1、 - flIL-DTL-18295F m 9999906 2059029 T7b m INCH-POUNDI MIL-DTL- 18295F 30 Janw 1998 SUPERSEDING 14 April 1992 MIL-C-18295E DETAIL SPECIFICATION CHAINS AND F“GS FOR FLEET MOORING This specification is approved for use by ail Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. T
2、his specification establishes the requirements for the manufacture, physical performance, and acceptance of mooring chain assemblies. Mooring chain assemblies are to be subjected to long term submergence in seawater and may be subjected to open storage in a marine environment. 1.2 Classification. Fl
3、eet mooring chain assemblies, unless obiesWise specified, are classified and identified as fdlows: Mooring Chain Assembly: Group1 - Chain Type 1 - Chain link With studs modified to accept cathodic protection. Type 2 - Chain link with studs not modified to accept cathodic protection. Beneficial comme
4、nts, recommendaticms, additions, deletions, clarifications, etc. and any data which may improve his document should be sent to: Commanding cer (Code 15E2), Naval Construction Battalion Center, 1000 23d Avenue, Port Hueneme, CA 930434301, by using the Standardization Document Improvement Proposal D F
5、orm 1426) appearing at the end of this document or by letter. AMSC N/A FSC 4010 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- GroupII - Groupm - GroupIv - MIL-DTL-LB295F 9999906 2059030 798 MLDTZ 18295F Shade Type 1 - Swivel shackle. Type 2 - Plat
6、e sinker shackle. Type 3 - Anchor shade. Type 4 - Joining shackle. Type 5 - Buoy shackle. Links Type 1 - Chain joining link. Type 3 - Anchor joining link Type 4 - End link Type 2 - Pear link. Miscellaneous Type 1 - Ground ring. Type 2 - Spider plate. 2. APPLICABLE DOCUMENTS 2.1 General. The document
7、s listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list,
8、document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document
9、 to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS TT-v-5 1 - VarnishAsphalt.
10、TT-P-1757 - Primer Coating, Zinc Chromate, Low Moisture-Sensitivity. VV-G-671 - Grease,Graphite. MILITARY MIL-1-45208 - General Specifidon for Inspection Requirements. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - - - MIL-DTL-18295F 9999906 20
11、59033 624 T MIL-DTL- 18295F L STANDARDS FEDERAL FED-STD-3 13 - Material Safety Data, Transportation Data and Disposal Data for Hazardous Matends Furnished to Government Activities. MTLITARY MIL-STD-248 - Welding and Brazing Procedure! and Perfommce Qualification. MIL-STD-271 - Requirements for Nonde
12、structive Testing Methods. MIL-STD-1265 - Radiographic Inspection, Classification, and Soundness Requirements for Steel castings. MIL-STD-2035 - Nondestructive Testing Acceptance Criteria. (nless otherwise indicated, copies of the above specifications and standards are available fiom the Defense Aut
13、omated Printing Services, An: DoDSSP, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.3 Non-Government publications. The following documents fm a part of this document to the extent specified herein. Unless ram (kg) lbs (kg) Ibs (kg) 247,000 (1 12 037) 352,000 (159 664) 2,590 (1 17
14、5) 454,000 (205 931) 2.25 (5n 396,000 (179 622) 570.000 (258 54n 4.250 (2 278) ” Except plate sinker shackles, split keys, tapered pins, and lead plugs. 2.50 (63) 2.75 (70) 3.00 (76) 3.3,l Plate sinker shackles. The requirements specified in tables I and II do not apply to plate sinker shackles and
15、their bolts. Shackle material and fabrication shall be in accordance with figure 7. Surface inspection as required in 4.6.3 and proof and break loads required herein are the only test requirements for the plaie sinker shde. The following proof and break loads shall apply: 484,000 (219 538) 692,000 (
16、313 886) 5,270 (2 390) 578,000 (262 176) 826,000 (374 667) 6,410 (2 908) 679,000 (307 989) 970,000 (442 894) 7,650 (3 493) Nominal chain size inch (mm) 1.75 to 2 (44 to 51) 2.25 to 4 (57 to 102) Proof lbs Oc.& 60,000 (27 216) 120,000 (54 43 1) Break min. lbs kg) 135,000 (61 235) 200,000 (90 718) 3.5
17、0 (89) 4.00 (102) 3.3.2 Weipht of each shot. The weight of each shot shall be not less than that specified in table II. 900,000 (408 233) 1,285,000 (582 866) 10,500 (4 763) 1,143,000 (518 456) 1,632,000 (874 621) 13,700 (6 214) 3.3.3 Lead Dlug. Ail chain and anchor joining links, swivel shackles, jo
18、ining shackles, and anchor shackle shall include a lead plug for each tapered retaining pin which will be hammered into the dovetail chamber to securely hold the pin in place. The lead plug shail be sized for the specific nominal size component. The least diameter of the plug shail be the same as th
19、e largest diameter of the apered pin. The plug shall mushroom out when hammered to completely fill the dovetail chamber. The lead plug shall not be inserted by the manufcturer (see figure 5a). Lead plugs shall be packed separately by Size and clearly marked. 3.3.4 TaDered - ins and split keys. All j
20、oining links, swivel shackles, joining shackles, and the anchor joining shackle shall have tapered pins for dng the main pin in place. The chamber which accepts the tapered pin shall be dovetailed at the larger end of the pin hole to retain the lead plug specified in section 3.3.3, The tapered pin s
21、hall fit in the chamber flush with the bottom of the dovetail section to allow room for the lead plug. Tapered pins and split keys are exempt from the physical, mechanical, and metallurgicai requirements of the link proper. Swivel shackles shall have two tagered pins securing each main pin. The spli
22、t keys and tapered pins shall be corrosion- resistant steel (CRS) confonnng to class 3 16 of ASTM A 240. The fit for tapered pins shall be interference fit and for split keys shall be locationai clearance fit as specified in ASME B4.1 (see figures 2,3,5, 5% 5b, 10, 11, and 12). Provide extra tapere
23、pins, split keys, and lead plugs when specified (see 6.2). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-18295F m 9999906 2059036 Lob m MILDTz- 1 8295F 3.3.5 Joining links. The design of all joining links shall be as shown on figures 2 an
24、d 3. All of the constituent parts of each joining link shall have tolerances sdlicimtly small to eliminate slack or internal displacement of the parts. No sharp corners shall be allowed. 3.3.6 GrouD L tyD e 1. Unless otherwise specified (see 6.2), type 1 fleet mooring chain assemblies shall have cha
25、in studs modified as described in 3.3.6.1 and 3.3.6.2. 3.3.6.1 Anode mounting hole. A 0.375-inch (9.5 mm) 16 UNC-2B hole shall be tapped in the chain stud as specified on figure lb. Following heat traiment and satisfactory inspection of the chain, the hole shall be filled with graphite grease confor
26、ming with W-G-671, grade 2. The hole shall be fitted with a screw as shown on figure IC to prevent the hole from being filled with coating material. The screw shall be CRS class 3 16 of ASTM A 240,0.375-inch (9.5 mm) 16 UNC-2A thread by 0.50-inch (13 mm) long with a hexagon head. The manufacturer sh
27、all ensure that the threads of the anode mounting hole are not damaged due to overtightening the Screw. 3.3.6.2 Alignment and orientation of anode mounting hole. The stud shall be placed in the link so that the threaded hole is aligned as specified on figure lb. The studs shall be oriented so that t
28、he threaded holes face alternately, as shown in figure Id. 3.3.7 Swivel shackle. The swivel shackle shall conform to the mechanical, physical, and chemical requirements of tables I, II, III, and in general to the configuration of figures 5,5a, and 5b. The swivel shaft and body shall not separate by
29、actions produced during any mooring situation for the life of the mooring assembly. The swivel body shall rotate on the shaft while suspended while holding a weight equivalent to one shot of its associated chain size (see 4.6.4). One method of retaining the shaft into the body shall be by beaded sha
30、ft and nut with coarse, UNR, or ACME threads and double phosphorous bronze washers with locking device. A second method shall be with double phosphorous bronze washers and a button and peening the shaft. Unless specified in the contract, the method of retaining the shaft in the body shall be the man
31、dacturers option of one of the two methods specified herein. The retainer nut or button may be welded to the shaft for locking unless otherwise specified (see 6.2). 3.3.7.1 Compatibility. The swivel shall be compatible with the intended component parts of the mooring chain assembly, The component pa
32、rts, when atached to the swivel shackle shall be free to hinge 15 degrees from the long axis of the component parts and swivel shackle at every 90 degrees (O degrees, 90 degrees, 180 degrees, and 270 degrees) on the circular plane perpendidar to the long axis. For refmce, O degrees on he circular pl
33、ane is parallel to the shackle main pins. 3.3.7.2 Shackie pins. Unless otherwise specified (see 6.2), the shackle pins shall have a locational clearance fit as specified in ASME B4.1. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-18295F H
34、 0b 2059037 042 MILDTG18295F 3.3.8 Spider plate. Hole 1, as specified on figure 6, shall be compatible with the small end of 3.5-inch (89 mm) and 4-inch (102 mm) nominai chain size anchor joining links and shail meet the proof and break load requirements of 4-inch (102 mm) chain. Holes 2 and 3 shall
35、 be compatible with the large end of 2.25-inch (57 mm), 2.5-inch (64 mm), and 2.75-inch (70 mm) anchor joining links and shall meet the proof and break load requirements of 2.75-inch (70 mm) anchor chain (see figures 6 and 15). 3.4 Materials and manufhturinsz techniaues. Materials and manufcming tec
36、hniques shall be as specified herein and in applicable specifications and standards, and der refrenced documents. Materiais not specified shall be selected by the contractor and shall be subject to all provisions of this specification. Materials shall be free of defects which adversely atEect perfor
37、mance or serviceability of the finished product. 3.4.1 Process of steel manufacture. The steel to be used for the manufacture of chain assemblies shall be made by the open hearth, basic oxygen electric mace, or other such process as may be specifically approved. The steel shall be produced using fin
38、e grain practice. 3.4.2 Chemical mDosition. The component manufbturer shall use steel that meets the specifications of SAE 5404, class 1330 and 4340 (UNS G13300 and 643400) as modified in table II. The chemical composition of the steel for the component manufacture shall be determined by the steelma
39、ker or component manufhcmr an samples taken fiom each heat of steel in accordance with ASTM A 751. The chemical composition for each heat of steel shall be part of the CoC (see 4.3 and 6.7.1) from the steelmaker or component manufacturer. Table III does not include pear links, plate shackles, split
40、keys, lead plugs, or tapered pins. The chemical composition for pear iinks is to be determined by the manufacturer to meet requirements of table I and submitted with test reports. TABLE m. Chemicai composition ladle analysis . Nitmgen 0.015 Chromium 0.250 0.70 0.900 Copper 0.350 9 Provided by IHSNot
41、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-18295F 999990b 2059038 T89 MILDTL- 18295F TABLE III. Chemical comuosition ladle analysis - Continued. Notes: ” Not less thanone of these grain finingelemenis shall be usedinemughquantity to ensure afine grain stn
42、icaire for chain and accessories. Table III does not inclizde pear li&, piate sinker shackles, split keys, lead plugs, or tapered pins. Chemical composition for pear links is to be determined by the mamhdwer to meet requirements of table I and submitted with test i.epoas (see 3.4.2). 3 Conformingto
43、SAE J404, class 1330 and 4330. 3.4.3 Heat treatment. All welding shall be completed prior to heat treatment. All inspection or testing of the finished component shall take place after heat treatment. Components shall be normalized above the transformation temperature or quenched and tempered, as req
44、uired, to produce a uniform fine grain structure which obtains mechanical properties to meet specifications. Welded components shall not be quenched. All heat treating equipment shall be automatically controlled and regularly checked. Temperature time charts shall be kept and be a part of the CoC (s
45、ee 4.2). 3.4.4 Microstrucure. The grain size of each component shall be uniform hroughout the cross section of the finished component. Grains shall be equal to or finer than ASTM E 112 No. 6 as detemined by using the comparison mehod at 100 percent magnification. Randomly dispersed grains as large a
46、s ASTM E 112 No. 4 are permissible. The components shall be heat treated to refine the grain size and to minimize the presence of Widmanstatten structure in the finished products (see 4.6.10). 3.4.5 Macrostructure. Each finished component shall be free from harmful defects such as seams, voids, flak
47、es, shuts, crach, porosity, nonmetallic inclusions, segregations, and centerline shrinkage (see 4.6.1 1). 3.4.6 Metal sprav hard facinq. The contact bearing surfaces between swivel sections shall be hard faced by the metai spraying process. Ail surfaces to be faced shail be thoroughly prepared by re
48、moval of all foreign material and corrosion products. A coating of a self-fluxing metai powder composed of chromium, boron, nickel, and silicon shall be sprayed onto the prepared surfaces so as to produce a finished coating, after &Sing, of not less than 20-mil (0.5 mm) hiclmess. The sprayed coating
49、 shall be fised to the base metal in accordance with the procedures recommended by the supplier of the hard facing materials. Care shdl be exercised to prevent overheating during the fusing process in order to prevent running or sagging of the coating. The sprayed part shall be cooled slowly in accordance with recommendations of the metal spray supplier. The finished coating shall be fine texture, uniform thickness, free of unatomized or untu
