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NGI-Welding & Cutting-Part 03
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NGI-Welding & Cutting-Part 03

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Transcript

  • 1.
      • Floor and wall openings must be covered.
      • Flammable gases or vapors should not be present, thus gas test should be done.
      • - Any condition that could result in undue hazards by performing the work like falling sparks on to installations.
    SAFE WORK PRACTICES
  • 2. All electric cables, sockets and plugs should be suitable and in good conditions. ELECTRIC CONNECTIONS
  • 3. Electric hand tools should be exactly checked for signs of defects such as frayed wires and etc. ELECTRIC HAND TOOLS
  • 4. WELDING MACHINES
    • The machine should be located in a clean dry place. Dirt and dust that can be drawn into the machine should be kept to a minimum.
  • 5. WELDING MACHINES
    • Welding machines should be properly grounded.
    • Earthing rod should be inserted into ground minimum 7” ( 19 cm ).
    • A proper fire extinguisher should be available prior to start the work.
  • 6. WELDING MACHINES
    • Earthing wire of welding machine should be attached to grounded structures.
  • 7. ELECTRODE HOLDER
    • Electrode holders must be provided with a handle of tough insulating, non-ignitable material with a guard disc of similar material between the hand of the operator and the welding tool.
    • An Electrode holder, when live or containing a rod, must be placed on insulating supports, when not in use.
  • 8. CYLINDER SAFETY Cylinders must be upright at all times. Cylinders must be shifted by trolley. Do not roll them on the ground. Hoses, gages and fittings should be safely connected and in good condition.
  • 9. CYLINDER GAUGES
    • Cylinder gauges must be suitable and in good condition.
    YES NO
  • 10.
      • Subject to damage from other activities in the vicinity
    Electrical cord in Contact with the cylinder Cylinder laying in a horizontal position.
      • Check the cylinder and its surrounding
    Electrical arc damage Cylinder is damaged. Should be taken out of service immediately!
  • 11. Do not touch the cylinders especially oxygen one with greasy / oily hands. There is a potential risk of explosion.
      • OXYGEN CYLINDER
  • 12. In oxy-acetylene carts, flashback arrestors must be fitted close to the torch i.e. within 0.50 m .
    • If the torch flashes back on lighting up it is because the regulators are not set the correct pressure or a light has been applied before the flow of fuel gas is properly established.
    OXY-ACETYLENE CARTS
  • 13. OXY-ACETYLENE CUTTING
    • If the flame snaps out when the torch is in use, it is because:
    • Regulator pressure or gas flow are incorrect, either too high or too low.
    • The nozzle has been obstructed.
    • The nozzle has been held too close to the work.
    • The nozzle has become overheated.
    • In this case;
    • Completely shut off both torch valves.
    • Plunge the nozzle and torch head into water
  • 14. The torch setup was not equipped with a “ flashback ” arrestor check valve and the fire traveled through the hose into the compressed cylinder. INCIDENT
  • 15. Thank you for your attention.