compressed gas safety · 2020. 10. 20. · compressed gas association inc. cga c-6 1968 cylinder...
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Compressed Gas Safety
Compressed Gases-
General Requirements
-
Regulations
• MIOSHA Part 12 Welding and Cutting
• MIOSHA Part 56 Storage and Handling
of Liquified Petroleum Gases
• MIOSHA Part 69 Compressed Gases:
Acetylene, Hydrogen, Oxygen, and
Nitrous Oxide
• OSHA 1910 Subpart H – Hazardous
Materials
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OSHA STANDARDS
29 CFR 1910 General Industry
Specific OSHA regulations
applying to compressed
gas cylinders
1910.253 Oxygen-fuel gas
welding and cutting
1910.101 Compressed gases
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Compressed gas cylinder types
High Pressure Low Pressure
Comparative sizes
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Compressed gas cylinder types
High Low Acetylene Cryogenic
> 900PSIG
< 900PSIG ..
..
Fusable
Plug
Fusable
Plug
Porous
Mass
Acetone
Solvent
42%
Volume
Very
Very
Cold
LiquidCO2CL2NO2
AR
O2H2N2
Vapor
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Hazards
Pressure related
• Missile hazard
• Shrapnel
• Pressure cutting
Content (hazardous material precautions)
• Flammable
• Toxic
• Corrosive
• Asphyxiant
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Inspection of compressed
gas cylinders
• Each employer shall
determine thatcompressed 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
cylindersreceived
-
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
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9
Cylinder Markings
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(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 gases
General requirements
Applicable to
Suppliers
and
distributorsfilling compressed
gas
cylinders
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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 metal
Distortion of the cylinderMelted out fuse plugs
Burning or melting of valve
Fire DamageCylinders 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
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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
-
Never tamper with the
safety relief devices in
valves or cylinders
Never attempt to repair or
to alter cylinders, valves, or
safety relief devices.
Use Compatible Regulators
General
-
Never use cylinders
as rollers, supports, or for any purpose other than
to contain the content as
received
General
Big &
heavy
-
Keep cylinder valve closed at all times, except when the cylinder is in active use.
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.
General
-
Verify Valve Closure
22
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Do 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 groundingcompressed gas cylinders and allowing them to be burned by electric welding arc.
General
Insulator
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• Caps in place
• Lifting
• Dropping
• Lifting with magnets
• Dragging
Moving Cylinders
-
Do not lift cylinders by the
cap.
Never drop cylinders nor
permit them to strike against
each other or against other
surfaces violently.
Moving Cylinders
Concrete
-
Never handle a
cylinder with a lifting
magnet.
Avoid dragging or
sliding cylinders.
Electro-magnet
-
Moving Cylinders
Use suitable hand
truck, fork truck, roll
platform or similar
device with
cylinder firmly
secured for transporting and
unloading. !
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Construction Lift Rig
28
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Storing Cylinders
• Ventilation
• Posting
• Separation (different types)
• Separation (charged & empty)
• Storage rooms
• Highly flammable substances
• Avoid dampness
• Protection of cylinders
• High Temperature
?
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Storage
30
-
Properly Secured
31
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Storing Cylinders
Do not store
cylinders near
highly flammable
substances such
as oil, gasoline or
waste.
Fire is a
threat to
containment!
MEK
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Storing Cylinders
Protect
cylinders from any object that will
produce a cut or
other abrasion in
the surface of the
metal….
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Storing Cylinders Cont’d
Do not storecylinders 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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Withdrawing Cylinder Content
• Handling
• Identification
• Removing cap
• Properly
supported
• Pressure
regulating
devices
• Connections
-
If cylinder content is not identified by
marking, return cylinder to the
supplier without using.
Withdrawing Cylinder Content
I’m not
labeled!
!
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Withdrawing Cylinder Content
Before using a
cylinder,
be sure it is
properly
supportedto prevent it from
being knocked
over.
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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.
Withdrawing Cylinder Content
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Never force
connections.
Withdrawing Cylinder Content
-
Where compressed gas cylinders are connected
to a manifold, such a manifold and its related equipment, such as regulators, must be of
proper design.
Withdrawing Cylinder Content
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F – Flash arrestor chamber
G – Escape pipe
H – Cylinder
connection pipe
J – Check valve
and drain plug
K – Acetylene cylinders
A
B
C
D
E
F
G
J
KK
H
Stationary acetylene cylinder manifold and other equipment
A – Line valve
B – Release valve
C – Filler plug
D – Header pipe
E - Regulator
-
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.
Withdrawing Cylinder Content
Acetylene
regulator and
oxygen cylinders
-
• 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.
Withdrawing Cylinder Content
-
• 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.
• Before a regulator is removed
from a cylinder, close the
cylinder valve and release all
pressure from the regulator.
Withdrawing Cylinder Content
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Indoor cylinder storage
• No ignition sources
• Well ventilated
• Dry
• Twenty feet from flammable or combustible materials
20 Feet
Fuel
Gas
Flammable Gases
O
x
y
g
e
n
-
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.
Flammable Gases
-
Never use a flame to detect flammable gas
leaks.
Use soapy water.
Flammable Gases
-
Flammable gases must be stored > 20 feet
away from cylinders containing oxygen.
Flammable Gases
Fuel
GasFuel
GasO
x
y
g
e
n
-
Personnel handling and using poison gases should have approved gas masks or SCBA available for immediate use
Use PPE appropriate to the hazard
Poison Gases
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51
Cryogenic Liquids
• Safety glasses
• Face shield
• Loose fitting clothes
• Loose fitting insulated
gloves
• Be aware of
expansion hazards
-
Questions?
-
Acetylene cylindersThe decomposition characteristics
of acetylene gas are avoided:
• By providing a porous masspacking 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
..
..
Fusable
Plug
Fusable
Plug
Porous
Mass
Acetone
Solvent
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..
..
Fusable
Plug
Fusable
Plug
Porous
Mass
Acetone
Solvent
42%
Volume
-
"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. FSee other definitions at 49 CFR 173.115
29 CFR 1910.1200
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