1、CANCELED MILITARY SPECIFICATION GAGE, PRESSURE, MANIFOLD, DIRECT INDICATING, 2 IN. SIZ, 10-75 INCHES MERCURY 12 May 1965 Superseding This specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 manifold pressure gages. This specification covers r
2、equirements for sensitive, direct indicating 1.2 Classification. The gages shall be classified as follows: (See 6.3) 28018-1 Fluores cent Dial Markings 28018-2 Lusterless White Dial Markings 2. APPLICABLE DOCIIMEWTS 2.1 The following documents of the issue in effect on date of invitation for bids or
3、 request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS Federal QQ-N- 290 QQ-C-320 QQ-P- 416 PPP-B - 6 36 Military MIL-P-U6 MILE- 5272 MIL-C- 5 541 Nickel Plating (Electrodeposited) Chromium Plating (Electrodeposited) Plating, Cadmium (Electrodeposited
4、) Boxes, Fiber, Solid, For Domestic Shipment Preservation, Methods of Evnironmental Testing, Aeronautical and Associated Equipment, General Specification for Chemical Films and Chemical Film Materials for Aluminum and Aluminum Alloys FSC 6620 Licensed by Information Handling Servicesm 999990b L93770
5、0 TbT m MIL-G-7170A MIL-P-6906 MIL4 - 7742 MIL-P-7936 1-8625 MIL-L- 2 5142 MIL-B-27497 MIL-D- 70 327 STANDfLRDS Federal FED-STD- 595 Military MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-831 -m28018 28105 m33593 m33585 Plates, Identification Screw Threads, Standard, Optimum Selected Series, General S
6、pecification for Parts and Equipment, Aeronautical, Preparation for Delivery Anod.ic Coatings, Aluminum and Alminimi Alloys Lumines cent Material, Fluores cent Bearing, Jewel, Sapphire or Ruby, Synthetic Drawings Engineering and Associated Lists Colors Marking for Shipment and Storage Identification
7、 Marking of U. S. Military Property Specifications and Standards, Orders of Preced.ence for the Selection of Test Reports, Preparation of Gage-Pressure, Manifold, Direct Indicating, 2 in. Size, 10-75 in. Mercury Window, Dial, - Aircraft Instrument Cover - Glass Numerals and Letters, Aircraft Instrum
8、ent Dial, Standard Form of Pointers, Dial Standard Design of Aircraft Instrument Metals, Definition of Dissimilar (Copies of specifications, standards, drawings, and piiblications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity o
9、r as directed by the contracting officer.) 2 Licensed by Information Handling Services9999906 3937703 9Tb 3.1 Qualification. The gage furnished under this specification shall be a product which has been tested, and passed the qualification tests specified herein, and has been listed on or approved f
10、or listing on the applicable Qualified Products Lis t. 3.2 Selection of Government documents. Specifications and Standards for necessary cammodities and services not Specified herein shall be selected in accordance with MIL-STD-143 except as provided in 3.2.1 and 3.2.2. 3.2.1 Ccamnercia parts. Comme
11、rcial parts having suitable properties may be used where, on the date of invitation for bids, there are no suitable stand- ard parts. cotter pins, having suitable properties may be used provided: In any case, commercial utility parts, like screws, bolts, nuts, a. They can be replaced by the standard
12、 parts (MS or AN) without alter- ation. b. The corresponding stanard part numbers are referenced in the parts list and, if practicable, on the contractors drawings. 3.2.2 Standard parts. shall be used where they suit the purpose. drawings by their pzrts numbers. With the exception of 3.2.1, MS and A
13、N standard parts They shall be identified on the 3.3 Materials. Materials shall conform to applicable specifications and shall be as specified herein. Materials for which there are no applicable specifications, or which are not specifically described herein, shall be of the best quality, of the ligh
14、test practicable weight, and suitable for the purpose intended. 3.3.1 Critical materials. Noncritical materials shall be used where practi- cable. tion requirements, the material used shall be the least critical of those which are adequate for the purpose. Where the use of a critical material is ess
15、ential to meet specifica- 3.3.2 Metals. Metals shall be of the corrosion-resistant type, or shall be suitably protected as specified herein to resist corrosion due to salt spray or atmospheric conditions to which the gage may be subjected when in storage or during noml service life. 3.3.2.1 Dissimil
16、ar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals as defined in E33586 shall not be used in intimate contact with each other. 3.3.3 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the gage except where magnetic materials are essential.
17、 3 Licensed by Information Handling Services- 9999906 1937702 832 MIL-G-7170A 3.3.4 Fungus-proof materials. Materials which are nutrients for fungi shall not be used where it is practicable to avo-id them. Where used and not herme- tically sealed, they shall be treated with a fungicidal agent accept
18、able to the procuring activity. However, if they will be used in a hermetically sealed enclosure, fungicidal treatment will not be necessary. 3.3.5 Corrosive fumes. service conditions specified herein shall not liberate deleterious fumes. The materials as installed in the gage and under the 3.4 Desi
19、gn and construction. 28018. jars, vibrations, and such other conditions as are incid.ent to shipping, storage, installation, and service without failure. The operating mechanism shall con- sist of a sealed reference evacuated aneroid compartment and pressure sensing indicatiw mechanism. from the cas
20、e and shall be sufficiently rugged to prevent small distortion of the case from affecting the accuracy of the gage. Unless otherwise specified, the mechanism including the dial, shall be mounted on a metal plate which forms the back of the instrument, and which is secured to it by not less than thre
21、e screws. The mechanism, includ.ing the dial, shall be removable from the rear of the case as a unit. ing of the case by the cover glass. The manifold pressure gages shall conform to Gages shall be so constructed as to withstand the normal strains of The operating mechanism shall constitute a unit s
22、eparate Operation of the gage shall not be dependent upon the seal- 3.4.1 Maintenance. The design of the gage shall be such as to accommodate to the greatest possible extent, disassembly, reassembly, and service maintenance using those tools and items of maintenance equipment which are normally avai
23、l- able as commercial standards. 1 3.4.2 Mechanism adjustment. or correct the indication in case it becomes necessary during the service life of the instrument. The means of adjustment shall be reasonably simple but need not be external to the case. Correction adjustments shall be possible without r
24、emoving the pointer or pointers. moving the dial. The gage shall be provided with means to ad.just Adjustment shall not be accomplished by 3.4.3 Seal. exposed to fuel vapor entering from the manifold pressure connection. mechanism shall be sealed frm such exposure by a metal diaphragm, metal bellows
25、, or similar means. The instrument shall be so designed that the mechanism is not The 3.5 Performance. tests specified in Section 4. 3.6 Case. Reinforcement shall be provided so that the case will not be damaged when connections are tightened during gage installation. 3.6.1 Body and mounting flange.
26、 shall be made of lightweight nonmagnetic metal, uniform in texture, and shall have a smooth surface. with a durable lusterless black finish Color No. 37038 or FED-STD-595. The gage shall perform satisfactorily when subjected to the The gage case shall conform to 28018 and shall be raintight. The bo
27、dy and mounting flange of the case The body and the mounting flange shall be finished 4 Licensed by Information Handling Services 9999906 1937703 779 = MIL-G-7170A 3.6.2 Cover glass. MS28lO5 and shall be clear and free of flaws which interfere with normal reading of the gage. The cover glass shall b
28、e of the size as specified in 3.6.2.1 cover glass shall be as small as practicable and shall not exceed .U5 inch for each single gage. 3.6.3 Pointers. installed as listed in 28018. to prevent oscillation under vibration and shall be free to swing beyond either end of the range without being engaged
29、by a mechanical stop. For the high end of the scale, means shall be provided to prevent the sector gear from becoming disengaged from the pointer pinion. me chanism. Dial to cover glass distance. The distance from the dial to the Pointers shall conform to 33585-8 and MS33585-9 and be They shall be l
30、ight and sufficiently rigid Pointers shall be firmly attached to the 3.6.3.1 fluorescent-luminescent material or lusterless white material Color No. 37875 of FED-STD-595. The visible portion of the pointer shall be finished with either 3.7 Screw threads. in accordance with MIL-S-7742. Screw threads
31、0.060 inch or larger in diameter shall be 3.8 Interchangeability. All parts having the same manufacturers part number shall be directly and cmpletely interchangeable with each other with respect to installation and performance. Changes in manufacturers part number shall be governed by the drawing nu
32、mber requirements of MIL-D-70327. 3.9 Physical requirements. 3.9.1 Weight. The weight of the gage shall not exceed 0.7 pounds. 3.9.2 Finish. Protective coatings and finishes which will crack, chip or scale during normal service life or due to extremes of atmospheric conditions shall not be uced. 3.9
33、.2.1 Aluminum alloy parts. Where practicable, aluminum alloy parts shall be covered with an anodic film conforming to m-8625. do not anodize satisfactorily shall be coated with a chemical film in accord- ance with MIL-C-5541. Aluminum alloys which 3.9.2.2 Iron and steel parts. Where practicable, iro
34、n and steel parts shall be plated in accordance with QQ-C-320, QQ-N-290 or QQ-P-416, as applicable. 3.10 Dial. The dial shall be marked as shown in Figure 1. The markings shall be either fluorescent-luminescent material or lusterless white material Color No. 37875 of FED-STD-595. less black material
35、 Color No. 37038 of FED-STD-595. The background of the dial shall be luster- 3.10.1 Fluorescent-luminescent material. Fluorescent-luminescent material shall conform to MIL-L-25142, type I or III, as applicable. 5 Licensed by Information Handling ServicesM 9999906 1937704 605 M FLUORESCENT MIL-G-7170
36、A .688 * .O10 DIA SUBDIAL. THE DIA MAY BE RECESSED LF: DASH NUMBER) 1 WIDTH OF LINE HEIGHT OR LEXGTHI OR GRADUATION MAIN DIAL 2 1/64 -I ,005 , FINISH 3 1S“l PORTIOX OF POIPJTERS - - I 1UNSHADED PWION OF POINTEES - - LUSTERLESS s28018- 1/16 1 - BLACK , 4- DIMENSIONS IN INCHES. UNLESS OTBERWISE SPECIF
37、IED, TOLERANCES: DECIMALS - -005, FRACTIONS 2 1/64. FIGW 1 6 Licensed by Information Handling Services= 9999906 1937705 541 = MIL-G-7170A 3.10.2 Marking. in service. Numerals shall distinctly indicate the graduations to which each applies. All markings shall be durable to withstand usage encountered
38、 The form of the letters and numerals shall conform to MS33558. 3.10.2.1 Visibility of dial. At least 1/16 inch of the shortest graduations, and other specified markings on the dial shall be visible from any point withir; the fmtrum of a cone whose sid.e makes an angle of 30 degrees with a perpen- d
39、icular to the dial and whose small diameter is the aperture of the instrument case. 3.11 Identification of the product. to the gage cEse, and. shall be marked in accordance with MIL-STD-l3O. A nameplate shall be securely attached 3.12 Workmanship. The gage, including all parts and accessories, shall
40、 be constructed and finished to produce an instrument free from all defects which would affect proper functioning in service. 3.13 Bearing, synthetic. When synthetic besrings are used they shall conform to MIL-B-27497. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection. Unless otherwi
41、se specified in the contract or purchase order, the supplier 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. any of the inspect
42、ions set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves the right to perform 4.2 Classification of tests. be classified as follows : The inspection and testing of the gage shall a. Qua
43、lification tests. Qualification tests are tnose tests performed on gages submitted for qualification as a satisfactory product. b. Acceptance tests. Acceptance tests are those tests performed on gages manufactured and submitted for acceptance under contract. 4.3 Qualification tests. The qualificatio
44、n tests of the gage shall consist of all tests of this specification specified under paragraph 4.7 headed Test methods, conducted in the order listed therein. 4.3.1 Qualification test samples. The qualification test samples shall consist of three gages of each manufacturers part number submitted for
45、 quali- fication testing. responsible for qualification, the samples shall be forwardedto the testing After obtaining authorization for submittal fran the activity 7 Licensed by Information Handling ServicesMIL-G-7170A laboratory d.esignated. in the letter of authorization. plainly id.entified. by a
46、 securely attached. d.urable tag marked with the follow- ing information: (See 6.4). Each sample shall be Sample for qualification tests Gage, Single or Dual as Submitted. by (name) (date) for applicable, Dial qualification tests in accor- dance with the requirements of MIL-G-7170A under author- Man
47、ufacturers Part No. ization (reference letter authorizing test) Indi cat ing , Manifold Pres sure Name of manufacturer 4.3.2 Test Report. When tests are conducted at a location other than a laboratory of the procuring activity, three copies of a test report in accor- dance with MIL-STD- shall be fur
48、nished to that activity. 4.4 Acceptance tests. of the Individ.m.1 tests, and the Sampling plans of this specification. The acceptance tests of the gages shall consist 4.4.1 Individ.ua1 tests. The individual tests of the gages shall consist of the following tests conducted on each gage: Inspect ion S
49、cale error at room temperature Friction error. Damping Position error 4.4.2 Sampling Plan Tests. The sampling plan tests shall consist of Sampling 1 Plan A and Sampling Plan B tests. first have passed the Individual tests. Sampling Plan A and B tests shall not be delivered on contract until they have been refurbished and resubmitted for all the Individual tests. Gages selected for sampling tests shall Gages which have been subjected to 4.4.2.1 random in accordance with the following schedule: Sampling Plan A Sample Selection. SamFles shall be selected at Qu
