High Pressure Testing Systems with Manual Chock Closures

  1. Home
  2. Products
  3. Pressure Vessel Closures
  4. Manual Chock Closure Pressure Vessels

Our KW Designed Solutions designed and developed manual chock closure high pressure testing vessels provide continues to provide our customers with a closure that has been innovatively engineered; providing 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. This allows the robust closure to be locked and unlocked in a matter of minutes, helping to improve efficiency and reduce operator fatigue.

When fully assembled, the chock ring is self-locking. This provides a sound mechanical safety feature, preventing the 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, fitting into facilities where this may be a restriction. Used in the vertical orientation these vessels have a minimal footprint; taking up little shop floor space whilst still allowing simple fitment of slim heating and cooling jackets.

Due to its 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 High Pressure Testing Vessel


  • Closure Time: From 3 minutes to 5 minutes
  • Materials of Construction: Stainless Steels, Carbon and Alloy Steels
  • Multi-Penetration Closure
  • Pressure Rating: 100 bar to 700 bar
  • Seal Type: O Ring with PTFE back-up ring.
  • Size: Between Ø400mm to Ø750mm Bore and Depths of 800mm to 2500mm
  • Temperature: -20°C to 200°C
  • Volumes: 100 litres to 1000 litres


  • Custom Size and Pressure Range Available to Meet Specific Requirements
  • Easily Identifiable Chocks; Colours and Numbers Ensure Correct Sequence to Prevent Accidental Opening
  • Long Service Life
  • Low Maintenance Requirements
  • Multiple Penetrations for Tooling, Electrical Feed-Through and Pressure Control Hardware
  • Plug Guidance for Larger Closures
  • Semi-Quick Acting Opening and Closing Times: 2 Minutes to Open/ Close, 2 to 5 Minutes to Lock/ Unlock
  • SWL Rated Closure for Attachment of DUT (Device Under Test) – Reducing the Need for Separate Handling

Applications and Customer Uses

Our manual chock closure pressure vessels are a popular choice for our customers within the energy and subsea sectors. The simple and ergonomic design of the chocks make this closure a more favourable manual method, when compared to bolted closures that require heavy duty bolting.

Typically, this type of pressure vessel is used for FAT or production testing of subsea electrical components, hoses, cables, feed through penetrators and subsea Flexible Riser Buoyancy Modules or Distributed Buoyancy Modules, in line with API16F and API17L.

Please follow the link below – designed, manufactured, installed and commissioned manual chock closure vessels at the Balmoral Offshore Subsea Test Centre in Aberdeen.


Manual Chock Closure Pressure Vessels Enquiry

Please get in touch with us using the form to enquire about our manual chock closure pressure vessels.

Fill out this field
Please enter a valid email address.
Fill out this field
KWDS - Resources Brochure Thumbnail - Manual Chock Closure Pressure Vessel

Manual Chock Closure Test Chamber Project Example

Pressure vessel for testing subsea Distributed Buoyancy Modules

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

  • Pressure Rating: 600 bar
  • Size: Ø500mm x 2500mm depth
  • Temperature: 0°C to +100°C
  • Volume: 490 litres
Pressure vessel testing distributed buoyancy modules