The KW Designed Solutions threaded closure pressure vessel, utilises a two-piece closure system, which consists of a plug and captive lock ring. They are an economical alternative to our range of quick-acting closures and are generally specified for small to medium sized pressure vessels.

The closure is easy to handle, safe, reliable and robust in operation. It incorporates a unique smooth-form thread and low friction coating, that allows effortless opening/ closing of the vessel, without tooling. This provides the operator with quick and easy access into the pressure vessel if required; offering many advantages over a typical bolted closure.

The threaded closure allows low cost elastomeric o-rings, back-up ring combinations or engineered plastic seals to be fitted; rather than metal to metal seals. Thus, making service and maintenance cheaper and the pressure vessel more cost-effective.

These vessels require minimal shop floor space, as they are used in a vertical orientation. With the incorporation of a vessel and closure support frame, they can be supplied horizontally; ensuring closure alignment is maintained with the vessel body.

Pressure Vessel system with a threaded closure used for High Pressure High Temperature (HPHT) testing, researching and developing subsea power and control technologies and testing underwater positioning transponders and transceivers


  • Material of Construction: Stainless Steels, Exotic Steels (Hastelloy, Inconel), Carbon & Alloy Steels
  • Pressure Ratings: 50 Bar to 3000 Bar
  • Seal Types: O-Ring & Back-Up Ring, PTFE, Spring Seal, Bespoke Design
  • Size: Ø25mm to Ø400mm Bore & Depths Of 50mm to 2.5m
  • Temperature: -50°C to 250°C
  • Vessel Configuration: Vertical or Horizontal with A Single Closure & Blind Bore or With Dual Closures
  • Volumes: 50 Millilitre To 250 Litre


  • Low Cost
  • Opening & Closing From 1 Minutes To 10 Minutes Depending on Size & Pressure Rating
  • Quick & Easy Access into Pressure Vessel Without the Need for Tooling
  • Sealing Elements Easy to Service & Maintain
  • Smooth-Form Thread & Low Friction Coating Helps to Drive Seal into Place with Minimal Effort & Wear

Applications & Customer Uses

Threaded closure pressure vessels are popular in industries where a simple and economically priced vessel is required, that allows relatively quick and easy access.

Customers in the energy and subsea sectors use threaded closure pressure vessels for product verification, Factory Acceptance Testing (FAT) and production testing of subsea electrical components, hoses, cables, penetrators and valve seal arrangements.

The closure is a popular choice with customers from scientific and material research industries; working at pressures up to 400 Bar at 200°C and those who require smaller bench top reactor vessels. These can be 50ml to 1 litre; for use in laboratories, working at pressures up to 200 bar at 250°C.

Project Examples

Autoclaves designed for carrying out long term high pressure and high temperature corrosion testing
Autoclaves designed for HPHT corrosion testing

Autoclaves are used for carrying out long-term corrosion testing on clients test samples. Tests conditions are generally High Pressure High Temperature (HPHT) testing, using various media:

  • Pressure Rating: 440 Bar
  • Size: Ø192mm X 300mm Depth
  • Temperature: 0°C To +200°C
  • Volume: 10 Litres

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Pressure testing system designed for researching and developing deepwater subsea power and control technologies
Pressure vessel for subsea power systems research and development

This special purpose pressure vessel allows in-house testing to be conducted. Produced for a joint industry project (JIP), to develop deepwater subsea power and control technologies, to aid the development of next-generation subsea power systems.

  • Pressure Rating: 550 Bar
  • Size: Ø300mm X 600mm Depth
  • Temperature: -40°C to +200°C
  • Volume: 42 Litres

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pressure vessel for hydrostatic testing underwater positioning transponders and transceivers
Pressure vessel for testing underwater positioning transponders and transceivers

Special purpose pressure vessel for hydrostatic testing underwater. Positioning transponders and transceivers are used for the accurate positioning and location of subsea equipment, both towed and autonomous, subsea cable and pressure housing assemblies.

  • Pressure Rating: 490 bar
  • Size: Ø350mm x 1400mm depth
  • Temperature: Ambient
  • Volume: 140 litres

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