KHIA headerKnow-How in Action


Belzona® Rectifies Leakage Problem In A Bioreactor Clarifier



Petrochemical (PETR)



Tanks and Chemical Containment Areas (TCC)


Customer Location:

Petrol Refinery in Thailand


Application Date:

January and February, 1996


Application Situation:

Steel bioreactor clarifier tank 100' diameter (31m) with a concrete bottom, split into six segments



Bottom of the tank had to be made waterproof and an expansion joint incorporated where the concrete floor meets the steel tank wall.



Belzona® 5811 (Immersion Grade)

Belzona® 4111 (Magma-Quartz)

Belzona® 2221 (MP Fluid Elastomer)



Concrete and Steel


Application Method:

Application carried out in accordance with Belzona® Know-How Leaflets TCC-9, TCC-11, TCC-12 and TCC-15


Belzona Facts:

Replacement of the tank was too expensive even to consider. Other options that were considered included using a glass flake system to coat the tank and welding a steel bottom onto the walls of the tank. The cost of this method would have been about £370,000. The Belzona® solution cost only £80,000, a saving of almost £300,000, and took a fraction of the time estimated for the welded repair.


Photographs Description

  1. Concrete being repaired with Belzona® 4111   
  2. First coat of Belzona® 5811 being applied   
  3. Expansion joints masked off and pouring of Belzona® 2221 commenced
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


For more information about Belzona visit: