1、INCH-POUNDMIL-DTL-24677B25 JANUARY 1999SUPERSEDINGMIL-R-24677A1 August 1991DETAIL SPECIFICATIONROPE, FIBROUS - DOUBLE-BRAIDED (POLYESTER)This specification is approved for use by all Departments and Agenciesof the Department of Defense.1. SCOPE1.1 Scope. This specification covers one type of double-
2、braided polyester fiberous rope for general purpose use.2. APPLICABLE DOCUMENTS2.1 General. The documents listed in this section are specified in sections 4 and 5 of this specification. Thissection does not include documents cited in other sections of this specification or recommended for additional
3、information or as examples. While every effort has been made to insure the completeness of this list, documentusers are cautioned that they must meet all specified requirements documents cited in sections 4 and 5 of thisspecification, whether or not they are listed.2.2 Government Documents.2.2.1 Spe
4、cifications, standards and handbooks. The following specifications, standards and handbooks form apart of this document to the extent specified herein. Unless otherwise specified the issues of these documents arethose listed in the issue of the Department of Defense Index of Specifications and Stand
5、ards (DoDISS) andsupplement thereto, cited in the solicitation (see 6.2).SPECIFICATIONSFEDERALUU-T-81 - Tags, Shipping and StockDEPARTMENT OF DEFENSEMIL-L-17331 - Lubricating Oil, Steam Turbine and Gear, Moderate Service.Beneficial comments (recommendations, additions, deletions) and any pertinent d
6、ata which may be of use inimproving this document should be addressed to: Defense Industrial Supply Center, ATTN: DISC-BBEE, 700Robbins Avenue, Philadelphia, PA 19111-5096 by using the Standardization Document Improvement Proposal(DD Form 1426) appearing at the end of this document or by letter.AMSC
7、 N/A FSC 4020DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24677B2STANDARDSFEDERALFED-STD-191 - Textile Test Methods.(Unless otherwise indicated, copies of the
8、 above specifications, standards and handbooks are availablefrom the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5096.)2.3 Non-Government publications. The following document(s) form a part of this document to the extentspecified herein. Unless otherw
9、ise specified, the issues of these documents which are DoD adopted are those listedin the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listedin the DoDISS are the issues of the documents cited in the solicitation (see 6.2).American Society Fo
10、r Testing and Materials (ASTM)D 885 - Standard Methods of Testing Tire Cords, Tire Cord Fabrics, and Industrial Filament Yarns Made From Man - Made Organic Base Fibers.D 1141 - Standard Specification for Substitute Ocean Water. (DoD Adopted)D 1577 - Standard Test Methods for Linear Density of Textil
11、e Fibers.D 2257 - Standard Test Method for Extractable Matter in Textiles. (DoD Adopted)D 2258 - Standard Practice for Sampling Yarn for Testing.(Application for copies should be addressed to the American Society for Testing and Materials, 100 BarrHarbor Drive, West Conshohocken. PA 19428-2959.)2.4
12、Order of Precedence. In the event of a conflict between the text of this document takes precedence.Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption hasbeen obtained.3. REQUIREMENTS3.1 First Article. When specified (see 6.2), a sample shall be
13、subjected to first article inspection (see 6.4) inaccordance with 4.2.3.2 Other identification and put-up. Unless otherwise specified (see 6.2), the requirements specified in 3.9and 3.10 apply to double braided polyester ropes purchased directly by the Government. Other requirements applyto double b
14、raided polyester ropes purchased as a component for an end item by a contractor and to double braidedpolyester ropes purchased directly by the Government.3.3 Materials. The inner and outer braids shall be fabricated from bright white, virgin, continuous filament,heat and light resistant polyester fi
15、ber. Polyester fiber is a long chain synthetic polymer composed, at least 85percent by weight, of an ester of a substituted aromatic carboxylic acid, including but not restricted to substitutedterephthalate units and parasubstituted hydroxybenzoate units. The average fiber linear density per filamen
16、t shallnot be less than 5.0 dinear per filament. The fiber tenacity shall not be less than 8.0 grams per denier (see 4.3.1).3.3.1 Fiber finish. Unless otherwise specified (see 6.2), the manufacturer shall use polyester fibers with amarine overlay finish that will ensure in the marine environment tha
17、t the rope will give improved performance thatis better than that of the rope made of fibers without an overlay finish. The overlay finish must be highly waterinsoluble, must resist wash off due to contact with water, and have long term durability with respect to evaporationand reaction with ordinar
18、y outdoor marine environments. The finish shall improve the ability to resist internalfiber to fiber abrasion and external abrasion (see 4.4.1). The overlay finish provided shall not violate any otherrequirements of this specification.Provided by IHSNot for ResaleNo reproduction or networking permit
19、ted without license from IHS-,-,-MIL-DTL-24677B33.4 Construction. The rope shall be double braided construction wherein an inner braid of hollow structuremanufactured in a separate operation shall serve as the core, while a cover (outer braid) is braided over it in asecond operation. The weight of e
20、ither constituent, the inner braid or the outer braid, shall not be greater than 55percent of the total weight of the rope. Heat setting by the rope manufacturer of yarns or finished rope shall not beacceptable. Polyester fibers of different types or grades, or fibers of different manufacturers shal
21、l not be mixedwithin the core or within the cover. Polyester fibers used in the core may, however, differ in type, grade, ormanufacturing sources from those used in the cover, provided fiber components meet the requirements of 3.3. Ifthe braking elongation of the fibers used in the core and in the c
22、over are different, the higher elongation fiber shallbe used in the core.3.4.1 Yarns. Core yarns shall be one size and all cover yarns shall be one size, the producer shall provide typeof yarn that has been designed for cordage and tested for its suitability for this application (see 6.3). In theman
23、ufacture of each braid, one half of the yarns shall have an “S” twist, while the remaining yarns shall have a“Z” twist. Yarns shall have sufficient twist so that the filaments on the outer surface of the inner and outer braidsare essentially parallel to the axis of the rope. The type of braid, numbe
24、r of strands, yarns per strand, andmultipliers for the respective inner and outer braids shall be as specified in tables I and II.TABLE I. Structural requirements for inner braid or core.Rope size,nominal, circumference,(inches) Type ofbraidNumberofstrandsYarns per strandMin MaxMultiplier fordetermi
25、nationof pick countMin Max3/4 to 2 - 1/43/4 to 2 - 1/4PlainTwill8122 61 41.3 1.92.0 3.22 - 1/2 to 7 - 1/22 - 1/2 to 7 - 1/22 - 1/2 to 7 - 1/2PlainTwillTwill812162 61 41 31.3 1.92.0 3.23.0 3.88 to 168 to 16TwillTwill12161 41 32.0 3.23.0 3.8TABLE II. Structural requirements for outer braid or cover.Ro
26、pe sizenominal, circumference(inches)Type ofBraidNumberofstrandsYarns perStrandMin MaxMultiplier fordetermination ofpick countMin Max3/4 to 1 - 1/2 Twill 16 2 3 6.0 7.01 - 1/2 to 2 - 1/4 Twill 20 2 2 6.8 7.82 - 1/4 to 5 - 1/2 Twill 24 2 2 7.6 8.65 to 16 Twill 32 1 2 9.0 11.03.4.2 Multipliers. Multip
27、liers shown in tables I and II overcome the complexity of listing a range of pickcounts for every size. Pick count and circumference for either the inner or outer braid shall be measured at theappropriate load P (table III) for the nominal rope size and shall be used in all calculations for the inne
28、r and outerbraids as appropriate. The calculation is as follows:Multiplier - pick count times circumference.3.4.3 Texture. The texture of the finished rope shall be firm without sleaziness, and the cover (outer braid)shall fit closely around the core (inner braid) when inspected with the rope in a r
29、elaxed state.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24677B43.5 Physical requirements. The finished rope shall conform to the physical properties specified in table IIIwhen tested as specified in 4.5. The circumference shall be as spe
30、cified in table III (see 6.2)TABLE III. Physical Properties.Circumferenceat load P(nominal inches)Diameter(nominalinches)Load P(pounds)Linear densityplus or minus5 percent(pounds/100 feet)Breaking strength(minimum pounds)3/4 1/4 13 2.0 19001 5/16 20 3.1 29351 - 1/8 3/8 28 4.5 42451 - 5/16 7/16 38 6.
31、1 57301 - 1/2 1/2 50 8.0 75001 - 3/4 9/16 63 10.1 94502 5/8 78 12.5 116602 - 1/4 3/4 113 17.9 166102 - 1/2 13/16 132 21.1 195802 - 3/4 7/8 153 24.4 226603 1 200 31.9 294803 - 1/2 1 - 1/8 253 40.4 372903 - 3/4 1 - 1/4 313 49.8 458704 1 - 5/16 345 55.0 506004 - 1/2 1 - 1/2 450 71.8 610005 1 - 5/8 528
32、84.0 740005 - 1/2 1 - 3/4 613 97.7 840006 2 800 128.0 1050006 - 1/2 2 - 1/8 903 144.0 1180007 2 - 1/4 1013 161.0 1336007 - 1/2 2 - 1/2 1250 199.0 1620008 2 - 5/8 1378 220.0 1800009 3 1800 287.0 23200010 3 - 1/4 2113 337.0 27700011 3 - 1/2 2450 419.0 33500012 4 3200 510.0 39615013 4 - 1/4 3613 576.0
33、44650014 4 - 1/2 4050 646.0 50065015 5 5000 798.0 61655016 5 - 1/4 5513 879.0 6792503.5.1 Elongation. The elongation of the rope shall not be greater than 30 percent at the minimum breakingstrength when determined as specified in 4.5.5. The load elongation curve, drawn autographically, shall notexhi
34、bit evidence of sudden changes in load applications greater than 5 percent of the load weighed at the instanceof change. Changes due to splice slippage shall not be considered in this determination.3.6 Extraneous material. No extraneous material shall be added for the purpose of weighting the rope.
35、Theextractable matter of the finished rope shall not be greater than 5 percent when tested as specified in 4.5.6.MIL-DTL-24677BProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24677B53.7 Moisture content. The moisture content of the rope shall
36、 not be greater than 4 percent when tested asspecified in 4.5.8.3.8 Identification marker. The manufacturer shall identify his product by inserting a water-resistant markerbetween the braids in all ropes larger than 1 - 1/8 inches circumference. Unless otherwise specified (see 6.2), themanufacturers
37、 name, the year of manufacture, and type of fiber (Polyester) shall be printed on the marker in bold,easy to read type. Italic or script type shall not be used. The printing shall not be affected by exposure to salt wateror mineral oil when tested as specified in 4.5.7.3.9 Identification tag. In add
38、ition to the requirements specified in 3.8, each package unit shall have a ticked(identification tag) attached for identification purposes. The ticket shall conform to type B, class 1, size 4 or 5, 15CSU grade of UU-T-81. The ticket shall be legibly printed, stamped, or typed with water insoluble in
39、k. Theticket shall contain the following information:(a) Stock number(b) Nomenclature(c) Specification number(d) Length(e) Contract number and date(f) Date of manufacture and year(g) Contractors name.3.10 Put - up. Unless otherwise specified (see 6.2), the rope shall be furnished without knots or sp
40、lices onnonreturnable reels not larger than 7 feet in diameter. Unless otherwise specified (see 6.2), multiple lengths shallbe permitted in the same put-up. When specified (see 6.2), continuous lengths, other than a standard length, maybe used. The rope shall be ordered by weight. Delivered weight p
41、er reel shall be within plus 10 percent, minus 0percent of the weight specified in table IV. The weight for lengths other than standard shall be determined inaccordance with table IV with proper length ratio applied. However, the actual length shall be not less than thestandard length when measured
42、in the relaxed condition.3.10.1 Braider splices. Braider splices shall be the overlapping continuation of a single interrupted strand (ormultiple strand) with another identical strand which follows the identical path in the braid. Although it isdesirable that no braider splices be present in the cor
43、e or the cover of any sizes and length of rope, some methodsof manufacture impose limitations. To compensate for these limitations, the following shall be acceptable:3.10.1.1 Standard length. To allow for a braider malfunction, one braider splice shall be permitted in the coreand in the cover for or
44、ders specifying standard length or less as listed in table IV.3.10.1.2 Continuous lengths. To compensate for random strand failures when continuous lengths are greaterthan standard lengths and up to 1200 feet maximum, an additional braider splice shall be permitted in the core andin the cover. In pr
45、oducing the splices the distance of the overlapping shall be equivalent to 8 times thecircumference in inches but not less than 24 inches for ropes whose sizes are 3 inches in circumference and less. Ifmore than one of these splices are in the same strand they shall be at least 20 feet apart measure
46、d from splicecenter to splice center.3.10.1.3 Splice acceptance. Because splices within the core are difficult to detect after application of thecover, the number of braider splices within the core shall be identified (see 6.3).3.11 Workmanship. The ends of all rope shall be cut off squarely and sec
47、urely whipped, taped, or heat sealed.The reels shall be wound so that each turn and layer is free from entanglement. The component braid and thefinished braided rope shall conform to the quality and grade of product established by this specification.Provided by IHSNot for ResaleNo reproduction or ne
48、tworking permitted without license from IHS-,-,-MIL-DTL-24677B6TABLE IV. Put-Up.Circumference(inches)Diameter(inches)Standard length(feet)Net weight perstandard length(pounds)3/4 1/4 600 12.61 5/16 600 19.51 - 1/8 3/8 600 28.41 - 5/16 7/16 600 38.41 - 1/2 1/2 600 50.41 - 3/4 7/16 600 63.62 5/8 600 78.82 - 1/4 3/4 600 112.82 - 1/2 13/16 600 133.02 - 3/4 7/8 600 154.03 1 600 201.03 - 1/2 1 - 1/8 600 255.03 - 3/4 1 - 1/4
