This technical information paper contains guidelines and describes quality evaluation procedures for field
application of metallic thermal spray coatings that are applied for corrosion protection in pulp mill process vessels such as batch digesters, continuous digesters, flash tanks, evaporators, and concentrators. Many other thermal spray coatings, including metallic coatings for protecting recovery boiler tubes against corrosion, restoring Yankee dryer surfaces, hard-surfacing calendar rolls, and ceramic coatings used on various paper machine rolls are not covered by this document; although the basic, coating-related information and qualification procedures described herein apply to those coatings as well.
These guidelines inform equipment owners and mill engineers of the properties a thermal sprayed coating
should have for the coating to perform adequately in service. Issues to address and items to include in a job
specification are listed. Coatings are only generically described. No recommendations are provided for either types of coating or materials for specific applications.
