KHIA headerKnow-How in Action


Belzona® Repairs And Protects Leaking Flange On Chiller



Heating, Ventilation & Air Conditioning (HVAC)



Heat Exchangers (HEX)


Customer Location:

Lexington, VA, USA


Application Date:

July 2014


Application Situation:

Chiller had a leaking flange.



A leaking flange on a chiller resulted in the company trying several different products to stop the leak, but to no avail.



Belzona 2121 (D & A Hi-Coat Elastomer)

Belzona 2911 (Elastomer QD Conditioner)

Belzona 9341 (Reinforcing Tape)





Application Method:

The surface was prepared with a grinder to roughen the substrate. Then, the application area was taped off. Belzona 2911 was applied to condition the substrate and allowed to dry. We then used Belzona 2121 in red and stippled in reinforcing cloth over the seam and bolts. We went over and applied a second coat of Belzona 2121 in black. We let it sit overnight and it stopped the leak.


Belzona Facts:

The company tried several times to stop the leak with several different products. The only other alternative was to remove the flange and piping and replace. This would have increased costs and caused several days of downtime.


Photographs Description

  1. Surface preparation to roughen the substrate
  2. Conditioning the substrate
  3. Applying reinforcing cloth over Belzona 2121
  4. Completed application
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


For more information about Belzona visit: