Bolted closures are the most popular closure design specified in pressure vessels. They are a more traditional method, compared to the quick-access range of closure types available but are still a good choice, as they are relatively low cost.

They are easy to handle, simple to operate and their minimal design provides great flexibility; allowing the customer to configure the equipment to their individual project needs.

Various types of seal solutions can be fitted, to suit the application requirements. These include low-cost standard rubber O rings; more complex bespoke engineered plastic seals and even metal to metal type sealing solutions (such as BX rings or C-rings.)

KW Designed Solutions bolted closure pressure vessels are supplied with operating pressures of up to 2069 bar and temperatures ranging from -196°C to +650°C.

Bolted closure


  • Materials of Construction: Stainless Steels, Exotic Steels (Hastelloy, Inconel), Carbon and Alloy Steels
  • Multi-Penetration
  • Opening/ Closing Times: From 5 Mins to 1 Hour Depending on Size and Number of Bolts (Bolt Tensioning Devices Are Available for High Torque Applications)
  • Pressure Ratings: 6 Bar to 2069 Bar
  • Seal Types: O Seals, PTFE, Gaskets, Metallic Seals (BX Rings, C-Rings)
  • Size: Between Ø50mm to Ø1000mm Bore and Depths of 100mm to 2000mm
  • Temperature: -196°C to 650°C
  • Volumes: 0.25 Litre to 1500 Litre


  • Can be Supplied with any Type and Size of Port Configuration, Dip Tube or Thermowell
  • Ideal for Smaller Bench-Top Applications
  • Low-Cost Manufacture
  • Robust Sealing Solution When Correctly Specified for Application
  • Simple and Easy to Use
  • Valves and Fittings

Applications and Customer Uses

Our bolted closure pressure vessel is a popular choice with customers who work within the scientific, materials testing and research industry.

To provide the confidence that the vessel will remain pressurised, for the entire duration of demanding testing applications; we utilise torqued up bolts and clamp the closure seal.

The bolted closure is typically associated with reactor pressure vessels and autoclaves; providing a robust sealing solution. This gives the customer the ability to conduct high elevated temperature testing, for durations of up to and over 3 months, where immediate access to the vessel is not required.

Bolted Closure Pressure Vessel Enquiry

Get in touch with KW Designed Solutions for all bolted closure pressure vessel enquiries.

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Project Examples

Pressure vessel for testing subsea electrical connectors

This pressure vessel is configured horizontally and used to conduct qualification testing and production FATs on electrical and fibre-optic connector systems, for subsea power and communications.

  • Pressure rating: 550 bar
  • Size: Ø617mm x 6000mm long
  • Temperature: -10°C to +200°C
  • Volume: 1800 litres
Pressure testing system for conducting qualification and production testing electrical and fiber-optic connector systems, for subsea power and communications.
pressure testing wellhead pressure and temperature sensors

Pressure testing wellhead pressure and temperature sensors

We designed and manufactured this pressure vessel containment rig, to optimise the throughput of wellhead pressure and temperature sensor production testing.

  • Pressure Rating: 2069 Bar
  • Size: Ø57mm X 350mm Depth
  • Temperature: Ambient
  • Volume: 4 Litres

Pressure vessel testing subsea valve seals

Designed for hydrostatic pressure testing of a 20” NB face seal for use in subsea valves.

  • Pressure Rating: 525 Bar
  • Size: Ø57mm X 350mm Depth
  • Temperature: -10°C to +50°C
  • Volume: 4 Litres
hydrostatic pressure testing system for testing 20” NB face seal for use in subsea valves