SAFETY IN GAS CUTTING AND WELDING

SAFETY IN GAS CUTTING AND WELDING

ACETYLENE CYLINDERS:

  • Maroon in colour.
  • Acetylene gas (C2H2) is dissolved in acetone (liquid) and stored at 250 psi, in a specially designed cylinder.
  • Acetylene cylinders has a volume of 8.5 m3.

OXYGEN CYLINDER:-

  • Oxygen is a colorless, tasteless, and odorless gas and is slightly heavier than air.
  • Oxygen cylinder is black in colour.
  • Oxygen stored at 2200 psi.
  • Oxygen cylinders has a volume of 6.9 m3.

CYLINDER STORAGE:-

  • Well ventilated room.
  •  No open flame in the store.
  • 10 m distance from oxygen and acetylene cylinders.
  • No materials that are prone spontaneous combustion.
  • Should not be stored in direct sunlight.

Regulators:-

UNLOADING FROM TRUCK:-

  • Never drop.
  • Use wooden Ramp and coir matters (50cm thick).
  • Keep the top of the cylinder up.
  •  Roll the cylinder keeping it upright.

Lifting cylinders by crane:-

  • Use of cradle.
  • 4-leg bridle sling.
  • D-shackle and lifting lug.

Use of Cylinder trolley:-

  • Shifting cylinders at site.
  • Avoid Rolling & Manual carrying.
  • Use trolley.

RIGHT OPERATION:-



  • Keep the cylinder upright and away from hot jobs.
  • Fix the DA and oxygen regulator to the respective cylinders    after ensuring free from dirt or grease.
  • Connect the cutting hoses to the regulators and cutogen with hose clamps.Blue or black hoses for oxygen and red for DA.
  • Open the cylinder and check for leakage by soap water test     at the joints.The same to be followed for the oxygen     cylinder.Close the  cylinders .
  • Purge the oxygen line and then the DA line one after the other and close the valves.
  • Open the DA regulator,the torch valve and light the gas. Then open the oxygen valves to the required pressure.
  • After cutting start closing from oxygen and then DA.

HAZARDS:-

FLASH BACK.

BACK FIRE.

GENERAL FIRE.

EXPLOSION.

FIRE ON CYLINDER:-

  • try to put out the fire.
  • close the valve if it gets put out.
  • otherwise inform fire dept. and keep on cooling the cylinder with water.
  • never pour water on hot .

EXPLOSION:-

Reasons:

  • Fire on cylinder (pouring water on hot cylinder).
  • Cylinder exposed to external heat.
  • Rough handling.

PPE FOR SAFETY IN GAS CUTTING AND WELDING

  • Helmets with face shields.
  • Black glass – din value 4 to 5.
  • Leather gloves.
  • Leather apron.
  • Safety shoes.

SAFETY IN WELDING:-

  • The body of the welding machine should  be earth.
  • The terminals of the welding cables should be provided with lugs and kept tight.
  • The joints in the cables should be made with terminals, kept tight and well insulated with heat resistant tape.
  • The cable should be free from joints at-least for a length of three meters from electrode holder to avoid shock hazard.
  • Other electrical cables should not be kept laid with welding cables, to avoid insulation damage.
  • For the return lead only proper cable should be used. Using rods, angles, channels etc. Should be avoided.
  • Never change electrode with bare hands or wet gloves, when standing on wet floors.

HAZARDS:-

  • Fire
  • Shock
  • Health hazards

HEALTH HAZARDS:-

  • Exposure to various toxic gases generated during welding may produce one or more of the following effects:
  • Inflammation of the lungs (chemical phenmonitis)
  • Pulmonary edema (swelling and accumulation of fluids)
  • Chronic bronchitis.
  • Asphyxiation.

Preventive Measures 



  • Elimination or substitution.
  • Modification of the process or  engineering.
  • Local exhaust ventilation.
  • General dilution ventilation.
  • Personal protective equipment,

Personal Protective  Equipment:-

  • FACE SHIELD WITH ATTACHED HELMET
  • GOGGLES, FACE-SHIELD.
  • DIN VALUE OF BLACK GLASS 12 to 14 .
  • LEATHER HAND GLOVES (FLAME RESISTANT)
  • LEATHER APRON & LEG GUARD.
  • SAFETY SHOE.

HAZARDS AT SITE:-

  • Working overhead.
  • Working in confined spaces.
  • Welding or cutting tanks or vessels.
  • Tripping hazards.

 

10 thoughts on “SAFETY IN GAS CUTTING AND WELDING”

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