1、Licensed by Information Handling Services3. REQUIREMENTS 3.1 Classification of requirements. The requirements for the pump are classified as follows: REQUIREMENTS PARAGRAPH General Requirement s 3.2 Performance Requirements and Product Characteristics 3.3 Environmental Requirements 3.4 Operational S
2、ervice Life 3.5 T 3.2 General requirements. 3.2.1 Data requirements. No data is required by this specification or approval documents referenced in Section 2 unless specified in Con- tract or purchase order. See 6.2. 3.2.2 Preproduction sample. Unless otherwise specified in the con- tract or purchase
3、 order, the preproduction sample of the pump shall be manufactured using the methods and prcedures proposed for production. The sample will be tested as specified in Section 4 herein and is for-the purpose of determining that prior to starting production; the contractors production methods are capab
4、le of yielding items that comply with the technical requirements of the contract. 3.2.3 Materials. Unless otherwise specified in the contract or purchase order,all materials and treatments of materials and parts used in the manufacture of the pump shall be in accordance. with the applicable document
5、s listed on BuWeps DL 1568923. 3.2.4 Definitions. Definitions of terms appear in Section 6. 3.3 Performance requirements and product characteristics. Un- less specified otherwise, the pumps shall satisfy the following performance -_ requirements when tested as specified in Section 4. 2 Licensed by I
6、nformation Handling ServicesME-P-824.42 (OS) 3.3.1 Pressure and flow requirements. The pump shall provide a discharge at a flow rate of 8.3 gallons per minute (gpm) minimum, at a pressure of 265 pounds per square inch gage (psig) minimum when operated at 3880 f 10 revolutions per minute (rpm), with
7、an inlet pressure of 15 psig. 3.3.2 Static case pressure. The pump shall be capable of with- standing internal pressures of 1250 psig minimum without leakage. 3.3.3 The pump shall be capable of pumping fresh water or a salt solution (6.3.9) at temperatures between +32“ F and +98“ F. Fluid. 3.3.4 Dut
8、y cycle. The pump shall be capable of operation-for 10 duty cycles of 7 minutes each, at rated discharges as specified in 3.3.1 3.4 Environmental requirements. Unless otherwise specified, the pump shall be capable of conforming to the performance requirements and product characteristics of the speci
9、fication after being exposed.to the environmental conditions specified in this section. For definitions of ready, operating, and non-operating see 6.3.1, 6.3.2, and 6.3.3. 3.4.1 Vibration, ready condition. The pump, mounted as shown in Figure 1, shall be capable of meeting the performance requiremen
10、ts after being subjected, in the ready condition, to the vibrations defined in Table I. The pump shall be vibrated for 180 minutes each in its longi- tudinal axis and in two mutually perpendicular transverse axes at any temperature within the range of -45“ F to +140“ F. in 6.3.4. Vibration is define
11、d 1 TABLE I VIBRATION SCHEDULE Double Amplitude Acceleration Frequency (in. _C 10%) Minimum (gs f 10%) Minimum (cps) o. 2 O. 036 - 1 - 5 - 22 22 - 40 40 - 74 74 - 500 Licensed by Information Handling Services- Peak Di;rc?:I:ion Of Number Test Magnitude Duration Impact Deceleration Of Sequence (as t:
12、 10%) (ms Axis Force Impacts 1 300 0.5 to 1.5 Longitudinal Aft 3 2 85 0.5 to 1.5 Transverse A Optional 3 3 85 0.5 to 1.5 Transverse B Optional 3 4 45 18.0 to 20.0 Longitudinal Fwd 3 5 60 8.0 to 10.0 Longitudinal Aft 3 6 60 8.0 to 10.0 Longitudinal Fwd 3 7 60 8.0 to 10.0 Transverse A Optional 3 8 60
13、8.0 to 10.0 Transverse B Optional 3 Licensed by Information Handling ServicesMIL-P-829q2 I3 U 7777906 03b0896 I m MIL-P-824.42 (OS) 3.4.4-1 Non-operating. - a. Temperature. The pump shall be capable of meeting the performance requirements subsequent to withstanding, in the non-operating condition, e
14、nvironmental tempera- tures between -45“ F and +140“ F. fined in 6.3.7. Temperature is de- - b. Humidity. The pump shall be capable of meeting the performance requirements subsequent to withstanding, in the non-operating condition, an environment of at least 95 percent relative humidity at 3-110“ F
15、for a minimum period of 8 hours. Humidity is defined in 6.3.8. 3.4.4.2 Ready, operating. The pump immediately after being condi- tioned for 1 hour at any temperature between O“ F and +140“ F shall be capable of meeting the performance requirements, using a salt solution, at any temperature between +
16、32“F and +98“ F. 3.5 Operational service life. The pump shall have a minimum service life of 70 minutes which shall be divided into 10 duty cycles of 7 minutes each. 3.6 Workmanship. The workmanship and finish shall be of sufficiently high grade to insure satisfactory operation consistent with the r
17、equirements of this specification. The assembly shall be thoroughly clean and free of excess materials, chips, and loose or spattered foreign materials. The standards of workmanship exhibited in any approved pre- production sample, subject to any qualification stated in the Govern- mentss notice of
18、approval, shall be determinative of the requirements of the contract relative to workmanship insofar as not specifically covered by applicable specifications. 4* QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier
19、 is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth
20、in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Licensed by Information Handling ServicesPlIL-P-Zq42 13 7977706 0360897 3 MIL-P-82442 (OS) d 4.2 Classification of inspection, Inspection of the pump shall be classifi
21、ed as follows: - a. Preproduction inspection (Subsection 4.4) . b. Acceptance inspection (Subsection 4.5) - c. Periodic inspection (Subsection 4.6) - d. Examination of first echelon repair parts (Subsection 4.7) - 4.3 S amp 1 ing . 4.3.1 Preproduction inspection sample. A preproduction sample of 3 p
22、umps manufactured in accordance with 3.2 shall be subjected to the preproduction tests listed in Table IV and detailed in 4.4 through 4.4.4.10 at an activity designated by the procuring activity. of the preproduction sample shall be based on no defects in the sample. See 4.4.6. Further production of
23、 the pump by the supplier, prior to approval of the preproduction sample shall be at the suppliers risk. Acceptance 4.3.2 Periodic production sample. Periodic production samples shall be selected from units that have satisfactorily passed the acceptance inspections of 4.5. These samples shall be sub
24、jected to the tests of 4.6 at an activity designated by the procuring activity. Periodic production sampling shall be as follows: Upon initiation of production randomly select 1 Step 1. unit from each group of 30 units. Upon satisfactory com- pliance of samples selected from 3 consecutive groups, sh
25、ift Step 2. Randomly select 1 unit from each group of 70 units. Continue with Step 2 for the balance of the contract or until a defective unit is found. - to Step 2. When a defective unit is found in any group, acceptance of all units on hand shall be withheld and the contractor shall: a. Determine
26、the cause of -the defect. - b. Take the necessary actions to correct or eliminate the defect from all units on hand and, if so directed by the procuring activity, from those units previously shipped. proposed corrective action to prevent recurrence of the defect. Submit to the procuring activity for
27、 approval the proposed retest program to verify that the corrective action eliminated the defect. - - c. Submit to the procuring activity for approval, the - d. Return otherwise, other cycling rates of frequency change may be used. The sweep rate shall be such that 15 minutes actual vibration time i
28、s required to proceed from the.lower to higher and back to the lower extremity of frequency range in accordance with the accelerations or double amplitudes defined in Table VI. The resonant and cycling period, for each axis, For cycling, a logarithmic TABLE V VIBRATION TEST SCHEDULE Number of Resona
29、nces O 1 2 3 4 Total Vibration Time at Resonance * - 30 min 1 hr 1-1/2 hr 2 hr Cycling Time 3 hr 2-1/2 hr 2 hr 1-1/2 hr 1 hr * 30 minutes each resonance 9 Licensed by Information Handling ServicesLicensed by Information Handling Services. MIL-P-BZqqZ 13 W 7997906 0360902 3 W MIL-P-82442 (OS) 4.4.4.5
30、 TemperaturerSn-operating condition e Two preproduction pumps shal.1 be subjected, in the non-operating condition, to temperature and humidity cycling in the following manner: shall be placed in a Zemperature chamber which has been stabilized at an environmental temperature of -45“ F + O“ - 5“ F. en
31、ain in the environment for 6 hours. the specimen may be placed in the chamber, with the chamber at room am5ient temperature. 4- O“ -5“ F within-2 hours maximum. in the chamber for 4 hours). environmental temperature of +140“ F + 5“ F -0“ F. time from the low temperature to the high temperature shall
32、 be 2 hours. The specimen shall remain in the high temperature environment for 4 hours. shall be 2 hours. environment of +110“ F +5“ percent for a minimum of 8 hours. in accordance with 4.4.4.6 and one pump shall be operated in accordance with 4.4.4.7. Prior to operation the pump may be wiped dry. D
33、rying by an air blast or oven is not permitted. The specimen The specimen shall (As an alternative procedure, Chamber temperature shall then be reduced to -45“ F The specimen shall thereafter remain The specimen shall then be subjected to an Maximum transition This cycle shall be performed 3 times;
34、maximum transition time -0“ F at a minimum relative humidity of 95 The specimen shall subsequently be subjected to an Thereafter, one pump shall be operated 4.4.4.6 Low temperature operating. Before testing , the pump, installed in its test chamber in the ready condition, shall be conditioned at a t
35、emperature of O“ F f 5“ -F for a period of 1 hour. thereafter the pump shall be operated in accordance with and meet the requirements of 4.4.4;l at an environmental temperature Immediately of 4-32“ F k 5“ F. 4.4.4.7 Hiph temperature operating. Before testlng, the pump, installed in its test chamber
36、in the ready condition, shall be conditioned at a temperature of +140“ F f 5“ F for a period of 1 hour. thereafter the pump shall be operated in accordance with and meet the requirements of 4.4.4.1 at an- environmental temperature of +140“ F f 5“ F. Immediately 4.4.4.8. Vibration, packed and package
37、d. The pump, packed and packaged in accordance with Section 5, shall be vibrated in such a manner as tQ determine the frequency producing maximum transmissibility within the frequency range of 5 to 60 cps. The container shall be fastened, in suitable fashion, to the table of. a vibration testing dev
38、ice producing an essentially sine wave motion. The maximum permissible motion freedom shall be approximately 1/32 inch. The specimen shall then be vibrated for 1 .:our at the frequency producing maximum transmissibility and at an input acceleration of 1 g. This test shall be applied to each of the t
39、hree principal orthogonal axes. Licensed by Information Handling ServicesMIL-P-2442 13 777770b 03b0703 5 MIL-P-82442 (OS) 4.4.4.9 Shock, packed and packaged. The pump, packed and packaged in accordance with Section 5, shall be subjected to free fall drop tests. The pump in its container shall bedrop
40、ped from a height of 36 inches, one drop on each of 4 diagonally opposite corners and flat drops, one each, on the bottom and on one side. The drops shall be made on an impact surface of essentially non-yielding material such as stone or concrete. The complete series of drops shall be performed unde
41、r each of the following conditions: room temperature, within 10 minutes after the container has been stabilized at -45“ F k 5“ F, and within 10 minutes after the container has been Stabilized at 4-140“ F t: 5“ F. 4.4.4.10 Operational service life. Each preproduction sample shall complete the life te
42、st requirement by being subjected to a total of ten 7-minute operational tests in accordance with 4.4.4.1 during the pre- production test schedule, Table IV. The number of additional operational tests needed to meet the life requirement is listed in Table IV under “Operation Service Life“. 4.4.5 Tes
43、t data sheets. All test data shall be recorded on a data sheet by the supplier and maintained as part of the inspection records. , In addition to the data requirements o 4.5.5, the data sheets shall contain, but are not limited to, the following information: a. Low temperature operating test: Pump c
44、onditioned for: OF - hrs. at Salt Solution, Temperature “ F b. High temperature operating test: Pump conditioned for: “F - hrs. at 4.4.6 Determination of defect or failure. Failure of a pump to successfullv Dass any of the tests in 4.4 through 4.4.4.10 shall be Licensed by Information Handling Servi
45、cesMIL-P-82442 13 m 7979706 03b0704 7 m MIL-P-8244.2 (OS) 4.5.2 Test conditions. Unless otherwise specified, the pump shall be subjected to the acceptance tests under the following conditions: a. Temperature : b. Altitude: - c. Vibration : - d. Humidity: - - Room ambient +32“ F to +98“ F Normal grou
46、nd atmospheric pressure None Room ambient 4.5.3 fixtures and accessories for mounting the pump, a fluid supply, a drive unit and pressure gages. The following items of equipment are required and shall have the characteristics indicated. Test equipment and Set-up. The pump test stand shall provide a.
47、 Pressure gage: Range: O to 400 psig, accuracy to f 2 percent full scale Operating temperature: +25“ F to 4-100“ F minimum Gage size: 6-inch minimum b. Drive unit: - Horsepower: two nominal Speed: 3880 4 10 rpm Operating temperature: +25“ F to +120“ F minimum . I - c. Water supply: The water supply
48、shall be capable of providing tap water at a rate of 10 gpm at temperatures between +32“ F and +98“ F at a pressure of 15 2 psig at the pump inlet. d. Relief valve : - Cracking pressure: 50 psig Closing pressure: 30 psig e. Fixed orifice: - When connected in the test configuration the fixed orifice
49、shall be capable of producing a pressure of 275 + 10 psig at gage A at a flow rate of 8.3 gpm. 4.5.4 Test procedures. 4.5.4.1 ports, and attach an adaptor to the other outlet port. See Figure 1. Pressurize with hydraulic fluid to 1250 psig for five minutes. There shall be no evidence of continuous leakage. Pressure test. Plug the inlet port, plug one of the outlet Licensed by Information Handling ServicesLicensed by Information Handling ServicesNIL-P-824Ll2 13 W 9779706 0360906 O MIL-P-824.42 (0s) TABLE IX PERIODIC TEST SCHEDULE Sample and Test Sequence 1, 4, Etc. 2,
