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Seabed Excavation

Provision of innovative electric controlled flow excavation (E-CFE®) services to the offshore energy industries

As a dedicated and independent provider of E-CFE® services to the offshore energy industries, our passion for operational excellence is backed up by our proven engineering expertise. 

Today, our advanced range of HYDROMOLES represents a step change in subsea excavation and trenching technology – helping to support the global energy sector’s transition from fossil-based to renewable sources. 

Subsea applications include:

  • Pipeline and cable trenching (including live assets)
  • Backfilling of existing trenches
  • Freespan rectification of existing assets
  • Sandwave remediation
  • Seabed preparation
  • Shallow water / shore approach excavations
  • De-burial excavations for Inspection, Maintenance & Repair (IMR)
  • Rock dump dispersal
  • Decommissioning & salvage excavation
  • Harbour clearances / channel deepening
Seabed Excavation Hydromole E CFE tool 2
Seabed Excavation Hydromole E CFE tool 3
POWER2
Post Lay Freepan Rectification
Key Differentaitors Health Saftey
Seabed Excavation Hydromole E CFE tool 6

Our Technology

All-Electric

The world's only all-electric CFE service provider.

Advanced hydrodynamics optimises and maximises excavation performance, at all water depths

  • Significantly increasing health, safety and environmental performance
  • De-risking client operations through more reliable and efficient technology
  • Providing a platform for the future of remotely operated subsea intervention equipment and services

All-Power

The most disruptive technology in the CFE market.

Collaborative approach to new technology development – a move to E-CFE®

  • Open learning culture between partners
  • The most experienced pool base of E-CFE® personnel resources on and offshore
  • A family of offshore service providers brought together to offer proven engineering, commercial and operational expertise

All-Change

A green CFE revolution driven by industry pioneers.

Supporting the energy transition with sustainable E-CFE® solutions

  • We have taken radical steps to reduce the CO2 footprint of our offshore operations
  • Next generation thinking – looking to the future

HYDROMOLE

About HYDROMOLE

HYDROMOLE allows intervention for multiple seabed applications and soil conditions and is operable at significant water depths without reduction in performance thanks to an all-electric system architecture. 

With a 400kW all-electric twin tool arrangement, HYDROMOLE provides a step change in performance, efficiency, and versatility in both shallow water and deep-water (1.5 to 2,500m) excavation and trenching applications.

Technology Differentiators

  • Major reduction in CO2 emissions
  • No risk to the marine environment from high pressure hydraulic oil spills
  • Negligible noise pollution when electric power unit is operational
  • Significantly increased vessel back deck safety during operations
  • Optimised system performance with surface and subsea diagnosis and datalogging
  • Dramatic increase in project operation uptime and reliability
  • One lightweight umbilical for all system power, controls & survey packages
  • Full power available at the E-CFE®, regardless of water depth

Operating Parameters

  • Water depth operability – 1.5m to 2,500m
  • Maximum flow volume – 6,000 L/s
  • Maximum flow velocity – 12m/s at 3m from nozzle outlet
  • Pressure at nozzle outlet – 7.5psi (at full flow)
  • Cuts soils up to 50kPa @ 3m as standard, and 200kPa+ with high pressure jetting
  • Suitable for variable seabed conditions from sand, clays, silt, gravel and rock dump

System Specifications

Asset Dimensions (approx) Weight (approx)
E-CFE® Subsea Tool 5.9m x 2.4m x 2.4m <12,000kg
Control Kiosk inc. Transformer 16’ Container 12,000kg
Power Container 20’ High Cube Container 16,000kg
Workshop & Spares Container 20’ Container 13,000kg
Overboard Sheave 2.9m x 1.0m x 1.2m 1,500kg
Electric Umbilical Winch 3.0m x 2.8m x 2.6m 6,000kg
Electric Tugger Winch 1.4m x 1.5m x 1.5m 2,500kg (each)

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