Fundamentals of Gas Cutting and Welding - Online PDH and CEU
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Transcript of Gas Cutting & Welding
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SAFETY IN GAS
CUTTING
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ACETYLENE CYLINDERS
Maroon in colour.
Acetylene gas (C 2 H 2 ) is issol!e inacetone (li"ui ) an store at 2#$%si& in a s%ecially esigne cylin er.
Acetylene cylin ers 'as a !olu e o*.# +.
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Cross Sectional ,ie- o A
Cylin er
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OXYGEN CYLINDERS
Oxygen is a colorless,tasteless, and odorless gasand is slightly heavierthan air.Oxygen cylinder is blackin colour.Oxygen stored at 2200 psiOxygen cylinders has a
volume of 6.9 m3
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CYLINDER STORAGE
ell ventilated room !o open flame in the store
"0 m distance from oxygen and acetylenecylinders !o materials that are prone spontaneouscombustion #hould not be stored in direct sunlight.
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Storing
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Accessories
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Regulators
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UNLOADING FROM TRUCK
!ever drop$se %ooden & and coir matters '(0cmthick)*eep the top of the cylinder up &oll the cylinder keeping it upright
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Lifti g c!li "ers #! cra e
$se of cradle+ leg bridle sling
- shackle and lifting lug
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#hifting cylinders at sitevoid &olling / anual
carrying
$se trolley
Use of C!li "er trolle!
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*eep the cylinder upright and a%ay fromhot 1obs.
ix the - and oxygen regulator to therespective cylinders after ensuring freefrom dirt or grease.
onnect the cutting hoses to the regulatorsand cutogen %ith hose clamps.4lue or blackhoses for oxygen and red for - .
RIG$T O%ERATION
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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$T O%ERATION
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Open the - regulator,the torch valve andlight the gas. 5hen open the oxygen valvesto the re7uired pressure.
fter cutting start closing from oxygen andthen - .
RIG$T O%ERATION
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$A&ARDS
– FLASH BACK.
–BACK FIRE.
– GENERAL FIRE.
– EXPLOSION.
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FLASH BACK
– RETROGRESSION OF THE FIRE UPTO
THE CYLINDER.
BACK FIRE
RETROGRESSION OF THE FIRE IN THE
CUTOGEN.
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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
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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
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EX%LOSION
/easons0ire on cylinder 'pouring %ater on hot
cylinder)ylinder exposed to external heat
&ough handling
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<elmets %ith face shields
4lack glass din value + to (
=eather gloves
=eather apron
#afety shoes
%%E
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SAFETY IN 'ELDING
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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.
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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.
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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. $sing rods, angles,channels etc. #hould be avoided.
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$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 ! & #
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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$ORT TERM "0.0 mg m 3
0.0( mg m3 0.0( mg m3
0.0( mg m 3
0.( mg m 3
0.( mg m 3
0.2 mg m3
2.( mg m 3
(.0 mg m 3
0."( mg m 3
(.0 mg m 3
0." mg m 3
0." p.p.m(.0 mg m 3
0.3 p.p.m
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5O&# 5O 4> O!#@->&>- @!
##>## >!5#
elding position
elding location-uration of exposure
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>limination or substitution
odification of the process or
engineering
=ocal exhaust ventilation
Beneral dilution ventilation
ersonal protective e7uipment
%re(e ti(e Measures
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FACE SHIELD WITH ATTACHED HELMETEYE
– GOGGLES, FACE-SHIELD. – DIN VALUE OF BLACK GLASS 12 to 14 .
HAND – LEATHER HAND GLOVES FLAME RESISTANT!
BODY – LEATHER A"RON # LEG GAURD.
FOOT – SAFETY SHOE.
%erso al %rotecti(e E)ui*+e t
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$A&ARDS AT SITE
orking overhead.
orking in confined spaces.elding or cutting tanks or vessels.
5ripping ha8ards.
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Any Questions ?
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