Except as provided in
this rule applies to the storage of ammonium nitrate in the form of crystals,
flakes, grains, or prills, including fertilizer grade, dynamite grade, nitrous
oxide grade, technical grade, and other mixtures containing 60 percent or more
ammonium nitrate by weight but does not apply to blasting agents.
2. This rule does not apply to the
transportation of ammonium nitrate.
3. The storage of ammonium nitrate and
ammonium nitrate mixtures that are more sensitive than allowed by the
"Definition of Test Procedures for Ammonium Nitrate Fertilizer" (available from
the Fertilizer Institute, 1015 18th Street, N.W., Washington, D.C. 20036) is
4. Nothing in this rule
shall apply to the production of ammonium nitrate or to the storage of ammonium
nitrate on the premise of the producing plant.
5. The standards for ammonium nitrate
(nitrous oxide grade) are those found in the "Specifications, Properties, and
Recommendations for Packaging, Transportation, Storage, and Use of Ammonium
Nitrate", Available from the Compressed Gas Association, Inc., 500 Fifth
Avenue, New York, New York 10036.
1. This rule applies to all persons storing,
having, or keeping ammonium nitrate, and to the owner or lessee of any
building, premises, or structure in which ammonium nitrate is stored in
quantities of 1,000 pounds or more.
2. Approval of large quantity storage shall
be subject to due consideration of the fire and explosion hazards, including
exposure to toxic vapors from burning or decomposing nitrate.
1. Storage buildings shall not have basements
unless the basements are open on at least one side. Storage buildings shall not
be over one story in height.
Storage buildings shall have adequate ventilation, or be of a construction that
will be self- ventilating in the event of fire.
3. The wall on the exposed side of a storage
building within 50 feet of a combustible building, forest, piles of combustible
materials and similar exposure hazards shall be of fire-resistive construction.
In lieu of the fire-resistive wall, other suitable means of exposure protection
such as a free standing wall may be used. The roof coverings shall be Class C
or better, as defined in the Manual on Roof Coverings, NFPA 203M-1970 or latest
4. All flooring in
storage and handling areas shall be of noncombustible materials or protected
against impregnation by ammonium nitrate and shall be without open drains,
traps, tunnels, pits or pockets into which any molten ammonium nitrate could
flow and be confined in the event of fire.
5. The continued use of an existing storage
building or structure not in strict conformity with this Rule may be approved
in cases where such continued use will not constitute a hazard to
6. Buildings and structures
shall be dry and free from water seepage through the roof, walls, and
Ammonium Nitrate in Bags, Drums, or Other Containers.
Bags and Containers
a. Bags and containers used for ammonium
nitrate must comply with specifications and standards required for use in
used on the premises in the actual manufacturing or processing need not comply
with provisions of R614-4-20.D.1.a.
a. Containers of ammonium nitrate shall not
be accepted for storage when the temperature of the ammonium nitrate exceeds
130 degrees F.
b. Bags of ammonium
nitrate shall not be stored within 30 inches of the storage building walls and
c. The height of piles
shall not exceed 20 feet. The width of piles shall not exceed 20 feet and the
length 50 feet except that where the building is of noncombustible construction
or is protected by automatic sprinklers the length of piles shall not be
limited. In no case shall the ammonium nitrate be stacked closer than 36 inches
below the roof or supporting and spreader beams over head.
d. Aisles shall be provided to separate piles
by a clear space of not less than 3 feet in width. At least one service or main
aisle in the storage area shall not be less than 4 feet in width.
Storage of Bulk
1. Warehouses shall have
adequate ventilation or be capable of adequate ventilation in case of
2. Unless constructed of
noncombustible material or unless adequate facilities for fighting a roof fire
are available, bulk storage structures shall not exceed a height of 40
1. Bins shall be clean and free of materials
which may contaminate ammonium nitrate.
2. Due to the corrosive and reactive
properties of ammonium nitrate, and to avoid contamination, galvanized iron,
copper, lead, and zinc shall not be used in a bin constructed unless suitably
protected. Aluminum bins and wooden bins protected against impregnation by
ammonium nitrate are permissible. The partitions dividing the ammonium nitrate
storage from other products which would contaminate the ammonium nitrate shall
be of tight construction.
ammonium nitrate storage bins or piles shall be clearly identified by signs
reading "Ammonium Nitrate" with letters at least 2 inches high.
1. Piles or bins shall be so sized and
arranged that all material in the pile is moved out periodically in order to
minimize possible caking of the stored ammonium nitrate.
2. Height or depth of piles shall be limited
by the pressure-setting tendency of the product. However, in no case shall
ammonium nitrate be piled higher at any point than 36 inches below the roof or
supporting and spreader beams over head.
3. Ammonium nitrate shall not be accepted for
storage when the temperature of the product exceed 130 degrees F.
4. Dynamite, other explosives, and blasting
agents shall not be used to break up or loosen caked ammonium
1. Ammonium nitrate shall be in
a separate building or shall be separated by approved type fire-walls of not
less than 1 hour fire-resistance rating from storage of organic chemicals,
acids, or other corrosive materials, materials that may require blasting during
processing or handling, compressed flammable and combustible materials or other
contaminating substances, including but not limited to animal fats, baled
cotton, baled rags, baled scrap paper, bleaching powder, burlap or cotton bags,
caustic soda, coal, coke, charcoal, cork, camphor, excelsior, fibers of any
kind, fish oils, fish meal, foam rubber, hay, lubricating oil, linseed oil, or
other oxidizable or drying oils, naphthalene, oakum, oiled clothing, oiled
paper, oiled textiles, paint straw, sawdust, wood shavings, or vegetable oils.
Walls referred to in this subdivision need extend only to the underside of the
2. In lieu of separation
walls, ammonium nitrate may be separated from the materials referred to in
R614-4-20.H.1. by a space of at least 30 feet.
Flammable liquids such as gasoline,
kerosene, solvents, and light fuel oils shall not be stored on the premises
except when such storage conforms to
when walls and sills or curbs are provided in accordance with R614-4-20.H.1. or
LP-gas shall not be stored on
the premises except when such storage conforms to
Sulfur and finely divided metals shall not
be stored in the same building with ammonium nitrate except when such storage
2. Explosives and
blasting agents shall not be stored in the same building with ammonium nitrate
except on the premises of makers, distributors, and user-compounders of
explosives or blasting agents.
Where explosives or blasting agents are stored in separate buildings, other
than on the premises of makers, distributors, and user-compounders of
explosives or blasting agents, they shall be separated from the ammonium
nitrate by the distances and/or barricades specified in
but not less than 50 feet.
Storage and/or operations on the premises of makers, distributors and
user-compounders of explosives or blasting agents shall be in conformity with
through 20. of these rules.
Electrical installations shall conform to
the requirements of 29 CFR 1910
Subpart S, for ordinary locations. They shall
be designed to minimize damage from corrosion.
b. In areas where lightning storms are
prevalent, lightning protection shall be provided. (See the Lightning
Protection Code, NFPA 78-1979).
Provisions shall be made to prevent unauthorized personnel from entering the
ammonium nitrate storage area.
Not more than 2,500 tons of bagged
ammonium nitrate shall be stored in a building or structure not equipped with
an automatic sprinkler system. Sprinkler systems shall be approved type and
installed in accordance with
Suitable fire control devices such as
small hose or portable fire extinguishers shall be provided throughout the
warehouse and in the loading and unloading area. Suitable fire control devices
shall comply with the requirements of
c. Water supplies and fire hydrants shall be
available in accordance with recognized good practices.