 ... square inch. 2. Air lines shall be grounded at the compressor and, if possible, at other lowresistance ground connections along the lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric...  Miners' Circular - Page 91by United States. Bureau of Mines - 1945Full view - About this book
 | Administrative law - 1939 - 1242 pages
...lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall...they cross electric wires or underneath the track. (iii) Unions shall be installed in steel air lines at not more than 1,000-foot intervals. (iv) Shut-off... | |
 | United States. Congress. House. Committee on Education and Labor - 1949 - 564 pages
...lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall...they cross electric wires or underneath the track. 3. Unions shall be installed in steel air lines at not more than 1,000-foot intervals. 4. Shut-off valves... | |
 | United States. Congress. Senate. Committee on Labor and Public Welfare - 1949 - 332 pages
...lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall...they cross electric wires or underneath the track. 3. Unions shall be installed in steel air lines at not more than 1,000-foot Intervals. Shut-off valves... | |
 | United States. Congress. House. Committee on Education and Labor - 1952 - 518 pages
...lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall...cross electric wires or underneath the track. "(3) Unions shall be installed in steel air lines at not more than one thousandfoot intervals. "(4) Shut-off... | |
 | United States. Congress. Senate. Committee on Labor and Public Welfare - 1952 - 1460 pages
...lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall...they cross electric wires or underneath the track. 4. Shut-off valves shall be Installed every 1,000 feet in all Airdox lines and, In all branch lines,... | |
 | United States. Congress. Senate. Labor and Public Welfare - 1965 - 480 pages
...lines, such as at borehole casing?. They shall -not be connected in any way to tracks, waterlinea, or other electric power return conductors and shall...cross electric wires or underneath the track. "(3) Shntoff valves shall be installed every 1,000 feet in all compressed-air blasting lines and in all... | |
 | United States. Congress. House. Education and Labor - 1969 - 688 pages
...the lines, such as at borehole casing. They shall not be connected in any way to tracks, water lines, or other electric power return conductors, and shall...cross electric wires or underneath the track. (3) Unions shall be installed in steel air lines at not more than 1,000 foot intervals, and insulated couplings... | |
| |
