1、Designation: F 2436 05Standard Test Method forMeasuring the Performance of Synthetic Rope Rescue BelaySystems Using a Drop Test1This standard is issued under the fixed designation F 2436; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers drop test procedures to measurerope rescue belay system performance. It appl
3、ies only to belaysystems consisting of an untensioned rope connecting the loadto an anchored belay device. This test method does not addressother types of belays, such as self-belays or belays for leadclimbing, nor does it test the rescuers belaying ability.1.2 This test method may be used to help m
4、easure a rescuebelay systems performance under controlled drop test condi-tions, but it will not necessarily provide guidance as to whichbelay method is most suited to a particular application. Otherconsiderations, such as ease of handling, performance ondifferent types and diameters of rope, portab
5、ility, versatility,system safety factor, cost, and automatic operation that do notrequire the positive action of the belayer may influence theselection of a belay system and are not dealt with in this testmethod. See X1.1.1.3 The values stated in SI units are to be regarded asstandard.1.4 This stand
6、ard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns associated with its use. It isthe responsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the appli
7、cability of regulatory limitations prior to use.Additional precautions for this test method are given in 8.1 and8.2.2. Referenced Documents2.1 ASTM Standards:2D 1776 Practice for Conditioning and Testing TextilesF 2266 Specification for Masses Used in Testing RescueSystems and Components2.2 Other Do
8、cument:CI 1801-98 Low Stretch and Static Kernmantle Life SafetyRope33. Terminology3.1 Definitions:3.1.1 belay, na secondary system, or the system compo-nents, used to arrest the load in the event of a failure in thesystem.3.1.2 belay, vin rope rescue systems, to operate an unten-sioned secondary rop
9、e (belay line) so that it may be taken in orlet out as the load is raised or lowered, and then hold the loadin case of failure of the lifting line (working line) system.3.1.3 belay assembly, nall elements of the belay system,but not including the belay line and the belay anchor.3.1.4 belay assembly
10、extension, L, (cm), nthe increase inlength of the belay assembly, due to stretch or other extension,measured from the anchorage to the farthest gripping point ofthe belay assembly while statically tensioned, post-drop, ex-pressed in centimetres (cm).3.1.5 belay device, nthat element of the belay sys
11、temproviding a moveable connection point to the belay line, whichcan secure the belay line when necessary.3.1.6 belay line, nin rope rescue systems, a secondaryline, generally untensioned, acting as a back-up to the liftingline as distinguished from the lifting line (working line) thatactually raise
12、s, lowers, or transports the load.3.1.7 belay system, nthe belay assembly and the belayline, but for the purposes of this test method, not including thebelay anchor.3.1.8 belay system extension, L, (cm), nthe distancebelow the zero line (this excludes drop height) reached at themaximum extension dur
13、ing fall arrest, prior to rebound; alsoknown as stopping distance, expressed in centimetres (cm).3.1.9 belay system failure, nwhen the test block hits theground.3.1.10 drop height, L, (cm), nthe free-fall distance theblock falls before the belay system begins to arrest its fall.1This test method is
14、under the jurisdiction of ASTM Committee F32 on Searchand Rescue and is the direct responsibility of Subcommittee F32.01 on Equipment,Testing, and Maintenance.Current edition approved July 1, 2005. Published July 2005.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
15、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Cordage Institute, 994 Old Eagle School Rd., Wayne, PA19087,http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
16、 C700, West Conshohocken, PA 19428-2959, United States.3.1.11 elongation classification, nin rope rescue systems,elongation of new rope as measured by CI 1801-98 at 10 % ofthe manufacturers rated breaking strength: static 6 % and 10 % elongation3.1.12 extension, L, nthe change in length of a materia
17、l,device, or system due to a change in an applied force, usuallymeasured at some specified force, force rate, or duration offorce, or combination thereof.3.1.13 final rope length, L, (cm), nthe distance betweenthe inside of the bowline where it contacts the shackle of thetest block and the lowest gr
18、ipping portion of the belayassembly after the test block has rebounded and come to rest.3.1.14 lifting line, nthe line that lifts the test block andfrom which a quick disconnection is made to drop the testblock (working line).3.1.15 maximum arrest force, MAF, (N), nthe peak forcemeasured during the
19、fall arrest.3.1.16 pre-grip slippage, L, (cm), nrope movementthrough the belay device before gripping stops movement.3.1.17 rope rescue system, na system using fiber ropes toraise, lower, or transport a load.3.1.18 zero line, nthe level of the contact between theinside of the bowline and test block
20、shackle when it is 3 mbelow the lowest gripping portion of the belay assembly, priorto the drop.4. Summary of Test Method4.1 A rigid test block of the correct mass simulates a rescueload. A rope of given length connects the test block to a belayassembly that is in turn connected to a suitably rigid
21、overheadanchor point. The test block is raised a given distance with aseparate lifting system and is then released. After the block hasfree-fallen to its starting point, the belay system (the rope andbelay assembly) begins to arrest its fall. Among other things,maximum arrest force and belay system
22、extension are mea-sured. The belay system may or may not be successful instopping the falling test block.5. Significance and Use5.1 The types of rope rescue systems to which this testmethod apply use a tensioned mainline and untensioned belayline. If a fall occurs because of a mainline system failur
23、e ormisuse, considerable energy must be absorbed by the belay fora successful arrest. This drop test method simulates a “worstcase” condition when systems are operated as designed, and isdesigned to help evaluate and compare the performance ofvarious rope rescue belay systems under such conditions.
24、(SeeNote 1.) The successful catching of a load does not imply thatthe tested system is suitable for any and all belaying. See X1.2.NOTE 1Higher forces may be encountered under some circumstances,such as the belay being operated with excessive slack.6. Interferences6.1 The method used to release the
25、test block could affectthe results by imparting motion to the block, in addition to thestraight fall caused by gravity.6.1.1 Residual magnetism of an electromagnetic releaseshall be guarded against.6.1.2 The use of a light cord between the test block and thehoist line, which is cut by a heated nichr
26、ome wire or stickmounted knife, is also satisfactory.6.1.3 Any release buckle, latch, or device that might imparta sideways force to the suspended mass shall not be used.6.1.4 Any restriction imposed on the test block, such as theuse of guide rails to contain and control the blocks fall, or theuse o
27、f a linear motion transducer, shall be constructed andmaintained so that the combined effect shall not reduce thevelocity of the mass more than 2 % from the velocity of a freefalling block of similar mass. Velocity measurements shall bemade and recorded at the beginning of each test day whenguide ra
28、il type test rigs are to be used.6.2 If the lifting lines system uses a twisted cable, theremay be difficulties with the test block turning and twisting therope. This can be prevented by light “anti-twister” cordsrunning off to the side of the block that are released at the sametime as the lifting l
29、ine connection.6.3 Inconsistency in the tightening of knots shall beavoided.7. Apparatus7.1 The test facility shall be a structure with less than 1 mmof immediate elastic deformation at a force of 50 kN at theanchor point and having a natural frequency above 200 Hz.7.1.1 Failing this, a distinct cau
30、tionary note should be madein all reports generated at the test facility regarding the anchorrigidity or natural frequency.7.2 The test block shall have an appropriate mass and, ifmade from a collection of plates, bars, or ingots, shall be joinedin a fashion that prevents play or relative movement o
31、f partsduring the testing. It shall be provided with a shackle for theattachment of the belay line and the lifting line (through thequick-disconnect fitting) from which it hangs in symmetry. Theshackle shall have less than 1 mm of immediate elasticdeformation at a force of 50 kN.7.2.1 The mass of th
32、e rigid test block shall be Type II (100kg), Type IV (200 kg), or Type V (280 kg) 6 1 %, includingattachment hardware, for the testing of equipment intended foruse with various rescue systems, in accordance with Specifi-cation F 2266. The user should select the most appropriatemass to the intended a
33、pplication. Adequate attachment point,rigidity, and symmetry shall be maintained. The mass usedshall be included in the report.7.3 The belay line shall be tied directly to the test blockusing a bowline knot. Use of a setup where the rope is tied toa platen (catch plate) upon which the falling test b
34、lock impactsshall not be permitted.7.4 The test block lifting system shall be able to position thetest block to a tolerance of 60.5 cm and when stopped, sustainthe test block for a 5 min period at a given height with the sametolerance.7.4.1 The lifting line shall pass not more than 10 cmhorizontally
35、 in distance from the anchor point for the belayassembly.7.5 If a pit of loose material such as sand is used, careshould be taken so that the test block does not increase its massby picking up material from the pit after impact.F24360527.6 For belay assemblies that require an active grippinghand for
36、 operation, an artificial hand shall be substituted toprevent staff injuries.7.6.1 The artificial hand shall be constructed as pictured inFig. 1.7.6.2 The artificial hand shall be spring pressure plates thatprovide a constant belay rope tension. The user shall select theappropriate tension. See X1.3
37、. The tension used shall beincluded in the report.7.6.3 When an artificial hand is used, it is considered to bean integral part of the belay assembly.7.6.4 Hanging a mass on the belay rope in place of anartificial hand is not permitted.7.6.5 The point where the rope leaves the artificial hand(when r
38、equired) shall be within 40 cm of the point where therope enters the belay assembly. There shall be no slack in therope between the artificial hand and the belay assembly.7.6.6 Various anchor points for the artificial hand, each withan immediate elastic deformation of less than 1 mm under theapplica
39、tion of a 500 N force, shall be provided so that theposition relative to the belay assembly can duplicate theposition of function in actual use.7.7 The test facility shall have a rope flaking area, whereadditional rope can be loosely flaked out. The test block shallbe able to reach the ground withou
40、t using up this additionalrope.7.7.1 The flaking area shall be a flat horizontal surface onthe testing facility with no roughness or irregularities to impedethe free flow of the rope.FIG. 1 Artificial HandF24360537.7.2 The rope (belay line) shall be flaked at an angle lessthan 15 of directly in line
41、 with the devices intended mannerof use for braking, and the flaking area shall be positioned toprovide1m(610 cm) of unsupported rope between the flakingarea and the belay device being tested.7.8 The maximum arrest force (MAF) shall be measured bya system, which is accurate to 61 % of the MAF, free
42、fromartifact, and whose calibration is traceable to a recognizedsource. It is preferable that the recording device also be able togenerate a force/time curve.7.8.1 MAF measurements are obtained by sampling of anelectronic load cell or other suitable device. Its physicalcharacteristics and all associ
43、ated electronics shall allow sam-pling at a minimum of 2000 times per second. The minimumresonant frequency of the load cell shall be 4 kHz.7.9 To determine the belay extension, the lowest pointduring the drop shall be read by using a suitable device capableof measuring to an accuracy of 61 cm. Care
44、 shall be exercisedthat extension measuring system causes no significant cush-ioning or retarding effect on the test block. The total velocitydifference from a free falling mass and a mass with or withoutguide rails and an extension measuring system shall be lessthan 2 %. The system used shall be cl
45、early described andillustrated in the report.8. Safety Hazards8.1 PrecautionsThis test method involves a falling mass,moving rope, numerous possible pinch points, and the potentialfor flying debris if a component fails during a drop test. Avoidcontact with any of the test materials or the apparatus
46、duringoperation and provide shielding for workers. Place hazardwarning signs in a conspicuous place. The development ofsafety procedures, both general and specific to the particulartest facility, is strongly recommended.8.2 Precautions should also be taken to protect any instru-mentation, such as fo
47、rce transducers, electrical leads, distancemeasurement devices, and so forth, from possible damage fromrope snapback or flying debris in the event of a failedcomponent during a drop test.9. Sampling9.1 If the belay assembly is intended for use on variousdiameters of ropes, tests shall be done on bot
48、h the largest andsmallest and, if the range exceeds 2 mm, on representativediameters in between. If the belay assembly is intended for usewith various brands and designs of ropes, each rope brand andconstruction should be tested. (See Note 2.)NOTE 2Different rope brands of same diameter can have une
49、xpecteddifferences in performance, apparently, due to fairly small differences inrope construction. It should be clearly stated which rope brands, sizes andconstructions were tested and the condition they were in at the start oftesting.10. Conditioning10.1 While different conditions of temperature and humiditymay affect impact forces and other test results, conditioning ofropes is not feasible for most testing. If conditioning is feasible,standard conditions of Practice D 1776 shall be used and berecorded in test results.10.2 If conditioni
