Materials Performance Supplements

TANK 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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Page 24 of 31

25 TANK CORROSION CONTROL SUPPLEMENT TO MP MATERIALS PERFORMANCE MAY 2018 Justin Rig B y, P R inci P a L , Remedy Asset Protection Coating Inspection: Great Responsibility with Little Power Being a coating inspector is a rewarding career where we can share our experiences and provide the coatings industry with bet- ter quality and durability outcomes. This is especially true when we are supported by interested owners who ensure our position has authority and when the description of the work is detailed in specifications. However, the industries we serve con- sist of construction and maintenance proj- ects that have many intermediaries and specific time constraints. Often, we find our services being engaged at the last minute when all the project plans and program- Tank Protection Articles ming have already been fixed. Even more diffi- cult is when our ser - vices are engaged as an add-on or afterthought where we must tr y to catch up to the work schedule while tr ying to educate the team as to the importance of our role. Often, in these situ- a t i o n s , t h e p r o j e c t team has not realized the importance of the paint specification. So what are some tricks of the trade to get the job done right? Authority and Workmanship You as the coating inspector have very lit- tle authority unless you have a communication line directly to an inter- ested asset owner. The best defense is a subtle of f e n s e . I w i l l of t e n describe my position as having little author- ity, meaning I can't stop the job to prevent poor workmanship; however, my report is a reflection of the workmanship performed. Therefore, if the applicator is doing an out- standing job, my report will be a glowing reference of such work. If I encounter many quality problems, my report will be long and descriptive, and it will reflect poorly on the project team. An example of such a situation was when I was inspecting prefabricated steel panels for tank wall plates. I was perform- ing an inspection of the primer coat while, without notification, the applicator was preparing to apply an intermediate coat over an inorganic zinc (IOZ) silicate. When I realized that he was mixing paint, I per- formed a test to check the cure of IOZ in accordance with ASTM D4752, 1 "Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub." I found the primer to need further cure. So with a full kit of epoxy already mixed, the applicator turned to me with a cheeky grin and said, "It will be alright if I just blow this kit out though?" He didn't want to waste the kit and instead wanted to use it by spraying it over the uncured IOZ. My response was simply, "I can't stop you from applying that kit, but it will be recorded in my report as a nonconformance, and the client will need to provide approval ." It seems that he must have thought about the barrage of emails and explanations required because in the end he decided to sacrifice the mixed kit. There are many standards and test methods we are asked to use that don't always ensure good workmanship, and it takes a keen inspector to identify areas of potential for poor-quality outcomes. I had another project where I was the client's only representative. The applicator was asked to verify surface cleanliness in accordance with ISO 8502-3, 2 "Preparation of Steel Substrates Before Application of Paints and Related Products—Tests for the Assessment of Surface Cleanliness—Part 3: Assessment of Dust on Steel Surfaces Pre- pared for Painting (Pressure-Sensitive Tape Method)." The test is to be completed every 50 m 2 (538 ft 2 ); therefore, the applicator supplied four tape samples for a 2,000 m 2 (21,528 ft 2 ) tank f loor. When I performed my inspection, I found a fine powdery layer of spent garnet over a dark-colored holding Photo courtesy of Justin Rigby.

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