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TRAINING ASSESSMENT DAY 41. 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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5. Describe the use of a banana gauge on Aluminium and
Galvanised substrates?
• Banana gauge cannot be used on aluminium, If used
on galvanized substrate, thickness of zinc coating
should be deducted (100 micron).
• NOTE : can also be used on ferritic stainless steel
6. What information needs to be recorded on a site painting
report?
• Time , Dry bulb temp ,Wet bulb temp , Dew point ,
Steel temp, R.H % for morning and afternoon areas
inspected, grade of surface preparation .
• Type of paint, method of application, abrasive
supplier, paint supplier, Contract No, Date, Batch no,
Size of abrasive, Pressure applied.
7. Disadvantages and advantages of airless spray and
conventional spray?
• REFER BOOK
8. What product should be used for pipe coatings in damp
conditions?
• Moisture curing polyurethane should be applied in
damp condition only and not on wet conditions, shouldbe applied by brush only.
9. Describe the use of danger Bellows and what colour crystal
change would you expect, if carrying out a test fir xylene?
• Refer book
10. What is the name of the mill used to produce mastics,
fillers and putties?
• Triple roll mill
11. What safety factors should be observed when using
solvents?
• Toxicity should be checked ,Flash point ,Eye hand
protection, no naked flame, ventilations ,COSHH
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document should be available ,Binder compatability
,MSDS
12. What action should be taken if it is noted that a
contractor has applied a coat of paint?
• Raise a non – confirmatory report .Give the corrective
action to the concerned engineer. Recommend reblast
and recoat in correct sequence in accordance with
PA10.
13. Name 6 opaque pigments and their colours?
• Carbon – Black
• Titanium dioxide – white
• Compounds of cobalt – Blue• Compounds of chromium – Green ,yellow and orange
• Compounds of iron – Brown , red and yellow
• Compounds of calcium – red and yellow
14. Name a Non – Destructive DFT measuring equipment?
• Banana gauge , Elcometer ,Tinsley pencil