compressed gas 2

7/30/2019 Compressed Gas 2

http://slidepdf.com/reader/full/compressed-gas-2 1/29

Compressed Gases



Stories of Compressed Gases

Employee killed when cylinder turned into arocket because its valve was knocked off

Employee suffocated after entering a space

filled with nitrogen Facility damaged when acetylene cylinder

heated up and exploded

Eyebrows singed when lighting a gas BBQ



Training Goals

Compressed Gases and Cylinders in General

Specific Compressed Gases

Quiz



Basics of Compressed Gases

Chemicals include oxygen, argon, nitrogen,helium, acetylene, hydrogen, nitrous oxide,carbon dioxide, ammonia, chlorine, etc.

Compressed gases used in bulk systems or portable cylinders

Industry uses include welding, cutting,

operating tools, transferring liquids, blowingagents, laboratories, etc.



Hazards of Compressed Gases

Explosion

Flammability

Corrosive

Toxicity

Reactivity

Air displacing

Check MSDS for specific hazards



Markings or Labels

Name of the compressed gas

Hazards of the compressed gas

National Fire Protection Association(NFPA) labels

Department of Transportation (DOT) labels

Do not remove any labels



Bulk Systems

Built and maintained by qualified personnel

Filled by trained and qualified personnel

Tank and piping properly labeled

Tank system protected from damage



Cylinder Transportation

Receiving/shipping cylinders requiresDOT Hazardous Materials training

Use lift trucks or hoists only with proper

lifting equipment Never use a sling or electromagnet to hoist

a cylinder

Never lift a cylinder by the valve cap



Manual Cylinder Handling

Close the valve and puton the cap

Do not “walk” cylinder by holding onto valvestem or cap

Never roll a cylinder

on its side Use a hand truck with a

secure system



Cylinder Storage Area

Dry, well ventilated, protected from weather

Away from combustibles, heat sources,electrical systems

No sparks, smoking, open flames

Oxygen separated from fuels

Upright, secured, valve cap on

Not in elevators, staircases, hallways, etc.

Sign requirements



Cylinder Use

Upright and secure

Away from flames, sparks, electricity

Keep oil, grease, flammables off cylinders

Open valve by hand, if tools required don’tuse the cylinder

Open valve slowly with hand to the side

Don’t tamper with safety devices



Regulators and Gauges

Regulator and gauge rated for the pressurein the gas system

Regulator must be compatible with the gas

Do not exchange gauge from one gas toanother

Thread sealant recommended by

manufacturer for application Wear eye protection when operating regulator



Leaking Cylinders

Never try to repair

Tag it, move itoutdoors, and keep

it away from heator flame

Call manufacturer or dealer



General Cylinder Safety

Only accept and use DOT approved cylinders

Do not drop cylinders

Protect cylinders from cuts and abrasions

Don’t use cylinders for unintended functionsuch as a roller or support

Don’t tamper with safety valves

Caps on whenever not in use



Goals of Compressed Gases



Quiz



LPG (Propane)

Liquid petroleum gases (LPG) include propane, propylene, butane, butylene

Liquid under pressure, released as a gas

LPG containers must meet specificdesign criteria

Cylinders have pressure relief valves

Regulated by local fire department



LPG Hazards

Flammable and reactive

Gases are colorless and odorless

Heavier than air, may build upand explode unexpectedly

Adequate ventilation required



LPG Containers

Marked as an approved container

Capacity and design pressure

Shut-off valve, pressure relief valve,level gauge

Never use container not approved for LPG,corroded or damaged, missing accessory



LPG Handling

No smoking, usesparkless tools

Fill or dispense outside

or in well-ventilatedarea — wear PPE suchas glove and goggles

Secure to forklift or other vehicle

Report damaged cylinders

Leak detection



Compressed Air

Flying fragments penetrate eyes or skin

Compressed air can penetrate skin, damageeyes or ears

Use lowest pressure for the job

Wear eye and skin protection

Store air hose properly and inspect regularly



Oxygen

Does not burn or explode by itself

Supports

combustion process Explosive with

acetylene, hydrogen

Never handle with oilyhands or gloves



Acetylene

Flammable

Cylinder packed with porous material andsolvent that holds the acetylene

Once the valve is opened, the acetylene flowsout in gaseous form

Pressure relief valve using fusible metal that

melts at about 212 °F



Miscellaneous Gases

Gases such as argon and nitrogen areused to displace air

Helium could cause rapid suffocation

Gases like ammonia and chlorine willcause large evacuations even for small leaks



Goals of Compressed Gases



Quiz



Summary

Cylinders must always be stored andsecured properly

Use caution when transporting cylinders

Understand the hazards of a compressedgas before using it

Even compressed air can be dangerous



Quiz

1. The best way to lift a cylinder is byattaching a sling to its cap. True or False

2. What type of gas cylinder must be stored awayfrom fuels? ______________________________

3. What’s wrong with storing a cylinder in a staircaseor hallway? ______________________________

4. Oxygen is dangerous because it willexplode or burn by itself. True or False

5. Describe the safest way to manually transport acylinder: _________________________________



Quiz (cont.)

6. Propane is naturally colorless andodorless. True or False

7. Compressed air can be dangerous because

_____________________________________________.8. Name two things that cylinder labels should contain:

____________________ and _____________________.

9. Breathing helium could cause

suffocation. True or False

10. The cylinder cap needs to be ononly when it is being transported. True or False



Quiz Answers

1. False. Never lift a cylinder by its cap and never usea sling to lift a cylinder.

2. Oxygen cylinders must be stored 20 feet away fromfuels or separated by 1/2 hour fire wall.

3. The cylinder is subject to more traffic, so the risk of being knocked over is greater.

4. False. Oxygen only supports combustion. Even aminute amount of oil can cause a reaction.

5. Use a handcart with a cylinder securing device suchas a chain.



Quiz Answers (cont.)

6. True. The odor is added to propane so that leakscan be more easily detected.

7. Compressed air can penetrate the skin, damageeyes or ears, or create flying objects.

8. Cylinders should be labeled with the name of the gas and the hazards of the gas.

9. True. Helium may block the flow of oxygen andcause suffocation.

10. False. Keep the cap on whenever the cylinder isnot being used.

compressed gas 2

Documents