 ... when tested at a point not less than 12 inches from the roof, face, or rib. (h) "Letter of certification...  Miners' Circular - Side 85av United States. Bureau of Mines - 1945Uten tilgangsbegrensning - Om denne boken
 | 1939 - 1242 sider
...has been corrected. (5) When the methane content of air in face operations exceeds 1 percent at any point not less than 12 inches from the roof, face, or rib, as determined by a permissible methane detector, a permissible flame safety lamp, or by chemical analysis,... | |
 | 1978 - 996 sider
...shall be removed from misfired shells before the shells are removed from the face. • • • • • (11) Cardox shells shall not be heated. This does...apply to heat generated when the shell is discharged. § 17.19 Pari 18 SUBCHAPTER D— ELECTRICAL EQUIPMENT, LAMPS, METHANE DETECTORS; TESTS FOR PERMISSIBILITY;... | |
 | 1990 - 830 sider
...Methane accumulations in face areas. [STATUTORY PROVISIONS] If at any time the air at any working place, when tested at a point not less than 12 inches from the roof, face, or rib, contains 1.0 volume per centum or more of methane, changes or adjustments shall be made at once in... | |
 | 1998 - 740 sider
...determined by air analysis to contain 0.25 percent or more (by volume) of methane in any open workings when tested at a point not less than 12 inches from the roof, face, or rib. (h) Letter of certification means a for-mal document Issued by MSHA stating that a methane-monitoring... | |
 | 1987 - 758 sider
...Methane accumulations in face areas. [STATUTORY PROVISIONS] If at any time the air at any working place, when tested at a point not less than 12 inches from the roof, face, or rib, contains 1.0 volume per centum or more of methane, changes or adjustments shall be made at once in... | |
 | United States. Congress. Senate. Committee on Labor and Public Welfare - 1949 - 332 sider
...fire should be made as soon as practicable after blasting in a place in any mine. 14. A blast should not be fired in any place where methane can be detected with a permissible flame safety lamp. 15. Only the person who places the charge should remove the shunts and... | |
 | United States. Congress. House. Committee on Education and Labor - 1949 - 564 sider
...fire should be made as soon as practicable after blasting in a place in any mine. 14. A blast should not be fired in any place where methane can be detected with a permissible flame safety lamp. 15. Only the person who places the charge should remove the shunts and... | |
 | United States. Congress. House. Committee on Education and Labor - 1949 - 564 sider
...fire should be made as soon as practicable after blasting in a place in any mine. 14. A blast should not be fired in any place where methane can be detected with a permissible flame safety lamp. 15. Only the person who places the charge should remove the shunts and... | |
 | 1998 - 740 sider
...determined by air analysis to contain 0.25 percent or more (by volume) of methane In any open workings when tested at a point not less than 12 inches from the root face, or rib. (h) Letter of certification means a for mal document issued by MSHA statinf that... | |
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