30 CFR 57.19021 - Minimum rope strength.

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§ 57.19021 Minimum rope strength.

At installation, the nominal strength (manufacturer's published catalog strength) of wire ropes used for hoisting shall meet the minimum rope strength values obtained by the following formulas in which “L” equals the maximum suspended rope length in feet:

(a) Winding drum ropes (all constructions, including rotation resistant).

For rope lengths less than 3,000 feet: Minimum Value = Static Load × (7.0 − 0.001L)
For rope lengths 3,000 feet or greater: Minimum Value = Static Load × 4.0.

(b) Friction drum ropes.

For rope lengths less than 4,000 feet: Minimum Value = Static Load × (7.0 − 0.0005L)
For rope lengths 4,000 feet or greater: Minimum Value = Static Load × 5.0.

(c) Tail ropes (balance ropes).

Minimum Value = Weight of Rope × 7.0

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United States Code

Title 30 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 30 CFR Part 57 after this date.

  • 2015-09-02; vol. 80 # 170 - Wednesday, September 2, 2015
    1. 80 FR 52984 - MSHA Headquarters, Pittsburgh Safety and Health Technology Center, and Respirable Dust Processing Laboratory Address Changes
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Mine Safety and Health Administration
      Final rule; technical amendment.
      Effective Date: September 2, 2015.
      30 CFR Parts 7, 18, 44, 46, 48, 49, 56, 57, 70, 71, 72, 74, 75, and 90