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Belzona® Seals Flange On Vacuum Dryer



Food & Drink (FOOD)



Valves, Pipes and Fittings (VPF)


Customer Location:

Food Process, Girvan, Scotland


Application Date:

November 2015


Application Situation:

A large diameter (approximately 2m) flange on vacuum drying vessel.



A leak around the flange had developed, preventing a vacuum to be accurately maintained within the vessel. This was affecting the drying process and production. A solution to seal this leak around the flange was required without dismantling the equipment. When the vessel is in operation it runs at elevated temperatures.



Belzona 5851 (HA-Barrier)

Belzona 9341 (Reinforcing Sheet)



Mild steel


Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflet VPF-11 while the vessel was running at temperature. The surface temperature was maintained at 90 to 110°C. After preparing the substrate, Belzona 5851 was applied as a 3 coat system in conjunction with Belzona 9341. By drawing a vacuum from within the vessel, the Belzona 5851 material was actually pulled into the void areas before curing off. This ensured all the leak areas were attended to and sealed.


Belzona Facts:

Disassembly of the vessel would have been very difficult and time consuming. The Belzona solution was carried out in one day with minimal disruption to the plant workings around the area.


Photographs Description

  1. Vacuum vessel
  2. 1st coat of Belzona 5851 applied with Belzona 9341
  3. Application in progress
  4. Completed flange seal
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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