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Problem Solving Forum (14)


Under what circumstances is third-party inspection justified on commercial coating work?


If you’re performing a QA inspection as a part-time consultant and the surface in question was blasted and painted two days before you arrived on-site, should you sign off on the work if the owner asks you to?


On guardrails on a marine wharf, grating panels consisting of mild steel bars about 1/8-inch by 1-inch on a 2-inch-square grid were painted with a three-coat zinc/epoxy/urethane system. Inspectors are finding numerous pinholes in the finish coat along the inside corners of the grating where the 1-inch-thick bars meet at a 90-degree angle. These pinholes were not noticed in the zinc or epoxy coats, but the final coat's visual inspection is more detailed. What is the likely cause of the pinholing, and what could be done to prevent it on future applications? Also, what should the disposition of the parts with pinholes be, as in, repair, accept as is, reblast and recoat, or an alternative?


Some specifications may have requirements that the inspector may know to be extraneous or may be more restrictive than necessary to obtain a quality coating application. What is the ethical responsibility of the inspector to reject non-conforming coatings that they know will perform as intended, particularly where attempted repairs may degrade the coating system?


What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?


What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?


When performing maintenance surveys on structures that require coatings under insulation, how do you inspect the condition of the coatings?


When performing maintenance surveys on structures that require coatings under insulation, how do you inspect the condition of the coatings?


In what circumstances is third-party inspection recommended for commercial coating work?


Under what circumstances is third-party inspection justified on commercial coating work?


Is it practical to use black light to check for dirt or other foreign matter during surface preparation inspection?


What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?


As an engineer in a moderate-sized chemical plant, how can I justify the cost of third-party inspection to upper management?


What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?


 
 
   

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N.T. Ruddock Co.

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RBW Enterprises, Inc.
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