Mega System Tech iCV-03 Manual de usuario descargar pdf (Pagina 62)

OCTE SAFEdoc

FAB

4. Teflon-type plastics should be stripped or removed from the weld area.

5. The vapours of chlorinated hydrocarbon degreasers become a dangerous gas.

6. The wearer inhaling causes negative pressure.

7. A positive pressure face piece is best.

8. That a high concentration of gas or vapour is being encountered when a cartridge or

canister becomes hot.

9. Sideburns, beard, moustache, eyeglasses and goggles interfere with a respirator's fit.

ANSWERS TO CONTAINERS AND WELDING TEST

1. Assume that the container has held a flammable substance if you are unsure about the

contents.

2. Sugar, wheat, coal and wood have flammable dusts.

3. Hydrogen is produced.

4. Three ways to clean a container:

a. wash with water

b. low pressure steam

c. chemical plus low pressure steam

5. Prior to welding or cutting:

a. identify contents

b. determine internal combustion

c. clean

d. purge

e. isolate

6. Cleaning is intended to remove the bulk of liquids, solids and vapours. Purging is

intended to displace any remaining vapours and to exclude air.

7. To isolate a container is to disconnect or blank off any pipes leading into it which carry

dangerous substances.

8. Alternating current can cause spasms that tighten the grip on a conductor; DC has the

power to throw a person away from the conductor.

FAB SAFEdoc Page 59

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Mega System Tech iCV-03 Manual de usuario Pagina 62