The Ortviken, Sweden, paper mill is SCA’s largest with a production capacity of 850,000 tonnes/yr on four paper machines. The mill produces high-quality, light weight coated (LWC) and newsprint papers that are certified in accordance with the standards of the Forest Stewardship Council (FSC).
The circulation and reuse of white water is of critical interest in the paper industry, Fig. 1. Environmental regulations require paper mills to perform much more efficient water management than in the past.
Maximized reuse of every water stream in the paper mill (especially white water) led to serious corrosion problems in some of the paper manufacturing equipment at the Ortviken mill. Several decades of research helped to achieve very high levels of corrosion protection, mainly due to new construction materials. Common use of dedicated stainless steels and corrosion-resistant alloys strongly minimized general corrosion problems in paper production. Unfortunately, there is still the problem of localized corrosion (pitting), which rises as water reuse level increases. Corrosion-resistant alloys and/or stainless steel under specific conditions can result in increased chemical concentration used for paper manufacturing and bleaching that can lead to stress corrosion and potential damage of rotating equipment.
Honeywell and SCA worked together to determine
the best way to assess corrosivity in the white water
stream, considered one of the main corrosion
hazards in the paper mill. To detect
real-time corrosion incidents
Honeywell proposed using its
One Wireless SmartCET®
corrosion monitoring
transmitter. The corrosion
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