1、. - - _- - - - _. _I- -. _- - - - MIL-C-825418 81 7979906 0287830 T MIL-G-82541B (OS) 21 April 1976 Superseding 23 August 1968 MIL-C-82541A(OS) MILITARY SPECIFICATION CRATE, UNDERNATER MINE MK 56 MOD O GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Sea Systems Command
2、(OS), Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 inspection of the Underwater Mine Crate, MK 56 Mod O, This specificiation establishes the requirements for manufacture and 2, APPLICABLE DOCUMENTS 2.1 The following stand
3、ards and drawings of the issue in effect on the date of invitation forbids form a part of this specification to the extent specified herein: STANDARDS FED-STD-101 Preservation, Packaging, and Packing Materials; test procedures MIL-STD-129 Marking for Shipment and Storage. DRAWINGS, NAVAL SEA SYSTEMS
4、 COMMAND (CODE IDENT. 10001) LD 550108 Crate, Underwater Mine, MK 56 Mod O List of Drawings, Assemblies, Parts, Specifications, etc. (Copies of specifications, standards, and drawings required by the supplier in connection with specific procurement functions should be obtained from the procuring act
5、ivity or as directed by the Contracting Officer). 3. REQUIREMENTS 3.1 General Requirements FSC 8140 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-82541B( OS) 3.1.1 Construction. manufactured in accordance with LD 550108, including all documen
6、ts listed thereon. The Underwater Mine Crate, MK 56. Mod O shall be 3.1.2 Precedence. In the event of conflict between applicable documents, the following order of precedence shall be observed: a. Contract or Purchase Order b. This Specification c. d. Referenced Documents of LD 550108 e. Applicable
7、Drawings of LD 550108 Other Applicable Documents Referenced in 2.1 of this Specification. 3.2 Interchangeability. All parts shall be capable of interchangeable assembly without interferences, binding or misalignment. Section, Aft Support, Butt Plate assemblies and the lifting tubes at both ends of t
8、he base section should be inspected for interchangeability. 3.2.1 Instruments. The supplier shall provide necessary and adequate instruments to ensure that the crate will meet dimensions and requirements shown on the applicable documents listed in LD 550108. Base Section, Top . 3.3 First article. Be
9、fore beginning quantity production under a contract, the supplier shall submit one first-article crate or complete inspection and test, that is prepared for use in the execution of the contract, will be inspected and tested by the Government as specified in 4.3. inspection is for the purpose of dete
10、rmining that the suppliers production methods are capable of yielding items that comply with the technical require- ments of the contract. of the inspections and tests and will issue shipping instructions. If the first article is considered satisfactory, the supplier will be so advised and the manuf
11、acture of crates intended for delivery under the contract may proceed. of this crate, which is not a part of the production quantity. and test shall not be construed as requalification or acceptance of sub- sequent production items. This crate shall be manufactured in accordance with the procedure T
12、he first article The The contracting officer will specify the location . The supplier shall bear the expense of manufacture This inspection 3.4 Performance of first article. all the inspections and tests prescribed in this section. will be given to the materials structural strength, strength of weld
13、ed joints, dimensional accuracy, interchangeability of parts, and general good workmanship. be placed in the crate without binding or misalignment of crate parts, All of the characteristics contained in amlicable drawings of LD 550108 will be The first article will be subjected to Particular attenti
14、on The -Underwater Mine, MK 56, in its several configurations, will confirmed. Permanently distorted members these tests which would prevent the reuse ing, and handling of the Underwater Mine, the first article. and broken welds resulting from of the crate for protection, stack- MK 56, will constitu
15、te rejection of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - MIL-C-82541B l 999790b 0287832 3 9 .I 3.4.1 Vibration (repetitive shock!. The crate in its normal shipping attitude with a dummy load as defined in 3.7 shall withstand the vibra- t
16、ion (repetitive shock) test as specified in 4.6.1 and shall meet the acceptance criteria specified in 4.8. 3.4.2 Pushing and towing. shall be capable of pushing and towing. in 4.6.2 and shall meet the acceptance criteria specified in 4.8 3.4.3 Cornerwise-drop (rotational). The crate with a dummy loa
17、d as defined in 3.7 shall withstand shock loading as induced by a rotational drop on stone, concrete, or steel covered concrete surface on each of the four base corners as specified in paragraph 4.6.3 and shall meet the acceptance criteria specified in 4.8. The crate with a dummy load as defined in
18、3.7 It shall be tested as specified 3.4.4 Four-point hoisting. The four hoisting eyes shall be capable of withstanding a load of five times the gross weight of the crate and the dummy load as defined in 3.7. 4.6.4 and shall meet the acceptance criteria specified in 4.8. It shall be tested as specifi
19、ed in paragraph 3.4.5 Single-point hoisting. standing the gross weight of the crate and the dummy load as defined in 3.7. It shall be tested as specified in 4.6.5 and shall meet the acceptance criteria specified in 4.8, Each hoisting eye shall be capable of with- 3.4.6 Stacking. The crate with a dum
20、my load as defined in 3.7 shall with-. stand a stacking load of five times the gross weight of the crate and dummy load defined in 3.7. It shall be tested as specified in 4.6.6 and meet the acceptance criteria specified in 4.8. 3.4.7 Impact. at a velocity of 10 feet per second, shall withstand impac
21、t on all four vertical faces against a rugged unyielding surface. specified in 4.6.7 and shall meet the acceptance criteria specified in 4.8. The crate with a dummy load as defined in 3.7 when released It shall be tested as 3.5 Performance characteristics of production units. Each crate made in prod
22、uction under the contract will be subjected to the quality conformance inspection of 4.5. confirmed. the test requirements prescribed herein. to the materials structural strength, strength of welde2 joints, dimensional accuracy, inTerchangeability of parts, and general good workmanship. manently dis
23、torted members and broken welds resulting from the test which would prevent the reuse of the crate for protection, Stacking, and handling of the Underwater Mine, MK 56 will constitute rejection of production units. All of the characteristics contained in Table I will be. Particular attention will be
24、 given A sampling of one crate from each lot shall be subjected to Per- 3.5.1 Faur-point hoisting. The four hoisting eyes shall be capable of withstanding a load of three times the gross weight of the crate and the dummy load defined in 3.7. It shall be tested as specified in 4.7.1 and meet the acce
25、ptance criteria specified in 4.8. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-8259LB BL 939730b 0289833 5 m I 3.6 Serial marking. applicable serial numbers (in numerical sequence) to be applied to the identification label on each crate, T
26、he contracting agency or officer will assign the 3.7 Dummy load. an Underwater Mine MK 56 Mod O (mine case, anchor, and explosive section) shall be used, as a service or drill mine (mine case, anchor and explosive section), inert loaded. For test purposes, a dummy load (2026 pounds) simulating Confi
27、guration and weight distribution shall be the same 3.8 Workmanship. Workmanship shall be equal to that required by best commercial practices consistent with quantity production of analogous parts, ensuring also that the dimensions, finishes, and tolerances specified herein and on the applicable draw
28、ings and specifications are satisfied. would deleteriously affect the strength and performance of the crate, and all joints shall be tight and sound. from rough spots, sharp edges and burrs, protrusions, dents or similar defects that might interfere with the assembly of the crates components and loa
29、ding of the crate, interfere with stacking, cause injury to personnel or damage to the contents during loading, handling and shipping. The workmanship on the first article will be the standard of quality which the production items must meet to be acceptable, All components shall be sound and free fr
30、om defects that All surfaces shall be free 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specifie
31、d in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection require- ments specified herein, unless disapproved by the Government. Government reserves the ;.ight to perform any of the inspections set forth in the specification where
32、 such inspections are deemed necessary to ensure that supplies and services conform to prescribed requirements. The 4.2 Classification of inspections. The inspection requirements specified herein are classifed as follows: 4.2.1 First article inspection (see 4.3). 4.2.2 4.2.3 Periodic production insp
33、ection (see 4.4). Quality conformance inspection (see 4.5)* 4.3 First article inspection. The first-article unit that has satisfactorily passed the quality conformance inspection of 4.5 shall be subjected to all the tests of 4.6. Provided by IHSNot for ResaleNo reproduction or networking permitted w
34、ithout license from IHS-,-,-. - MIL-C- 82541B (OS ) 4.4 Periodic production inspection. Units from lots that hav satisfactorily passed the quality conformance inspections of 4.5 shall be selected for periodic production inspection. activity to be designated by the procuring office. of the units shal
35、l be as follows: This inspection will be conducted at an The manner of selectiozi Step 1. After production has begun, select at random one unit from the first lot of 50. with Classification of Characteristics as specified on drawings, the workmanship requirement of 3.8 and the details applicable in
36、LD 550108. If the unit satisfactorily passes this re-examination, proceed to Step 2. The u?it will be re-examined for compliance Step 2. Same as Step 1 for each lot of 200 units. 4.4.1 Defective units. If a unit is detepmined to be defective as a result of the periodic production inspection, accepta
37、nce of the lot shall be with- held, and the contractor shall implement the following: (a) Determine the cause of the defect. (b) Take whatever actions are necessary to correct or eliminate the defect from all units in the lot. (c) Submit -to the procuring activity for its approval the proposed corre
38、ctive action for preventing re-occurrence of the defect. (d) If at Step 2, return to Step 1 again and conform with its requirements. 4.5 Quality conformance inspection. 4.5.1 in 3.7. Each crate shall be inspected to ensure fit of dummy load defined 4.5.2 in LD 550108 and Classification of Characteri
39、stics as specified on drawings. Each crate shall be examined for compliance with details applicable 4.5.3 Each crate shall be examined for workmanship in conformance with 3.8. 4.6 First-article tests. The crate, complete with dummy load installed as specified in 3.7, shall be subjected to the follow
40、ing tests at ambient temperature. 4.6.1 Vibration (repetitive shock) test. the loaded crate in accordance with Method 5019 of FED-STD-101. It shall be tested with the base down in normal shipping position. The mine mate shall meet the requirements of 3.4.1. The following clarifications are applicabl
41、e: This test shall be conducted on The test period shall be two hours. (a) If circular input motion is used, table frequency shall be adjusted to ensure that one edge of the container leaves the table on each cycle b) 3/16 inch. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted
42、without license from IHS-,-,-MIL-C-82541B 81 979970b 0289835 7 MIL-C-82541B (OS) (b) If vertical linear motion is used, all points of the container shall leave the table by 1/16 inch at the same instant during each cycle. (c) If neither (a) norb) above Is realizable with the equipment at hand, the t
43、able shall be operated at 270 i. 2 rpm. 4.6.2 Pushing and towing test. This test shall be conducted on a hard dry pavement in accordance with Test Method 5011 of FED-STD-101, paragraph 6.5 and 6.6. The mine crate shall meet the requirements of 3.4.2. 4.6.3 Cornerwise-drop test (rotational). This tes
44、t shall be conducted on the loaded crate in accordance with Method 5005 of FEDpSTD-101. heights shall be 18 inches cm the four bottom corners of the crate only. The mine crate shall meet the requirements of 3.4.3. The drop . 4.6.4 Four-point hoisting test. A suitable equal four-legged sling with saf
45、ety hooks shall be attached to the four lifting eyes on the bottom section of the loaded crate. placed on top of the crate with the dummy mine installed in the crate and the entire load shall be lifted free of the floor and suspended from the sling for five minutes. A load of weights of 8800 pounds
46、shall be The mine crate shall meet the requirements of 3.4.4. 4.6.5 Single-point hoisting test. A suitable sling with a safety hook shall be attached to one of the lifting eyes on the bottom section of a crate and dummy mine. Each lifting eye shall be capable of lifting the total gross weight by sin
47、gle suspension free of the floor for five minutes. The mine crate shall meet the requirements of 3.4.5. 4.6.6 Stacking test. A load of 11,000 pounds shall be placed on top of the crate containing the dummy load. The load should be distributed and bear on the test crate so as to simulate loaded crate
48、s in a superimposed stack. The mhe crate shall meet the requirements of 3.4.6. 4.6.7 Impact test. be used. One impact shall be made on each end and side of the crate while suspended from a four-legged sling. The mine crate shall meet the requirements of 3.4.7. Pendulum impact test, Method 5012 of FE
49、D-STD-101, shall The vertical drop shall be 18.6 inches. 4.7 Production unit test. 4.7.1 Four point hoisting test. safety hooks shall be attached to the four lifting eyes on the bottom section of the loaded crate. of the crate with the dummy mine installed in the crate and the entire load shall be lifted free of the floor and suspended by the sling for five minutes. A suitable equal four-legged sling with A load of 4400 pounds shall be placed on top The mine crate shal
