1、INCH-POUNDMIL-DTL-24050E25 JANUARY 1999SUPERSEDINGMIL-R-24050D31 July 1991DETAIL SPECIFICATIONROPE, FIBROUS - DOUBLE-BRAIDED (NYLON)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-braid
2、ed nylon fibrous 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 additionalinformatio
3、n 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 Specification
4、s, 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 Standards (DODI
5、SS) 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 data which
6、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 N/A FSC 4
7、020DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2MIL-DTL-24050ESTANDARDSFEDERALFED-STD-191 - Textile Test Methods.(Unless otherwise indicated, copies of the above spe
8、cifications, standards and handbooks are available from theStandardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)2.3 Non-Government publications. The following document(s) form a part of this document to the extentspecified herein. Unless otherwise specif
9、ied the issues of the documents which are DOD adopted are those listed inthe issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed inthe DoDISS are the issues of the documents cited in the solicitation. (see 6.2)AMERICAN SOCIETY FOR TESTING AND
10、 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 Textile FibersD 2257
11、- Standard Test Method for Extractable Matter in Yarns.D 2258 - Standard Practice for Sampling Yarn for Testing.(Application for copies should be addressed to American Society for Testing and Materials, 100 Barr HarborDrive, West Conshohocken, PA 19428-2959).2.4 Order of precedence. In the event of
12、a conflict between the text of this document and the references citedherein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable lawsand regulations unless a specific exemption has been obtained.3 REQUIREMENTS3.1 First article. When specified (see 6.2
13、), a sample shall be subjected to first article inspection (see 6.4) inaccordance with 4.2.3.2 Other identification and put-up. Unless otherwise specified, the requirements specified herein apply todouble-braided nylon ropes purchased as a component for an end item by a contractor and to double brai
14、ded nylonropes purchased directly by the government, except that the requirements specified in 3.9 and 3.10 apply only todouble braided nylon ropes purchased directly by the government.3.3 Materials. The inner and outer braids shall be fabricated from bright, white, virgin, continuous filament,heat
15、and light resistant nylon fiber. The nylon shall be a long chain polymer made of hexamethylene diamine andadipic acid, or a long chain polymer of epsilon amino caproic acid. The average fiber linear density per filamentshall not be less than 5.0 denier per filament or more than 20 denier per filamen
16、t. The fiber tenacity shall not beless 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 nylon fibers with a marineoverlay finish that will ensure in the marine environment that the rope will give improved performance that isbe
17、tter than that of rope made of fibers without a overlay finish. The overlay finish must be highly water insoluble,must resist wash off due to contact with water, and have long term durability with respect to evaporation andreaction with ordinary outdoor marine environments. The finish shall improve
18、the ability toresist internal fiber-to fiber abrasion and external abrasion (see 4.3.1). The overlay finish provided shall notviolate any other requirement of this specification.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3MIL-DTL-24050E3.4 Const
19、ruction. The rope shall conform to the requirements specified herein. The rope shall be a doublebraided construction wherein an inner braid of hollow structure manufactured in a separate operation shall serve asthe core, while a cover (outer braid) is braided over it in a second operation. The weigh
20、t of either the inner braidor the outer braid shall not exceed 55 percent of the total weight of the rope. Heat setting of the yarns or finishedrope shall not be acceptable. Mixing of nylon fiber types, grades, or fibers of different manufacturers within thecore or within the cover shall not be perm
21、itted. Nylon fibers used in the core may, however, differ in type, grade ormanufacturing source from those used in the cover, provided that all the fiber components meet the requirementsof 3.3. If the breaking elongation of the fibers used in the core and in the cover braids are different, the highe
22、relongation fiber shall be used in the core.3.4.1 Yarns. The fiber producer shall provide type of yarn that has been designated for cordage and tested forits suitability for this application (see 6.3) Core yarns shall be one size and cover yarns shall be one size. In themanufacture of each braid, on
23、e half of the yarns shall have an “S” twist, while the remaining yarns shall have a“Z” twist. All yarns shall have sufficient twist such that the filaments on the outer surface of the inner and outerbraids are parallel to the axis of the rope. The type of braid, number of strands, yarns per strand,
24、and multipliersfor the respective inner and outer braids shall be in accordance with tables I and II.TABLE I. Structural requirements for inner braid or core.Rope size,nominal, circumference,(inches) Type ofbraidNumberofstrandsYarns per strandMin MaxMultiplier fordeterminationof pick countMin Max3/4
25、 to 2 - 1/43/4 to 2 - 1/4PlainTwill8122 61 41.5 1.92.5 3.22 - 1/2 to 7 - 1/22 - 1/2 to 7 - 1/22 - 1/2 to 7 - 1/2PlainTwillTwill812162 61 41 31.5 1.92.5 3.23.0 3.88 to 168 to 16TwillTwill12161 41 32.5 3.23.0 3.8TABLE II. Structural requirements for outer braid or cover.Rope sizenominal, circumference
26、(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 9.65 to 16 Twill 32 1 2 9.5 11.03.4.2 Multipliers. Multipliers specified in tables I a
27、nd 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 (see table III) for the nominal rope size and shall be used in all calculations for the inner andouter braids as
28、appropriate. The calculation shall be as follows:Multiplier = pick count times circumference.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4MIL-DTL-24050ETABLE III. Physical Properties.Circumferenceat load P(nominal inches)Diameter(nominalinches)Lo
29、ad P(pounds)Linear densityplus or minus5 percent(pounds/100 feet)Breaking strength(minimum pounds)3/4 1/4 13 1.52 17851 5/16 20 2.38 28351 - 1/8 3/8 28 3.42 40951 - 5/16 7/16 38 4.65 53551 - 1/2 1/2 50 6.06 72451 - 3/4 9/16 63 8.26 94502 5/8 78 10.8 126002 - 1/4 3/4 113 13.9 157502 - 1/2 13/16 132 1
30、6.7 193202 - 3/4 7/8 153 20.4 236253 1 200 24.3 278253 - 1/2 1 - 1/8 253 33.1 378003 - 3/4 1 - 1/4 313 38.0 441004 1 - 5/16 345 43.3 504004 - 1/2 1 - 1/2 450 54.6 642005 1 - 5/8 528 67.6 781105 - 1/2 1 - 3/4 613 82.0 963006 2 800 97.1 1096756 - 1/2 2 - 1/8 903 114.0 1316107 2 - 1/4 1013 132.0 149800
31、7 - 1/2 2 - 1/2 1250 152.0 1712008 2 - 5/8 1378 173.0 1926009 3 1800 219.0 24300010 3 - 1/4 2113 270.0 28484011 3 - 1/2 2450 327.0 35100012 4 3200 389.0 41580013 4 - 1/4 3613 450.0 47520014 4 - 1/2 4050 524.0 54864015 5 5000 600.0 62208016 5 - 1/4 5513 685.0 7020003.4.3 Texture. The texture of the f
32、inished 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 relaxed state.3.5 Physical requirements. The finished rope shall conform to the physical properties specified in table IIIwhen tested as specifi
33、ed in 4.5. The circumference in accordance with table III shall be as specified (see 6.2).3.5.1 Elongation. The elongation of the ropes shall not exceed 40 percent at the minimum breaking strengthwhen determined as specified in 4.5.5. The load elongation curve, drawn autographically, shall not exhib
34、itevidence of sudden changes in load applications greater than 5 percent of the load weighted at the instant ofchange. Changes due to splice slippage shall not be considered in this determination.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5MIL-D
35、TL-24050E3.6 Extraneous material. No extraneous material shall be added for the purpose of weighting the rope. Theextractable matter of the finished rope shall not exceed 4.0 percent when tested as specified in 4.5.6.3.7 Moisture content. The moisture content of the rope shall not exceed 5.0 percent
36、 when tested as specifiedin 4.5.8.3.8 Identification marker. The double braided nylon rope shall be identified by a water-resistant markerinserted between the braids in all ropes larger than 1 - 1/8 inch circumference. Unless otherwise specified (see6.2), the manufacturers name, the year of manufact
37、ure, and type of fiber (nylon) shall be printed on the marker inbold, easy-to-read type which shall be clearly printed on the marker. Italic or script type shall not be used. Theprinting shall not be affected by exposure to saltwater or mineral oil, when tested as specified in 4.5.7.3.9 Identificati
38、on tag. In addition to the requirements specified in 3.8, a ticket (identification tag) shall beattached to each package unit. The ticket shall be in accordance with type B, class 1, size 4 or 5, 15 CSU gradedesignator of UU-T-81. The ticket shall be legibly printed, stamped, or typed with water ins
39、oluble ink. The ticketshall 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 Name3.10 Put-up. Unless otherwise specified (see 6.2), the rope shall be furnished without knots
40、 or splices on nonreturnable reels not larger than 7 feet in diameter. Unless otherwise specified (see 6.2), multiple lengths shall bepermitted in the same put-up. When specified (see 6.2), continuous lengths, other than a standard length, may beused. The rope shall be ordered by weight, as specifie
41、d (see 6.2). Delivered weight per reel shall be within plus 10percent minus 0 percent of the weight specified in table IV. The weight for lengths other than standard shall bedetermined in accordance with table IV with the proper length ratio applied. However, the actual length shall benot less than
42、the standard length, when measured in a 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 brai
43、der splices be present in the core or the cover of any size and length of rope, some methods ofmanufacture impose limitations. To compensate for these limitations, braider splices shall be in accordance with3.10.1.1 through 3.10.1.3.3.10.1.1 Standard length or less. To allow for a braider malfunctio
44、n, one braider splice shall be permitted inthe core and in the cover for standard length or less as specified in table IV.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6MIL-DTL-24050ETABLE IV. Put-Up.Circumference(inches)Diameter(inches)Standard le
45、ngth(feet)Net weight perstandard length(pounds)3/4 1/4 600 9.61 5/16 600 151 - 1/8 3/8 600 21.51 - 5/16 7/16 600 29.31 - 1/2 1/2 600 38.21 - 3/4 9/16 600 52.12 5/8 600 682 - 1/4 3/4 600 86.32 - 1/2 13/16 600 1062 - 3/4 7/8 600 1283 1 600 1533 - 1/2 1 - 1/8 600 2093 - 3/4 1 - 1/4 600 2394 1 - 5/16 60
46、0 2734 - 1/2 1 - 1/2 600 3445 1 - 5/8 600 4265 - 1/2 1 - 3/4 600 5176 2 600 6126 - 1/2 2 - 1/8 600 7187 2 - 1/4 600 8327 - 1/2 2 - 1/2 600 9588 2 - 5/8 600 10909 3 600 138010 3 - 1/4 600 170011 3 - 1/2 600 206012 4 600 245013 4 - 1/4 600 284014 4 - 1/2 600 330015 5 600 378016 5 - 1/4 600 43203.10.1.
47、2 Continuous lengths greater than standard lengths. To compensate for random strand failures whencontinuous lengths are greater than standard lengths and up to 1200 feet maximum, an additional braider spliceshall be permitted in the core and in the cover. In producing the splices the distance of the
48、 overlapping shall beequivalent to 8 times the circumference in inches but not less than 24 inches for ropes whose sizes are 3 inches incircumference and less. If more than one of these splices are in the same strand they shall be at least 20 feet apartmeasured from splice center to splice center.3.10.1.3 Splice acceptance. Because splices within the core are difficult to detect after application of thecover,
