Mich. Admin. Code R. 408.15732 - Guylines and hoisting lines

Rule 5732.

(1) A guyline shall be maintained in good condition and shall be of a strength, including auxiliary devices such as chains, boomers, and clamps, capable of withstanding loads for the anticipated service conditions. A guyline shall have a safety factor of 3.

(2) Each guyline shall be visually inspected before each rig up. A guyline shall be removed from service and replaced if in any length of 10 diameters the total number of visible broken wires exceeds 10% of the total number of wires in the line or if the guyline shows other signs of excessive wear, corrosion, or defect.

(3) Wire rope used for hoisting purposes shall be of a strength to safely lift and otherwise handle anticipated loads under conditions of service. The maximum allowable hoisting line working load shall be based on a minimum safety factor of 3 for normal operations. A minimum safety factor of 2 is allowed when setting casing, pulling on stuck pipe, or while engaging in similar infrequent operations.

(4) A damaged portion of a hoisting line shall be removed from service when any of the following conditions exist:

(a) Three broken wires are found in 1 lay of 6 by 6 wire rope.

(b) Six broken wires are found in 1 lay of 6 by 19 wire rope.

(c) Eight broken wires are found in 1 lay of 8 by 19 wire rope.

(d) Nine broken wires are found in 1 lay of 6 by 37 wire rope.

(e) Wire ropes not covered in this subrule are found to have 4% or more of the total number of wires composing such rope broken in 1 lay.

(f) Marked corrosion appears.

(g) Corroded or broken wires are noted at end connections.

(h) End connections are corroded, cracked, bent, worn, or improperly applied.

(i) Evidence is noted of kinking, crushing, cutting, or unstranding.

(5) When the hoisting line is placed on the hoisting drum, the end shall be securely fastened and there shall be not less than 7 line wraps remaining on the drum at the lowest operating position of the traveling block.

(6) A deadline anchor for a hoisting line shall be so constructed, installed, and maintained that its strength equals or exceeds the working strength of the hoisting line.

(7) When a ton-mile calculation indicates, or an inspection reveals, that the hoisting line safety factor has been materially reduced, the line shall be slipped, cut, or replaced.

(8) A hoisting line under load shall not be allowed to come in contact with any part of the derrick or mast, stationary equipment, or material in the structure, except at the crown block sheaves, traveling block sheaves, a turnback roller, and a line stabilizer, when needed.

(9) The hoisting line shall not be removed from the hoisting drum until the traveling block is rested on the rig floor or held suspended by a separate wire rope or chain.

Notes

Mich. Admin. Code R. 408.15732

1979 AC; 1989 AACS