Gas Cutting & Welding

8/9/2019 Gas Cutting & Welding

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SAFETY IN GAS

CUTTING





ACETYLENE CYLINDERS

Maroon in colour.

Acetylene gas (C 2 H 2 ) is issol!e inacetone (li"ui ) an store at 2#$%si& in a s%ecially esigne cylin er.

Acetylene cylin ers 'as a !olu e o*.# +.



Cross Sectional ,ie- o A

Cylin er



OXYGEN CYLINDERS

Oxygen is a colorless,tasteless, and odorless gasand is slightly heavierthan air.Oxygen cylinder is blackin colour.Oxygen stored at 2200 psiOxygen cylinders has a

volume of 6.9 m3



CYLINDER STORAGE

ell ventilated room !o open flame in the store

"0 m distance from oxygen and acetylenecylinders !o materials that are prone spontaneouscombustion #hould not be stored in direct sunlight.



Storing



Accessories



Regulators



UNLOADING FROM TRUCK

!ever drop$se %ooden &amp and coir matters '(0cmthick)*eep the top of the cylinder up &oll the cylinder keeping it upright



Lifti g c!li "ers #! cra e

$se of cradle+ leg bridle sling

- shackle and lifting lug



#hifting cylinders at sitevoid &olling / anual

carrying

$se trolley

Use of C!li "er trolle!



*eep the cylinder upright and a%ay fromhot 1obs.

ix the - and oxygen regulator to therespective cylinders after ensuring freefrom dirt or grease.

onnect the cutting hoses to the regulatorsand cutogen %ith hose clamps.4lue or blackhoses for oxygen and red for - .

RIG$T O%ERATION



Open the cylinder and check for leakage bysoap %ater test at the 1oints.5he same to befollo%ed for the oxygen cylinder. lose thecylinders .urge the oxygen line and then the - line

one after the other and close the valves.

RIG$T O%ERATION



Open the - regulator,the torch valve andlight the gas. 5hen open the oxygen valvesto the re7uired pressure.

fter cutting start closing from oxygen andthen - .

RIG$T O%ERATION





$A&ARDS

– FLASH BACK.

–BACK FIRE.

– GENERAL FIRE.

– EXPLOSION.



FLASH BACK

– RETROGRESSION OF THE FIRE UPTO

THE CYLINDER.

BACK FIRE

RETROGRESSION OF THE FIRE IN THE

CUTOGEN.



hen the blo% pipe becomes hot. !o88le blocked.

!o88le close to the 1ob.;ob close to the ground.

ressure difference bet%een flame pressure

and the hose pressure.

REASONS



FIRE ON CYLINDER

try to put out the fire close the valve if it gets put outother%ise inform fire dept. and keep oncooling the cylinder %ith %ater never pour %ater on hot cylinder



EX%LOSION

/easons0ire on cylinder 'pouring %ater on hot

cylinder)ylinder exposed to external heat

&ough handling



<elmets %ith face shields

4lack glass din value + to (

=eather gloves

=eather apron

#afety shoes

%%E



SAFETY IN 'ELDING





SAFETY IN 'ELDING

5he body of the %elding machine should beearth.

5he terminals of the %elding cables should be provided %ith lugs and kept tight.



SAFETY IN 'ELDING

5he 1oints in the cables should be made%ith terminals, kept tight and %ellinsulated %ith heat resistant tape.

5he cable should be free from 1ointsatleast for a length of three meters fromelectrode holder to avoid shock ha8ard.



SAFETY IN 'ELDING

Other electrical cables should not be keptlaid %ith %elding cables, to avoid

insulation damage.

or the return lead only proper cable

should be used. $sing rods, angles,channels etc. #hould be avoided.







$EALT$ $A&ARDS

>xposure to various toxic gases generated during%elding may produce one or more of thefollo%ing effects?@nflammation of the lungs 'chemical

phenmonitis)ulmonary edema 's%elling and accumulation of

fluids)hronic bronchitis.sphyxiation.

O $ 5@O! >A O#$&> #5 ! & #



O $ 5@O! = >A O#$&> #5 !- &-#&>= 5@!B 5O >=-@!B $ >

O!#5@5$>!5

C$EMICALS luminum oxideadmiumhromium @@@

C@opper luoride

@ron

=eadanganese !ickel'insoluble) ' #oluble)O8one

elding fume

1ES LONG TERM S$ORT TERM "0.0 mg m 3

0.0( mg m3 0.0( mg m3

0.0( mg m 3

0.( mg m 3

0.( mg m 3

0.2 mg m3

2.( mg m 3

(.0 mg m 3

0."( mg m 3

(.0 mg m 3

0." mg m 3

0." p.p.m(.0 mg m 3

0.3 p.p.m



5O&# 5O 4> O!#@->&>- @!

##>## >!5#

elding position

elding location-uration of exposure



>limination or substitution

odification of the process or

engineering

=ocal exhaust ventilation

Beneral dilution ventilation

ersonal protective e7uipment

%re(e ti(e Measures



FACE SHIELD WITH ATTACHED HELMETEYE

– GOGGLES, FACE-SHIELD. – DIN VALUE OF BLACK GLASS 12 to 14 .

HAND – LEATHER HAND GLOVES FLAME RESISTANT!

BODY – LEATHER A"RON # LEG GAURD.

FOOT – SAFETY SHOE.

%erso al %rotecti(e E)ui*+e t



$A&ARDS AT SITE

orking overhead.

orking in confined spaces.elding or cutting tanks or vessels.

5ripping ha8ards.



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Gas Cutting & Welding