Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › SPECIALIZED OPERATIONS › Part W - Powered Industrial Trucks (Forklifts) › Section 296-307-52011 - Requirements for determining which trucks to use in specific hazardous environments

Current through Register Vol. 24-14, July 15, 2024
Following are the minimum truck types required in specific
					 hazardous environments. The employer may choose to use industrial trucks having
					 greater safeguards. Tables W-1 and W-2 give specific vehicle usage information
					 by Group and Class.
TABLE W-1
SUMMARY TABLE ON USE OF INDUSTRIAL TRUCKS IN VARIOUS
					 LOCATIONS
CLASSES (Description of classes)
GROUPS (Examples of locations or
							 atmosphere in classes and groups)
DIVISIONS (Nature of hazardous
							 conditions)
UNCLASSIFIED
No group designations in Unclassified
No divisions in
							 Unclassified
Locations not possessing atmospheres as described in
							 other columns.
Piers and wharves inside and outside
							 general storage, general industrial or commercial properties
CLASS I LOCATIONS
A
B
C
D
1
2
Locations in which flammable gases or vapors are, or
							 may be, present in the air in quantities sufficient to produce explosive or
							 ignitible mixtures.
Acetylene
Hydrogen
Ethyl ether
Gasoline Naphtha Alcohols Acetone Lacquer solvent
							 Benzene
Conditions exists continuously, intermittently, or
							 periodically under normal operating conditions.
Condition may occur due to accidentally, for example,
							 due to a puncture of a storage drum.
CLASS II LOCATIONS
E
F
G
1
2
Locations which are hazardous because of the presence
							 of combustible dust.
Metal dust
Carbon black Coal dust Coke dust
Grain dust Flour dust Starch dust Organic dust
Explosive mixture may be present under normal
							 operating conditions, or where failure of equipment may cause the condition to
							 exist simultaneously with arcing or sparking of electrical equipment, or where
							 dusts of an electrically conducting nature may be present.
Explosive mixture not normally present, but where
							 deposits of dust may cause heat rise in electrical equipment, or where such
							 deposits may be ignited by arcs or sparks from electrical equipment.
CLASS III LOCATIONS
Class III has no groups
1
2
Locations where easily ignitible fibers or flyings are
							 present but not likely to be in suspension in quantifies sufficient to produce
							 ignitible mixtures.
Baled waste, cocoa fiber, cotton,
							 excelsior, hemp, istle, jute, kapok, oakum, sisal, Spanish moss, synthetic
							 fibers, tow.
Locations in which easily ignitible fibers or
							 materials producing combustible flyings are handled, manufactured, or
							 used.
Locations in which easily ignitible fibers arestored
							 or handled (except in the process of manufacture).
TABLE W-2
AUTHORIZED USES OF TRUCKS BY TYPES IN GROUPS OF CLASSES
					 AND DIVISIONS
UNCLASSIFIED
CLASS I
CLASS II
CLASS III
DIV I
DIV II
DIV I
DIV II
DIV I
DIV II
Groups in classes
None
A
B
C
D
A
B
C
D
E
F
G
E
F
G
None
None
Type of truck authorized:
Diesel
:
Type D................
Type DS...............
Type DY..............
D**..
......
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...
...
...
...
...
...
...
...
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...
...
...
DS..
. DY...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
DS...
DY...
...
...
DY...
...
DS
DY
Electric
:
Type E................
Type ES...............
Type EE...............
Type EX...............
E**..
......
.....
.....
...
...
......
...
...
......
...
...
......
...
...
...
EX...
...
...
...
...
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......
...
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ES...
EE...
EX...
...
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...
...
...
...
EX...
...
...
...
EX..
...
...
...
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...
...
...
...
...
ES...
EE...
EX...
...
...
EE..
. EX...
E
ES
EE
EX
Gasoline
:
Type G................
Type GS...............
G**...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
GS...
...
...
...
...
...
...
...
...
...
...
...
GS...
...
...
GS
LP-Gas:
:
Type LP.................
Type LPS................
LP**..
....
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
LPS...
...
...
...
...
...
...
...
...
...
...
...
LPS...
...
...
LPS
** Trucks conforming to these types may also be
					 used.
(1) Powered industrial trucks
				  are prohibited in atmospheres with a hazardous concentration of:
(a) Acetaldehyde;
(b) Acetylene;
(c) Butadiene;
(d) Cyclopropane;
(e) Diethyl ether;
(f) Ethylene;
(g) Ethylene oxide;
(h) Hydrogen (or gases or vapors equivalent
				  in hazard to hydrogen, such as manufactured gas);
(i) Isoprene;
(j) Propylene oxide; or
(k) Unsymmetrical dimethyl hydrazine (UDMH).
(i) Only approved EX trucks, or other trucks
				  approved by the manufacturer, may be used in atmospheres containing hazardous
				  concentrations of metal dust, including:
(A)
				  Aluminum, magnesium, and their commercial alloys;
(B) Other dusts of similarly hazardous
				  characteristics; or
(C) In
				  atmospheres containing:
(I) Carbon
				  black;
(II) Coal; or
(III) Coke dust.
(ii) In atmospheres where dust of
				  magnesium, aluminum or aluminum bronze may be present, fuses, switches, motor
				  controllers, and circuit breakers of trucks must have enclosures specifically
				  approved for such locations.