High-quality painting of piping, equipment and structures, is essential to prevent corrosion. It helps ensure the longevity of a constructed installation and low maintenance costs.
Industrial Equipment can be complex and confusing, with a variety of materials, from metal to plastic, and a variety of purposes.. heating and cooling, water, sprinklers, etc. Many of these equipment need to be painted according to strict color codes and laws.
The different types of materials call for different types of paint, and processes of application. Performance Painting Contractors offers a wide variety of different paints, coatings, and more to protect equipment systems.
Implementing corrosion protection for a facility all starts with one important document.. a paint specifications sheet.
Well written paint specifications contain exactly as much detail as they need to make expectations clear and no more. Industrial coatings are more complex than they used to be, and paint specifications need to reflect that complexity.
Paint specification for a project is provided by the customer. Engineering firms can use their own standard paint specifications if allowed by the client.
Adhesion of the film on the surface is the key to coating effectiveness. Proper surface preparation enhances adhesion of the film to the surface. When coating a surface prepared by blasting, the real issue is not time.. the key criterion is that the steel temperature shall always be at least 3°C (5°F) higher than the calculated dew point. This safety margin is sufficient for all types of coatings. Consideration of factors such as time, temperature, and humidity must be the responsibility of the inspector.
Source for the article below comes from HMG Paints
The effective life of a coating of anti-corrosive paint applied to a steel surface is to a very large extent dependent on how thoroughly the surface has been prepared prior to painting. It is also important to be able to specify clearly the quality of preparation required in each particular case.
Accordingly, a Standard has been approved, specifying four grades of rusting and a number of preparation grades, each establishing a quality grade or preparation prior to protective painting required on a steel surface in a standard rust grade. These grades are presented in this Standard as a series of prints, which provide a clearer and more rapidly appreciated definition than a verbal description.
The standard has been prepared by the Swedish Corrosion Institute in cooperation with the American Society for Testing and Materials, ASTM, and Steel Structures Painting Council, SSPC, USA. In the specifications relating to preparation of surfaces prior to painting, the SSPC and SIS designations correspond as follows..
|SSPC-Vis 1||SIS 05 59 00|
|SSPC-SP5||A Sa 3, B Sa 3, C Sa 3, D Sa 3|
|SSPC-SP10||A Sa 2.1/2, B Sa 2.1/2, C Sa 2.1/2, D Sa 2.1/2|
|SSPC-SP6||B Sa 2, C Sa 2, D Sa 2|
|SSPC-SP7||B Sa1, C Sa 1, D Sa 1|
This standard refers to surfaces of hot-rolled steel in four different rust grades (A, B, C and D) the same surfaces prepared to two grades of surface quality (St 2 and St 3) by manual scraping and wire-brushing - machine brushing - grinding-etc. The same surfaces prepared to four grades of surface quality (Sa 1, Sa 2, Sa 2.1/2 and Sa 3) by blasting with various abrasives.
Examples.. A steel originally corresponding to rust grade B, which has been scraped or brushed to preparation grade 2 is designated B St 2. A steel surface originally corresponding to rust grade B, which has been prepared by blast cleaning to preparation grade 2.1/2 is designated B Sa 2.1/2.
The standardized rust and preparation grades are defined by colour prints representing full scale view of a part of a surface.
Source for the article below comes from Performance Painting
All above-ground, underground, and underwater piping systems need a protective coating that can help prevent rust and corrosion. Over the years, innovative products have been developed to address the issue of rust and corrosion in pipes due to different environmental factors, ranging from elevated temperature, moisture, and salinity levels to acid rain and chemicals.
Top Considerations for Choosing Protective Coatings
Before looking into the protective coating formulations available today, it's essential to know that professional painters consider two aspects when choosing a paint system..
These two factors will dictate the type and level of surface preparation, the type of paint that will be used, the thickness of the paint film, and recoating intervals. In corrosive environments, the surface preparation and coating operations must be carefully performed and recoating intervals strictly monitored.
External Protective Coatings for Piping Systems
Today, you can find a wide variety of coatings that can ensure long-term protection of piping systems. They're divided into nine distinct categories..
Also read.. ASTM - Paint and Coating Standards