Section 2.20 Suspension Means and Their Connections
Elevator cars and counterweights shall be suspended by steel wire ropes, aramid fiber ropes, or noncircular elastomeric-coated steel suspension members attached to the car frame or passing around sheaves attached to the car frame specified in 2.15.1. Suspension means that have previously been installed and used on another installation shall not be reused. All suspension members in a set of suspension means shall be the same material, grade, construction, and dimensions. A suitable means shall be provided to protect the suspension means during the installation process.
Only the following shall be permitted:
(a) steel wire ropes constructed in accordance with ASME A17.6, Part 1
(b) aramid fiber ropes constructed in accordance with ASME A17.6, Part 2
(c) noncircular elastomeric-coated steel suspension members constructed in accordance with ASME A17.6, Part 3
(a) type of suspension means
(b) the number of suspension members
(c) either the diameter or the width and thickness in millimeters or inches, as applicable
(c) A combination of (a) and (b), provided that all required information is furnished.
(d) If (a) or (c) applies, the material and marking of the tag shall comply with 8.13.3, except that the height of the letters and figures shall be not less than 1.5 mm (0.06 in.].
(a) type of suspension (steel wire rope, aramid fiber rope, or noncircular elastomeric-coated steel suspension member]
(b) either the diameter or the width and thickness in millimeters or inches, as applicable
(c) the suspension means manufacturer's minimum breaking force in kilonewtons or pounds-force, as applicable
(e) the grade of material used or the suspension means manufacturer's designation, as applicable
(f) construction classification, where applicable
(g) for steel wire rope, nonpreformed, if applicable
(h) for steel wire rope, finish coating, if applicable
(i) for steel wire rope, compacted strands, if applicable
(j) name or trademark of the suspension means manufacturer
(k) name of person or organization who installed the suspension means
(l) the month and year the suspension means were installed
(m) the month and year the suspension means were first shortened
(n) lubrication information, if applicable
The factor of safety of the suspension means shall be not less than shown in Table 2.20.3. Figure 8.2.7 gives the minimum factor of safety for intermediate speeds. The factor of safety shall be based on the actual speed of the suspension means corresponding to the rated speed of the car.
Where suspension means are different from traditional steel wire ropes, technical criteria for essential safety requirements and parameters, such as minimum factor of safety, monitoring, residual strength, and replacement, shall be selected on the basis of sound engineering practice compatible with the product technology, including performance testing under elevator operating conditions for its range of application.
The minimum factor of safety for any suspension means shall be not less than the values shown in Table 2.20.3 except that the factor of safety of steel wire suspension ropes with diameters equal to or greater than 8 mm (0.315 in.) but less than 9.5 mm (0.375 in.) shall be not less than 12 or they shall meet the requirements of 184.108.40.206. See also Nonmandatory Appendix U.
The factor of safety shall be calculated by the following formula:
|N||=||number of runs of suspension members under load. For 2:1 arrangements, N shall be 2 times the number of suspension members used, etc.|
|S||=||manufacturer's rated breaking force of one suspension member, kN (lbf)|
|W||=||maximum static load imposed on all suspension members with the car and its rated load at any position in the hoistway, kN (lbf)|
|Suspension Member Speed,
|Minimum Factor of Safety|
Where a car counterweight is used, the number of counterweight ropes used shall be not less than two.
The term "diameter," where used in reference to ropes, shall refer to the nominal diameter as given by the rope manufacturer.
The minimum diameter of hoisting and counterweight ropes shall be 4.0 mm (0.156 in.). Outer wires of steel wire ropes shall be not less than 0.21 mm (0.008 in.) in diameter.
Suspension steel wire ropes of winding-drum machines shall have the drum ends of the ropes secured on the inside of the drum by clamps.
Where the ropes extend beyond their clamps or sockets, means shall be provided to prevent the rope ends from coming out of the inside of the drum and to prevent interference with other parts of the machine.
(a) be based on the type of suspension members and the application.
(b) detect relative motion [see 2.20.11, 220.127.116.11.2(cc)(3), and 18.104.22.168.12] between the drive sheave and suspension members before any suspension member parts, and function in accordance with (c) in not greater than the smaller of the following:
(1) 45 s
(2) the time for traveling the full travel, plus 10 s, with a minimum of 20 s if the full travel is less than 10 s
NOTE [22.214.171.124(b)]: This relative motion between suspension members and drive sheave is independent of normal creep (see Section 1.3) of the suspension members. Compliance with the detection requirement can be accomplished by any method that will determine the relative position of the suspension means with respect to the rotational position of the drive sheave. This can be accomplished by timers or position- and velocity-measuring devices, as an example.
(c) when actuated, cause the removal of electrical power from the driving-machine motor and brake. The means shall comply with the requirements of 126.96.36.199, 2.26.7, 188.8.131.52, 184.108.40.206.3, and 220.127.116.11.3. No single ground shall render the traction-loss detection means ineffective.
(d) once actuated by traction loss, comply with the following:
(1) The traction-loss detection means shall remain actuated until it is manually reset.
(4) The removal or restoration of mainline power shall not reset the traction-loss detection means.
(a) operate at or before the separation of a suspension member
(b) when actuated, automatically function to stop the car in a controlled manner at or before the next landing for which a demand was registered, and the elevator shall not be permitted to restart except on hoistway access or inspection operation
(c) be arranged to be tested in accordance with the requirements in 18.104.22.168.2(ss)(l), and instructions for testing shall be included in the on-site documentation [see 22.214.171.124.2(b)(5)] with sufficient detail to ensure that testing can be accomplished by elevator personnel
(d) remain actuated until it is manually reset
NOTE [126.96.36.199(d)]: This does not require the means itself to remain actuated, only that the elevator shall not be permitted to restart except on hoistway access or inspection operation until a manual reset is performed.
(a) operate before any suspension member is reduced in strength to 60% of its rated breaking force
(c) be arranged to be tested in accordance with the requirements in 188.8.131.52.2(ss)(2), and instructions for testing shall be included in the on-site documentation [see 184.108.40.206.2(b)(5)] with sufficient detail to ensure that testing can be accomplished by elevator personnel
(d) remain actuated until it is manually reset
NOTE [220.127.116.11(d)]: This does not require the means itself to remain actuated, only that the elevator shall not be permitted to restart except on hoistway access or inspection operation until a manual reset is performed.