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1910.109(g)(2) Fixed Location Mixing
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Equipment used for mixing blasting agents shall conform to the requirements of this subdivision.
The design of the mixer shall minimize the possibility of frictional heating, compaction, and especially confinement. All bearings and drive assemblies shall be mounted outside the mixer and protected against the accumulation of dust. All surfaces shall be accessible for cleaning.
Mixing and packaging equipment shall be constructed of materials compatible with the fuel-ammonium nitrate composition.
Suitable means shall be provided to prevent the flow of fuel oil to the mixer in case of fire. In gravity flow systems an automatic spring-loaded shutoff valve with fusible link shall be installed.
The provisions of this subdivision shall be considered when determining blasting agent compositions.
The sensitivity of the blasting agent shall be determined by means of a No. 8 test blasting cap at regular intervals and after every change in formulation.
Oxidizers of small particle size, such as crushed ammonium nitrate prills or fines, may be more sensitive than coarser products and shall, therefore, be handled with greater care.
No hydrocarbon liquid fuel with flashpoint lower than that of No. 2 diesel fuel oil 125 deg. F. minimum shall be used.
Crude oil and crankcase oil shall not be used.
Metal powders such as aluminum shall be kept dry and shall be stored in containers or bins which are moisture-resistant or weathertight. Solid fuels shall be used in such manner as to minimize dust explosion hazards.
Peroxides and chlorates shall not be used.
All electrical switches, controls, motors, and lights located in the mixing room shall conform to the requirements in subpart S of this part for Class II, Division 2 locations; otherwise they shall be located outside the mixing room. The frame of the mixer and all other equipment that may be used shall be electrically bonded and be provided with a continuous path to the ground.
Safety precautions at mixing plants shall include the requirements of this subdivision.
Floors shall be constructed so as to eliminate floor drains and piping into which molten materials could flow and be confined in case of fire.
The floors and equipment of the mixing and packaging room shall be cleaned regularly and thoroughly to prevent accumulation of oxidizers or fuels and other sensitizers.
The entire mixing and packaging plant shall be cleaned regularly and thoroughly to prevent excessive accumulation of dust.
Smoking, matches, open flames, spark-producing devices, and firearms (except firearms carried by guards) shall not be permitted inside of or within 50 feet of any building or facility used for the mixing of blasting agents.
The land surrounding the mixing plant shall be kept clear of brush, dried grass, leaves, and other materials for a distance of at least 25 feet.
Empty ammonium nitrate bags shall be disposed of daily in a safe manner.
No welding shall be permitted or open flames used in or around the mixing or storage area of the plant unless the equipment or area has been completely washed down and all oxidizer material removed.
Before welding or repairs to hollow shafts, all oxidizer material shall be removed from the outside and inside of the shaft and the shaft vented with a minimum one-half inch diameter opening.
Explosives shall not be permitted inside of or within 50 feet of any building or facility used for the mixing of blasting agents.
Buildings used for the mixing of blasting agents shall conform to the requirements of this section.
Buildings shall be of noncombustible construction or sheet metal on wood studs.
Floors in a mixing plant shall be of concrete or of other nonabsorbent materials.
All fuel oil storage facilities shall be separated from the mixing plant and located in such a manner that in case of tank rupture, the oil will drain away from the mixing plant building.
The building shall be well ventilated
Heating units which do not depend on combustion processes, when properly designed and located, may be used in the building. All direct sources of heat shall be provided exclusively from units located outside the mixing building.
All internal-combustion engines used for electric power generation shall be located outside the mixing plant building, or shall be properly ventilated and isolated by a firewall. The exhaust systems on all such engines shall be located so any spark emission cannot be a hazard to any materials in or adjacent to the plant.
Related Code Sections
1910.109(g)(2) Hazardous Materials, Fixed Location Mixing
, and lights located in the mixing room shall conform to the requirements in subpart S of this part for Class II, Division 2 locations; otherwise they shall ...
OSHA 1910 General Industry > H Hazardous Materials > 1910.109 Explosives and Blasting Agents > 1910.109(g) Blasting Agents > 1910.109(g)(2) Fixed Location Mixing
1910.109(g)(2)(ii)(e) Hazardous Materials,
of heat shall be provided exclusively from units located outside the mixing building ...
OSHA 1910 General Industry > H Hazardous Materials > 1910.109 Explosives and Blasting Agents > 1910.109(g) Blasting Agents > 1910.109(g)(2) Fixed Location Mixing > 1910.109(g)(2)(ii) > 1910.109(g)(2)(ii)(e)
1910.109(g)(2)(ii)(b) Hazardous Materials,
Floors in a mixing plant shall be of concrete or of other nonabsorbent materials ...
OSHA 1910 General Industry > H Hazardous Materials > 1910.109 Explosives and Blasting Agents > 1910.109(g) Blasting Agents > 1910.109(g)(2) Fixed Location Mixing > 1910.109(g)(2)(ii) > 1910.109(g)(2)(ii)(b)
1910.109(g)(2)(iii) Hazardous Materials,
Equipment used for mixing blasting agents shall conform to the requirements of this subdivision ...
OSHA 1910 General Industry > H Hazardous Materials > 1910.109 Explosives and Blasting Agents > 1910.109(g) Blasting Agents > 1910.109(g)(2) Fixed Location Mixing > 1910.109(g)(2)(iii)
1910.109(g)(2)(iii)(b) Hazardous Materials,
Mixing and packaging equipment shall be constructed of materials compatible with the fuel-ammonium nitrate composition ...
OSHA 1910 General Industry > H Hazardous Materials > 1910.109 Explosives and Blasting Agents > 1910.109(g) Blasting Agents > 1910.109(g)(2) Fixed Location Mixing > 1910.109(g)(2)(iii) > 1910.109(g)(2)(iii)(b)