29 CFR 1910 Subpart H Hazardous Materials

1910.101Compressed gases (general requirements)

"Compressed gas" means:2.3…any material or mixture of gases having in a

container either an absolute pressure exceeding 40 psi at 70 deg. F. or

an absolute pressure exceeding 104 psi at 130 deg. F or both or

any liquid flammable material having a

Reid vapor pressure exceeding 40 psi absolute at 100 deg. F

See other definitions at 49 CFR 173.115

29 CFR 1910.1200

Compressed gas cylinder types

High Pressure Low Pressure

Comparative sizes

Compressed gas cylinder typesHigh Low Acetylene Cryogenic

> 900PSIG

< 900PSIG

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FusablePlug

FusablePlug

PorousMass

AcetoneSolvent

42%Volume

VeryVeryCold

LiquidCO2

CL2

NO2

ARO2

H2

N2

Vapor

Acetylene cylindersThe decomposition characteristics

of acetylene gas are avoided:

• By providing a porous mass packing material with minute cellular spaces

• No pockets of appreciable size remain where “free” acetylene in gaseous form can collect

• This porous mass is saturated with acetone, or other suitable solvent, in which the gaseous acetylene actually dissolves

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..

FusablePlug

FusablePlug

PorousMass

AcetoneSolvent

42%Volume

Acetylene cylindersThese two features – porous filler and

solvent

Allows acetylene to be contained at

moderate pressure without danger of explosive decomposition

Maximum cylinder pressure is 250 PSIG at 70 degrees F. with a variation of about 2.5 PSI rise or fall for each degree rise or fall in temperature

Do not exceed 15 PSI pressure on free acetylene

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FusablePlug

FusablePlug

PorousMass

AcetoneSolvent

42%Volume

OSHA STANDARDS29 CFR 1910 General Industry

Specific OSHA regulations applying to compressed gas cylinders

1910.253 Oxygen-fuel gas welding and cutting

1910.101 Compressed gases

101(a) Inspection of compressed gas cylinders

• Each employer shall determine that

compressed gas cylinders under his

control are in a safe condition to the extent that this can be determined by visual inspection...

Compressed gas industry

safety information directs end

users to examine

any cylinders received

Gas suppliers advise end users to

• Check cylinders as they are received

• Verify that labels, tags and shipping papers are appropriate

• Reject and return cylinders with obvious damage

• Determine that required caps and plugs are in place

(a) Inspection of compressed gas cylinders…

…visual and other inspections (per

DOT 49 CFR 171 –

179 and CGA C-6 & C- 8)

1910.101 - Compressed gasesGeneral requirements

Applicable to

Suppliersand

distributors filling compressed

gas cylinders

3.2.6 - Bulges Cylinders are manufactured with reasonably symmetrical shape. Cylinder which have definite bulges shall be removed from service

Compressed Gas Association Inc.CGA C-6 1968

Bulged - cylinder wall

failure

Charring or burning of paintBurning or scarfing of the metalDistortion of the cylinderMelted out fuse plugsBurning or melting of valve

5.3.7 - Fire Damage Cylinders shall be carefully inspected for evidence of exposure to fire

Compressed Gas Association Inc.CGA C-6 1968

Cylinder burst after fire exposure

Burn

Gouge with deposit of weld

metal

Gouge

CutReducing wall

thickness - increasing

stress

General corrosion with

pitting - reducing cylinder strength

101(b) "Compressed gases."

The in-plant handling, storage, and utilization of all compressed gases in cylinders, portable tanks, rail tankcars, or motor vehicle cargo tanks shall be in accordance with

Compressed Gas Association Pamphlet P-1-1965, which is incorporated by reference as specified in Sec. 1910.6

Pamphlet P - 1 1965

• 1910.101(b)

• The in-plant handling storage and utilization of all compressed gases in cylinders…shall be in accordance with Compressed Gas Association

• Pamphlet P-1 1965...

This includes most

industrial and commercial

facilities

3.1.14 Never tamper with the safety relief devices in valves or cylinders

3.1.15 Never attempt to repair or to alter cylinders, valves, or safety relief devices.

Section 3.1 General

3.1.16 Never use cylinders as rollers, supports, or for any purpose other than to contain the content as received

Section 3.1 General

Big &heavy

3.1.17 Keep cylinder valve closed at all times, except when the cylinder is in active use.

3.1.18 Notify owner of cylinder if any condition has occurred which might permit any foreign substance to enter the cylinder or valve giving details and cylinder serial number.

Section 3.1 General

3.1.19Do not place cylinders where they

might become part of an electric circuit.

When the cylinders are used in conjunction with electric welding, precautions must be taken against accidentally grounding compressed gas cylinders and allowing them to be burned by electric welding arc.

Section 3.1 General

Insulator

• Caps in place• Lifting • Dropping• Lifting with

magnets• Dragging

Section 3.2 Moving Cylinders

3.2.2 Do not lift cylinders by the cap.

3.2.3 Never drop cylinders nor permit them to strike against each other or against other surfaces violently.

Section 3.2 Moving Cylinders

Concrete

3.2.4 Never handle a cylinder with a lifting magnet.

3.2.5 Avoid dragging or sliding cylinders.

Electro-magnet

Section 3.2 Moving Cylinders3.2.6Use suitable hand truck, fork truck, roll platform or similar device with

cylinder firmly secured for transporting and unloading. !

3.3 Storing Cylinders

• Local Regs• Posting• Separation

(different types)• Separation

(charged & empty)• Storage rooms• Highly flammable

substances• Avoid dampness• Protection of

cylinders• Care of cylinders

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3.3 Storing Cylinders

3.3.6 Do not store cylinders near highly flammable substances such as oil, gasoline or waste.

Fire is a threat to containment!

MEK

3.3 Storing Cylinders

?3.3.8Protect cylinders from any object that will produce a cut or other abrasion in the surface of the metal….

3.3 Storing Cylinders Cont’d

3.3.8….

Do not store cylinders near elevators or gangways, or in locations where heavy moving objects may strike or fall on them….

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Proper nesting supports all cylinders by contact at three points

At gas manufacturers and

distributors not user work sites, proper nesting is considered safe storage by the compressed gas industry.

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3.4 Withdrawing Cylinder Content

• Handling

• Identification

• Removing cap

• Properly supported

• Pressure regulating devices

• Connections

3.4.2 If cylinder content is not

identified by marking, return cylinder to the supplier without using.

3.4 Withdrawing Cylinder Content

I’m not labeled!

!

3.4 Withdrawing Cylinder Content

3.4.4Before using a cylinder,

be sure it is properly supported to prevent it from being knocked over.

3.4.5 Suitable

pressure regulating devices must be used in all cases where gas is admitted to systems having pressure rating limitations lower than the cylinder pressure.

3.4 Withdrawing Cylinder Content

3.4.6 Never force connections that do not fit.

3.4 Withdrawing Cylinder Content

3.4.7 Where compressed gas cylinders

are connected to a manifold, such a manifold and its related equipment, such as

regulators, must be of proper design.

3.4 Withdrawing Cylinder Content

F – Flash arrestor chamberG – Escape pipeH – Cylinder

connection pipeJ – Check valve

and drain plugK – Acetylene cylinders

A

B

C

D

E

F

G

J

KK

H

Stationary acetylene cylinder manifold and other equipment

A – Line valveB – Release valveC – Filler plugD – Header pipeE - Regulator

3.4.8 Regulators, gages, hoses and other appliances provided for use with a particular gas or group of gases must not be used on cylinders containing gases having

different chemical properties unless information obtained from the supplier indicates that this can be done safely.

3.4 Withdrawing Cylinder Content

Acetylene regulator and

oxygen cylinders

• 3.4.9• Open cylinder valve slowly. Point the valve

opening away from yourself and other persons. • Never use wrenches or tools except those

provided or approved by the gas manufacturer. • Avoid the use of a wrench on valves equipped with

handwheels. • Never hammer the valve wheel in attempting to

open or close the valve. • For valves that are hard to open, or frozen

because of corrosion, contact the supplier for instructions.

3.4 Withdrawing Cylinder Content

• 3.4.11 Never use compressed gases where the cylinder is apt to be contaminated by the feedback of process materials unless protected by suitable traps or check valves.

• 3.4.13 Before a regulator is removed from a cylinder, close the cylinder valve and release all pressure from the regulator.

3.4 Withdrawing Cylinder Content

Indoor cylinder storage• Well protected• Well ventilated• Dry

• Twenty feet from flammable or combustible materials

20 Feet

FuelGas

3.5 Flammable Gases

Oxygen

3.5.1 Do not store cylinders near highly flammable solvents, combustible waste material and similar substances, or near unprotected electrical connections, gas flames or other sources of ignition.

3.5 Flammable Gases

3.5.2

Never use a flame to detect flammable gas leaks.

Use soapy water.

3.5 Flammable Gases

3.5.3

Do not store reserve stocks of cylinders containing flammable gases with cylinders containing oxygen.

3.5 Flammable Gases

FuelGasFuel

GasOxygen

3.6.1Personnel handling and using poison

gases should have available for immediate use gas masks or self-contained breathing apparatus of a design approved by U.S. Bureau of Mines for the particular service desired.

3.6 Poison Gases