Mega System Tech iCV-03 Manual de usuario descargar pdf (Pagina 58)

OCTE SAFEdoc

FAB

WELDING FIRES AND EXPLOSIONS TEST

1. How do air ducts and shafts increase fire hazards?

2. What danger is posed by excessive oxygen in the atmosphere?

3. What must flammable gases, vapours, liquids or dusts be mixed with to create an

explosive atmosphere?

4. Why should gas cylinders, hoses and torches be kept outside a confined space where

welding is being done?

WELDING FUMES AND GASES TEST

1. To reduce the danger of fumes, what is the first, simplest, and most basic precaution?

2. What product, used to treat metal surfaces, will produce phosphine gas?

3. What gas may be produced by degreasing fluids?

4. What plastic material should be stripped or removed from the weld area before welding

or cutting?

5. What vapours change into a dangerous gas when acted upon by ultraviolet light?

6. What causes negative pressure in some respirator face pieces?

7. Which is best, a negative or a positive pressure face piece?

8. If the cartridge or canister of an air-purifying respirator becomes hot, what does this

signify?

9. Name four factors, other than clothing, that can interfere with the fit of a respirator face

piece.

FAB SAFEdoc Page 55

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Mega System Tech iCV-03 Manual de usuario Pagina 58