1、NIL-G-85258 23 7777906 03b4202 b m- /-. _a- -i_- .=- MILLG-85258 (AS) 13 June 1981 MILITARY SPECIFICATION GENERATOR, GAS PRESSURE, PROPELLANT ACTUATED BBU-l8/B This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments
2、 and Agencies of the Department of Defense. 1. SCOPE. 1.1 Scope. This specification establishes the requirements for manu- facture and acceptance of the Propellant Actuated Gas Pressure Generator, BBU-l8/B, critical item, referred to herein as the generator. 2. APPLICABLE DOCUMENTS. 2.1 Issues of do
3、cuments. The following documents 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 MI LI TAY MIL-B-8525 1 Bomb, Binary Chemical, BLU-80/B. Beneficial comments (recommendations, additions, del
4、etions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Air Engineering Center, Engineering Specif icatons and Standards Department (ESSD) , Code 93, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Impr
5、ovement Proposal (DD Form 1426) appearing at the end of this document, or by letter. dr U.S. GOVERNMENT PRINTING OFFICE 1981-703-023/4560 m il IFSCI Licensed by Information Handling ServicesMIL-G-525 13 m 7777706 0364203 II MIL-G-85258 (AS) STANDARDS FEDERAL FED-STD- 102 MILITMY MIL-STD- 109 MIL-STD
6、-129 MIL-STD-414 MIL-STD-453 MIL-STD-810 MIL-STD-45662 DRAWINGS Naval Air Systems Command (Code Ident 30003) DL X4900537 DL X4900553 X49 O 05 8 3 SA495 i92 SA2875556 Preservation, Packaging and Packing Levels. Quality Assurance Terms and Definitions. Marking for Shipment and Storage, Sampling Proced
7、ures and Tables for Inspection by Variables. Radiographic Inspection. Environmental Test Methods. Calibration System Requirements. Generator, Gas Pressure, Propellant Actuated BBU-l8/B. Propellant Cartridge, CCU-15/B. Disk, Solid, Plain. Assembly, Adapter, Static Firing, Gas Generator. Fixture, Vibr
8、ation (MAU-l32A/B, BBU-lS/B). (Copies of specifications, standards, drawings, and publications required by contractors in connection with specified procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2 Licensed by Information Handling Serv
9、icesMIL-G-85258 13 m 9999906 036Y204 T m 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. DEPARTMENT OF TRANSPORTATION
10、Code of Federal Regulations 49 CFR 171-178 Transportation. (Application for copies should be addressed to the Superintendent of Documents, Government Printing Off ice, Washington, D. C. 20402. ) American Society for Testing and Materials ASTM F-78-71 ASTM E-493-73 Standard Method of Calibration of H
11、elium Leak Detectors by use of Secondary Standards. Leaks Using the Mass Spectrometer Leak Detector in the Inside-out Testing Mode, Methods of Test for. (Application for copies should be addressed to the American Society for Testing and materials, 1916 Race Street, Philadelphia, PA 19103.) 3. REQUIR
12、EMENTS. 3.1 Item description. The generator is an ammonium nitrate solid pro- pellant device, which, when electrically initiated, produces gas suitably clean and cool to drive MAU-l32A/B Hot Gas Motor. of the generator are a head assembly, propellant assembly, retainer, and igniter. The major compon
13、ents 3.2 Characteristics. 3.2.1 Performance. 3.2.1.1 Prefunctional. 3.2.1.1.1 Mechanical integrity. The generator shall exhibit no evi- dence of loose parts du to separation of the propellant grain assembly from the canister. voids, or low density areas. The propellant grain shall be free of breaks,
14、 cracks, 3 Licensed by Information Handling ServicesMIL-G-85258 13 I 777770b 03b11205 L MIL-G-8525 8 (AS) 3.2.1.1.2 Electrical resistance. The generator ignition circuit shall have a resistance of 1.00 20.15 ohms. 3.2.1.1.3 Airtightness (leak rate). The generator shall have a leak rate less than 1.0
15、 x atmospheric cubic centimeter per second (atm om3/,) at 1 atmosphere differential pressure and 25 22 degrees Celsius (OC). 3.2.1.2 Functional. When assembled and static fired, the generator shall function without ignition failure or blowing up and produce a pressure-time curve with values meeting
16、the requirements of Table I. TABLE I. Functional reauirements. Perf ormance character i s t ics Ignition delay, ms Time-to-900 lb/ in2g , ms Early maximum pressure, lblinzg Minimum pressure, lb/ in2, Late maximum pressure, lb/in2g Brrrning time, s spe c if i c a t i on i imi t $1 -48OC I +74oc Min M
17、ax 20 750 1 , 900 I- -I - 800 - - 1,500 - - Min I Max l/performance characteristics definitions of 6.3 shall apply. 2/These values are subjected to revision upon completion of testing, 4 Licensed by Information Handling ServicesMIL-G-85258 13 9999906 03b9206 3 3.2.2 Environmental. The generator perf
18、ormance shall not be degraded below that specified in Table I after exposure to the following environments. 3.2.2.1 Temperature shock. Alternate sequential exposure to temper- atures of -48 and 74OC. 3.2.2.2 Vibration. Exposure to the vibration schedule specified in Figure 1 in each of three mutuall
19、y perpendicular axes under the environ- mental conditions stated in 4.5.2.2. 3.2.2.3 High temperature. Exposure to a temperature of 74OC for a minimum of 30 consecutive days under the environmental conditions stated in 4.5.2.1. 3.2.2.4 Mechanical shock. Exposure to half sine wave impact shocks havin
20、g a peak amplitude of 15 gravity units (8) and a total duration of 11 milliseconds (as) at a temperature of -48OC under the environmental conditions stated in 4.5.2.4. 3.3 Design and construction. 3.3.1 Production drawings. The generator shall be fabricated and assembled in accordance with the drawi
21、ngs, parts list, and other docu- ments listed on DL X4900537, DL X4900553, and this specification. 3.3.2 Standards of manufacture. 3.3.2.1 Working environement. Special working environments for the manufacture of propellant and assembly of generator shall be as speci- fied in MIL-B-85251 and 3.3.2.2
22、. 3.3.2.2 In process handling and storage, All binder, propellant, inhibitor, inhibited propellant, and generator shall be processed and stored in an environmentally controlled area with a relative humidity not greater than 40 percent and a temperature not greater than 32OC. 3.3.2.3 Manufacturing pr
23、ocesses and procedures. When specified in the contract or purchase order (see 6.2.2), the contractor shall pre- pare, in his own format, written procedures covering detailed equipment, process requirements, and procedures used by the contractor in the 5 Licensed by Information Handling ServicesMIL-G
24、-8525 13 W 7777706 03611207 5 Ml e.02 8 11/0&TAVE 11.13 g RMS - - = &01r 0 .I .I - 0.m 4- u1 8.005 : - - I I I I I I I I I I I I ill1 I 1 I I iiil ad * w c) I - c) . Assembly adapter, static firing (see Figure 3, Draw- ing SA495192). 4.4.1.1 Calibration and maintenance. Unless otherwise specified in
25、 the contract or purchase order ,(see 6.2.1) , calibration system require- ments shall conform to MIL-STD-45662. 4.4.2 Automatic recording equipment. Continuous recording equipment having at least the following accuracies (including reading resolution) shall be used in obtaining data during those pa
26、rts of the generator tests requiring evaluation of time versus performance: a. True pressure to within 220 pounds per square inch gage (lb/in2g). b. True ignition delay and true time to 900 lb/in2g to within +20 ms. c. True burning time to within 50.5 s. 4.5 Test methods. 4.5.1 Prefunctional. Each g
27、enerator of the entire inspection lot shall be subjected to the following prefunctional tests. 4.5.1.1 Visual examination. Each generator shall be visually in- spected for conformance to the requirements of 3.3. 4.5.1.2 Electrical resistance. Electrical resistance tests shall be conducted by removin
28、g the shorting clip from the igniter and measuring the resistance between the firing pin and the igniter body. After meas- uring, replace the shorting clip. measure electrical resistance shall determine true resistance to within 20.02 ohm. Accuracy of the equipment used to 15 Licensed by Information
29、 Handling Services_ MIL-G-85258 13 m 7777706 0364237 = MIL-G-85 25 8 (AS) PR ESSU R E AT TRANSDUCE R TACHES HERE - (1/8 1 .P.T.) / ORIFICE FIGURE 3. Gage adapter, static firing, gas generator. (See Drawing SA495192). 16 Licensed by Information Handling ServicesL MIL-G-85258 13 06 036L1218 T IT WARNI
30、NG For safety reasons, the test equipment should not subject the igniters elec- trical circuit to a current exceeding 50 milliamperes (ma). 4.5.1.2.1 Acceptance criteria, Any generator having an electrical resistance outside the limits given in 3.2.1.1.2 is defective. tive gas generators found durin
31、g Group I tests shall be removed from the lot and rejected. shall cause rejection of the lot represented. Defec- Defective generators found during Group II tests 4.5.1.3 Airtightness. Airtightness testing shall be conducted by operators certified for helium leak testing. be calibrated in accordance
32、with ASTM F-78 by a helium leak standard before and after a given lot or every 4 hours, whichever occurs first. Testing shall be conducted in accordance with ASTM-E-493, Method A, except that Method B may be utilized for Group I testing if testing is conducted within 4 hours of final assembly in acc
33、ordance with DL X4900537. The leak detector shall The following information shall be recorded: a. Part number. b. Lot number. c. Serial number. d. Date test performed. e. Leak rate, 4.5.1.3.1 Acceptance criteria. The generatar shall meet the require- ments of 3.2.1.1.3. 3.2.1.1.3 are defective. shal
34、l be removed from the lot and rejected. during Group II tests shall cause rejection of the lot represented. Generators which fail to meet the requirements of Defective generators found during Group I tests Defective generators found IT Licensed by Information Handling Services MIL-G-85258 13 777770b
35、 0364217 1 = MIL-G-85258 (AS) 4.5.1.4 Mechanical integrity. The generator shall be turned upside down and radiographically inspected in accordance with MIL-STD-453 to determine compliance with 3.2.1.1.1. 4.5.1.4.1 Acceptance criteria. The generators shall meet the re- quirements of 3.2.1.1.1 to be a
36、cceptable. Generators which fail to meet the requirement of 3.2.1.1.3 during Group I tests shall be removed from the lot and rejected. Generators which fail to meet the requirement of 3.2.1.1.1 during Group II tests shall cause rejection of the lot represented. 4.5.2 Environmental tests. The followi
37、ng environmental tests shall be performed in the sequence shown in Table II for preproduction samples and Table III for quality conformance samples. Visual examinations and electrical resistance tests performed subsequeat to environmental test- ing as shown in Table II or III shall be considered acc
38、eptance criteria. 4.5.2.1 High temperature. All generators of the sample shall be stored for not less than 30 consecutive days in a temperature condition- ing chamber maintained at an internal temperature of 74 23OC. 4.5.2.2 Vibration (random). The testing shall be in accordance with MIL-STD-810, Me
39、thod 514. Time of testing shall be 120 minutes in each of the three major orthogonal axes. 90 minutes per axis at low temperatures of -40 +3OC and 30 minutes per axis at high temperatures of 60 +3OC. The test time shall be divided into a. Temperature stabilization shall be in accordance with general
40、 requirements of MIL-STD-810. b. The vibration test profile shall be in accordance with the vibration schedule of Figure 1. c. The tolerance on vibration test levels and test conduct shall be in accordance with MIL-STD-810, Method 514.2, paragraph 4.5.2, “Random Vibration Test.“ d. Drawing SA2875556
41、 shall be used as the vibration fixture. 18 Licensed by Information Handling Servicesb 4.5.2.3 Temperature-shock cycling. Temperature-shock cycling shall be conducted as follows: a. Place the generators in a temperature-conditioning chamber maintained at 74 23OC. NOTE: temperature-conditioning chamb
42、ers need not be controlled during this test. The relative humidity of the b. After the generators have been in the temperature- conditioning chambers for a minimum of 4 hours (6 hours maximum), place the gas generators in a chamber maintained at -48 +3OC. Effect a complete interchange in less than 5
43、 minutes. After the generators have been held in the new temperature environments for a period of 4 hours (6 hours maximum), again interchange the contents of the two cham- bers. extreme (a total of 8 to 12 hours) constitutes one complete cycle. Four to 6 hours of temperature-conditioning at each c.
44、 Perform 10 cycles of thermal-shock treatment. d. Bring all generators back to ambient temperature. 4.5.2.4 Mechanical shock. Testing shall be in accordance with MIL- STD-810, Method 516.2, Procedure I, with the modifications and additions herein. direction through three mutually perpendicular princ
45、iple axes at a temper- ature of -48 f3OC. Testing shall be conducted by applying three shocks in each a. The shock pulse signature shall be a half sine pulse, 15 g peak and 11 ms duration. The shock pulse tolerance limits shall be in accordance with MIL-STD-810, Method 516.2, Figure 516.2-2, “Half S
46、ine Shock Pulse Configuration and its Tolerance Limits.“ 19 Licensed by Information Handling Servicesb. Before applying mechanical shocks, the generators shall be temperature conditioned at -48 -OC for not less than 4 hours. If the generators must be removed from the chamber to apply the required sh
47、ocks, the elapsed time between removal from the chamber and the start of application of any shock along any axis shall not exceed 3 minutes. If the generators are transferred from the temperature-conditioning chamber to a temperature-conditioned insulated box which is at the same temperature, the el
48、apsed time between removal from the chamber and start of application of any shock along any axis may be increased to 5 minutes, provided the generators are not exposed to ambient temperature for more than 3 minutes of the 5 minute period. If shock testing is not completed within the time limits spec
49、ified, the generators shall be returned to the conditioning chamber for not less than 1 hour before shock tests are resumed. 4.5.3 Static-firinn tests. Prior to firing the generators, install the generator aozzle exhaust fitting (Figure 3) and any necessary static firing fixtures. Fill pressure transducer and associated tubing with DC-11 silicone compound or equivalent grease to prevent variations in generator free volume. Temperature condi- tion the generators in appropriate temperature chambers for no less than 4 hours prior to firing. Units to be f
