We have designed, manufactured and supplied numerous sight glass window pressure vessels, to Universities and Research institutions. They are especially beneficial as you can easily view the internals of the vessel, enabling this to aid the testing strategy.

Glass, sapphire or quartz windows provide superior optical clarity and are also suitable for high pressure and high temperature. 

We incorporate pressure rated flanges, into the design, to ensure that the windows are safely secure. They are positioned strategically around the vessel, to enable the correct view point.

Neatly integrated fan type agitators, create an even temperature distribution or adequate mixing of gases, prior to commencing or whilst during tests.

Vessels are manufactured from 316SS materials and rated for operating pressures of up to 150 bar and temperatures up to 250°C. Higher temperatures can also be achieved, with the addition of cooling facilities, applied to the window port and flange design.

Pressure vessel with sight glass windows used in Universities and research institutions laboratories to be able to observe activity within the pressure vessel whilst testing


  • Material of Construction: Stainless Steels, Glass, Sapphire, Quartz
  • Pressure Ratings: Up To 150 Bar
  • Seal Types: O-Rings, Gaskets, PTFE, Graphite,
  • Size: Between Ø25mm to Ø400mm Bore & Depths of 50mm to 2000m
  • Standard ASME B16.5 Class Flanges Available
  • Temperature: -20°C to 250°C
  • Volumes: 50 Ml Litre to 250 Litre


  • Bespoke Design for Customer’s Specific Requirements
  • Ideal for Fuel Spray & Atomisation Testing
  • Integrated Viewing Windows Ensure Compact Design Yet Maximum Optical Clarity
  • NACE MR0175/ISO15156 Compliant
  • Viewing & Inspection of Test Environment

Applications & Customer Uses

Sight glass window pressure vessels are a specific choice for customers, who’s projects are involved in the investigation of fuel spray performance and atomisation testing. 

KW Designed Solutions have also supplied diesel injector test rigs to Universities to carry out performance related inspection of diesel fuel combustion; where a high pressure, high temperature testing environment is maintained.