ASME A17.6-2017 pdf – Standard for Elevator Suspension, Compensation, and Governor Systems. When replacing suspension, compensating, and car or drum counterweight ropes, all ropes in a set shall be replaced, except as permitted by 1.10.5. The ropes in the set shall be new, all from the same manufacturer and of the same material, grade, construction, and diameter. Data tags conforming to ASME A17.1/CSA B44, requirement shall be applied. Suspension, car, and drum counterweight rope fastenings shall conform to ASME A17.1/CSA 1344, requirement 2.20.9.
1.10.5 RepLacement of a Single Suspension Rope
If one rope of a set is worn or damaged and requires replacement, the entire set of ropes shall be replaced; except, where one rope has been damaged during installation or acceptance testing prior to being subjected to elevator service, it shall be permissible to replace a single damaged rope with a new rope, provided that the requirements of and of through are met.
NOTE: Damage includes but is not limited to kinked ropes. The steel wire rope data for the replacement rope must correspond to the steel wire rope data specified in ASME A17.1/CSA B44, requirement The replacement rope shall be provided with a data tag conforming to ASME A17.1/CSA B44, requirement
1. 10.5.3 The suspension ropes, including the damaged rope, shall not have been shortened since their original installation. The diameter of any of the remaining ropes shall not be less than the nominal diameter minus 0.4 mm (0.015 in.).
1. 10.5.5 The tension of the new replacement rope shall be checked and adjusted as necessary at semimonthly intervals over a period of not less than 2 months after installation. If proper equalization of the rope tension cannot be maintained after 6 months, the entire set of suspension ropes shall be replaced. The replacement rope shall be provided with the same type of suspension rope fastening used with the other ropes.
(c) Lay Length. The distance measured parallel to the longitudinal rope axis, in which the outer strands of a stranded rope make one complete turn about the axis of the rope. Noncircutar Cross-Section Designs (Type II)
(a) The nominal size of the noncircular designs are described by the maximum measured outside width and depth dimensions. The thickness dimension is the dimension for the axis of bending.
(b) The functional thickness of the maximum dimension of the load-carrying strands in the axis of bending. For noncircular section designs, functional thickness is treated as functional diameter for determining minimum sheave diameters.
2.3.4 MechanicaL Properties Aramid Fiber Aramid Yarn TensiLe Strength. The ratio between the maximum force obtained in a tensile test and the nominal cross-sectional area of the test yarn. Requirements for aramid tensile strength is determined by the yarn tensile strength grade as specified by ASTM D885/D885M or ASTM D7269, and requirements for ararnid strand tensile strength grade as specified by
ASTM D2343. Aramid Yarn/Strand TensiLe ModuLus. The ratio between the stress and unit strain of the test yarn/ strand. Rope Minimum Breaking Force (MBF). The specified value that the actual (measured) breaking force must meet or exceed in a prescribed tensile test. ActuaL (Measured) Breaking Force. The breaking force obtained using the prescribed tensile test method per CI 1500. CaLcuLated Breaking Force. The value of breaking force obtained from the sum of the measured breaking forces of all of the yarns in the rope, before rope making. Rated Breaking Force. A value of breaking force, less than or equal to minimum breaking force, published by the manufacturer to which ASME A17.1/ CSA B44 rope factors of safety are applied. ResiduaL Strength. The actual breaking strength of a suspension member at any time during its operational life cycle.
NOTE: The residual strength will be reduced as the suspension member is used and is subjected to wear.