1、MIL-P-8177Y 13 7779706 0360337 2 W - MIL-P- 81994. (AS) 16 May 1975 MILITARY SPECIFICATION PROPELLANT FOR 20MM AMMUNITION This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 This Specification covers propellant for use in amuni- tion for the 20
2、MM Naval Aircraft Guns, MARK 11 and MARK 12. this document, the word “powder“ is synonymous with “propellant .I As used in 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue of invitation for bids or request for proposal form a part of this speci- fication to the extent specified herei
3、n: in effect on date _I. SPECIFICATIONS Milita2y MIL-D-98 Diphenylamine, Technical MIL-G-155 Graphite, Dry (For Use in Ammunition) MIL-P-193 Potassium Sulfate (For Ordnance Use) MIL-N-244 MIL-E-463 Nitrocellulcpe Ethyl Alcohol (For Ordnance Use) MIL-P-1394 Primer, Electric, M52A3Bl MIL-L-18618 Lead
4、Carbonate, Basic, Dry (For Ordnance Use) MIL-M-19719 Methyl Centralite (For Ammunition Use) Federal O-A-51 Acetone, Technical Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-P-1994 13 7797906 0360340 7 W MIL-P-81994 (AS) STANDARDS Mili t arv MIL
5、-STD-129 MIL-STD-286 DRAWINGS Marking For Shipment and Storage Propellant, Solid: Sampling, Examination and Testing Naval Air Svstems Command DL 517534 Case, Cartridge, 20MM, MARK 5 MOD O DL 2176062-1 Projectile, 20MM, MARK 11 MOD 1 IL 2838594 Gun System, 20MM MARK 12 MOD O apd Supple- mentary Equip
6、ment LD 288379 Packing Box, MARK 7 MOD 3 (For Smokeless Powder) Pod, Gun, MARK 4 MOD O (mm 11 Gun) LD 522056 Department of the Army SK755324 7 Action, Test, Electric, 20MM Assembly, List of Parts and Drawings A7585089 D7259361 Piston, Long Gage, Air Space, 20MM Case D7548066 Primer, Electric, M52A3B
7、1, Assembly Naval Ordnance Systems Command SK6 7 9 8 10 SK6 7 9811 Barrel, Copper Pressure Gauge Test, MARK 100 Series, OMM Ammunition Barrel, Electric Gauge Test, MARK 100 Series, 20MM Ammunition 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
8、-P-1994 33 7979906 0360343 O PUBLICATIONS Naval Ordnance Systems Command NAVORD Instruction 8010.24 Nomenclature on Ammunition Marking of Federal Stock Numbers and (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functio
9、ns should be obtained from the procuring activity or as directed by the con- trac ting officer .) 2.2 Other publications. The following document forms a part of this specification to the extent specified herein. wise indicated, the issue in effect on date of invitation for bids or request for propos
10、al shall apply: Unless other- Code of Federal Regulations 49 CFR 171-190 Hazardous Materials Regulations, Depart- ment of Transportation (Application for copies of Code of Federal Regulations should be addressed to the Superintendent of Dcuments, Government Printing Office, Washington, DC 20402. Ord
11、ers for the above publication should cite “the latest edition and supplements thereto.)“ 3. REQUIREMENTS 3.1 Materials. The materials used in the manufacture of the propellant shall comply with the following: of MIL-N-244, shall be used in the manufacture of all 20MM propellant. 3.1.1 Nitrocellulose
12、. Nitrocellulose, grade C, type I or II 3.1.2 Methyl centralite. Methyl centralite deterrent shall conform to MIL-M-19719, class 2. 3.103 Ethyl alcohol. Ethyl alcohol shall conform to MIL-E-463, grade 2. 3.1.4 or grade IV. Graphite. Graphite shall conform to MIL-G155, grade III 3,105 Potassium sulfa
13、te. Potassium sulfate shall conform to MIL-P-193, type I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P- - MIL-P-1994 13 W 9999906 0360342 2 = I 3.1.6 Diphenylamine. Diphenylamine shall conform to MIL-D-98. 3.1.7 Acetone. Acetone shall confor
14、m to O-A-51, - 3.1.8 Lead carbonate. Lead carbonate shall conform to MIL-L- 18618 . 3.2 Chemical and physical properties. The finished propel- lant shall be graphite glazed. provided as a guide in meeting the other requirements of the specification. They shall be determined as specified in 4.6.1 for
15、 information only. The stability properties of the propellant shall comply with the requirements of table II when determined in accordance with 4.6.1.9. The ch.emica1 properties of table I are TABLE I PROPELLANT CHEMICAL AND PHYSICAL PROPERTIES Nitrocellulose (NC) (nominal) (X) : Diphenylamine (DPA)
16、 (X) : Potassium sulfate (K2SO4) (X) : Lead carbonate (PbC03) (X) : Deterrent - methyl centralite (MC) (X): Coating - graphite (X): Dust and foreign matter (X): Total volatiles (TV) (X): External moisture (A) : Residual solvents (X): Hygroscopicity (%) : 91.4 1.50 (rnax) 5.0 (min) 0.40 (max) 0.075 (
17、max) 2.35 (max) 1.10 (max) 1.75 (max) 0.70 - 1.00 0.60 - 1.00 0.75 - 1.25 TABLE II PROP ELLANT STABILITY PROPERTIES Heat test, stability (OC): 134.5 Time to discoloration (minutes) : 25 (min) Time to explosion (tainutes) : 5 (min) 3.2.1 - Form. with single perforation. The propellant shall be of cyl
18、indrical grain form 3.2.2 Loading. The propellant shall load satisfactorily in loading machines of the type currently in use for the production loading of the appropriate ammunition. 3.2.2.1 Linear compression. The bulk density of the propellant shall be such that the linear compression of the prope
19、llant when subjected to the test of 4.6.1.12.1 shall be not greater than .10 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-1994 13 9999906 0360343 _ 4 3.2.2.2 Weight variation. When subjected to the test of 4.6.1.12.2 the weight of each
20、 of 50 con exceed 69,600 psi (pressure-time (p-t), and the standard deviation shall not exceed 3,000 psi (p-t). 3.3.2.3.2 Muzzle velocity. Excluding the conditioning round, the mean muzzle velocity of the preproduction powder rounds at the assessed charge weight shall be within 50 feet per second (f
21、ps) of the mean muzzle velocity of the master powder rounds in that barrel on that day. standard deviation of the preproduction powder shall not exceed the standard deviation of the master powder by more than 10 fps, The Provided by IHSNot for ResaleNo reproduction or networking permitted without li
22、cense from IHS-,-,-. - MIL-P-81994 13 7399906 0360344 b W 3.3.2.3.3 Action time. The action time (see 6.6.2) for any single round at the assessed charge ;eight -:hall not exceed 0.0033 second (sec). “he mean action time for any group of rounds at the assessed charge weight shall not exceed 0.0030 se
23、c. 3.3.3 Functional tests. Functional tests in the MARK 11 and MARK 12 guns shall be performed as specified in 4.6.2.3. 3.3.3.1 MARK 11. The cyclic rate of the preproduction powder shall be within 150 rpm of the cyclic rate of the master powder in the same gun on the same day when both are fired as
24、specified in 4.6.2.3.1. 3.3.3.2 MARK 12. The cyclic rate of the preproduction powder shall be within 75 rpm of the cyclic rate of the master powder in the same gun on the same day when both are-fired as specified in 4.6.2.3.2. The mean muzzle velocity of the preproduction powder at the assessed char
25、ge weight shall be within 50 fps of the mean muzzle velocity of the master powder in that gun on that day. powder shall not exceed 30 fps. The standard deviation of the preproduction 4 3.4 Production powder assessment. 3.4.1 Charge weight and pressure assessment. The production powder charge weight
26、and pressure assessment firings shall be performed as specified in 4.6.3.1. 3.4.1.1 Charge weight. A charge weight shall be determined as specified in 4.6.3.1.1 to produce a velocity equal to the mean of the two master powder groups in that barrel on that day. 3.4.1.2 Pressure. The assessed pressure
27、 of the powder, calcu- lated as specified in 4.6.3.1.2, shall not exceed 58,000 psi (CU). 3.4.2 Charge weight verification, MARK-11 cyclic rate computa- tions and ballistic requirements. These firings shall be performed as ._- specified in 4.6.3.2. 3.4.2.1 Charge weight .verification. According to t
28、he procedures specified in 4.6.3.2.1, a charge weight shall be determined. weight shall be within five grains of the charge weight assessed in 3.4.1.1. This charge 3.4.2.2 MARK 11 cyclic rate computations. The MARK 11 cyclic rates shall be computed for the master and production powders as specified
29、in 4.6.3.2.2. of the computed rate of the master powder in that barrel on that day. The computed rate of the test powder shall be within 200 rpm Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.2.3 3.4.2.3. Ballistic requiremerits. Maximum chamber
30、 pressure. The mean maximum corrected chamber pressure, computed as specified in 4.6.3.2.3, shall not exceed 69,600 psi (p-t), and the standard deviation shall not exceed 3,000 psi (p-t) . 3.4.2.3.2 Huzzle velocity. Excluding the conditioning round, the mean muzzle velocity of the production powder
31、rounds at the assessed charge weight shall be within 50 fps of the mean muzzle velocity of the master powder rounds in that barrel on that day. of the production powder shall not exceed the standard deviation of the master powder by more than 10 fps. The standard deviation 3.4.2.3.3 Action time. The
32、 action time for any single round at The mean action the assessed charge weight shall not exceed 0.0033 sec. time for any group of rounds at the assessed charge weight shall not exceed 0.0030 sec. 3.4.3 Functional tests. Functional testing shall be performed on the MARK 11 and MARK 12 guns at the di
33、scretion of the procuring activity. 3.4 3.1 MARK 11. The cyclic rate of the production powder shall be within 150 rpm of the cyclic rate of the master powder in that gun on that day when both are fired as specified in 4.6.3.3.1. 3.4.3.2 MARK 12. The cyclic rate of the production powder shall be with
34、in 75 rpm of the cyclic rate of the master powder in that gun on that day when both are fired as specified in 4.6.3.3.2. muzzle velocity of the production powder at the assessed charge weight shall be within 50 fps of the mean muzzle velocity of the master powder in that gun on that day. shall not e
35、xceed 30 fps. The mean The standard deviation of the production powder 3.5 Master powder standardization. 3.5e1 Charge weight and pressure assessment. The master powder charge weight and pressure assessment firings shall be performdd as specified in 4.6.4.1. 3.5.1.1 specified in 4.6.4.1.1 to produce
36、 a velocity of 3,320 fps in a new Mann barrel (see 6.6.3). Charge weight. .A charge weight shall be determined as 3.5.1.2 Pressure. The pressure produced by the assessed charge weight, calculated as specified in 4.6.4.1.2, shall be the assessed pres- sure of the powder and shall not exceed 58,000 ps
37、i (CU). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_I_ MIL-P-1774 13 W 9779706 036034b T W fl MIL-P- 81994 (AS) 3.5.2 Charge weight verification, MARK 11 cyclic rate computa- tions and ballistic requirements. specif2ed in 4.6.4.2. These firings
38、shall be performed as 3.5.2.1 Charge weight verification. According to the proced- ures specified in 4.6.4.2.1, a charge weight shall be determined. This charge weight shall be within five grains of the charge weight assessed in 3.5.1.1. 3.5.2.2 MARK 11 cyclic rate computations. The MARK 11 cyclic r
39、ates shall be computed as specified in 4.6.4.2.2 and shall not differ by more than 150 rpm. 3.5.2.3 Ballistic requirements. 3.5.2.3.1 Maximum chamber pressure. The mean maximum chamber pressure of the assessed charge weight rounds shall not exceed 69,600 psi (p-t), and the standard deviation shall n
40、ot exceed 3,000 psi (p-t). 3.5.2.3.2 Muzzle velocity. Excluding the conditioning round, the mean muzzle velocity of the assessed charge weight rounds shall be - 3,320 - + 50 fps, and the standard deviation shall not exceed 20 fps. 3.5.2.3.3 Action time. The action time for any single round at The me
41、an action the assessed charge weight shall not exceed 0.0033 sec. time for any group of rounds at the assessed charge weight shall not exceed 0.0030 sec. 3.5.3 Functional tests. Functional tests in the MARK 11 and MARK 12 guns shall be performed as specified in 4.6.4.3. 3.5.3.1 MARK 11. A functional
42、 test for cyclic rates shall be Excluding the conditioning burst, each fired as specified in 4.6.4.3.1. rate shall be 4,000 - + 200 rpm. than 150 rpm. 3.5.3.2 The two rates shall not differ by more MARK 12. A functional test for cyclic rates and muzzle Excluding the condi- velocities shall be fired
43、as specified in 4.6.4.3.2. tioning burst, each rate shall be 1,000 + 75 rpm, and the mean muzzle velocity of each burst, excluding the first round, shall be 3,320 - + 50 fps. The standard deviation for each burst shall not exceed 30 fps. 3.6 Test guns (see 4.6.5). Before firing for powder assess- me
44、nt, guns to be used for ballistic measurements shall be broken in by firing a sufficient number of cutting rounds to eliminate erratic ballistics caused by wearing of the barrel. powder shall not be used for experimental powders of nonstandard composition. The first round of all firings for velocity
45、 shall be considered a condition- ing round and be excluded from the data. Guns chosen for acceptance testing of 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
46、 IHS-,-,-MIL-P- $1994. (AS) 4.3 Preproduction inspection. Prior to quantity production, a preproduction sample of 770 pounds of powder shall be prepared and de- livered by the contractor for testing to an agency designated by the pro- curing activity. and processes and at the same location which the
47、 contractor will use for execution of the contract. The preproduction sample shall meet the re- quirements of 3.2 and 3.3 when tested in accordance with 4.6.1 and 4.6.2 or it shall be rejected. The contractor shall be advised of the results of the preproduction inspection, and will be authorized by
48、the procuring activity to proceed with production if the results are acceptable. samples shall become the property of the Government and shall be included in the quantity specified in the contract schedule. sample shall be required when a change in procedures, processes, different location of manufa
49、cture, or a gap of more than 60 days in production occurs. 4.4 Production lot inspection. The production lot shall This powder shall be manufactured by the same procedures Accepted A new preproduction meet the requirements of 3.2 and 3.4 when tested in accordance with 4.6.1 and 4.6.3 or it shall be rejected. - 4.4.1 Production lot. Unless otherwise specified in the con- tract or pu
