Our actuated chock closure pressure vessels are equipped with an automated quick-acting closure. It is an innovatively engineered closure, using hydraulically actuated sliding chocks, that lock the closure plug in place. It is robust in design and provides the operator with a quick and simple opening and closing of the vessel, with the push of a button.

The compact nature of the actuated chock closure allows the body of the vessels to be shorter in height, making them ideal for use in facilities where height is restricted. Manual handling of the relatively heavy chocks is not required, as they simply retract when actuated, into the wall of the vessel body.

The closure plug is the only item that requires handling, during the opening and closing of the pressure vessel. It is relatively low weight and numerous attachment points ensure it can be raised/ lowered using a standard hoist, with a low to moderate lifting capacity. The closure comes with a plug guidance system (PGS) for alignment with the vessel and attachment points are also included on the underside of the closure for hanging off the device under test (DUT).

Used in vertical orientation, these pressure vessels have a relatively small footprint, taking up minimal shop floor space. The pressure vessel can be provided with its own closure handling system, can be installed below ground level or supplied with its own structural safety enclosure.

Pressure vessel system with an actuated chock closure designed for pressure testing subsea sonar technology, buoyancy modules and subsea electrical connectors


  • Material of construction: Stainless Steels, Carbon & Alloy Steels
  • Multi-Penetration Closure
  • Multi-Penetration Vessel Body
  • Pressure: 200 bar to 690 bar
  • Push button Lock/ Unlock with Status Indication & Integral Safety Interlock System
  • Seal Type: O Ring with PTFE back-up-ring or Springsele®,
  • Size: Between Ø500mm to Ø1800mm Bore & Depths of 1000mm to 7500mm
  • Temperature: -20°C to 200°C
  • Volumes: 200 litres to 20,000 litres


  • Custom Size & Pressure Range Available to Meet Specific Requirements
  • Guided Closure Alignment System Allows Easy & Safe Operation
  • Integral Safety Interlock System Prevents Accidental Opening & Allows for Integration with Pressure Control Systems & Safety Enclosure Door Locking Devices
  • Long Service Life
  • Low Maintenance Requirements
  • Multiple Penetrations for Tooling, Electrical Feed-Through & Pressure Control Hardware
  • Quick Acting Opening & Closing Times: 2 Minutes to Open/ Close, 20 Seconds to Lock/ Unlock
  • Rapid, Single Push Button Lock/ Unlock Functionality
  • SWL Rated Closure for Attachment of DUT (Device Under Test) – Reducing the Need for Separate Handling

Applications & Customer Uses

Our actuated chock closure pressure vessel is a popular choice for customers within the Energy and Subsea industry sectors. The safe, quick-acting features and ease of handling provide the customer with the perfect design, suited for in-house operating requirements.

Typically, the Pressure Vessel is used for the FAT and Production Testing of:

  • Buoyancy Products
  • Cable Assemblies
  • Electrical Penetrators & Sensors
  • Hoses
  • Subsea Electrical Components

Favoured by many blue-chip companies in the Energy sector such as Siemens Subsea, Sonardyne and Seacon. We have supplied a 1.8m x 7m bore pressure vessel, with an actuated chock closure; developed specifically for testing full-size subsea flexible riser buoyancy modules or DBMs. This remains one of the largest pressure vessels of its type in the world; with such an innovative,  quick and easy closure system.

Please follow the link below to see our designed and manufactured Actuated Chock Closure Pressure Vessel with integrated Pressure Control System for Sonardyne’s Hydrostatic Pressure Test Facility https://www.sonardyne.com/product/hydrostatic-pressure-testing-facility

Project Examples

Pressure vessel for testing subsea sonar equipment and technology
Pressure testing sonar technology and equipment

A pressure vessel used to validate the integrity of subsea equipment, instruments and systems simulating ultra-deepwater operating environments.

  • Pressure rating: 630 bar
  • Size: Ø760mm x 2000mm depth
  • Temperature: -10°C to +50°C
  • Volume: 910 litres

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Pressure Vessel for qualification testing distributed and drill riser buoyancy modules
Pressure vessel for testing Distributed and Drill Riser Buoyancy Modules

A pressure vessel used for the hydrostatic testing of distributed buoyancy module products for the subsea, deepwater oil and gas sector.

  • Pressure rating: 475 bar
  • Size: Ø1800mm x 7400mm depth
  • Temperature: 0°C to +50°C
  • Volume: 17,800 litres

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Pressure vessel testing subsea electrical connectors
Pressure vessel for testing subsea electrical connectors

A pressure vessel used for production testing subsea electrical connectors for the deepwater oil and gas sector.

  • Pressure rating: 450 bar
  • Size: Ø100mm x 200mm depth
  • Temperature: Ambient
  • Volume: 1,380 litres

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