KHIA headerKnow-How in Action


Belzon Seals The Manway Flange Of A Heater Treater



Oil & Gas (OILG)



Valves, Pipes and Fittings (VPF)


Customer Location:

Gulf of Mexico


Application Date:

March 2015


Application Situation:

Two Heater Treater 24" manway flanges not sealing properly.



After years of service, the manway flange sealing surface was pitted/deteriorated and was not sealing properly. The customer needed a repair system that could restore the sealing surface of the manway flanges without hot work, which would cause unwanted downtime.



Belzona 1111 (Super Metal)

Belzona 9111 (Cleaner Degreaser)

Belzona 9411 (Release Agent)



Carbon Steel


Application Method:

The flange face forming repair was conducted in accordance with Belzona Know-How System Leaflet VPF-17. The receiver flange was prepared by grit blasting and a polyurethane template was machined to specifications and coated with Belzona 9411. It was allowed to dry and a layer of Belzona 1111 was installed on the template and receiver flange. Then, the template was bolted to the receiver flange for two hours, allowing Belzona 1111 to cure. The template was then removed and the receiver flange cleaned and dressed.


Belzona Facts:

The Heater Treater had been taken out of service by a regulatory agency due to leaking flanges. Replacement of the two manway flanges required hot work and extended downtime. The Belzona Flange Face Forming system did not require hot work, eliminating downtime and production loss.


Photographs Description

  1. View of pitted/damaged flange face.
  2. Belzona 1111 applied to receiver flange after grit blasting, and to machined area of template.
  3. Template bolted to receiver flange.
  4. Application complete - reformed flange face ready for service.
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


For more information about Belzona visit: