What is the standard surface preparation requirement for new surfaces before lining installation?

The standard surface preparation requirement for new surfaces before lining installation is indeed white metal blast cleaning, which is represented as SA3/NACE1/SSPC5. This level of surface preparation is essential to ensure optimal adhesion and performance of the lining material. White metal blast cleaning involves the removal of all rust, mill scale, and old coatings, achieving a clean surface that is free from contaminants.

This rigorous standard ensures that the substrate is appropriately prepared for the application of protective coatings or linings, which is crucial for maximizing the lifespan and effectiveness of the coating system. When surfaces are properly cleaned to the white metal standard, it enhances the physical bond between the coating and the substrate, reducing the likelihood of future delamination or failure.

In contrast, the other methods of surface preparation do not provide the same level of cleanliness or surface profile necessary for effective coating adhesion. For instance, near white metal blast cleaning (SA2.5) and lighter cleaning methods may leave behind microscopic impurities or inconsistent surfaces that could compromise the integrity of the lining installation. Therefore, adhering to the white metal standard is pivotal in the coatings industry, guaranteeing that the conditions for a successful lining application are met.