(1) All magazines in which explosives are
kept or stored shall comply with the requirements of these orders within six
(6) months of the date these rules become effective.
(2)
Location - All
magazines in which explosives are kept or stored shall be located at a distance
from buildings, railroads and highways in conformity with the Quantity and
Distance Table in these rules.
(3)
Barricades - The term barricaded shall mean a physical
barrier either natural or artificial around the magazine, to protect life and
limb in buildings and on highways, railroads and railways, from damage by
premature explosions. Methods of barricading are as follows:
1. Locate the magazine in an isolated ravine;
or
2. Excavate at foot or side of
hill sufficiently deep to provide protection on the sides and end of the
magazine. A two (2) foot space shall be allowed between the magazine and the
excavated sides; or
3. Construct a
substantial barricade of concrete or timber or earth or stone bank.
(4) All magazines containing more
than two hundred (200) pounds of explosives shall either be barricaded or the
distance from inhabited buildings, public railways and public highways shall be
doubled.
(5) When as much as two
hundred (200) pounds of explosives is kept on hand, it shall be stored in a
magazine constructed of one of the following materials, and shall be termed as
Class "A" Magazine:
FRAME: The walls shall be constructed of two inch by four inch
(2" x 4") studding with a two inch (2") plank outside wall. The outside wall
shall be lined with tongue and groove lumber. The outer wall shall be covered
with No. 26 gauge galvanized iron or sheet steel on the outside. The space
between the outer and the inner wall shall be filled with dry, coarse sand (not
crushed stone or gravel). All dry timber shall be well seasoned and free from
loose knots wind shakes, bark edges or decay.
BRICK: or RUBLE MASONRY: The walls shall be eight (8) inches in
thickness. The bricks shall be of medium soft variety, or the masonry blocks or
granite, laid in cement mortar containing not over twenty-five percent (25%)
lime.
CONCRETE: The walls shall be six inches (6") in thickness
constructed of four (4) parts sand and one (1) part cement.
TILE: The walls shall be constructed of either six inch (6") or
eight inch (8") tile. The space in the tile shall be filled with dry, coarse
sand (not crushed stone or gravel).
ROCK: In solid ground or rock ("L"shaped magazines are
recommended.)
(a) The foundation shall
be of stone laid in cement, concrete or brick piers; or a solid foundation may
be used.
(b) Magazines of less than
thirty thousand (30,000) pounds capacity shall have seven-eighths (7/8) inch
tongue and groove flooring. Magazines of larger capacity shall have double
floorings.
(c) All nail heads shall
be counter sunk. No metal shall be exposed within the buildings.
(d) The door shall be constructed of at least
three (3) layers of seven-eighths (7/8) inch hardwood lumber and metal covered
on outside.
(e) The roof shall be
constructed of at least one (1) inch lumber and covered with No. 26 gauge
galvanized iron.
(f) For
ventilation, four inch by six inch (4" x 6"), or equivalent, openings shall be
spaced not more than five feet (5') center to center just below the roof line
and at the floor level, covered with wire screen. The floor and ceiling shall
be constructed to within two inches (2") of the walls in order to provide air
circulation.
(g) The magazine shall
be located in an isolated place. A damp location shall be avoided. All drain
ditches around the magazines shall be kept open at all times.
(6)
Size of
Magazines - The size of the magazine depends upon the amount of
explosives to be stored. The dimensions given in the following table are
suitable for the amounts indicated.
MAIN STORAGE MAGAZINES
DIMENSIONS
Quantity
Widths
Lengths
1,000 lbs. 6 feet 6 feet
2,000 lbs. 6 feet 7 feet
5,000 lbs. 8 feet 9 feet
10,000 lbs. 10 feet 12 feet
15,000 lbs. 12 feet 12 feet
20,000 lbs. 12 feet 16 feet
25,000 lbs 12 feet 18 feet
30,000 lbs 12 feet 20 feet
40,000 lbs 14 feet 22 feet
50,000 lbs 14 feet 24 feet
(a) When less than two hundred (200) pounds
of explosives are kept on hand, it shall be stored in a magazine of the
following construction, which is termed a Class "B" Magazine:
(7)
Class
"B" Magazine and Construction - The principle of construction is
simply that of placing one substantial box inside of another with a five inch
(5") space filled with dry coarse sand (not gravel or crushed rock).
1. The outer box shall be built on the type
of an ordinary contractor's tool box, equipped with sloping hinged
lid.
2. The box shall be
constructed of seven-eights (7/8) inch tongue and groove boards or one and
one-eighth (1-1/8) inch plan lumber. The outside of the box shall be covered
with not less than No. 24 gauge sheet iron.
3. The outer box will be one (1) foot longer,
one (1) foot wider and six (6) inches deeper than the inner box so that when
the inner box is set inside the outer box the tops will be level with each
other and there will be a five (5) inch space on all sides for coarse sand
filling. The inner box shall be set inside of the larger box and fastened into
place.
4. The inside of all boxes
shall be surfaced. No nail, bolt, or screwheads shall be exposed on the inside
of the inner box.
5. At the top of
each box, on the sides and ends, but one-fourth (1/4) inch by two (2) inch
notches, spaced about (1) one foot apart, and not directly opposite.
6. Set the box (magazine) so that it is level
and support it either on wooden sills, bricks, or piers; keep bottom of the
magazine about six (6) inches off the ground.
7. Fill space between boxes with dry, coarse
sand (not gravel or crushed stone) to within one-fourth (1/4) inch of the top
of boxes. To prevent sand from falling into the storage space or into a
shifting position, a cover may be placed over the sand space. All magazines
shall be provided with substantial locks.
(8)
Marking
Magazines - magazines must be designated by conspicuously posted
signs with the words "Magazine", "Explosives", "Dangerous" legibly printed
thereon. Such signs shall be so placed that a bullet passing through the sign
will not enter the magazine.
(9)
Detonator Storage Separate - Blasting caps and
electric blasting caps shall not be stored in the same magazine with dynamite
or powder, but shall be stored in a magazine of similar construction as the
dynamite or powder magazines, and not nearer than fifty feet (50') to any other
explosives magazine
Author: Marcus Davis, Workers' Compensation
Examiner.
