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Work Area Area Should be Clear and Free of Combustibles

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Presentation on theme: "Work Area Area Should be Clear and Free of Combustibles"— Presentation transcript:


2 Work Area Area Should be Clear and Free of Combustibles
Area Should Be Well Ventilated Fire Extinguishers Should Be Available Area Should Be Free of Open Arcs or Flames Fireproof Blankets and/or Screens Are Suggested

3 Personnel Protection Wear Approved Eye Protection
Wear Flame Resistant Clothing Wear Long Sleeves, Pocket Flaps and No Cuffs Wear Approved Foot Gear Wear Approved Hand Protection 2

4 Proper Eye Protection LENS SHADES SELECTION
FOR OXYGEN FUEL GAS APPLICATIONS Operation Material Size (inches) Minimum Protective Shade number Recommended Shade Number* Oxygen Fuel Gas Welding < 1/8” 1/8” to ½” > ½” 4 5 6 4-5 5-6 6-8 Oxygen Fuel Gas Brazing 3 3-5 Air Fuel Gas Soldering 2 2-4 Oxygen Fuel Gas Cutting < 1 1” to 6” 3-4 *As a rule of thumb, start with a shade that is too dark to see the weld or cutting zone. Then go to a lighter shade, which gives sufficient view of the weld or cutting zone without going below the minimum. 2A

5 (Steel Toes Recommended)
Proper Attire Industrial Quality Face Shield Hard Hat with Visor Turned to the Back Long Sleeve Shirt Gauntlet Leather Welding Gloves Pants without Cuffs Hightop Leather Boots (Steel Toes Recommended) 2B

6 Oxygen Gas Considered by Many as The Most Dangerous Gas
Know the Difference Between Oxygen and “Air” Does Not Burn Itself, But Causes Other Materials To Burn More Vigorously Heat of Recompression – Open Valve Slowly Keep Away From Combustibles – Especially Oil Do Not Saturate Clothing, etc. 3


8 9A Courtesy of CGA

9 Oxygen Cylinder High Pressure Cylinder – 2200 PSIG or Higher
Valve Cap High Pressure Cylinder – 2200 PSIG or Higher Hollow, Seamless Steel Construction Do Not Abuse Cylinder Never Use For Other Than Intended Use Report Any Damage to Supplier Contents Vigorously Supports Combustion High Pressure Hazard Oxygen Cylinder 4

10 Oxygen Cylinder Valve CGA 540 Compressed Gas Association (CGA) 540
Stuck Valve – Valve Wrench Only/Call Supplier High Pressure Safety - Do Not Hang Objects On Cylinder - Never Tamper With Valve Construction Heat Source Can “Blow” Safety Only Fully Open or Fully Closed Report Any Leaking or Damaged Valve to Supplier Upper Valve Seat Lower Valve Seat To Oxygen Regulator Burst Disc Safety From Oxygen Cylinder 5

11 Moving Oxygen or Other High Pressure Cylinders
Moving Cylinders Not In use: Must Have Caps On Do Not Lift – Roll on Bottom Edge Use An Approved Carrier Moving Cylinders That Are In Use (Regulators Attached) Must Be In An Approved Carrier! 6

12 Using Oxygen And Other High Pressure Cylinder Gases
Secure Cylinder In A Cart Or to Strong Permanent Structure Do Not Use Near Flame, Flammables, Open Arc, Etc. Use Only In An Upright Position Use Only In A Well Ventilated Area Always Inspect Cylinders For Damage Valve Fully Opened or Closed 7

13 Acetylene Gas Calcium Carbide and Water Unstable and Highly Flammable
Shock Sensitive Lighter Than Air Not to be used above 15 PSIG 8

14 Acetylene Cylinder Is Unique
Not Hollow –Acetone in Porous Monolithic Filler Material Should Only Be Used And Stored Upright Has Fast Acting ValveOpen ½ - 1 Full Turn Has “Fusible Plugs” (212o F) 9

15 Acetylene Cylinder Low Pressure – 250 PSIG @ 70o F
Thin Walls, Welded And Easily Damaged Do Not Abuse – Can Explode If Abused Do Not Use For Other Than The Intended Use Never Use A Damaged Cylinder Report Damages To Supplier Do Not Attempt To Repair Leaks Move Leaking cylinders Outside If Permitted 10

16 Using Acetylene Flammable – Keep Cylinders Away From Sources of Ignition or Heat Shock Sensitive – May Decompose Violently Limited Withdrawal Rate – “1/7th Rule” Asphyxiation 15 PSIG Maximum Use Pressure Do Not Use Copper Piping 11

17 Acetylene Fires Most Fires Start In Valve Area – Check for Leaks
Fusible Metal Plugs Melt At 212o F Flames – 5’ x 3’ Very Difficult To Extinguish Evacuate Area Call Fire Department 12

18 Alternate Fuels Propane, Propylene, Etc. Liquid Under Pressure
Heavier Than Air Not Shock Sensitive Can Be Used Up To Full Cylinder Pressure Limited Withdrawal Rate – Dependent Upon Cylinder Size, % Full and Ambient Temperature 8A

19 Liquid Petroleum Gas (LPG) Cylinder
Hollow, Welded, Thin Wall Cylinder Vapor Space Above Liquid Use Only While Standing Up Low Pressure Less Than 500 PSIG Has Fast Acting Valve Open ½ to 1 Full Turn Valve Safety Relieves and Resets Never Use A Damaged Cylinder CGA 510 Valve Handwheel Handwheel Packing Nut Packing Nut To LPG Regulator To LPG Regulator Valve Seat Valve Seat Valve Safety From LPG Cylinder From LPG Cylinder Valve Safety 9A

20 Oxy/Fuel Equipment Equipment Set Up
Secure Cylinders Before Removing Caps “Crack” Oxygen Valve and Wipe Fuel Gas Valve With a Clean Cloth Attach Regulators With Smooth Jawed Wrench Back Out Adjusting Screws Torch Valves Must Be Closed Tighten Wrench Connections According To Manufacturers Instructions Inspect and Test Equipment 13


22 Secured Cylinders 13A

23 Tighten all connections with smooth jaw wrench

24 Equipment Inspection Look For Any Physical Damage
Look For Other Signs of Abuse or Improper Use Look For Contamination – Oil, Dirt, etc. Clean, Replace Or Repair Before Use 14

25 Equipment Testing Properly Tighten All Connections and Check To
See If All Valves Are Closed Stand To The side And Open Valves Slowly Check For Leaks Use Approved Bubble Solution or Pressure Test Fix Any And All Leaks Before Proceeding 15

26 Before Lighting Oxy/Fuel Gas Torches
Make Sure All Valves Are Closed And Regulator Adjusting Screws Are Backed Out Set Gas Pressures According to the Manufacturers Tip Charts Open Then Close Each Gas Valve Independently To “Bleed” The System Set Pressures “At Flow” 16

27 Lighting An Oxy/Acetylene Torch
Slightly Open Acetylene Valve And Light With An Approved Device Root Flame and Clear Smoke Open Oxygen Valve And Set Flame To “Neutral” Sharp, Defined Inner Cone Never Light Torch With Both Oxygen And Acetylene Flowing 17

28 Welding Flame Types Carburizing Flame Neutral Flame Oxidizing Flame

29 Lighting Equal Pressure Torches Using Alternate Fuel Gases
Open Torch Valves 1/8 to ¼ Turn Ignite Fuel Gas With Approved Igniter and Adjust Flame Introduce Oxygen And Adjust To The Desired Flame “Star Pattern” or Sound Tip Edge Touching Plate It is Permissible To Light The Flame With Both Gases Flowing Sometimes it is Necessary Adjusting For Large or Heating Tips: Increase Fuel Then Oxygen In Successive Steps 17B

30 Lighting Low Pressure Injector Torches
It is Permissible To Light Torch With Both Gases Flowing Use Special Purge Sequence To Clear The System of Mixed Gases Open Fuel Gas Valve ½ to ¾ Turn Open Oxygen Valve Slightly 1/8 to ¼ Turn Ignite Flame With An Approved Igniter Adjust To Desired Flame Tip Edge Touching Plate “Star Pattern” or Sound Adjusting For Large or Heating Tips: Increase Fuel Then Oxygen In Successive Steps 17C

31 Turning Off An Oxy/Acetylene Torch
Proper Sequence Checks Integrity of Torch Valves Close Oxygen Valve First Close Acetylene Valve Second If Acetylene Valve is Leaking a Small Flame Will Continue Burning If Oxygen Valve is Leaking, Torch Will “Pop” as Acetylene Valve Is Closed If Either Valve Is Leaking, Repair Before Further Use 18

32 Turning Off Alternate Fuel Torches
Close Fuel Gas Valve First Close Oxygen Valve Second This Sequence Can Prevent The Operator From Being Burned If Fuel Pressure is Great Enough - Check Valves At Initial Light Up By Turning Oxygen Off First 18A

33 Shutting Down An Oxy/Fuel Torch
Overnight Or For An Extended Period of Time Turn Off Torch Close Cylinder Valves Open Then Close Each Torch Valve Independently To Bleed Pressure Back Regulator Adjusting Screw Out Until Loose Store Hose and Equipment In a Clean Area Away From Potential Damage 19

34 Check Valves and Flashback Arrestors
Are a one way valve that stops the reverse flow of gases FLASHBACK ARRESTORS Have a special element, sintered metal filter, that can quench a flame Generally also include a check valve 20

35 Check Valves and Flashback Arrestors
Are the basic safety device Prevents flash back accidents caused by “reverse flow” -Flashbacks can cause the most serious injuries Check valves can fail because of “dirt” or other contamination -Keep equipment clean -Check them periodically 21


37 Check Valves and Flashback Arrestors
Flashback arrestors are the ultimate safety device Usually have a check valve built into it, but, can also stop a flame -The check valve can fail because of contamination The Heat sink element will absorb heat from a fire The element should also be kept free of contamination and checked periodically 22

38 Torch vs Regulator Flash Back Arrestors
Where should Check Valves and Flashback Arrestors be Mounted The Golden Rule: “Mount them as close to the point of mixing as possible” Torch Mount Gives the best and most protection May be inconvenient for the operator Cannot be used for “high flow” applications Are subjected to more abuse 23

39 Mount at the Torch vs Regulator -continued
Regulator Mount Should use check valves at the torch also High flow types are physically too large for torch Take less abuse because they are out of the way Do Not Use Both Too much restriction Could cause other safety problems 24

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