[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR27.39]

[Page 146]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 27--METHANE-MONITORING SYSTEMS--Table of Contents
 
                      Subpart C--Test Requirements
 
Sec. 27.39  Tests to determine resistance to vibration.

    (a) Laboratory tests for reliability and durability. Components, 
subassemblies, or assemblies that are to be mounted on permissible and 
approved equipment shall be subjected to two separate vibration tests, 
each of one-hour duration. The first test shall be conducted at a 
frequency of 30 cycles per second with a total movement per cycle of \1/
16\-inch. The second test shall be conducted at a frequency of 15 cycles 
per second with a total movement per cycle of \1/8\-inch. Components, 
subassemblies, and assemblies shall be secured to the vibration testing 
equipment in their normal operating positions (with shock mounts, if 
regularly provided with shock mounts). Each component, subassembly and 
assembly shall function normally during and after each vibration test.
    Note: The vibrating equipment is designed to impart a circular 
motion in a plane inclined 45 deg. to the vertical or horizontal.
    (b) Field tests. MSHA reserves the right to conduct tests to 
determine resistance to vibration in underground workings to verify the 
reliability and durability of a methane-monitoring system or 
component(s) thereof where installed in connection with a piece of 
mining equipment.

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