Читать книгу Corrosion Policy Decision Making - Группа авторов - Страница 25

Paints are very important in CM and its economy due to their high cost. Defects of paint and coating are inevitable. The users are trying to get optimal, long service time for paint systems.

During construction of refineries and industrial complexes, painting of structures and equipment programs is one of the last stages before getting started and commissioning. Managers and workers have a strong wish to get the job done, so painting teams, including contractors, inspectors, executors, and technicians, are under double pressure to complete the job.

Being in hurry leads to neglect of many standard considerations, and the results shorten the life of the paints and lead to their failure. The author and colleagues monitored seven petrochemical centers, two oil refineries, two oil offshore docks, and four gas refineries periodically during four years with emphasis on studying paint damages. Paint problems and solutions are reviewed in this chapter.

Type and size of the abrasive particle are important due to speed of work. Less attention to them may result low surface roughness, sand dirt, and surface contamination due to performing several operations simultaneously. In addition, many other factors contribute to the weakness of the surface preparation and that is one of the main causes of weakness in paints. Collecting atmospheric corrosion data and choosing the right coating system based on corrosion parameters is very important. It also helps in deciding the right time for the painting program.

Proper application of multi‐layered paint systems, consideration the curing times and interlayer times, and observance of the weight balances of paint components and the skill of workers and technicians have led to successive results of long life paints and coating in many industrial projects.

Paint quality control tests almost always need a long duration time. However, managers and executives are in a hurry to start the operation of the units, and this sometimes leads to ignoring some necessary tests, and ultimately leads to using weak paints.

Defects of the paints often appear after the beginning of service. Several field variables play a role in coating defects, and these factors can work separately or intensify each other.