1、. .- - _ MIL-T-26772F 36 m 777770b 02L17287 7 m I , _ r- ,* . 19 MAY 1970 I MIL-T-26772F (USAF) . _. I+ I* SUPERSEDING ._ XLITARY SPECIFICATIOU . MIL-T-26772E(USAF) 17 September 1963 ,: TRAILER, COMPRESSED GAS CYLINDER, AIR OR NITROGEN, OIL PWEI), SERVICING, P-WmEL, 8-CYLI”ER, . .- 3500 PSI, TYPE MD
2、-3A - -I -. 1. SCOPE 1.1 This specification covers one type of air or nitrogen servicing, com- pressed gas cylinder trailer, designated Type MD-3A. 2. APPLICABLE DOCUMENTS 2.1 bids or request for proposal, form a part of this specification to the extent specified herein: The following documents, of
3、the issue in effect on date of invitation for SPECIFICATIONS Federal - RR-c-9 o 1 UU-T-81 PPP-C-650 PPP-T-60 Mlitary MIL-T-3065 MIL-V-4719 MIL-C-48 10 MU-I- 6 86 6 MIL-1-6868 MIL-T-7003 MIL-W-8005 MIL-M-8090 MIL-A-8421 MIL-R-13689 MIL-B-22182 KIL-M-26512 k , Cylinders, Steel, Seamless, Type 3A (For
4、Compressed Gases) Tags, Shipping and Srock Crate, Wood, Open an coverea Tape, Pressure Sensitive Adhesive, Waterproof - For Packaging and Sealing Rubber, Fabricated Parts Valve, Oxygen Line, High Pressure, Aircraft Ser- vie ing Cylinder, Oxygen Purifier, Type MB-1 Inspection, Penetrant Method of Ins
5、pection Process, Magnetic Particle Trichlorethylene, Stabilized Degreasing Wheels and Hubs for Industrial Pneumatic Tires Mobility Requirements, Ground Support Equipment, General Specification for Air Transportability Requirements, General Speci- ficatim for Reflectorized Sheeting, Adhesive (Retro-R
6、eflective) Brakes, Parking, Mobile Ground Support Equipment Maintainability Requirements for Aerospace Systems and Equipment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-T-26772F 36 = 7977706 0247270 3 = MU-T-267 72F (USAI?) 49cFR 71-78 Inter
7、state Commerce Commission Rules and Regula- tions for the Transportation of Explosives and Other Dangerous Articles (The Interstate Commerce Commission regulations are now a part of the Code of Federal Regulations (1949 Edition-Revised 1950) available from the Superinten- dent of Documents, Governme
8、nt Printing Office, Washington 25, D.C. Orders for the above publication should cite “49 CFR 71-78 (Rev. 1950.)“. MIL-H-2 6666 MIL-T-27730 MIL-R-38489 Hose Assembly, Pneumatic, High Pressure Tape, Antiseize, Tetrafluoroethylene, with Dispen- ser Reels, Static Discharge, Grounding, W-17/E and Rb- 1 8
9、 /E STANDARDS Military MIL-STD-129 . Marking for Shipment and Storage MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-143 . Specifications and Standards, Order of Precedence for the Selection of NIL- STD - 80 8 Finishes , Protective , and Codes, for Finishing Schemes for Ground
10、and Ground Support Equipment MIL-STD-1186 Cushioning, Anchoring, Bracing, Blocking and Waterproofing with Appropriate Test Nethods MS33656 Fitting End, Standard Dimensions for Flared Tube Connection and Gasket Seal Air Force-Navy Aeronautical AN6235 Filter Element - Hydraulic Replscement Micronic Li
11、ne Type DRAWINGS Air Force 44A19817 48B7796 Ring Assembly - Tie Down, 10,000 Lb. Chuck Assembly - High Pressure Air (Copies of specifications, staniiards, drawings and publications required by suppliers in connection with specific procurement furktions should be obtained from the procuring activity
12、or as directed by the contracting officer.) 2.2 Other publications. cation to the extenc specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. The following documents forma part of this specifi- Interstate Cmerce Canmiss
13、ion Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-26772F 36 7q77706 02L17272 5 Compressed Gas Association Pamphlet S-1 -Safety Relief Device Standards (Application for copies should be addressed to the Compressed Gas Association, Incorporated
14、, 11 West 42nd Street, New York 18, New York.) American Society Of Mechanical Engineers Power Test Code 19.5:4 Supplements on Instruments and Apparatus; Part 5, Chapter 4, Flow Measurement by Means of Standard- ized Nozzles and Orifice Plates (Application for copies should be addressed to the Americ
15、an Society of Mechani- cal Engineers, 29 West 39th Street, New York 18, New York.) 3. REQUIWNTC 3.1 Preproduction. This specification makes provisions for preproduction testing. 3.2 Components. (see figures 1, 2, and 3): The trailer shall consist of the folll Clamps. A quick acting and easily access
16、ible bar arrangement, designed to.hold the cylinders in place shall be provided. 3.8.2.3 Bulkhead. A steel bulkhead shall be provided on the trailer chassis at front end of the cylinder assembly. holes through which the cylinder necks protrude. The bulkhead shall contain contoured 11 Provided by IHS
17、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-26772F 36 m 777770b 02Lf7300 2 m MU-T-Z6792P(USAF) 3.8.2.3.1 The bulkhead shall be of sufficient overall width and height to extend not lees than 2 inches beyond the extreme cylinder outline as viewed from the e
18、nd. Bulkhead thickness shall be sufficient to retain the cylinders in the proper longitudinal position and insure against movement when the trailer is subjected to the conditions specified here,in e 3.8.2.3.2 braced by compression or tension members so that longitudinal movement of the cylinders wil
19、l not occur under the conditions specified herein. shall beinstalled to be readily demountable without the use of special tools and without breaking welds or seals 3.8.3 Manifold system. working pressure of 3500 psi. connected to the servicing systen as shown on figure 2. Bulkhead bottoms shall be s
20、ecured to the chassis and the tops Bulkheads The cylinder manifold system shall be designed for a The cylinders shall be manifolded together and . 3.8.3.1 Manifold connecting lines, Stainless steel connecting lines of not less than 1/4 inch inside diameter shall be provided between the storage cylin
21、- ders and the manifold, and between the manifold and the servicing hose connec- tion as shown on figure 2. Each connecting line shall be fabricated and in- stalled to insure against applying damaging stresses to the manifold piping or the line connections as-a result of the relative movement betwee
22、n the trailer components that occurs during transport and use in servicing opera- tions. 3 8.3.2 Intermediate control valves. Intermediate control valves shall be Circle Seal Part Number B933T-2PP(P) or equal. 3.8.3.3 Manifold and storage cylinder safety devices. The manifold and each compressed gas
23、 storage cylinder shall be protected against excessive pressuree with metal rupture discs conforming to CGA Pamphlet S-1 as shown on figure 2. The rupture disc shall be trie CG-1 of the unbacked, frangible type. The disc bursting pressure shall be 5,000 2 250 psi. 3.8.3.4 Manifold shutoff valves, A
24、manually operated shutoff valve shall be Circle Seal Part Number. B933T-2PP(P) or equal. 3.8.3.5 System recharging valve assembly. A system recharging valve assembly shall be provided in the manifold piping as shown on figure 2. The system recharging valve assembly shall consist of a recharging valv
25、e and a recharging disconnect fitting. The recharging valve outlet shall be directly connected to the manifold. The recharging disconnect fitting shall be connected to the recharging valve inlet. 3.8.3.5.1 Recharging valve. ted shutoff valve designed and constructed in accordance with 3.8.3.2. 3.8,3
26、.5.2 Recharging disconnect fitting. The recharging disconnect fitting shall be designed, constructed and installed for ready and leaktight attach- ment of the hose specified in paragraph 3.8.4.4.1. The recharging valve shall be a manually opera- Provided by IHSNot for ResaleNo reproduction or networ
27、king permitted without license from IHS-,-,-MIL-T-2677ZF 36 779970b 0247303 4 MIL-T-26772F (USAF) 3.8.3.5.2.1 Disconnect fitting mounting. The recharging disconnect fitting shall be so mounted that force applied in attaching or removing a recharging hose or while a recharging hose is attached will n
28、ot damag the manifold sys- tem piping. 3.8.3.5.2.2 Protective cap. The recharging disconnect fitting shall be pro- vided with a protective cap that will tightly close and protect the fitting when a recharging hose is not attached. The protective cap shall be attached to the disconnect fitting by a c
29、hain or other device to protect against acci- dental loss. 3.8.4 Servicing system. canpressed gas from the high-pressure storage cylinders and manifold into the system being charged. The servicing system shall consist of a purifier, fil- ter, pressure regulator, and a servicing hose assembly. 3.8.4.
30、1 Purifier cylinder. A purifier cylinder conforming to MIL-(2-4810 shall be provided in the servicing system as shown on figure 2. purifier cylinder shall provide for ready access through the panels specified in 3.8.7.1 for cartridge change and maintenance. The servicing system shall provide for ser
31、vicing the Installation of the 3.8.4.2 Gas filter assembly, equipped with, an AN6235-3A or AN6235-4A filter element shall be provided in the servicing system as shown on figure 2. The filter assembly shall have a working pressure.of 3500 psi. shall insure against gas bypssing the filter element, and
32、 provide for easy and ccnveaient replacement of the filter element. A gas filter assembly designed to use, and Design and construction of the filter assembly 3.8.4-3 Hiph-low pressure regulator. The pressure regulator shall be Victor Model BLR 10 or equal and shall meet the test requirements of Sect
33、ion 4. 3.8.4.3.1 Overpressure relief device. A differential-type, overpressure relief device shall be provided on the law-pressure side of the regulator. The relief device shall start to vent before the downstream pressure reaches 100 psi above any set dead-end pressure up to 3500 psig and flow shal
34、l reach at least 30 scfm before the downstream pressure reaches 400 psi above the dead-end pressure. The relief device shall reseal after venting when the outlet pressure is reduced to not less than the set dead-end delivery pressure. 3.8.4.3.2 Regulator pressure zaaes. The pressure regulator instal
35、lation shall be equipped with a regulator gauge and high and low outlet pressure gages. 3.8.4.3.2.1 Remlator gage. The regulator gage shall be identical to the cyl- inder pressure gages. 3.8.4.3.2.2 not less than 4-1/2 inches shall be provided for indicating the regulator out- let pressure as oham o
36、n figure 1. 5,000 psi, shall be accurate to within one-half of 1 percent of full scale, an shall have a safety back. indicating each 500 psi increment plus intermediate interval graduations indi- cating 50-psi increments throughout the entire range. High-pressure outlet gage. A pressure gage with a
37、dial diameter The gage shall have a scale range of O to The gage face shall have figure intervals, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_- -_- -. MIL-T-26772F 36 .I 7797906 02L17302 b _-_- Mu-T-26772F (UM) 3.8,4.3.2.3 Low-pressure outlet g
38、age. A pressure gage with a dial diameter not less than 4 1/2 inches shall be provided for indicating thez-gulator low outlet pressures as shown on figure 1. The gage shall have a scale range of O to 600 psi, shall be accurate to one-half of 1 percent of full scale, and shall have figure intervals i
39、ndicating each 50 psi increment plus intermediate interval graduations indicating 5 psi increments throughout the entire range. Provisions shall be made to insure against damage to the gage when tbe ser- vicing line is pressurized to 3500 psi. 3.8.4.3.3 Filter screen. A filter screen which will reta
40、in all particles of 200 mesh or larger size shall be provided in the regulator inlet to protect the mechanism. 3.8.4.4 Servicing hose assembly. A servicing hose assembly consisting of a servicing hose, a servicing valve, and a hose extension shall be provided in the servicing system as shown on figu
41、re 2. 3.8.4.4.1 size 4, pneumatic hose assembly conforming to MIL-H-26666. Servicing hose. The servicing hose shall be a 30 metal chips; and other foreign material shall be removed during and after final assembly. f 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
42、nse from IHS-,-,-. MIL-T-26772F 36 W 779770b 0247305 L M1L-T-26772F(USAP) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract or purchase order, the supplier is responsible for the performance of all inspection requirements specified herein
43、. the supplier may utilize his own facilities or any comercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assuresupplies and services conform to prescribed
44、requirements. Except as otherwise specified, 4.2 shall be classified as follows: Classification of tests. The inspection and testing of the trailer a. Preproduction testing (see 4.4) b. Acceptance tests (see 4.5). 4.3 Test conditions. Unless otherwise specified, tests shall be conducted under ambien
45、t conditions (see 6.3.4). 4.3.1 Instrtnnentation. 4.3.1.1 Pressures. Pressures and pressure differentials shall be measured by means of Bourdon-type gages. Wherever practicable, the gages furnished as part of the trailer shall be utilized. 4.3.1.1.1 Pressures shall be recorded in pounds per square i
46、nch gage . 4.3 .l.Z . Temperatures. Temperatures shall be measured by appropriately located therinaneters or thermocouples used with calibrated potentiometers. 4.3.1.2 1 4.3.1.3 Barometric pressuke. Barometric pressure shall be measured by a properly calibrated mercurial or aneroid barometer. . Temp
47、era tures shall be recorded in degrees Fahrenheit . 4.3.1.4 Gas flow rates. Gas flow rates shall be measured with standardized nozzles or orifices as specified in ASME Power Test Code PTC 19.5:4. 4.3.1.4.1 Gas flow rates shall be recorded as standard (29.92 inches Hg and 700 F) cubic feet per minute
48、. 4.3.2 Test data. L 4.3.2.1 Correction of data. If the tests specified herein cannot be conduc- ted under the stated conditions, the tests may, upon approval by the procuring activity, be conducted under other conditions and the performance under the specified conditions calculated from the test re
49、sults obtained. The manner of calculation methods used shall be presented for review by the procuring acti- vity. -. .-: . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. _ - - - MIL-T-26772F 36 W 7977706 0247306 3 W I - _ MlL-T-P6772F(USAF) 4.3,Z.Z Operational data. recarded when specified for an individual. test, and shall be taken at the intervals specif
