ASME A17.6-2017 pdf free download.Standard for Elevator Suspension, Compensation, and Governor Systems
(a) Wire Level. A level of requirement for tensile strength in pounds per square inch (e.g., Level 3, see ASTM A1007).
(b) Tensile Strength Grade. A level of requirement for tensilestrength.Itisdesignatedbyavalueaccordingtothe lowerlimitoftensile strength and is used when specifying wire.
1.3.4.1.2 Torsions. A measure of wire ductility normallyexpressed as the numberof360-degrevolutions that a wire can withstand before breakage occurs, using the prescribed test method in ASTM A1007 or ISO 2232. Torsion requirements are based on the wire diameterand wire level ortensile strength grade, as found in the appro- priate wire standard.
1.3.4.2 Rope
1.3.4.2.1 Minimum Breaking Force (MBF). A speci- fied value that the actual (measured) breaking force must meet or exceed in a prescribed tensile test.
1.3.4.2.2 Actual (Measured) Breaking Force. The breaking force obtained using the prescribed tensile test method in ASTM A931 or ISO 3108.
1.3.4.2.3 Calculated Breaking Force. The value of breaking force obtained from the sum of the measured breaking forces of the load-bearing wires in the rope, before rope making, multiplied by the measured spinning efficiency.
1.3.4.2.4 Measured Spinning Efficiency. The ratio between the measured breaking force of the rope and the sum of the measured breaking forces of the wires, before rope making.
1.3.4.2.5 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.
1.3.4.3 Rope Stretch (Extension)
1.3.4.3.1 Constructional Stretch (Extension). The amount of extension that is attributed to the initial bedding down of wires within the strands and the strands within the rope due to loading. Initial extension cannot be determined by calculation.
1.3.4.3.2 Elastic Stretch (Extension). The amount of recoverable extension that follows Hooke’s Law within certain limits due to application of a load.
1.3.4.3.3 Permanent Stretch (Extension). Nonelastic extension. 1.3.5 Rope Manufacture
1.3.5.1 Preformation
1.3.5.1.1 Preformed Rope. Rope in which the wires and strands in the rope will not, after removal of any seizing (serving), spring out of the rope formation. 1.3.5.1.2 Nonpreformed Rope. Rope in which the wires and strands in the rope will, after removal of any seizing (serving), spring out of the rope formation. 1.3.5.2 Prestretching.Thenamegiventoaprocessthat results in the removal of a limited amount of construc- tional stretch.
1.3.5.3 Production Length. The length of rope manu- factured in one continuous operation from one loading of theclosingmachinecomprisingstrands, eachofwhichhas been produced in one continuous operation on the stranding machine. A production length may comprise one or more reels of rope.
1.3.6 Values
1.3.6.1 Nominal Value. The conventional value by which a physical characteristic is designated.
1.3.6.2 Actual (Measured) Value. Value derived from direct measurement in a prescribed manner.
1.3.6.3 Minimum Value. Specified value that an actual value must meet or exceed.
1.3.6.4 Maximum Value. Specified value thatan actual value must not exceed.
1.3.7 Rope Degradation
1.3.7.1 Normal Wear. Ropes showing wear equally on all strands around the circumference of the rope.
1.3.7.2 Unfavorable Wear. Ropes showing uneven wear and/or rouging due to poor installation, worn sheaves, unequally tensioned ropes, or severe environ- mental conditions.
1.3.7.3 Crown Wire Breaks. Fatigue failure ofthe outer wire following a diameter reduction due to wear.
1.3.7.3.1 Equally Distributed Breaks. Randomly distributed wire breaks throughout the lay of the rope without any pattern.
1.3.7.3.2 UnequallyDistributed Breaks. Wire breaks predominating in one or two strands within the lay ofthe rope.
1.3.7.3.3 Side-by-Side Breaks. Four wire breaks in one strand within the lay of a rope that resembles a staircase.
1.3.7.4 ValleyBreaks. Wire breaks thatare visible and occur outside ofthe crown wear area with the crown wire intact.
1.4.1 Rope Wire The wires used in rope making shall comply with the appropriate parts ofthis Standard, ASTM A1007 for rope wire, ISO 2232, or equivalent. For those wires covered by the tables, the manufacturer, subjectto the limits in Table 1.4.1-1, shall decide the tensile grade so thatthe minimum breaking force of the rope is achieved.ASME A17.6 pdf download.ASME A17.6-2017 pdf free download
