
  • Call Sign MLPH9
  • Length Overall 39.3m
  • Breadth Moulded 8.0m
  • Depth Moulded 4.0m
  • Draft 2.7m
  • Air Draft 18.0m
  • Maximum Speed 17kts
  • Service Speed 12kts
  • Fuel Consumption at 12 kts 360ltrs/hr
  • Bunker Capacity 42t
  • Fresh Water 12t
  • Endurance 1,500nm @ 15kts / 3,000nm @ 12kts
  • Endurance 5 days working on site
  • Bollard Pull 28t

PROPULSION – MACHINERY

  • Main Engines – 2 x Caterpillar Diesel 1492 kW @ 1600 RPM
  • Auxiliary Generators – 2 Caterpillar C90 Diesel 155 kW @ 1620 RPM
  • Bow Thruster – HRP 155kW @ 1620 RPM
  • Propellers – 2 Kamewa variable pitch 50 XF5/4
  • Running on BIOGEAR XP Environmentally Acceptable Lubricant (EAL)

DYNAMIC POSITIONING SYSTEM

  • Kongsberg C-Pos LR DP (CM)

WORKBOAT

  • RIB 5.4m 50hp

CRANES

  • Palfinger Knuckle Boom –
  • 3.5t @ 10m
  • 2.2t @ 15m
  • Winch 3.3t SWL

CHAIN / TOWING WINCH

  • Chain Capacity 100m x 38mm
  • Max pull 40t

DECK FACILITIES

  • Main Deck Area – 88m2
  • 2 x ISO 10’ Container Lock Down Matrix
  • Electrical Power – 230V and 400V Supplies
  • Pressure Wash – 350bar/5000psi
  • Through Hull Instrument Tube – 0.6m diameter
  • Hold – Storage & workshop

ACCOMMODATION

  • 2 Single Cabins
  • 4 Twin Cabins (Bunks)
  • 6 Crew
  • 4 Spare Berths
  • 1 Mess Room
  • 1 Changing Room:
  • 2 Showers
  • 3 Toilets

HYDROGRAPHIC SURVEY

  • Multi beam E/S – Kongsberg Simrad EM 2040C
  • Echo Sounder – Kongsberg Simrad EA 400
  • RTK Pos MV Oceanmaster RM
  • SVP – Valeport Modus (Fixed Unit)
  • SVP – OSIL Smart AML
  • Sonar – Simrad SL 30/35
  • Side Scan – Simrad GeoAcoustics

COMMUNICATION

  • GMDSS Area 2
  • Satcoms – Sat-C H2095C
  • Iridium – Sailor ST4110
  • MF/HF SSB – R/T DSC Sailor CU5100
  • Navtex Rx – Furuno NX700
  • VHF R/T DSC – 2 x Sailor RT4822
  • VHF – Sailor RT6210
  • Internet Access – All cabins

NAVIGATION EQUIPMENT

  • ECDIS/NAV – Sperry Marine
  • Radars – Vision Master FT
    - Sperry Marine Vision – Master FT X-Band
    - Sperry Marine Vision – Master FT S-Band
  • Dual-Axis Speed Log – Consilium SAL SD4-2
  • DGPS – 2 x Litton Marine LMX 420
  • Gyro Compass – Sperry Navigat Fibre Optic
  • TMC Magnetic Compass – Sperry Navipol 1
  • Auto Pilot – Sperry NaviPilot 4000 l
  • Echo Sounder – Sperry ES 5100-01


Download full specification for THV Alert [PDF]