Subsea controls

About the course

Ideal for anyone new to subsea controls or working in associated support roles, this course explains how control systems operate and the engineering principles involved.

This course will give you the opportunity to see what different parts of the system look like, get an independent comparison of the kit and equipment available, and gain a greater insight into this specialist area. Key areas that are often overlooked will be discussed in detail, such as managing availability and the reliability of controls.

Learning outcomes

  • Explain how subsea control systems operate
  • Compare different types of subsea control systems
  • Identify a range of subsea equipment and its functionality
  • Appreciate the issues associated with the design and manufacturing of subsea controls equipment
  • Appraise new technologies




2 Days

Study hours




Upcoming dates


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Subsea controls - course contents


Design criteria

  • Oil or gas or both
  • Type of platform
  • Distance from platform to reservoir
  • Water depth
  • Reservoir pressure and temperature
  • Number of wells
  • Number of functions
  • Project life expectancy

Selection of system

  • Direct hydraulic
  • Piloted hydraulic
  • Sequence hydraulic
  • Electro hydraulic
  • Multiplex electro hydraulic
  • All electric

Topside equipment

  • Master control station (MCS)
  • Remote operator workstation (ROWS)
  • Electrical power unit (EPU)
  • Uninterruptible power supply (UPS)
  • Hydraulic power unit (HPU)
  • Topside umbilical termination unit (TUTU)
  • Chemical injection unit (CIU)

Subsea equipment

  • Umbilical
  • Subsea umbilical termination unit (SUTU)
  • Subsea distribution unit (SDU)
  • Jumpers/flying leads
  • Electrical/hydraulic connectors
  • Subsea control module (SCM)
  • Subsea electronic module (SEM)
  • Valves


Operation of system

  • System options
  • Hydraulic
  • Electrical
  • Communications
  • Redundancy
  • Signal commands
  • DCV operation

System interfaces

  • Supervisory control and data acquisition (SCADA)
  • Screen mimics
  • Logging on/off
  • Valve opening/closing
  • Valve foot printing
  • Page selection
  • Trending
  • Reports
  • Calculation
  • Inter locks

Fluid types, selection, management and cleanliness

  • Synthetic fluid
  • Water based fluid
  • Environmental legislation
  • Cleanliness manufacturing
  • Cleanliness offshore operations
  • Cleanliness standards
  • Measuring cleanliness
  • Filters
  • Wear mechanisms
  • Flushing

Intervention of system

  • Safety and environment
  • Workover
  • Installation and workover control system (IWOCs)
  • Emergency quick disconnect (EQD)
  • Divers/ROVs
  • Cleanliness standards
  • Inspection, repair and maintenance (IRM)
  • Tools

Future developments

  • Obsolescence
  • Future developments for systems
  • Subsea processing
  • Better well management