answers with solutions
Station 1 (Environmental Conditions) Duties - ANSWER - Use sling psychrometer to measure wet
and dry bulb temperature
- Lookup in table (first using dry bulb) the relative humidity and dew point
- Record surface temperature
- Record if safe to coat (if difference is greater than 3 degrees celsius)
Station 2 (Profile) Duties - ANSWER - Use the provided two-sided metal sheet for analysis
- First, use the surface profile comparator and magnifying glass to read the closest profile
reading of provided sheet (both sides)
- Second, use Testex tape to take two readings of the surface (both sides) and record value using
a spring-loaded micrometer. Stick tape to test. If value falls between 1.5-2.5 mils, use other tape
and test again.
- Third, zero the 224 Gauge using a piece of glass.
- Forth, use the 224 Gauge (orange, surface profile gauge) to take 20 readings (10 each side) on
both sides of the sheet (total 40 readings).
- Take averages of Testex tape and 224 Gauge readings for each side of the sheet.
Station 3 (Hi-Voltage) Duties - ANSWER - Know how to safely use a Hi-Voltage Holiday Detector.
- Know Standard 0188.
- Know the five things.
Station 4 (Type 1 Gauge) Duties - ANSWER - Verify the Type 1 Gauge. Take one DFT reading of
the finished topcoat, and pick a block in orange book nearest to value. Record values.
- Take 10 BMR (bare metal readings). Record.
, - Take 15 readings of primer. Record.
- Take 15 readings of top coat. Record.
Station 5 (Low Voltage Holiday Detector) Duties - ANSWER - Should already be attached and
grounded to plate.
- Move the detector around the plate to locate holidays. Check edges. Plate will be flat. Dig for
them.
- Answer questions (5 points).
Station 6 (Wet Film Thickness) Duties - ANSWER - Pick up the comb gauge, highest notch with
coating on it is the recorded WFT (wet film thickness)
- Wet to dry conversion calculation (given SBV)
- Calculate how much coating do you need
- If told solvent, it does not impact amount of paint
Station 7 (Type 2 Gauge) Duties - ANSWER - Verify the PosiTector, take a reading of the topcoat
- Select a single shim with a thickness at or close to the reading and record thickness value of
the shim.
- If the readings do not match, increase or decrease until it matches the shim's measured
thickness. Repeat to ensure it matches.
- Take 15 primer readings, 5 locations with 3 spot readings (both sides)
- Take 15 topcoat readings, 5 locations with 3 spot readings (both sides)
Section 8 (Soluble Salt Detection) Duties - ANSWER - How to do a Bresle Test
- How to do a Sleeve Test
- Know the indicated slides