ngi-welding & cutting-part 03

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– 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

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All electric cables, sockets and plugs should be suitable and in good conditions.

ELECTRIC CONNECTIONS

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Electric hand tools should be exactly checked for signs of defects such as frayed wires and etc.

ELECTRIC HAND TOOLS

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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.

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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.

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WELDING MACHINES

• Earthing wire of welding machine should be attached to grounded structures.

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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.

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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.

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CYLINDER GAUGES

• Cylinder gauges must be suitable and in good condition.

YESNO

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Subject to damage from other activities in the vicinity

Electrical cord inContact with thecylinder

Cylinder laying in a horizontalposition.

Check the cylinder and its surrounding

Electrical arcdamage

Cylinder is damaged. Should be taken out of service immediately!

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Do not touch the cylinders especially oxygen one with greasy / oily hands. There is a potential risk of explosion.

OXYGEN CYLINDER

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In oxy-acetylene carts, In oxy-acetylene carts, flashback arrestors must flashback arrestors must be fitted close to the be fitted close to the torch i.e. within 0.50 m .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 CARTSOXY-ACETYLENE CARTS

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OXY-ACETYLENE CUTTINGOXY-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

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The torch setup was not equipped with a The torch setup was not equipped with a ““flashbackflashback” arrestor check valve and the fire ” arrestor check valve and the fire traveled through the hose into the compressed traveled through the hose into the compressed cylinder.cylinder.

INCIDENT

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Thank you Thank you for your for your

attention.attention.

Thank you Thank you for your for your

attention.attention.