1、MIL-P-48231 (MU) 2 August i973 SUPERSEDING See Section 6.9 MILITARY SPECIFICATION PROPELLANT M6 FOR USE IN CARTRIDGE, 105MM APERS-T, M494 1. SCOPE 1.1 This specification covers M6 Propellant for use in the M494 Cartridge employed with the 105MM, M68 Gun. 2. APPLICABLE DOCUMENTS 2.1 The following doc
2、uments of the issue in effect on date of invitation for bids, or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-A-2550 - Ammunition and Special Weapons; General Specification for STANDARDS MILITARY MIL-STD-109 MIL-STD-652 MIL-STD-1
3、168 - Lot Numbering of Ammunition MIL-STD-1171 - Acceptance and Description Sheets for MIL-STD-414 - Quality Assurance Terms and Definitions - Propellants Solid for Cannons Require- ments and Packing Propellants and Explosives Inspection by Variables for Percent Defective - Sampling Procedures and T
4、ables for A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-48231 13 = 779990h 03176115 3 MIL-P-48231 (MU) a chamber pressure greater than 47,000
5、psi at any operating temperature (-5OOF to 4-145OF) when fired in a standard weapon. 3.3 Workmanship. The best commercial practices shall be used in the formulation of propellant furnished under this specification, and all other applicable documents. The propellant and its standard ingredients shall
6、 be protected from the action of direct sunlight and acid fumes. No reground propellant or nitrocellulose shall be used in the manufacturer of propellant procured under this specification unless otherwise specified. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise
7、specified in the contract or purchase order, the supplier is responsible for the performance of all inpsection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection
8、 requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the fnspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Reference shall be
9、made to MIL-STD-109, in order to define terms used herein. The provisions of MIL-A-2550 shall apply. 4.1.1 Submission of product. At the time the completed lot of product is submitted to the Government for acceptance, the contractor shall supply the following information accompanied by a certificate
10、 which attests that the information provided is correct and applicable to the product being submitted : the quality assurance provisions specified within this specification. made available upon request by the contracting officer). inspections performed (shall be made available upon request by the co
11、ntracting officer). with an identification and date of changes. a. A statement that the lot complies with all of b. Number of batches of product inspected (shall be c. Results obtained, by defect code, for all d. Drawing, specification number, and date, together 3 .- -, . - .- - -. . Provided by IHS
12、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIbP-4.8231 (MU) e. Certificates of conformance on all material purchased by the contractor when such material is controlled by Government or commercial specifications referenced in any of the contracting documents (s
13、hall be made available upon request by the contracting officer). f. Number of items in the lot. g. Date submitted. h. Eight copies of propellant description sheet SMU Form 1060 containing the applicable data (see 6.8) 4.1.2 The certificate shall be signed by a responsible agent of the certifying org
14、anization, submitted shall be substantiated by evidence of the agents authority to bind his principal. authority will not be required with subsequent certificates unless, during the course of the contract, this authority is vested in another agent of the certifying organization. The initial certific
15、ate Substantiation of the agents 4.2 Inspection provisions 4.2.1 Lot formation. The term as used throughout, this specification, refers to an inspection lot, which is defined as an essentially homogeneous quantity of propellant from which the sample was drawn and shall not be construed to represent
16、any prior or subsequent quantities presented for inspection. A lot shall consist of one or more sub-lots or one or more batches of M6 propellant produced by one manufacturer, in accordance with the same specification and same specification revision, under one continuous set of operating conditions.
17、Each lot shall consist of that quantity of M6 propellant which has been subjected to the same unit chemical or physical process intended to make the final product homogeneous. 42.2 Testing 4.2.2.1 Materials (see 3.1). Each lot of propellant shall be sampled and tested for composition, form, dimensio
18、ns and chemical-physical properties in accordance with MIL-STD-652. 4.2.2.2 Proving ground (see 3.2). Each lot of propellant shall be sampled for proving ground tests in accordance with MIL-STD-652. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4
19、.2.2.2.1 Assessment (see 3.2.1). Major defect, Code No. 01001 (see 6.4). The lot shall be rejected if the assessed charge weight of propellant has an expected pressure greater than 39,000 psi. 4.2.2.2.2 Velocity uniformity. (TOOF) (See 3.2.2) Major defect, Code No. 0200l. If the product of the facto
20、r (see 6.5) times the velocity standard deviation of the rounds tested in accordance with 4.3.3 exceeds the applicable requirement the lot shall be rejected. For initial production lots a ten round sample shall be tested (see 6.6) 4.2.2.2.3 Individual pressure (see 3.2.3) 4.2.2.2.3.1 Initial product
21、ion 4.2.2.2.3.1.1 Permissible individual maximum pressure. If any individual pressure observed during uniformity firings at any operating temperature (-50F to ti45OF) after correction for difference between as fired and recommended service charge weight exceeds 47,000 psi, the lot shall be rejected.
22、 4.2.2.2.3.2 Subsequent production 70F. If any individual pressures observed during the 7OoF uniformity series when corrected to standard conditions and recommended charge weight exceeds 47,000 minus 75 times the pressure temperature coefficient established duringInitia1 Production Testing, the lot
23、shall be tested at t145OF in accordance with 4.3.3.1.1. 4.3 Test methods and procedures 4.3.1 Proving ground tests. These tests shall be conducted at a Government proving ground (designated by the contracting officer) in accordance with the applicable Proving Ground Acceptance Test Procedure. 4.3.2
24、Charge assessment 4.3.2.1 Charge slope method. Three or more groups of rounds loaded with selected charge weights of propellant (weights selected should bracket expected service charge weight) shall be conditioned and fired at 7O0F. From the data obtained, a charge weight shall be calculated which 5
25、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSL-F-48231 (MU) will yield the prescribed service velocity. charge weight shall then be loaded into rounds for the uniformity series (see 4.3.3). The difference between the corrected velocity obtained
26、 during the uniformity series and the service velocity shall be compensated for by a final adjustment in charge weight using the slope of the velocity- charge weight curve previously established. This calculated 4.3.2.2 Constant slope method. After ten(l0) lots of a given production series have been
27、 fired to provide a good knowledge of the propellant characteristics, the charge slope method of assessment may be discontinued and the charge wetght determined by the constant-slope method. A composite .velocity versus charge weight versus pressure curve can be established from test results generat
28、ed. This curve can then be used as in 4.3.2.1 above to calculate the charge weight needed to achieve service velocity. This calculated charge weight is then to be loaded into rounds for the uniformity series and final adjustment is to be made as indicated above for the charge slope method. 4.3.3 Uni
29、formity series 4.3.3.1 Initial production 4.3.3.1.1 1450Fe Ten rounds of M494 Cartridges shall be assembled with the assessed charge of propellant, conditioned to 145OF (as indicated by a thermocoupled control round (rnd) and fired alternately with c-alibration rounds. The velocity and pressure mean
30、s as well as the standard deviations associated with these parameters shall be calculated. All results shall be corrected to recommended charge weight conditions (i.e. difference between as fired charge weight and recommended charge weight). (see 6.10) 4.3.3.1.2 7O0F. Ten rounds of M494 Cartridges s
31、hall be assembled with the assessed charge of propellant, conditioned to 7O0F (as indicated by thermocoupled control rnd) and fired alternately with calibration rounds. The velocity and pressure means, as well as the standard deviations associated with these parameters shall be calculated. All resul
32、ts shall be corrected to standard shell weight (31.0 lbs) and standard weapon/firing conditions (i.e. the difference between calibration performance under test conditions and standard conditions) and to recommended charge weight conditions . r b Provided by IHSNot for ResaleNo reproduction or networ
33、king permitted without license from IHS-,-,-MIL-P-482-31 (MU) 4.3.3.1.3 -SOOF. Ten rounds of M494 Cartridges shall be assembled with the assessed charge of propellant, conditioned to -SOOF (as indicated by a thermocoupled control rnd) and fired alternately with calibration rounds. The velocity and p
34、ressure means as well as the standard deviations associated with these parameters shall be calculated. All results shall be corrected to recornended charge weight conditions (i.e. difference between as fired charge weight and recommended charge weight). 4.3.3.2 Subsequent production. Seven rounds of
35、 Cartridges shall be assembled and tested at 70F while 145OF and -SOOF testing shall be omitted entirely. pressure means as well as the standard deviations associated with these parameters shall be calculated. All results at- 70F shall be corrected to standard shell weight (31.0 lbs) and standard we
36、apon/firing conditions and recommended charge weight conditions (see 4.2.2.2.3.2). 4.3.4 Refiring. If for any reason the proving ground considers that test conditions have detrimentally affected the test result, additional charges as required shall be tesee. The velocity and 5. PREPARATION FOR DELIV
37、ERY 5.1 Packing and marking. Packing and marking shall be 6. NOTES in accordance with MIL-STD-652. 6.1 Ordering data. Procurement documents should specify a. Title, number and date of this specification. b. Packing required (see 5.1) C. Process. Details of the manufacturing process the following: an
38、d the equipment used by the Contractor will be submitted to the procuring activity in writing prior to commencement of manufacture. 6.2 Standard deviation. The standard deviation shall be calculated with (n-i) as the devisor in a standard statistical technique equivalent to that shown in MIL-STD-414
39、, Section B, Example B-l. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-48231 (MU) 6.3 Submission of test data. In addition to the normal distribution of records, when the propellant is procured by the Department of the Army, one copy of all
40、ballistic test data shall be forwarded to: Commander, Picatinny Arsenal, ATTN: SARPA-._. . . y z- , . ., _ 1 -. - . . _. . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-48231 (MU) 6.11 Test cartridges shall be assembled in accordance with t
41、he following drawing: 9229962 - Cartridge, 105MM, APERS-T, MO94 6.2 Proving Ground test summary INITIAL PRODUCTION Temp Sample Vel(fps) Lot Std. Perm. Ind. Avg. Pres. (OF) Size (assessed) Dev. of Vel. Max. Pres. Max (fPS) (Psi) (Psi) -50 10 N/A NIA 47,000 NIA 70 10 2700 10.0 47,000 39 000 14 5 10 NI
42、A NIA 47,000 N/A SUBSEQUENT PRODUCTION 70 7 2700 10 .o 47,000 39 000 1459 10 N/A N/A 47,000 N/A *To be fired only when 7O0P results indicate that marginal pressure performance may exist Custodian: Preparing Activity: (see 4.2.2.2.3.2) ARMY-MU ARMY-MU Project Number: 1375-A-037 9 Y% U. S. GOVERNMENT PRINTING OFFICE: 1973 -71% 147/1794 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
