Manual Chock Closure Pressure Vessels

The KW Designed Solutions Manual Chock Closure Pressure Vessel provides the end user with a closure that has been innovatively engineered as an alternative to the bolted closure for medium sized pressure vessels.

The closure plug is retained by a set of ergonomically designed, segmented chocks that the operator can easily handle, allowing the closure to be locked and unlocked in a matter of minutes.  It is robust in design whilst helping to improve efficiency and reduce operator fatigue.

On full assembly, the chock ring is self-locking; providing a sound mechanical safety feature that prevents accidental removal of any of the segmented chocks.

The compact nature of the Manual Chock Closure allows the body of the pressure vessel to be shorter in height, providing the benefit of fitting into facilities where height may prove a restriction.  Used in the vertical orientation these vessels also have a minimal footprint, taking up minimal shop floor space whilst allowing simple fitment of slim heating & cooling jackets.

Due to this type of pressure vessels simplicity, only the closure plug requires handling with an overhead hoist system during opening and closing.  However, with the closure plug typically being of a similar weight to the DUT being hoisted in and out of the pressure vessel, it allows for the installation of a hoist with a low to moderate lifting capacity. 

Manual Chock Closure Vessels


  • Pressure rating: 100 bar to 700 bar
  • Temperature: -20°C to 200°C
  • Size: Between Ø400mm to Ø750mm bore and depths of 800mm to 2500mm
  • Volumes: 100 litre to 1000 litre
  • Seal Type: O Ring with PTFE back-up-ring.
  • Material of construction: Stainless steels, carbon and alloy steels
  • Multi-Penetration Closure
  • Closure time from 3 mins to 5 minutes


  • Semi-quick acting opening & closing times: 2 minutes to open/close, 2 to 5 minutes to lock/unlock
  • Easily identifiable Chocks; colours & numbers ensure correct sequence to prevent accidental opening
  • 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
  • Plug guidance for larger closures
  • Custom size and pressure range available to meet specific requirements

Applications and Customer Uses

Our Manual Chock Closure Vessel has proved to be a popular choice for our customers within the Oil & Gas and Subsea industry sectors.   The simple & ergonomic design of the chocks makes this closure a more favourable manual method compared to bolted closures requiring heavy duty bolting.

Typically this type of pressure vessel is used for F.A.T. or production testing of subsea electrical components, hoses, cables, feed through penetrators and subsea flexible riser buoyancy modules or (DBMs) in-line with API16F & API17L

Please follow the link below - designed, manufactured and supplied Manual Chock Closure Vessels for Balmoral's Subsea Test Centre.

Project Example

Pressure vessel for testing subsea distributed buoyancy modules

Pressure vessel for testing subsea distributed buoyancy modules (Ref: SO541, Equip No. 2143)

This pressure vessel was developed to carry out qualification and FAT of subsea flexible riser buoyancy modules or (DBMs). 

  • Pressure rating: 600 bar
  • Temperature: 0°C to +100°C
  • Size: Ø500mm x 2500mm depth
  • Volume: 490 litre

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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.