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HYDRAULICS

Subsea Hydraulic Equipment - Couplings, Testing & Control Systems

Comprehensive Subsea Hydraulic Solutions

Legasea provides complete subsea hydraulic equipment solutions for offshore oil and gas operations, supporting critical subsea production systems with reliable hydraulic control technology. Our expertise spans hydraulic couplings, stab plates, umbilical testing, and fluid management systems designed for demanding subsea environments.

Hydraulic Couplings and Quick Connect Systems

Advanced Manufacturing Hydraulic Couplings

Legasea supplies high-performance hydraulic couplings manufactured using advanced production methods to meet urgent operational requirements. Our hydraulic coupling solutions provide:

  • Quick Connect Capability - Rapid connection and disconnection for emergency operations

  • High-Pressure Performance - Rated for extreme subsea hydraulic pressures

  • Corrosion Resistance - Marine-grade materials for long-term subsea service

  • Leak-Free Operation - Precision-engineered sealing systems

  • Emergency Response - Fast delivery for critical operational requirements

 

Hydraulic Coupling Applications

Our hydraulic couplings serve diverse subsea applications:

  • Subsea tree hydraulic connections

  • Manifold hydraulic interfaces

  • Emergency disconnect systems

  • Hydraulic tool connections

  • Intervention equipment interfaces

Hydraulic Stab Plates - Legacy Equipment Interface Solutions

Stab Plate Refurbishment Services

Legasea specialises in refurbishing and testing hydraulic stab plates, enabling legacy subsea equipment to interface with modern systems for critical operations. Our stab plate services include:

Subsea Tree Interface Stab Plates

  • Production Tree Connections - Interface plates for subsea tree hydraulic control

  • Intervention Stab Plates - Specialised plates for workover and intervention operations

  • Abandonment Operation Plates - Interface solutions for well abandonment procedures

  • Emergency Connection Systems - Rapid deployment stab plates for emergency operations

Stab Plate Testing and Certification

  • Pressure Testing - High-pressure hydraulic system verification

  • Leak Testing - Comprehensive seal integrity verification

  • Functional Testing - Complete operational cycle testing

  • Dimensional Inspection - Precise measurement and tolerance verification

  • Material Inspection - Corrosion assessment and material integrity analysis

Umbilical Hydraulic Testing Services

Pre-Mobilisation Umbilical Testing

Legasea's hydraulic testing division provides comprehensive umbilical testing services prior to offshore deployment:

Hydraulic System Testing Procedures

  • System Integrity Testing - Complete umbilical hydraulic circuit verification

  • Pressure Testing - Multi-pressure level testing protocols

  • Flow Testing - Hydraulic flow rate and pressure drop analysis

  • Contamination Testing - Fluid cleanliness verification and analysis

  • Performance Validation - Complete system performance verification

Long-Term Storage Preservation

Professional umbilical preservation services for extended storage periods:

  • Fluid Preservation - Specialised preservation fluid systems

  • System Purging - Complete moisture and contamination removal

  • Protective Coating - Corrosion prevention treatments

  • Environmental Protection - Climate-controlled storage solutions

  • Periodic Maintenance - Scheduled preservation maintenance programmes

Hydraulic Fluid Management and Specifications

Industry-Standard Hydraulic Fluids

Subsea production systems and hydraulic control valves require precisely specified fluids for optimal performance:

Hydraulic Fluid Specifications

  • SAE AS 4059 Class 6 B-F - Premium hydraulic fluids for subsea control systems

  • Ultra-High Filtration - Advanced filtration for contamination control

  • Temperature Stability - Fluids designed for extreme temperature variations

  • Corrosion Inhibition - Enhanced corrosion protection additives

  • Biodegradable Options - Environmentally responsible hydraulic fluids

Chemical Injection Fluids

  • SAE AS 4059 Class 8 B-F - Specialised chemical injection fluids

  • Methanol Injection Systems - Hydrate inhibition fluid management

  • Corrosion Inhibitor Fluids - Pipeline protection chemical systems

  • Scale Inhibitor Systems - Production enhancement chemical fluids

  • Biocide Injection Fluids - Microbial control chemical systems

Advanced Hydraulic Testing Capabilities

Multi-Circuit Testing Systems

Legasea employs sophisticated manifold systems for efficient umbilical testing:

Grouped Testing Methodology

  • Pressure Rating Separation - Umbilicals grouped by pressure specifications

  • Fluid Type Segregation - Separate testing circuits for different fluid types

  • Parallel Testing Capability - Multiple umbilical testing simultaneously

  • Automated Testing Sequences - Computer-controlled test procedures

  • Real-Time Monitoring - Continuous pressure and flow monitoring

Calibrated Instrumentation Systems

All testing equipment maintains ISO 11171 calibration standards:

  • Precision Pressure Gauges - Accurate pressure measurement and recording

  • Flow Measurement Systems - Calibrated flow rate monitoring equipment

  • Temperature Monitoring - Precision temperature measurement and logging

  • Data Logging Systems - Comprehensive test data recording and analysis

  • Contamination Monitoring - Real-time fluid cleanliness measurement

Additional Subsea Hydraulic Equipment

Hydraulic Power Units (HPUs)

Subsea hydraulic power generation systems:

  • Electric HPUs - Electrically powered subsea hydraulic systems

  • Seawater HPUs - Seawater-powered hydraulic systems

  • Emergency HPUs - Backup hydraulic power systems

  • Portable HPUs - Mobile hydraulic power solutions

Hydraulic Accumulators

Pressure storage and surge protection systems:

  • Piston Accumulators - High-pressure hydraulic energy storage

  • Bladder Accumulators - Flexible membrane accumulator systems

  • Diaphragm Accumulators - Compact accumulator solutions

  • Emergency Accumulators - Fail-safe hydraulic backup systems

Hydraulic Valves and Control Systems

Precision hydraulic control components:

  • Subsea Control Valves - Remotely operated hydraulic valves

  • Pilot Valves - Precision hydraulic pilot control systems

  • Shuttle Valves - Hydraulic logic and switching valves

  • Relief Valves - Overpressure protection systems

  • Check Valves - Hydraulic flow direction control

Hydraulic Manifolds and Distribution

Hydraulic system distribution and control:

  • Subsea Manifolds - Multi-circuit hydraulic distribution systems

  • Hot Stab Receptacles - Live hydraulic connection systems

  • Hydraulic Distribution Units - Centralised hydraulic control systems

  • Emergency Shut-Down Systems - Safety hydraulic control systems

Hydraulic Filtration Systems

Contamination control and fluid conditioning:

  • High-Pressure Filters - Subsea hydraulic fluid filtration

  • Return Filters - Hydraulic return line filtration systems

  • Suction Strainers - Coarse filtration protection systems

  • Portable Filter Units - Mobile hydraulic fluid conditioning

Hydraulic System Applications

Subsea Production Control

  • Subsea Tree Control - Complete hydraulic tree control systems

  • Manifold Operations - Hydraulic manifold control and monitoring

  • Pipeline Isolation - Emergency pipeline isolation systems

  • Wellhead Control - Subsea wellhead hydraulic operations

Intervention and Workover

  • Hydraulic Workover Systems - Complete hydraulic intervention packages

  • Coiled Tubing Support - Hydraulic systems for coiled tubing operations

  • Snubbing Operations - Hydraulic pressure control systems

  • Emergency Response - Rapid deployment hydraulic systems

Subsea Processing

  • Subsea Separation - Hydraulic control for subsea separators

  • Subsea Compression - Hydraulic systems for subsea compressors

  • Subsea Pumping - Hydraulic control for subsea pump systems

  • Flow Assurance - Hydraulic systems for flow management

Quality Standards and Certifications

Legasea hydraulic systems comply with industry standards:

  • ISO 11171 - Calibration of automatic particle counters

  • API 16C - Choke and kill equipment standards

  • API 6A - Wellhead and tree equipment specifications

  • NACE MR0175 - Materials for sour service applications

  • DNV GL - Offshore classification and certification

Environmental Considerations

Sustainable Hydraulic Solutions

  • Biodegradable Fluids - Environmentally responsible hydraulic fluids

  • Leak Prevention - Advanced sealing technology for environmental protection

  • Fluid Recovery - Hydraulic fluid recycling and recovery systems

  • Waste Minimisation - Sustainable fluid management practices

Technical Documentation and Certification

Comprehensive documentation for all hydraulic services:

  • Cleanliness Level Certificates - ISO 4406 contamination analysis

  • Pressure Test Reports - Complete pressure testing documentation

  • Calibration Certificates - Equipment calibration records

  • Material Certificates - Component material traceability

  • Performance Reports - System performance verification documents

Emergency Response Capabilities

Legasea provides rapid response hydraulic services:

  • 24/7 Emergency Support - Round-the-clock technical assistance

  • Express Delivery - Urgent hydraulic component supply

  • Offshore Support - On-location hydraulic system support

  • Emergency Repairs - Critical hydraulic system restoration

Learn More:

Hydraulic Couplings

Stab Plates

Contact US

Unit 11

Birchmoss Plant & Storage

Echt, Westhill, 

Aberdeenshire

Scotland

AB32 6XL

+44 1224 058 040

info@legasealtd.com

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© Copyright Legasea Ltd 2025 

All Rights Reserved.

Legasea Ltd is registered in Scotland, with company number SC617131.

VAT Registration Number: 320 7210 55 

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