1、I Metric I A-A-50435B 24 March 1992 SUPERSEDING A-A-50435A 3 September 1991 COMMERCIAL ITEM DESCRIPTION ROPES (ARAMID) The General Services Administration has authorized the use of this commercial item description. ABSTRACT. This commercial item description covers four strand Aramid Fiber Rope which
2、 is intended for use as mooring lines and floating dry dock tending lines. SALIENT CHARACTERISTICS. 1 DESCRIPTION The Aramid Fiber Rope shall be fabricated from four strands right regular laid with a three strand right regular laid polypropylene core. rope shall consist of 36 parallel aramid yarns l
3、eft laid helically around the strand core (1x36) with a braided jacket of alternating aramid and polyester yarns. The center core shall consist of three strand polypropylene with a braided jacket of alternating aramid and polyester yarns. of the finished rope shall be natural. Each strand of the The
4、 color 1.1 BRAIDED JACKET. The type of braid, number of strands, yarns per strand and multipliers shall be in accordance with tables I and II. The jacket shall fit firmly around each aramid strand and polypropylene core when inspected with the rope in a relaxed state. Beneficial comments, recommenda
5、tions, additions, deletions, clarifications, etc. and any other data which may improve this document should be sent by letter to: Naval Sea Systems Command, ATTN: 55233, Washington, D.C. Commander, 20362-5101. AMSC N/A FSC 4020 DISTRIBUTION STATEMENT A Approved for public release; distribution is un
6、limited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-mm 85 89 94 105 120 136 148 160 193 207 A-A-50435B 40 m 9999974 00b4b II m A-A-50435B Table I. Structural Requirements for Strand Jacket Rope Circumference Type Braid Number of Pick Count (Inch
7、es) 5 Strands Per MM + or - 10% Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain Plain 24 24 24 24 24 32 24 32 24 32 36 48 24 32 36 48 32 36 48 32 36 48 . 40 .40 .40 * 40 .40 -40 .40 .40 . 40 .40 .40 -40 .40 .40 .40 .40 .40
8、 .40 .40 .40 .40 .40 - Inches are approximate, added for information only Table II. Structural Requirement for Core Jacket Core Circumference Type Braid Number of Pick Count + or - 10% mm (1nches)l Strands Per MM 19 (3/4) Plain Plain 21 (13/16) Plain Plain Plain Plain 25 (1) 28 (1-3/32) Plain Plain
9、30 (1-3/16) Plain Plain 32 (1-1/4) Plain . Plain 41 (1-5/8) Plain Plain IL Inches are approximate, added for 2 16 24 16 24 16 24 16 24 16 24 16 24 24 32 information 1.00 1.00 0.93 0.93 0.75 0.75 0.69 0.69 0.63 0.63 0.60 0.60 0.46 0.46 only Provided by IHSNot for ResaleNo reproduction or networking p
10、ermitted without license from IHS-,-,-A-A-50435B Table II. Structural Requirement for Core Jacket (Continuation) Core Circumference Type Braid Number of Pick Count nun (1nches)l Strands Per MM 48 (1-7/8) Plain 24 Plain 32 57 (2-1/4) Plain 24 Plain 32 64 (2-1/2) Plain 24 Plain 32 0.40 0.40 0.33 0.33
11、0.30 0.30 Inches are approximate, added for information only. 1.2 Fiber finish. The rope manufacturer shall use aramid and polyester fibers with an overlay finish that will ensure, in the marine environment, that the rope will give improved performance, that is, better than that of a rope made of fi
12、bers without an overlay finish. Manufacturer shall maintain a record of verifiable information attesting to the fact that marine overlay finish has been applied to the fibers. The overlay finish provided shall not violate any other requirements of this specification. 2 PHYSICAL PROPERTIES. The finis
13、hed rope shall conform to the physical properties specified in Table III when tested in accordance with with in Fed Std 191. Table III. Physical Properties Circumference Linear Density Lay Length + or -5% + or -5% maximum mm (inches) kg/ 10 OM mm 85 (3-3/8) 89 (3-1/2) 105 (4-1/8) 136 (5-3/8) 148 (5-
14、7/8) 168 (6-1/4) 193 (7-5/8) 287 (8-3/16) 94 (3-3/4) 120 (4-3/4) 49 55 62 75 98 128 168 211 259 312 120 127 133 14 3 164 184 215 229 27Q 290 Breaking strength minimum kN 222 267 311 427 601 801 1000 1245 1557 1868 Inches are approximate and for inf ormation only. 2 Pounds are ineluded for informatio
15、n only. 3 (pounds 12 (50000) (60000) (70000) (960QO) (135000) (180008) (28000O) (350000) (420000) (225000) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-50435B 40 m 9999974 00b4b0 T I L A-A-50435B 2.1 EWNGATION. The total elongation of the rop
16、e shall not exceed six percent at the minimum breaking strength value of Table III. The load elongation curve, drawn autographically, shall not exhibit evidence of sudden changes in load applications greater than five percent of the load measured at the instant of change. splice slippage shall not b
17、e considered in this determination. Changes due to 2.2 FAILURE MECHANISM. The failure mechanism shall consist of sequential rupturing of the individual strands. 2.3 LAY LENGTH. The lay length shall not exceed the values in table III. 3 IDENTIFICATION MARKER. The manufacturer shall identify each prod
18、uct by inserting a water resistant marker inside one strand in all sizes of ropes. The manufacturers name, the year of manufacture, and type of fiber (aramid) shall be printed on the marker in bold, easy-to-read type. Italic or script type shall not be used. affected by exposure to salt water or min
19、eral oil. The printing shall not be 4 IDENTIFICATION TAG. In addition to the requirements specified in 3, each package unit shall have a ticket (identification tag) attached for identification purposes. The ticket shall be legibly printed, stamped, or typed with water insoluble ink. The ticket shall
20、 contain the following information: a. stock number b , nomenclature c. CID number d. length e. contract number and date f. date of manufacture and year g. contractors name 5 SPLICEABILITY. The finished rope shall be spliceable and shall not develop yarn displacement or strand cockles (distortion fo
21、rmed by back twist in the strand), 6 PUT UP. Unless otherwise specified, the rope shall be provided in standard lengths of between 183 meters (600 feet) and 201 meters (660 feet) when measured in the relaxed condition and shall be furnished without knots or splices on nonreturnable reels not larger
22、than 2 meters (7 feet) in diameter. Multiple lengths shall be permitted but no piece shall be less than 183 meters (600 feet). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50435B QUALITY ASSURANCE PROVISIONS. 1 gUALITY CONFORMANCE INSPECTION
23、. Unless otherwise specified, sampling for inspection shall be performed in accordance with Tables IV and V. Table IV. Sampling for Visual Examination and Testing of the End Iten Lot Size Sample Size -1 2 - 15 2 16 - 25 3 26 - 90 5 91 - 150 8 151 - 280 13 281 - 500 20 501 - 1200 32 1201 - 3200 50 32
24、01 - 10000 80 -I One additional sample specimen shall be selected for testing failure mechanism in 4.5. Table V. Examination for Length and Winding Lot Size Sample Size 1 - 10 11 - 500 501 - 3200 3201 - 10000 all 10 13 20 2 END ITEM VISUAL EXAMINATION. Each lot shall be examined for the following de
25、fects: Defects in design, construction, or workmanship; any cut, kink, broken or loose ends, bulged strands; not of continuous length, contains knots, splices or otherwise secured to make a continuous length; any spot or stain clearly noticeable; ends not secured, whipped or taped; identification ma
26、rker omitted or not as spec.ified. shall be reported as pass or fail. Results 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 t, A-A-50435B 40 9999974 00b4b2 3 A-A-50435B The unit for this examination shall be one reel. The length of 31 meters (1
27、00 feet) shall be subjected to the visual examination. The sample units shall be randomly selected and the sample size shall be as specified in Table IV. If any sample unit has one or more defects, the entire lot shall be rejected. 3 LENGTH AND WINDING. The end item shall be examined for the followi
28、ng defects: Length of unit more or less than specified (including permitted tolerances); Length of unit less than marked on ticket; Reels not in continuous length; Reels improperly or not firmly wound, resulting in slippage during winding; and Rope ends knotted or spliced to make a continuous length
29、. The sample unit for this examination shall be one reel. The sample size shall be as specified in Table V. is any defect in any sample, the lot shall be rejected. If there 4 TESTING OF END ITEM. The rope shall be tested as specified in 4.1 thru 4.7. The physical and chemical values apply to the ave
30、rage of the determinations made on the sample unit for test purposes as specified in the applicable test methods. The sample size shall be in accordance with Table IV and shall be zero percent defective. The lot size shall be expressed in units of reels. purposes shall be 22 meters (70 feet) of rope
31、. The sample unit for test 4.1 CIRCUMFERENCE AND PICKS PER MILLIMETER. The circumfernce shall be measured in accordance with method 6003 of Fed Std 191, and picks per millimeter shall be determined in accordance with method 6001 of Fed Std 191, Textile Test Methods. 4.2 LINEAR DENSITY. The linear de
32、nsity shall be determined in accordance with method 6004 of Fed Std 191. 4.3 BREAKING STRENGTH. Breaking strength determination shall be in accordance with method 6015 of Fed Std 191 except each sample specimen shall have a breaking strength not less than that specified in Table III. Eye splices on
33、aramid parallel fiber four strand cordage shall be accomplished by tucking with the lay for a minimum of six full tucks. Tapered splices are permitted. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50435B 40 m 9999974 0064683 5 m 1 A-A-50435B
34、 4.4 ELONGATION. The elongation shall be determined in accordance with method 6015 of Fed Std 191 except the length shall be measured when the load applied during the test is 30 percent and 50 percent of the minimum breaking strength of the specimen being tested. A stress-strain curve shall be plott
35、ed to the ropes breaking strength. 4.5 FAILURE MECHANISM. The failure mechanism shall be determined by testing one rope sample from each lot. distance between the outer ends of the splices shall be 16 meters (50 feet) in length. The sample failure will be considered satisfactory if the time between
36、the first and second ruptures of the strands is at least 10 seconds when tested in accordance with method 6015 of Fed Std 191. This sample shall meet the breaking strength requirements of Table III. The 4.6 LAY LENGTH. The lay length shall be determined in accordance with method 6000 of Fed Std 191.
37、 4.7 DETERMINATION OF SPLICEABILTY. A breaking strength specimen shall be prepared and tuck spliced with the lay at each end with six full strand tucks. The specimen shall then be allowed to rest for 24 hours. Four of the tucks shall then be backed out of the rope. rope from which the tucks are remo
38、ved shall be examined for distortion of the strands. The portion of the 4.8 TEST PROCEDURES. The manufacturer shall submit testing procedures in writing to the Government Inspector prior to any testing. 4.8.1 SAMPLE IDENTIFICATION. Each sample unit or sample specimen shall be marked for identificati
39、on in determining the lot or sample unit from which the specimens were taken. CONTRACTOR CERTIFICATION. The contractor shall certify and maintain substantiating evidence that the rope offered meets the characteristics of this Commercial Item Description, and that the product conforms to the producer
40、s own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract. 7 Provided by IHSNot for ResaleNo reproduct
41、ion or networking permitted without license from IHS-,-,-I _- A-A-50435B 40 = 9999974 O064684 7 C. -% A-A-50435B f RESPONSIBILITY FOR COMPLIANCE. All items shall meet all requirements of this Commercial Item Description. The Government will provide a Quality Assurance Representative to select the sa
42、mples to be tested, witness all visual inspections, physical testing, and certify that each lot meets all requirements of this Commercial Item Description at the source. Sampling and inspection in quality conformance does not authorize submission of known defective material, either indicated or actu
43、al, nor does it commit the Government to acceptance of defective material. Failure to meet any of the requirements of this Commercial Item Description shall be cause for rejecting the entire lot. Retesting of the lot shall not be permitted. The Naval Sea Systems Command (Code 56W2) reserves the righ
44、t to observe each test of conformance prior to the first delivery of each size of aramid rope specified in the Commercial Item Description offered by each manufacturer to the Government. The Manufacturer shall inform the Naval Sea Systems Command (Code 56W2) and the contracting officer of testing sc
45、hedules at least 3 weeks prior to testing. PRESERVATION, PACKAGING, PACKING, AND MARKING. Unless otherwise specified in the contract or purchase order, preservation, packaging, packing, and marking shall be in accordance with ASTM D 3951. Orderinq Data. Purchaser should specify the following: (a) Ti
46、tle, number, and date of this commercial item (b) Circumference required (see Physical Properties). (c) When continuous lengths, other than standard, are (d) If purchaser will accept any unit which has been description. required (see Put Up). shortened or cut for test specimens if in complete compli
47、ance with this Commercial Item description. The reel shall be marked as to actual length. MILITARY INTERESTS: Custodians Navy - SH Review activity DLA-DISC 8 Preparing activity: (Project 402 0-N028) Navy - SH Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
