§77.1434. Retirement criteria.
30 C.F.R. § 77.1434
Unless damage or deterioration is removed by cutoff, wire ropes shall be removed from service when any of the following conditions occurs:
The number of broken wires within a rope lay length, excluding filler wires, exceeds either—
Five percent of the total number of wires; or
Fifteen percent of the total number of wires within any strand;
On a regular lay rope, more than one broken wire in the valley between strands in one rope lay length;
A loss of more than one-third of the original diameter of the outer wires;
Rope deterioration from corrosion;
Distortion of the rope structure;
Heat damage from any source;
Diameter reduction due to wear that exceeds six percent of the baseline diameter measurement; or
Loss of more than ten percent of rope strength as determined by nondestructive testing.
Notes, amendments, and revision history
Authority
Authority: Sections 77.1430 through 77.1438 issued under sec. 101, Federal Mine Safety and Health Act of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30 U.S.C. 811).
Source
Source: Sections 77.1430 through 77.1438 appear at 48 FR 53241, Nov. 25, 1983, unless otherwise noted.
Authority
Authority: 30 U.S.C. 811.
Source
Source: 36 FR 9364, May 22, 1971, unless otherwise noted.