[Code of Federal Regulations]

[Title 30, Volume 1]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 30CFR33.37]



[Page 168-169]

 

                       TITLE 30--MINERAL RESOURCES

 

  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR

 

PART 33_DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL 

MINES--Table of Contents

 

                       Subpart C_Test Requirements

 

Sec.  33.37  Test procedure.



    (a) Roof drilling: Drilling shall be done in friable strata, similar 

to the roof in the Bureau's Experimental Mine, which tends to produce 

large scale-like cuttings.

    (b) Horizontal drilling: Drilling shall be done in strata comparable 

in hardness to that of coal-mine draw slate. Holes shall be started near 

the roof of the test space under conditions simulating the drilling of 

draw slate in coal mining.

    (c) Down drilling: Drilling shall be done in typical mine floor 

strata with a pneumatic percussion-type drill. Five holes shall be 

drilled vertically and five holes shall be drilled at an angle.

    (d) At MSHA's discretion drilling in ``on site'' strata may be 

acceptable in



[[Page 169]]



lieu of strata requirements in paragraphs (a), (b), and (c) of this 

section. (See Sec.  33.20(a).)