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Wednesday, 21 September 2016

Safety during Gas cutting

Safety during Gas cutting




Objective


Something to think on...

Oxyacetylene cutting outfit


Acetylene cylinders

Acetylene cylinders

Oxygen  cylinders

Cylinder Identification


Gas cutting hazards

.

Cylinder storage


Unloading from truck






























Read More :-

 Welcome to 
Safety during Gas Cutting activities 

Something to think on……

¨Every time you use the oxy-acetylene equipment, if certain safety guidelines are not followed, it would be the same as handling live explosives ready to go off…….

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 CYLINDERS

¨Oxygen is a colourless, tasteless, and odourless 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 identification

Gas cutting  hazards


MFire & Explosion
MBurns
MExposure to UV radiation
MOxygen depletion
MScattering of hot particles
MToxic Gases & Fumes
MHeat stress
MErgonomics
MFall of Person & Objects
CYLINDER STORAGE
¬ Well ventilated room
¬ No open flame in the store
¨No materials that are prone spontaneous combustion
¨ Should not be stored in direct sunlight.
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
Care & maintenance of the Gas Regulators
Some more info on regulators
qWarning -Always keep the regulator free of oil, grease and other flammable substances
q Never use oil or grease on the regulator, cylinder or manifold connection
qDO NOT change the inlet connection on a regulator in an attempt to use the regulator for a different gas service
Fusible Plug

CUTTING NOZZLES
 The Hoses
qThe hoses are usually color coded
qOxygen(blue)   
qAcetylene(red)
qBe careful not to use other hoses, such as air lines,
q LP gas, etc.
qBe careful around sharp objects, they can be cut very easily
qThey are constructed of flame retardant materials,
qbut will burn if there is a flashback or exposed to sustained heat
qHoses are graded
    Make sure you are using the right hose for the right gas
Hose
qKeep welding hoses clear of any failing metal, slag or sparks.
qNever allow hoses to become coated with oil, grease or dirt.  Such coatings could conceal damaged areas.
qExamine the hoses before attaching to welding torch handle or regulators.
qIf cuts, burns, worn areas or damaged fittings are found, replace the hose.
qCompletely replace welding hose if it contains multiple splices or when cracks or severe wear is noticed.
q
HAZARDS

¤FLASH BACK.
¤
¤BACK FIRE.
¤
¤GENERAL FIRE.
¤
¤EXPLOSION.

Back fire
}retrogression of the flame towards the blowpipe mixer.

Flashback
}retrogression of the flame beyond the blowpipe body into the hose.
xer.

Backfire / Flashback

Indications
pHissing noise
pHeavy black smoke
pSpark coming out of nozzle / tip
pTorch handle getting hot

Backfire / Flashback causes  

¨
¨Flame held too close to work
¨Slag blocking tip
¨Hot metal falling on and burning through hose
¨Faulty equipment
¨Wrong gas sequence during start-up
¨Insufficient purging to clean hose before use.
¨Gas hoses damaged by previous flashback.

Backfire / Flashback causes

¨Using operating pressure too low for the tip.
¨Loose fitting of nozzle / tip.
¨hose run-over by vehicle during welding
¨Incorrect selection of Flashback arrester.
¨Hoses of incorrect diameter.
¨Over heating of blowpipe tip, worn out, undersized.

Backfire / Flashback

If Backfire/ Flashback
pClose control valve of O2 blowpipe.
pClose spindle valve of O2 cylinder.
pSpray water to acetylene cylinder from a distance.
pCall Fire brigade
pInform supplier

UNSAFE WAY OF OF HANDLING THE CYLINDER

HOSE CLIP NOT FOUND & CLAMPED WITH THE BINDING WIRE

DAMAGED CUTTING TORCH IS INSULATED BY THE LEATHER MATERIALS

FIRE ON CYLINDER

üClose the valve
üTry to extinguish the fire.
üDetach the regulator
üImmerse the cylinder in
      water or apply  water copiously
     at the bottom half of the cylinder.
üOpen the valve and keep it the cool water till it becomes empty
üDo not stand in the direction of fusible safety valve fixed at the bottom of the cylinder.

Nozzle Mixing Technology

ImportantDo's & “Don'ts

Do's
øLeave Key wrenches on cylinder when in use.
øKeep DA cylinder in an upright position.
øEnsure it is secured to a solid structure and on a solid base so that it does not fall over.

ImportantDo's & “Don'ts

DO NOT’s
¨Lubricate cylinder valve threads.
¨Use as rollers, supports
¨Keep in battery room
¨Allow it to come in contact with live wire
¨Keep in direct sun.
¨Do not attempt to cut / weld container



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