CoatingsPro Magazine

MAY 2015

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 58 of 92

58 MAY 2015 COATINGSPROMAG.COM On the outside corners of the containment system, the air was monitored using A ndersen total suspended particulate (TSP) samplers. T hese monitors measure the lead particulates in the air. " T hey look sort of like crab pots and are placed at tw ice the height of the structure. T hey monitored the air ever y day that we were blasting or doing anything that produced any sort of dust," said Forakis. Personal pumps, manufactured by Zefon International, were placed on tripod stands at breathing level on all pedestrian walkways. T hat means they were at five feet (1.5 m) off the ground. " T hese pumps have a fine filter and pick up even smaller particles than the TSP monitors. T hey meet NIOSH [National Institute for Occupational Safety and Health] Method 7082 standards and were also worn by the crew inside the containment system during abrasive blasting," said Forakis. Depending on the task at hand at a particular moment, Nova blast hoods, MSA hardhats, Class II safety vests, Guardian fall protection harnesses, 3M respirators, Ty vek suits, and steel-toed boots rounded out the personal protective equipment worn by the crew. In add ition to monitor ing air qua lit y, the crew a lso per for med soi l and w ipe tests before and af ter any blasting work. " We sent a letter to a l l homes and businesses w ithin a 200 -foot [61 m] rad ius of the containment area, ask ing for per mission to per for m pre- and post-soi l and w ipe tests," said Fora k is. ( Wipe tests inc lude w iping areas such as w indow si l ls and ana lyzing the par tic les that are found on these sur faces to ensure that no lead entered the soi l af ter blasting.) High-Tech Blasting With all the proper safety measures in place on the outside of the containment area, the crew was then ready to begin the abrasive blasting process. Using a si x-pot, recycling blast machine, manufactured by Atlantic Design, and 40/50 mi x steel grit from Er vin Industries, the crew got to work. According to Forakis, the blast machine allowed for si x men to blast simultaneously, and all media is recyclable. " T he recycling mechanism of the machine separates ever ything out, so that all the clean grit goes back into the blasters. T his saves time and money, and is good for the environment as it lessens the amount of waste that must be disposed of," stated Forakis. Vacuums and dust collectors were also used inside the contain- ment system to minimize the production of dust and debris during the abrasive blasting. And Finally… A f ter the section of the br idge was blasted to NACE No. 2/ Societ y for Protective Coatings (SSPC) Sur face Preparation (SP) 10: Near-W hite Blast C leaning , it was time for the Titan team to apply a Sher w in-Wi l liams three-coat system to the steel. T he Zinc C lad 200 pr imer coat was spray-applied to the steel at a dr y f i lm thick ness of 3 to 5 mi ls (76 –127 microns). A str ipe coat of the same mater ia l was then br ushed on and rol led at the edges and cor ners. " Ty pica l ly, we lay dow n a Bridge Coatings Then the crew spray-applied a coat of the epoxy at 5–8 mils (127–203 microns) dr y film thickness (DFT). They striped and coated 2–4 mils (51–102 microns) DFT of Cornothane II last. Co ati n g th e Cu m b e r l an d , M d ., b r i d ge p r ov i d e d a u n i q u e s e t of challenges for Titan Industrial Services. It had to stay in service during the work and they had to do lead abatement, to name two. Af te r h av i n g p l at f o r m s c af f o ld i n g a n d a co n t a i n m e n t s y s te m constructed, the crew abrasive-blasted the steel and applied a primer. They followed that with a stripe coat of Sherwin-Williams' Steel Spec Epoxy.

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