Product Detail:
This document provides guidelines and describes quality control and testing
procedures for application of either stainless steel or nickel-base corrosion
resistant weld metal overlay (hereafter referred to as CRO) on internal surfaces
in continuous digesters, impregnation vessels, and batch digesters in kraft and
soda service. These guidelines provide information concerning overlay properties
and application procedures that affect the performance of the overlay.
The scope for CRO in digester vessels should specify
the:
• Area to be overlaid.
•Welding materials to be used.
• Surface preparation required.
• Criteria for deciding where it is necessary for buildup or repair of the
substrate, and detailed procedures for this.
• Jurisdictional regulations and applicable Codes to be complied with.
• Procedure documentation. • Work-product documentation required.
• Quality control and testing plan.
• Safety and job support requirements (scaffolding, ventilation, power
supply).
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