1、GAGES, PRESSURE, DIAL INDICATING This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1. SCOPE 1.1 Scope - This specification covers certain design and all performance require- ments for the procurement of direct indicating pressure gages used on aircraft and
2、missiles. 1.2 Classification - The gages shall be of the following MS designations with the case size and dial scale as shown for the applicable MS part number specified. MS CaseSize Dial Dial Ms Case Size Dial Dial Designation in inches Markings* Scale Designation In inches Markings* Scale MS17856-
3、1 MS17856-2 Ms17856-3 MS17856-4 MS17856-5 MS17856-6 MS17857-I MS17857-2 MS17857-3 MS17857-4 MS178 5 7 -6 MS17857-8 MS17857-5 MS17857-7 3/4 3/4 3/4 3/4 3/4 3/4 1 1 1 1 1 1 1-1/2 1 - 1/2 6 8 10 11 12 13 6 8 10 11 12 13 6 8 0-500 0-1000 0-2000 0-3000 0-4000 0-5000 0-500 0-1000 0-2000 0-3000 0-4000 0-50
4、00 0-500 0-1000 MS17857- 9 MS17857-10 MS17857-11 MS17857- 12 MS17857-?3 MS17857- 14 MSl.7857-15 MS17857-16 MS17857-18 MS17857-19 MS17857-20 MS17857-21 MS17857- 22 MS17857-23 MS17857-24 NIs17857- 25 MS17857- 17 1 - 1/2 i-1/2 1-1/2 i-1/2 2 2 2 2 2 2 2 2 2 2 2 2 2 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12
5、 13 0-2000 0-3000 0-400Q 0-5000 O- 50 0-100 0-200 0-300 0-400 O- 500 0-600 0-1000 O- 1500 0-2000 0-3000 0-4000 O- 5000 * See Figure 1. 2. APPLICABLE DOCUNIENTS 2.1 General - The following documents, of the issue in effect on the date of the invitation for bids, formpart of this specification to the
6、extent specified herein: -. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-23$97(WEP) SPECIFICATIONS Federal DD-G-451 _- - w-c-w QQ-N-280 QQ-P-416 Wtary - MIL-P-116 MIL-M-3171 MIL-E-5272 MIL-C-5541 MIL-L-6086 MIL-1-6181 MIL-5-6872 MIL-S-7742
7、 MIL-P-7936 MIL-A-8625 MIL-D-70327 STANDARDS Federal FED-S“Q-1 FED-STD-595 Military MIL-STD-130 MIL-STD-143 MS17856 MS17857 Glass, Flat and Corrugated, for Glazing, Mirrors and ther Uses chromium Plating (Electrodepoeited) Nickel Plating (Electrodeposited) Plating, Cadmium (Electrodeposited) Preserv
8、ation, Methods of Magnesium Aiioy, Processes for Corrosion Protection of Environmental Testing, Aeronautical and Associated Equipment, General Specification for Chemical Films for Aluminum and Aluminum Alloys Lubricating Oil, Aircraft Instrument, Low Volafflity Intederence Control Requirements, Airc
9、raft Equipment Soldering Process, General Specification for Screw Threads, Standard, Optimum selected series; General Specification for Parts and Equipment, Aeronautical, Preparation for Delivery Anodic Coatings, for Aluminum and Aluminum Alloys Drawings, Engineering and Associated Lists Standard fo
10、r Laboratory Atmospheric Conditions for Testing Colors Identification Marking of the U. S. Military Property Specifications and Standards, Order of Precedence for the Selection of Gage, Pressure, Dial Indicating, Stainless Steel Case Gage, Pressure, Dial Indicating, Non-Ferrous Case 2 Provided by IH
11、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-23337 66 M 7777706 013L757 B / MIL-(3-23337 WP) MS33558 Numerals and Letters, Aircraft instrument Dial, Standard form of MS33586 Metals, Definition of Dissimilar MS33656 Fitting End, Standard Dimension for Flar
12、ed Tube Connection and Gasket Seal MS33639 Air Force-Navv Aeronautical Case, instrument, Clamp Mounted, Aircraft 2.2 AND 10050 Bosses, Standard Dimensions for Gasket Seal Straight Thread Availability of Documents - (1) When requesting any of the applicable documents refer to .both title and number.
13、Copies of this specification and applicable documents required by contractors in connection with specific procurement functions may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code CDS, 5801 Tabor Avenue, Philadelphia 20, Pennsylvania. 3. REQUIREMENTS 3.1 Preproductio
14、n - The gages furnished under this specification shall be products, Selection of Government Documents - Specifications and Standards for necessary samples of which have been tested and have passe the preproduction tests specified herein. commodities and services not specified herein shall be selecte
15、d in accordance with ML-STD-143 except as provided in 3.2.1 and 3.2.2. Commercial Parts - Commercial parts having suitable properties may be used where, on the date of invitation for bids, there are no suitable standard parts. in any case, com- mercial utility parts, like screws, bolts, nuts, cotter
16、 pins, having suitable properties, may be used provided 3.2 3.2.1 (a) They can be replaced by the standard parts (MS or AN) without alteration. (b) The corresponding standard part numbers are referenced in the parts list and if practicable, on the contractors drawings. 3.2.2 Standard Parts - With th
17、e exception of 3.2.1, MS and AN standard parts shall be used where they suit the purpose. They shall be identified on the drawings by their part numbers. 3.3 Materials - Materials shall conform to applicable specifications and shall be as specified herein. Materials for which there are no applicable
18、 specifications, or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight and suitable for the purpose intended. 3.3.1 Critical Materials - Noncritical materials shall be used where practicable, Where the use of a critical material is essential
19、 to meet specification requirements, the material used shall be the least critical of those which are adequate for the purpose, 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-23337 bh m 777990h 0333760 4 MIL-G-23337(WEP) 3, 3. 2 Metals - Met
20、als shall be of the corrosion-resietant type, or shall be suitably protected as specifkThZFein to resist corrosion due to fuels, salt spray or atmospheric conditions to wich the instrument may be subject when in storage or during norma service Ufe. Dissimilar Metals - Dissimilar metals as defined in
21、 MS33586 shall not be used in intimate contact with each other, unless suitably protected against electrolytic corrosion by means of protective coatings or hermetic seaing. the instrument except where magnetic materials are essential. used where it is pra-oiathem. Where used and not hermetically sea
22、led, they shall be treated with a fungicidal agent acceptable to the procuring activity, if used in a hermetically sealed case, fungicidal treatment wiil not hc! necessary. Corrosive Fumes - Materials used in the interior construction of the instrument shall not produce corrosive or deleterious fume
23、s. Design and Construction - The gage shall be designed to meet the operational requirements of this specification. The instrument shail be so constructed that no parts wiU work loose in service and wiil withstand the normal strains of jars, vibrations and such other conditions as are incident to sh
24、ipping, storage, installation and service without failure. Maintenance - The construction ahall be reasonably simple to facilitate as much as possible disassembly, repair or overhaul, service maintenance, and reassembly by those tools and items of maintenance equipment which are normaliy available a
25、s commercial standards without requiring special tools and fixtures, the one inch, one mxe haif inch and two inch sizes, The dimension designated as L on MS33639 shall not exceed two inches for each gage, The cases of the gages vS17856 and with the pressure decreas- ing, the pressure shall be brough
26、t down to, but shall not fail below, the pressure specified to give the desired reading. The scale error shall not exceed the tolerances specified in Table II. 4.6.3 Friction Test - The instrument shall be tested for friction at each alternate test point on increasing readings indicated in Table II
27、beginning with the second test point. The pressure shall be increased slowly to bring the pointer approximately to the desired reading, and then held constant while two readings are taken, the first before the gage is vibrated, the second after the gage is vibrated, This test may be combined with th
28、e test for scale error. 4.6.4 Leakage Test - Pressure of 80% of range shall be applied to the gage. The con- nection of tubing shall then be pinched off or otherwise completely sealed at a point within 2 inches of the pressure connection. During a period of 10 minutes, the pointer shall be observed
29、for deviation from the original pressure setting. Any drop of pressure that can be attributed to leaks in the bourdon tube shall be cause for rejection. 4.6.5 Overpressure Test - The applied pressure during this test shall be 150% of the rated pressure for each type. After the testing procedure the
30、instrument shall be subjected to and meet the requirements specified in the following tests. (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test (3) Leakage Test Vibration Test - The gage shall be tested in accordance with procedure XII of 4.6.6 Specification ML-E-5272 except t
31、hat the G level shall be 20 G. At the end of the test the instru- ment shall be subjected to and meet the requirements specified in the following tests, (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test (3) Leakage Test Low Temperature Exposure Test - The gage shall be tested
32、 in accordance with 4.6.7 Procedure II of Specification MIL-E-5272. After the testing procedure, the instrument shall be sub- jected to and meet the requirements specified in the following tests: (1) Scale Error at Room Temperature Test (See Table II) (2) _Friction Test High Temperature Exposure Tes
33、t - The gage shall be tested in accordance with 4.6.8 Procedure II of Specification MIL-E-5272. After the testing procedure, the instrument shall be subjected to and meet the requirements specified in the following tests: (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test 11 P
34、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-23337WEP) 4.6. O Temperature Shock Test - The gage shall be tested in accordance with procedure X of Specification on MIL-E-5272. After the testing procedure, the instrument shall be subjected to a
35、nd meet the requirements specified in the following tests. (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test Low Temperature-High Altitude Test - The gage shall be tested in accordance 4.6.10 with Procedure I of Specification MIL-E-5272. After the testing procedure, the instr
36、ument shall be subjected to and meet the requirements specified in the following tests: (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test Altitude Test - The gage, properly connected, shail be tested in accordance with 4.6.11 Procedure VI, Condition E of Specification MIL-E-5
37、272 for a period of one hour, During the last 5 minutes of the one hour period and with the temperature and pressure maintained as specified the instrument shall. be subjected to and meet the requirements specified in the following tests: (1) Scale Error at Room Temperature Test (Except Tolerance 16
38、%) (2) Friction Test Shock Test - The gage shall be tested in accordance with Procedure IV of Endurance Test - The gage shall be subjected to 100,000 applications of pressure 4.6.12 4.6.13 Specification MIL-E-5272 except the shock force shall be 100 G. in a range which produces an indication from O
39、to 80 f 5 percent of the range of the gage at a rate of 30 h 10 cycles per minute, The application and release of pressure shall be as smooth as practicable, so as not to subject the instrument mechanism to excessive acceleration and show approximate sign wave shape, The gage shall be tested for sca
40、le errors not less than one hour after the pressure cycling, the errors shall not exceed the tolerances specified in Table II. Any pressure gage sub- jected to the endurance test shall be examined to determine if the moving parts have been worn to the extent that premature failure may occur during a
41、ctual service conditions, Units subjected to this test shall not be serviceable and will not be accepted on contract, After the testing procedure, the gage shall be subjected to and shall meet the requirements Specified in the following tests: (1) Scale Error at Room.Temperature Test (See Table II)
42、(2) Friction Test (3) Leakage Test Humidity Test - The gage shall be tested in accordance with Procedure l of Specification MIL-E-5272, After the testing procedure, the instrument shall be subjected to and meet the requirements specified in the following tests: 4.6.14 (1) Scale Error at Room Tempera
43、ture Test (See Table II) (2) Friction Test 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-23337 66 M 7777706 0333769 O MIL-G-23337WEP) 4.6.15 Fungus Resistance Test - The gage shall be tested in accordance with Procedure I of Specification
44、MIL-E-5272, except that the test period shall be 14 days. At the option of the procuring activity, tests of component parts of the item may be accepted in lieu of, or in addition to, tests of the assembled gage. Specification MIL-E-5272. After the testing procedure, the instrument shall be subjected
45、 to and meet the requirements specified in the following tests: 4.6.16 Sait Spray Test - The gage shall be tested in accordance with Procedure I of (1) Scale Error at Room Temperature Test (See Table II) (2) Friction Test 5. PREPARATION FOR DELIVERY 5.1 Packaging - 5.1.1 Level A - The gage shall be
46、packaged in accordance with Specification MIL-P-7936. The methodof preservation shall be in accordance with Specification MIL-P-116, Method 1A5, omitting preservation compound. 5.1.2 Level C - When this level is required, packaging shall be in accordance with standard commercial practice. 5.2 Packin
47、g - 5.2.1 Levels A and B - The instrument shall be packed in accordance with Specification Nm-P-7936. The level or levels required shaii be as specified in the invitation for bid or contract. Level C - The instrument shall be packed to insure that the shipment arrives in a satisfactory condiZT% - .
48、13 F, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6.3 Drawing Requirements - The attention of contractors is invited to the fact that Government contracts for equipment, whether procured directly by the Government or through another contractor, r
49、equire that a4 drawings submittedmust be in accordance with the requirements of Specification MIL-D-70327. 6.4 Definitions - 6,4,1 6.5 Amplitude - Whenever the word Ifamplitudeff is specified, it shall mean the Provisions for Preproduction Tests - The manufacture of instruments on contract extent of motion as measured from one extreme to the opposite extreme, shall not commence until the samples submitted are pronounced satisfactory by the procu
