Mich. Admin. Code R. 408.834 - Wire rope

Rule 34.

(1) The owner/operator or person designated by the owner/operator shall thoroughly examine wire rope. Wire rope found to be damaged shall be condemned and replaced with new rope of proper design and capacity. Any of the following conditions shall be cause for rope replacement:

(a) In running ropes, 6 randomly distributed broken wires in 1 rope lay, or 3 broken wires in 1 strand in 1 rope lay. A rope lay is the length along the rope in which 1 strand makes a complete revolution around the rope.

(b) In pendants or standing ropes (ropes bearing the entire load and subjected to constant pressure and surge shocks), evidence of more than 1 broken wire in 1 rope lay.

(c) Abrasion, scrubbing, or peening causing loss of more than 1/3 of the original diameter of the outside wires.

(d) Severe corrosion.

(e) Severe kinking, severe crushing, or other damage resulting in distortion of the rope structure.

(f) Heat damage resulting from a torch or arc caused by contact with electrical wires.

(g) Reduction from normal diameter of more than 3/64 inch for diameters up to and including 3/4 inch; 1/16 inch for diameters 7/8 inch to 1-1/8 inches; 3/32 inch for diameters 1-1/4 inches to 1-1/2 inches. Marked reduction in diameter indicates deterioration of the core resulting in lack of proper support for the load-carrying strands. Excessive rope stretch or elongation may be an indication of internal deterioration.

(h) Bird-caging or other distortion resulting in some members of the rope structure carrying more load than others.

(i) Noticeable rusting or development of broken wires in the vicinity of attachments. If this condition is localized in an operating rope, the section in question can be eliminated by making a new attachment. This may be done rather than replacing the entire rope.

(2) Wire ropes used to support, suspend, bear, or control forces and weights involved in the movement and utilization of tubs, cars, chairs, seats, gondolas, other carriers, the sweeps or other supporting members of a ride or device shall not be lengthened or repaired by splicing.

(3) Couplings, sockets, and fittings shall be of a design and type approved by the board and installed in accordance with the instructions or specifications of the designer, engineer, or manufacturer.

Notes

Mich. Admin. Code R. 408.834

1979 AC; 2003 AACS