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VOL XXXI, NO 122

Belzona® Seals Valve Leak At Desalination Plant

 
 

Industry:

Water / Wastewater (WATR)

 
 

Application:

Valves, Pipes and Fittings (VPF)

 
 

Customer Location:

Desalination Plant, Australia

 
 

Application Date:

September 2010

 
 

Application Situation:

 Plug and seat valve was leaking. The valves are constructed from saf 2507 super duplex and carry polished seawater (pH 6.9 Temp 17-26 Deg.C) at an operating pressure of 65 bar.

 
 

Problem:

Due to galvanic and crevice corrosion the sealing faces in a plug and seat valve were corroding due to crevice/galvanic corrosion.

 
 

Products:

Belzona 1111 (Super Metal)

 

Substrate:

Super duplex

 
 

Application Method:

Application was carried out in accordance with Belzona System Leaflet VPF-13. Protective sleeves were placed over all cover studs to protect threads.Blank caps inserted inside liner and located just below area to be repaired preventing any damage whilst grit blasting. A company was commissioned to build a machining jig that allowed  the faces to be machined in-situ and then rebuild with Belzona. Other faces of the valves were able to be removed and built up and machined off-site.

 
 

Belzona Facts:

Where other attempts had been unsuccessful Belzona 1111 out-performed everything else. The plug and seat valve was disassembled seven months after the Belzona repair and showed no sign of damage.

 
 

Photographs Description

1. Damage caused by crevice and galvanic corrosion 2. Grit blasted top face and plug 3. and 4. Finished repair with Belzona 1111 applied

 
 
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For more information about Belzona visit: www.belzona.com