TRAINING ASSESSMENT DAY 4 1. How many times can Garnet be recycled and reused? • Max of 3 times in enclosed area and once in open site or BGAS site. 2. Describe the calibration and use of a Surface Profile Needle Gauge? • Place the needle gauge on a glass, and then apply slight pressure to the foot to ensure that is perfectly on the glass. Loosen the locking screw and bring the Bezel to zero and tighten the locking screw. The gauge is now calibrated .Take a minimum of 10 readings, in random positions over the substrate. The average of the reading is calculated, which is the surface profile reading cannot be used in curved surfaces. 3. List the safety equipment required for an abrasive blasting operation on site? • Carbon impregnated hose, hoses to be short as much as possible • Earthing the pot, using the reinforced hoses, external bayonet type coupling • Air fed helmet with adequate visors ,safety in accordance with IGE SR 21 • Leather apron and gloves • Ear protectors • Scaffolding with safe tags ,boots, barriers warning signs • Deadmans handle in direct control with blasting operator. 4. What is the definition of the Barrier principle? • It provides a physical impermeable coating to project the underlying substrate .The coating system physically prevents the electrolyte from making contact with the substrate
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