1、DOD-A-24581 20 m 7797706 0373154 9 - - DOD-A- 24 5 81 25 October 1978 (see 6.5) MILITARY SPECIFICATION ANCHOR, NAVY STOCKLESS TYPE (METRIC) This specification is approved for use by all interested Commands of the Department of the Navy and the Marine Corps and is available for use by all other Depar
2、tments and Agencies of the Department of Defense. I 1. SCOPE 1.1 Scope. This specification covers nonfouling, Navy stockless type anchors for use on ships. 1.2 Classification. The anchors shall be of the following types, classes, and masses, as specified (see 6.2.1). 1.2.1 Types and classes. Type I
3、- Anchors having a mass between 50 kilograms(kg) (100 pounds (lbs) (and 22,500 kg (45,000 lbs) inclusive) Class 1 - Without a stabilizer Class 2 - With stabilizer Type II - Anchors having a mass of 30,000 kg (60,000 lbs) without stabilizer 1.2.2 Nominal masses. kg (lbs) 50 (100) 100 (200) 150 (300)
4、200 (400) 250 (500) 300 (600) 350 (700) 400 (800) 450 (900) 500 (1,000) 550 (1,100) 650 (1,300) 750 (1,500) 600 (1,200) 700 (1,400) 800 850 900 950 1,000 1,100 1,250 1,500 1,750 2,000 2 , 500 3,000 3,500 4 , O00 4 , 500 5,000 5 , 500 6 , O00 6 , 500 7,250 7,500 8,000 9,000 10,000 11,250 12,500 15 ,
5、O00 17,500 20,000 22,500 30 , O00 (10,000) (11,000) (12,000) (13,000) (14,500) (15,000) (16,000) (18,000) (20.000) i22;5ooj (25,000) (30,000) (35,000) (40,000) (45,000) (60 , 000) 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitation f
6、or bids or request for proposal, form a part of this specification to the extent specified herein. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Ship Engineering Center, SEC 6
7、124, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 2040 /- 9 THIS DOCUMENT CONTAINS I_ PAGES. Provided by IHSNot for ResaleNo reproduction or networking per
8、mitted without license from IHS-,-,-DOD-A-24 581 (NAVY) . SPECIFICATIONS FEDERAL TT-V-51 - Varnish: Asphalt. MIL-C-450 - Coating Compound, Bituminous Solvent Type, Black (For Ammunition). MIL-E-22200/1 - Electrodes, Welding, Fineral Covered, Iron Powder, Low-Hydro- MIL-1-45208 - Inspection System Re
9、quirements. MILITARY gen Medium and High Tensile Steel, As Welded or Stress- Relieved Weld Application. STANDARDS IC MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-248 - Welding and Brazing Procedure and Performance Qualification. MIL-STD-271 - Nondestructive Testing Requirements f
10、or Metals. MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking, and Waterproofing; With Appropriate Test Methods. PUBLICATION MILITARY NAVAL SEA SYSTEMS COMMAND NAVSEA 0900-LP-003-8000 - Metals, Surface Inspection Acceptance Standards. DRAWINGS MILITARY NAVAL SHIP SYSTEMS COY (b) crown pin lug s
11、urface including fillets at junction of lug with crown and (c) crown bearing area that acts as a stop for the shank; (d) shackle pin area and “lower“ bearing surfaces, both on the shank; (e) the shackle at bend and pin hole: (f) and all welds in the anchor assembly. interior of hole for shank: 3.4.2
12、 Acceptance criteria for magnetic particle inspection of castings forgings. 3.4.2.1 Castings. For castings, all linear indications in accordance with NAVCEA 0900- LP-003-8000, that are over 6.35 mm (0.25 inch) in length shall be ground to sound metal and well faired with the surrounding surface. Wel
13、d repair shall not be required if remaining thickness of the original metal equals or exceeds dimensions shown on the drawing (see 3.3). Depth of grinding shall not be greater than 38.1 mm (1.5 inches) except for cracks which shall be removed fully. Castings may be built up to required dipensions by
14、 weld repair. 3.4.2.2 Forgings. Forgings shall comply with class 3 of NAVSEA 0900-LP-003-8000. Indications in excess of class 3 shall be ground to sound netal and well faired with sur- rounding surfaces. 3.4.3 Qualification of welders and welding procedure. Qualification of welders and welding proce
15、dure shall be accomplished in accordance with MIL-STD-248. shall be maqnetic particle inspected after the proof load test in accordance with MIL-CTD-271 All final welds and meet th requirements of NVSEA 0900-LP-003i8000, class 2. 3.4.3.1 Repair welding. Unless otherwise specified (see 6.2.1), defect
16、s in castinqs and forgings may be remved and repaired by weldinq. electrodes in accordance with MIL-E-22200/1. Prior to repair welding, the excavated area shall be fully visible to the welder and allow access of the electrode to all weld surfaces. Weld repairs shall use MIL-7018 4 Provided by IHSNot
17、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-A-Zq5Bl 20 7977706 0373358 b DOD-A- 24 5 81 (NAVY) 3.4.3.1.1 Minor weld repairs. Minor weld repairs may be made to correct surface defects provided that: (a) they do not exceed 25-mm (0.98-in.) depth or 20 percent of
18、 material thickness, (b) a weld buildup for correction of dimensional or machining errors does not whichever is less; exceed the following limitations: (1) 4.76-mm (0.187-in.) maximum buildup for design thickness 25.4 mm (1 inch) an8 uner; (2) 20 percent maximum buildup for design thickness over 25.
19、4 mm (1 inch) but not to exceed 9.52 mm (0.375 in.) unless approved; (3) contouring (such as grinding or machining) for discontinuities shall blend into adjacent material an shall not reduce the thickness of the material below minimum design requirements. 3.4.3.1.2 Nominal weld repairs. Repair welds
20、 in excess of those specified as minor repairs shall be made only with the approval of the Government representative. standards requzeKfthe casting and the area shall be suitably marked to facilitate inspection. Anchors which are repair welded shall be proof load tested afterwards. There shallnoperm
21、anent deformation of any part of the anchor upon completion of this test. when offered for inspection. 3.4.3.2 Repair weld ins ection. Repair welds shall be subjecteo to the same inspection 3.5 Proof load. Anchors shall comply with proof load test requirements of 4.5.3. 3.6 Cleaning. The castings an
22、d forgings shall be cleaned for proper adhesion of finish 3.7 Identification markings. cable drawing (see 3.3). The crown shall be marked in conformance with the appli- 3.8 Finish. Surfaces of all exposed parts shall be coated with one coat of black asphalt varnichconforming to TT-V-51, type I or to
23、 MIL-C-450. 3.9 Stabilizers. 3.9.1 Examination. Stabilizers shall not be subject to any exarinations, tests, analyses, or inspections except those related to weldin? and weldinn procedure (see 3.4.3) and visual and dimensional examination (see 4.4.1). arrived at their deztination and shall conform t
24、o preparation for delivery requirements of section 5. 3.9.2 Shippin . Stabilizers shall not be welded to the anchor assepbly until both have 3.10 Workmanship. The workmanship shall be free from imperfections which may impair appearance or serviceability. 4. QUALITY ASSURANCE PROVISIONS 4.1 Res nsibi
25、lit for ins ection. Unless otherwise specified in the contract, the contractor is?esonsibe-formance of all inspection requirements as specif ied herein. any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Govern
26、ment reserves the rinht to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Certification data/report. The contractor shall prepare certified test reports, inspection da
27、ta, and identification of anchor and attachments, in accordance with the data ordering document included in the contract (see 6.2.2). The report shall contain the state- ment: “Records are available covering heat number of material, processing, heat treatment, chemistry, mechanical properties, magne
28、tic particle inspection, and proof test.“ A copy of certification documents are to be sent to the consignee and the contracting activity or as otherwise specified. system acceptable to the Government for supplies and services covered by this specification. The inspection system shall be in accordanc
29、e with MIL-1-45208 (see 6.2.1). Except as otherwise specified in the contract, the contractor may use his own or 4.1.2 Inspection system. The contractor shall provide and maintain an inspection 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-A-
30、29581 20 799990b 0193357 8 I- Number of anchors in sample WD-A-24 581 (NAVY) 4.2 4.2.1 E. 4.2.1.1 Castings. A lot shall consist of castings made from the same heat. Where material connot be identified by heat, it shall be divided into lots of not more than 500 kg (1,000 lbs.) each, except where a si
31、ngle casting has a mass of more than 500 kg. Samplinq for guality conformance inspection. 4.2.1.2 Forgings. A lot shall consist of material manufactured fror. the same heat. Acceptance number (defectives) 4.2.1.3 Chemical analysis forgings, A lot shall consist of all forgings from the same heat. 301
32、 to 500 501 to 800 801 and over 4.2.1.4 Chemical analysis of castings. A lot shall consist of castings of one class made from the same heat, heat-treated in the same furnace charge, and offered for inspection at one time. 4.2.1.5 Assembled anchor. A lot shall consist of assembled anchors of the same
33、 size offered for inspection at the same time. 4.3 Samplinq for lot acceptance. 50 3 4 5 7 75 110 4.3.1 Samplin for visual and dimnsional examination. Sampling for visual and dimensional examina?ion and lot acceptance criteria shall comply with table II. 3 4.3.2 acceptance 4 TABLE II. Sampling for v
34、isual and dimensional examination - AQL (approx.) = 2.5 percent defective. Number of anchors in Rejection number (defectives) 25 and under 26 to 40 41 to 110 111 to 300 10 15 25 35 O 1 1 2 1 2 2 3 Samplinq for nominal mass. Sampling for nominal criteria shall comply with table III. mass examination
35、and TABLE III. Sampling for nominal mass tests, assembled anchors tolerance - AQL (approx.) = 2.5 percent defective. Number of anchors in 40 and under 41 to 110 111 to 300 301 to 500 501 to 800 801 and over Number of anchors in sample 5 10 15 25 35 50 Acceptance number (defectives) Rejection number
36、(de f ective ) O 1 lot 4.3.3 Sa lin for ma netic article test. Sampling for magnetic particle tests shall be 100 percentyor %Gart: excep: that pins shall be not subjected to this test. 4.3.4 Samplin for chemical analysis castings. Where material cannot be identified by heat, it shall be divided into
37、 lots of not more than 500 kg (1,000 lbs.). shall be obtained from each lot for chemical analysis and these samples shall be analyzed One sample individually. 6 .- 5i . -. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-A- 24 5 81 (NAVY) 4.3.5
38、Sam lin for chemical anal sis forqinqs. Samples for chemical analysis of forgings shall ;e hen applicable, bth prior to and after painting, for defects in manu- facturing and workmanship to verify compliance with this specification. Any anchor con- taining one or more visual or dimensional defects s
39、hall be rejected and if the number of defective anchors in any sample exceeds the acceptable number for that sample, the entire lot represented by the sample shall be rejected. Rejected lots may be offered again for inspection, provided the contractor has removed all nonconforming anchors. Samples s
40、hall again be selected from such rejected lots and re-examined to verify compliance with this specification. curve, free from irregularities. The stop on the shank shall make full surface contact with the boss in the crown when the flukes are in the operatin- position. 4.4.2 Determination of mass. E
41、ach anchor of the sample shall have its mass determined to verify compliance with 3.3. drawing (see 3.3) shall be rejected. If the number of defective anchors in any sample (see table III) exceeds the acceptable number for that sample, the entire lot represented by that sample shall be rejected. con
42、tractor has removed all nonconforming anchors. Samples shall again be selected from such rejected lots and re-examined to verify compliance with this requirement. 4.4.3 Magnetic particle inspection. Any part in the sample containing one or more defects shall be rejected. Rejected lots may be resubmi
43、tted for inspection only after the contractor has examined every anchor part for the type of defect found and has removed all defective parts from the lot. 4.4.1.1 Shank. Radii on the corners of the shanks shall be examined to assure a smooth Anchors exceeding the tolerance limit specified on the Re
44、jected lots may be resubmitted for inspection only after the 4.5 Test procedures. 4.5.1 Chemical tests. Samples selected in accordance with 4.3.4 or 4.3.5 shall be analyzed in accordance with ASTM A 27 or A 668 to insure conformance with chemical composi- tion requirements. The methods shall be corr
45、elated with the National Bureau of Standards standard reference material to insure the validity of the method that is used as a control in chemical methods of analysis or for calibration in instrumental methods of analysis. specification covering method of analysis used shall be noted on certificati
46、on documents (see 4.1.1). The 4.5.2 Mechanical property tests. Tension tests shall be conducted in accordance with ASTM A 370. 4.5.3 Proof load test. 4.5.3.1 General. Each anchor shall be assembled with shackle and pins, ready for service, and shall be subjected in the presence of the Government rep
47、resentative, to the proof load test in both positions as specified on the applicable drawing (see 3.3). The anchors shall be gaged before and after they have been tested in each operative position to determine whether any permanent deformation has been caused by applied stress. 4.5.3.2 Gaging. 4.5.4
48、 Microstructure test. Microstructure examination shall be in accordance with ASTM E 112. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-A-24581 20 = 7777706 01731b1 6 I DOD-A-2 4 5 8 1 (NAVY) 4.5.5 Magnetic particle e. Maqnetic particle examin
49、ation shall be perforned follow- ing completion of proof load testinq and shall be in accordance with MIL-STD-271. 4.6 ment shall be in accordance with the requirements of section 5 and the docuinents specified therein. Inspection g preparation for delivery. Inspection of packing and marking for ship- 5. PREPARATION FOR DELIVERY (The preparation for delivery requirements specified herein shall apply only for direct government contracts. For the extent of applicability of the
