Sight Glass Window Pressure Vessels

We have designed, manufactured and supplied numerous Sight Glass Window Pressure Vessels to Universities and Research institutions where there is a requirement to view the internals of the Vessel as part of the testing activity.

Glass, sapphire or quartz windows ensure superior optical clarity whilst also being rated for high pressure and temperature.  Pressure rated flanges are incorporated into the design to safely secure the windows, strategically positioned around the Vessel to ensure correct viewing is achieved.

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

Neatly integrated fan type Agitators create even temperature distribution or adequate mixing of gases prior to or during tests.

Sight Glass Window Pressure Vessels


  • Pressure ratings: up to 150 bar
  • Temperature: -20°C to 250°C
  • Size: Between Ø25mm to Ø400mm bore and depths of 50mm to 2000m
  • Volumes: 50 ml litre to 250 litre
  • Seal Types: O-Rings, gaskets, PTFE, Graphite,
  • Material of construction: Stainless steels, Glass, Sapphire, Quartz
  • Standard ASME B16.5 class Flanges available


  • Viewing and inspection of test environment
  • Bespoke design for customer’s specific requirements
  • Ideal for fuel spray and atomisation testing
  • NACE MR0175/ISO15156 compliant
  • Integrated viewing windows ensure compact design yet maximum optical clarity

Applications and Customer Uses

Sight Glass Window Pressure Vessels have been a specific choice for our customers involved in the investigation of fuel spray performance and atomisation testing.  KW Designed Solutions have 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.

Project Examples

Project examples to follow

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.