Actuated Chock Closure Pressure Vessels

The KW Designed Solutions Actuated Chock Closure Vessel is equipped with one of our automated quick-acting closures.  The actuated chock closure is an innovatively engineered closure, using hydraulically actuated sliding chocks that lock the closure plug in place.  It is robust in design providing the operator the simplest and quickest opening and closing functionality of the vessel at 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 may prove a restriction.  Furthermore, no manual handling of the relatively heavy chocks is required, they simply retract into the wall of the vessel body when actuated.

With only the closure plug requiring any handling during the opening and closing of the pressure vessel, its relatively low weight and numerous attachment points ensures it can be raised and 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 the vertical orientation, these pressure vessels have a relatively small footprint taking up minimal shop floor space.  If required, the vessel can be provided with its own Closure Handling System, can be installed below ground level or supplied with its own structural safety enclosure.

Actuated Chock Closure Vessels


  • Pressure: 200 bar to 690 bar
  • Temperature: -20°C to 200°C
  • Size: Between Ø500mm to Ø1800mm bore and depths of 1000mm to 7500mm
  • Volumes: 200 litre to 20,000 litre
  • Seal Type: O Ring with PTFE back-up-ring or Springsele®,
  • Material of construction: Stainless steels, carbon and alloy steels
  • Multi-Penetration Closure
  • Multi-Penetration Vessel Body
  • Push button Lock/Unlock with status indication & Integral safety interlock system


  • Guided Closure Alignment System allowing easy and safe operation
  • Quick acting opening & closing times: 2 minutes to open/close, 20 seconds to lock/unlock
  • Rapid, single push button Lock/Unlock functionality
  • Integral Safety Interlock System prevents accidental opening and allows for integration with Pressure Control Systems & Safety Enclosure door locking devices
  • SWL rated Closure for attachment of DUT (Device Under Test) – reducing the need for separate handling
  • Multiple penetrations for Tooling, electrical feed-throughs and pressure control hardware
  • Low maintenance requirements
  • Long service life
  • Custom size and pressure range available to meet specific requirements

Applications and Customer Uses

The KW Designed Solutions Actuated Chock Closure Vessel has proved to be a popular choice for our customers within the Oil & Gas and Subsea industry sectors.   The ease of handling, safe and quick acting features of the closure provide the customer the right choice of design suited for their in-house operating requirements.

Typically the Vessel is used for the F.A.T. and Production Testing of: -

  • Subsea electrical components
  • Hoses
  • Cable Assemblies
  • Electrical penetrators and Sensors
  • Buoyancy products

It has been favoured by many blue chip companies in the Oil & Gas sector such as Siemens Subsea, Sonardyne and Seacon.  Furthermore, KW Designed Solutions have supplied a 1.8m x 7m bore pressure vessel with an actuated chock closure developed for testing full size subsea flexible riser buoyancy modules or (DBM’s).  This remains one of the largest pressure vessels of its type in the world with such a quick and easy to operate 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

Project Examples

Pressure testing sonar technology

Hydrostatically testing subsea sonar equipment (Ref: SO610, Equip No. 2072)

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

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

Click here for more information


Hydrostatic testing distributed buoyancy modules (Ref: SO615, Equip No. 2168)

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

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

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Pressure Vessel Testing Subsea Electrical Connectors

Pressure testing subsea electrical connectors (Ref: SO066, Equip No. 1006-1)

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

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

Click here for more information  

kw designed solutions

Tel: +44 (0) 1257 474 507

KW Designed Solutions Ltd, KW Group, Drumhead Road, Chorley North Business Park, Chorley, Lancashire PR6 7DE. United Kingdom.

Designed and manufactured in the UK Designed and manufactured in the UK.