ASME A17.6:2017 pdf download

ASME A17.6:2017 pdf download Standard for Elevator Suspension, Compensation, and Governor Systems
(a)Wire Level. A level of requirement for tensilestrength in pounds per square inch (e.g.. Level 3, seeASTM A1007).
(b)Tensile Strength Grade. A level of requirement fortensile strength. lt is designated by a value according to thelower limit of tensile strength and is used when specifyingwire.
1.3.4.1.2 Torsions. A measure of wire ductilitynormally expressed as the number of 360-deg revolutionsthat a wire can withstand before breakage occurs, usingthe prescribed test method in ASTM A1007 or ISo 2232.Torsion requirements are based on the wire diameter andwire level or tensile 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 forcemust meet or exceed in a prescribed tensile test.
1.3.4.2.2 Actual (Measured) Breaking Force. Thebreaking force obtained using the prescribed tensiletest method in ASTM A931 or Iso 3108.
1.3.4.2.3 Calculated Breaking Force.The value ofbreaking force obtained from the sum of the measuredbreaking forces of the load-bearing wires in the rope,before rope making, multiplied by the measured spinningefficiency.
1.3.4.2.4 Measured Spinning Efficiency.The ratiobetween the measured breaking force of the rope andthe sum of the measured breaking forces of the wires,before rope making.
1.3.4.2.5 Residual Strength. The actual breakingstrength of a suspension member at any time duringits operational life cycle.
NOTE: The residual strength will be reduced as the suspensionmember is used and is subjected to wear.
1.3.4.3 Rope Stretch (Extension)
1.3.4.3.1 Constructional Stretch (Extension). Theamount of extension that is attributed to the initialbedding down of wires within the strands and the
strands within the rope due to loading. Initial extensioncannot be determined by calculation.
1.3.4.3.2 Elastic Stretch (Extension).The amount ofrecoverable extension that follows Hooke’s Law withincertain limits due to application of a load.
1.3.4.3.3 Permanent Stretch (Extension). Nonelasticextension.
1.3.5 Rope Manufacture1.3.5.1 Preformation
1.3.5.1.1 Preformed Rope. Rope in which the wiresand strands in the rope will not, after removal of anyseizing (serving). spring out of the rope formation.
1.3.5.1.2 Nonpreformed Rope. Rope in which thewires and strands in the rope will, after removal ofany seizing (serving). spring out of the rope formation.1.3.5.2 Prestretching.The name given to a process thatresults 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 ofthe closing machine comprising strands,each of which hasbeen produced in one continuous operation on thestranding machine. A production length may compriseone or more reels of rope.
1.3.6 Values
1.3.6.1 Nominal Value. The conventional value bywhich a physical characteristic is designated.
1.3.6.2 Actual (Measured) Value. value derived fromdirect measurement in a prescribed manner.
1.3.6.3 Minimum Value. Specified value that an actualvalue must meet or exceed.
1.3.6.4 Maximum value. Specified value that an actualvalue must not exceed.
1.3.7 Rope Degradation
1.3.7.1 Normal wear. Ropes showing wear equally onall strands around the circumference of the rope.
1.3.7.2 Unfavorable Wear. Ropes showing unevenwear and/or rouging due to poor installation, wornsheaves, unequally tensioned ropes, or severe environ-mental conditions.
1.3.7.3 crown Wire Breaks.Fatigue failure of the outerwire following a diameter reduction due to wear.
1.3.7.3.1 Equally Distributed Breaks. Randomlydistributed wire breaks throughout the lay of the ropewithout any pattern.
1.3.7.3.2 Unequally Distributed Breaks. Wire breakspredominating in one or two strands within the lay of therope.
1.3.7.3.3 Side-by-Side Breaks. Four wire breaks inone strand within the lay of a rope that resembles astaircase.
1.3.7.4 Valley Breaks. Wire breaks that are visible andoccur outside of the crown wear area with the crown wireintact.
SECTION 1.4MATERIAL
1.4.1 Rope Wire
The wires used in rope making shall comply with theappropriate parts of this Standard,ASTM A1007 for ropewire, ISo 2232, or equivalent. For those wires covered bythe tables, the manufacturer, subject to the limits in Table1.4.1-1,shall decide the tensile grade so that the minimumbreaking force of the rope is achieved.
1.4.1.1 Outer wires shall be made to the tensile rangesspecified in Table 1.4.1.1-1 and torsion requirementsspecified in Table 1.4.1.1-2.
1.4.1.2 Wire tensile limitations in Table 1.4.1-1 do notapply to center, filler, and core wires.
1.4.1.3 Wire tensile limitations do not apply tocompacted strand ropes.
1.4.1.4 The manufacturer shall have the option toadopt a single wire level or tensile strength gradethroughout the rope or to decide on a combination ofwire levels or tensile strength grades.
1.4.1.5 Wire diameters shall be selected by the manu-facturer in accordance with design requirements.