BELZONA ON EVAPORATOR TUBE SHEETS
Industry: Pulp & Paper (PLPR)
Application: HEX-Heat Exchangers (HEX)
Substrate: Stainless steel tubes and mild steel tube face.
Customer Location: Pulp & Paper Mill - British Columbia, Canada
Application Date: 1994
Problem: Erosion / corrosion of the tube sheet due to hot caustic black liquor at approximately 185ºF and galvanic corrosion between the stainless steel tubes and mild steel tube face.
- View of tube sheet showing erosion.
- Application of Belzona® 1391 via injection pistol to top tube sheet. Product was brushed into place around tubes and allowed to flow level.
- Tube sheet inspection of Belzona® 1391 after 2 years in service.
Evaporator tube sheet.
Application was carried out in accordance with a modified version of Belzona Know-How Leaflet HEX-1.
Belzona has been providing protection for evaporator tube sheets at this mill since April 1992. All three applications are still in service. The first application utilized Belzona® 1321, and while the coating has now since eroded away the Belzona product is still adhering in the "grooves" around the tubes, reducing erosion in this area dramatically. The application is scheduled to be refurbished. The other two applications are just short of 3 & 4 years old respectively. A fourth application (new) is planned.