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Equipment 2018

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Page 30 of 35

COATINGSPRO EQUIPMENT 2018 31 For nominal DFTs, individual values <80 percent of the nominal thickness are not acceptable. Values between 80 and 100 percent are acceptable provided that the overall average (mean value) is equal to or greater than the nominal value. On-Site Quality Control Inspection Inspection forms an integral part of quality control. Its purpose is to ensure that the project complies with the requirements of the specification and to provide the client a report with proper records. One of the greatest assets for the coating inspector is a clearly written specification that can be referred to without doubt. e appointment of an appropriately qualified inspector should be seen as an investment in quality and not just an additional cost. Inspection of the processes, procedures, and materials required for the protective coating of steel structures is vital since a major error in even one operation cannot easily be detected after the next operation has been completed; and, if not rectified immediately, it can significantly reduce the expected service life of the coating. Practical Scenario — A Case History During an engineer procure construct project, the specification allowed two types of painting application (spray as well as brush). e stakeholder thoroughly analyzed the environment, application method, and special require- ments before starting the process. A detailed specification for the roller method was developed to ensure quality and durability, which resulted in a 20 percent savings of paint toward the loss factor. e entire structure was coated by roller application (see Figure 1). Conclusion e overall success of a protective coating scheme can be influenced by many factors. A well-prepared specification document is an essential component that is intended to provide clear and precise instructions to the coating contractor and inspector on what is to be done and how it is to be done. It should be drafted by someone with appropriate techni- cal expertise, and it should be clear as to what is required in terms of what is practical and achievable. CP R. Prasanna is the deputy general manager — QMS at Essar Projects (India), Ltd., Amritsar, Punjab, India. He has been involved with minerals and metals projects for two decades, with emphasis on coatings and corrosion engineering. He has developed programs to analyze paint consumption and calculate requirements. He is a mentor for young professionals in American Society of Mechanical Engineers (ASME) in India and the United States. He is a certified professional in American Society of Nondestructive Testing (ASNT), a Chartered Engineer, lead auditor — QMS, internal auditor — IMS, and is a NACE-certified Coating Inspector Level 1. He has published two other articles about coatings and humidity factors in MP and is a member of NACE International. For more information, contact: R. Prasanna, is article originally appeared in the June 2017 issue of Materials Performance and is reprinted with permission. Figure 1. The structures pictured consist of the charging crane, cooling chamber, boiler, and primary dust catcher of the coke dry quench (CDQ) system. Photo courtesy of Tata Steel– Kalinganagar–Orissa–India. Specification and Inspection

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