GAS CUTTING SAFETY, WELDING SAFETY

SAFETY IN GAS CUTTING AND WELDING

ACETYLENE CYLINDERS:

SAFETY IN GAS CUTTING

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

Acetylene cylinder pressure between 17.5767 Kg/cm2(250 PSI) to 13.3583 kg/cm2 (190 PSI)

Acetylene working pressure 10PSI (0.70307 kg/cm2) (Do not exceed 15 psi)

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OXYGEN CYLINDER:-

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

A standard oxygen cylinder pressure between 154.6753 kg/cm2(2200 PSI) to 77.33765 kg/cm2 (1100 PSI)

Oxygen working pressure 20 PSI (1.40614 kg/cm2) to 25 PSI(1.75767kg/cm2)

CYLINDER STORAGE:-

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

Flashback safety in gas cutting

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 the 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 IN GAS CUTTING:-

–FLASHBACK.

–BACKFIRE.

–GENERAL FIRE.

–EXPLOSION.

A 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 the cylinder (pouring water on the 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 the electrode holder to avoid shock hazards.
• Other electrical cables should not be kept laid with welding cables, to avoid insulation damage.
• For the return lead, the 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 pneumonitis)
• Pulmonary edema (swelling and accumulation of fluids)
• Chronic bronchitis.
• Asphyxiation.

Preventive Measures 

• Elimination or substitution.
• Modification of the processor 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.

Flashback & Backfire safety

Compressed Gas Cylinders Toolbox Safety Topics