Program Policy Manual - VOLUME V - Mine Safety and Health ...

More documents

Recommendations

Info

MSHA PROGRAM POLICY MANUAL VOLUME V Stoppings that normally isolate back entries may be destroyed by the force of an explosion, and accumulations of float coal dust, loose coal or coal dust in the back entries would add fuel to the flame. In citing a violation, the inspector should describe fully the conditions and practices, such as the location, dimensions, etc. Imminent danger conditions normally can be considered to exist when accumulations of coal dust, float coal dust, loose coal, and other combustible materials are exposed to probable explosion and fire ignition sources, and the conditions observed could reasonably be expected to cause death or serious physical harm to a miner if normal mining operations were permitted to proceed in the area before the dangerous conditions are eliminated. There may be times when the inspector's interpretation of what is an accumulation of float coal dust, loose coal and coal dust and/or other combustible materials will differ with the opinion of others. However, the inspector should base his decision upon the facts surrounding each occurrence, and document such facts as the dimensions, type, specific location, and all other related factors. The inspector's decision as to what is an accumulation must be an objective one based on the facts or circumstances surrounding each occurrence. Experience has demonstrated that the loading of loose coal caused by sloughing ribs creates a hazardous condition in that the pillar size can be substantially reduced and the width of the entry or room dangerously increased; therefore, such loose coal shall not be considered accumulations of combustible material if such material is rendered inert by heavy applications of rock dust. However, such loose coal shall not be permitted to accumulate in the roadways or outby timberlines. 75.400-2 Cleanup Program The program referred to by this Section shall be outlined in written form and shall be available to the Secretary or his authorized representative. Consideration shall be given as to whether the program is effective, systematic, and is adequate under normal circumstances to control dangers from float dust, dust and loose coal along beltways, and dust and loose coal in the area between the face and loading point. Observance of quantities of inadequately inerted loose coal or coal dust throughout various areas of the mine during a single inspection, or from shift to shift, or from day to day, should be taken into consideration and is a strong indication that a systematic and effective cleanup program is not in operation. This section is not to be cited. However, if excessive accumulations of combustible material are found, a citation under Section 75.400 February 2003 (Release V-33) 49
MSHA PROGRAM POLICY MANUAL VOLUME V should be issued. 75.402 Rock Dusting If worked-out areas which are not rock-dusted are near active working areas and the rock-dusting can be done safely, they shall be rock-dusted in accordance with this Section. It would be unwise for an inspector to require rock-dusting of worked-out areas if miners would be exposed to potentially serious hazards such as bad roof, poor ventilation, etc. Nevertheless, where high-pressure rock-dusting machines are available, inspectors shall require that these machines be used at the outby edges of abandoned areas to rock-dust as much of the area that can be done safely. 75.403 Maintenance of Incombustible Content of Rock Dust Provided the percentages of incombustible content specified in this Section are maintained, rock dust may be applied wet. Wet rock dust shall be limited to rib and roof surfaces in the face areas and shall not be used for redusting mine surfaces. In such applications, only limestone or marble dust which meets the specification contained in Section 75.2(d) shall be used. The application shall be at the rate of not less than 3 ounces of dust per square foot of surface, and shall be by a mixture of not more than 6 to 8 gallons of water with 100 pounds of dust, whether by premixed slurry or by mixing at the nozzle of a hose to assure that the mixture is not too fluid and that sufficient dust adheres to the surfaces. After the wet rock dust dries, additional dry rock dust shall be applied to all surfaces to meet applicable standards. Wet rock-dusting of ribs and roof does not eliminate the necessity for dry rock-dusting the floor. February 2003 (Release V-33) 50
Page 1 and 2:
MSHA PROGRAM POLICY MANUAL VOLUME V
Page 3 and 4:
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14: MSHA PROGRAM POLICY MANUAL VOLUME V
Page 63: MSHA PROGRAM POLICY MANUAL VOLUME V
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
MSHA PROGRAM POLICY MANAUL VOLUME V
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
show all

Program Policy Manual - VOLUME V - Mine Safety and Health ...

Create successful ePaper yourself

Delete template?

Save as template?