Asset: Onshore Structure, Pipeline
Environmental Characteristic: Below Ground, Brackish Water, High Humidity, Low Humidity
Industry: Pipelines and Underground Systems, Water and Wastewater, Transportation Infrastructure, Maritime, Pulp and Paper
Substrate: Carbon Steel
Cold-Applied Coal Tar Mastic Painting System
This specification covers a cold-applied coal tar painting system for underground and underwater steel structures, consisting of two cold-applied coats. This system is suitable for use on parts or structures exposed in Environmental Zones 2C (fresh water immersion), 3B (chemical, neutral), and 3C (chemical, alkaline). It has fairly good abrasion resistance and is suitable for underground use. It must be used with discretion for immersion in corrosive chemicals since the coating is dissolved by some organic solvents and attacked by oxidizing solutions. The coal tar mastic must be topcoated with coal tar emulsion when exposed to sunlight to prevent checking and alligatoring.