§75.1434. Retirement criteria.

30 C.F.R. § 75.1434

Unless damage or deterioration is removed by cutoff, wire ropes shall be removed from service when any of the following conditions occurs:

(a)

The number of broken wires within a rope lay length, excluding filler wires, exceeds either—

(1)

Five percent of the total number of wires; or

(2)

Fifteen percent of the total number of wires within any strand;

(b)

On a regular lay rope, more than one broken wire in the valley between strands in one rope lay length;

(c)

A loss of more than one-third of the original diameter of the outer wires;

(d)

Rope deterioration from corrosion;

(e)

Distortion of the rope structure;

(f)

Heat damage from any source;

(g)

Diameter reduction due to wear that exceeds six percent of the baseline diameter measurement; or

(h)

Loss of more than ten percent of rope strength as determined by nondestructive testing.

Notes, amendments, and revision history

Source: Sections 75.1429 through 75.1438 appear at 48 FR 53239, Nov. 25, 1983, unless otherwise noted.

Authority: 30 U.S.C. 811, 813(h), 957.

Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.