PROTECTION OF DISTRICT HEATING SYSTEM
Industry: Power (POWR)
Application: VPF-Valves, Pipes and Fittings (VPF)
Customer Location: Electricity utility, Sweden
Application Date: September 2009
Belzona® 5851 (HA Barrier)
Belzona® 5831 (ST Barrier)
Problem: Corrosion on feed and return pipes as well as on supporting steelwork. System is in continuous use so products capable of application to hot surfaces required.
- District heating Chamber before renovation
- Dry ice blasting
- Coating being applied
- The finished application
Access chamber (5 x 5m) to district heating pipework.
Application was carried out in accordance with a modified version of Belzona Know-How System Leaflet VPF-2. Initially dry ice blasting was done to remove soil, oil and loose corrosion. Then two coats of the products were applied; Belzona® 5831 to supports and drainage pipe, Belzona® 5851 to feed-pipe & Belzona® 5841 to return pipe.
Despite the limited amount of surface preparation together with the application being done in-situ and with the heating system in continuous use, cost effective long term corrosion protection could be provided using the individual Belzona products selected for the individual surface conditions/temperature. The client expressed his satisfaction with the appearance of the application when inspected after 2 years service.