1、MIL-DTL-25666/5 (USAF) 15 September 1995 SUPERSEDING 20 September 1978 MIL-C-27336B (USAF) DETAIL SPECIFICATION CONVERTER, LIQUID OXYGEN TYPE GCU- 17/A This specification is approved for use by the Department of the Air Force and is available for use by all Departments and Agencies of the Department
2、 of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of liquid oxygen converter with a capacitance gauging element. It provides storage and pressurization of 25 liters of liquid oxygen to 300 pounds per square inch gauge Sig), nominal pressure and does not include warming coils. The c
3、onverter is designated type GCU-l7/A. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are needed to meet the requirements specified in sections 3, 4, and 5 of this specification. This section does not include documents cited in other sections of this specification or recomm
4、ended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3,4, and 5 of this specification, whether or not they are listed. 2.2 Gov
5、ernment documents. 2.2.1 SDecifications. and standar ds. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these docunients are those listed in the issue Of the Department of Defense Index for Specificati
6、ons and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-V-9050 MIL-(2-255 16 MIL-DTL-25666 Valve, Oxygen, Pressure Relief, Aircraft Connectors, Electrical , Miniature, Coaxial, Environment Resistant Type, Converter, Liquid Oxyg
7、en, Capacitance Type Gauging, General Specification General Specification for For Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use improving this document should be addressed to: OC-ALCRICLA, 300 1 Staff Drive, Tinker AFB, OK 73 145- 5990 by usin
8、g the Standardization Document Improvement Proposal D Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 1660 PISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
9、e from IHS-,-,- - HIL-DTL-25686/5 m 9999906 2005832 658 m MIL-DTL-25666/5 STANDARD DEPARTMENT OF DEFENSE MIL-STD-129 Marking for Shipment and Storage (Unless otherwise indicated, copies of federal and military specifications, and standards are available fiom the Standardization Documents Order Desk,
10、 Building 4D, 700 Robbins Ave, Philadelphia, PA 191 11-5094) 2.3 Orde r of Precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this documents takes precedence. Nothing in this document, however, supersedes applicable laws and regulati
11、ons unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Oualification. Converters furnished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.2 and 6.3). 3.2 Desi-. The conver
12、ter shall conform to the dimensions and general design as shown on figures I and 2. The converter shall have a minimum capacity of 25 liters of liquid oxygen measured at 1 atmosphere plus at least 3 percent of this volume to allow for the change in liquid density at the operating pressure. The conve
13、rter shall be designed for an operating pressure of 300 psig. The converter shall be integrally shock mounted so that the entire converter assembly, including ports, is isolated fiom the mounting base. The natural resonant frequency of the vibration isolators shall fall between 8 and 30 cycles per s
14、econd (cps). No resonance of the converter shall occur at a frequency less than 40 cps. The bosses for all pipe thread ports shall be fabricated fiom corrosion-resistant steel. 3.2.1 Schematic diamam. The converter shall be designed in accordance with the schematic diagram as shown on figure 3. 3.2.
15、2 Desim strenh. The converter shall be designed to satis the dynamic force requirements specified in MIL-DTL-25666. When subjected to the acceleration test, the following exceptions to the values for G levels shall apply. Vertical (down) 9G Vertical (up) 3G Lateral 4G 3.2.3 Relief valves. The relief
16、 valves shall conform to the performance requirements of types III and IV of MIL-V-9050 and shall be of such size and shape to fit the overall dimensions specified for the converter. 3.2.4 Weight. The weight of the complete converter shall not exceed 40 pounds. 3.2.5 Markine of orts. Ports shall be
17、marked as shown on figure 2. 3.2.6 Overpressure safety device. Safely discs or other secondary overpressure devices, as specified in 3.6.6 of MIL-DTL-25666 shall not be required for this converter. The design of this converter incorporates two pressure relief valves, in accordance with MIL-DTL-25666
18、. 3.3 Performance. 3.3.1 -. The pressure used for the Final Assembly Pressure test shall be 320 psig. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 il IL- D T L- 25 b b b ! 5 999990b 2005833 594 MIL-DTL-25666/5 b 3.3.2 Fillin? time. Filling tim
19、e shall not exceed 10 minutes when the converter is tested as specified in MIL- DTL-25666. 3.3.3 Evaporation los. 3.3.3.1 Vent condition. The evaporation loss of the essentially full converter in the vent condition shall not exceed 4 pounds of oxygen when tested as specified in MIL-DTL-25666. 3.3.3.
20、2 Buildup condition. The evaporation loss of the essentially full converter in the buildup condition shall not exceed 4 pounds of oxygen when tested as specified in MIL-DTL-25666. 3.3.4 BuilduD time. Buildup time shall not exceed 10 minutes when the converter is tested as specified in MIL-DTL-25666.
21、 3.3.5 Cayacitance. The capacitance of the sensing element of the empty converter shall be 303.5 k2.5 picofarads (pf). 3.3.6 Inner vessel pressure. 3.3.6.1 Innervessel. The inner vessel shall meet the performance requirements for the inner vessel pressure test specified in MIL-DTL-25666 when subject
22、ed to a pressure of 500 psig. 3.3.6.2 Permanent volumetric expansion. The converter shall meet the performance requirements for permanent volumetric expansion as specified in MIL-DTL-25666 when subjected to a pneumatic or hydrostatic pressure of 500 psig. 3 3.7 Delivery rate. 3.3.7.1 Constant flow.
23、The converter shall deliver a flow of gaseous oxygen up to 150 liters per minute for not less than 2 hours with the operating pressure remaining between 295 and 3 15 psig after the first 15 minutes of flow. An intermittent increase or decrease of pressure by an additional 5 psig is allowable provide
24、d these variances do not exceed a 2 minute interval for any one pressure cycle. The flow at the specified rate shall be initiated within 10 minutes after the converter has reached the operating pressure. The full test procedure is specified in MIL-DTL- 25666. 3.3.8 Calibration. The capacitance sensi
25、ng element shall have characteristics which provide for a linear relationship between electrical capacitance and volume of liquid oxygen sensed. The relationship shall be as shown on figure 4, using the equations to determine tolerances. An example of use of the equations is as follows: At the 10 li
26、ter test point, suppose the actual quantity of liquid oxygen is 10.1 liters. The measured capacitance must be between C maximum (max) and C minimum (min). C min= 5.715 x 10.1 + 300.5 = 358.2 pf C rnax = 5.875 x 10.1 + 306.5 = 365.8 pf 3.3.8.1 Equations. The following equations shall be used to calcu
27、late the maximum and minimum capacitances: Values less than 5 liters Values meater than 5 liters C min = 5.6L + 301 .O C max = 6.0L + 306.0 C min = 5.715L + 300.5 C rnax = 5.875L + 306.5 C = Capacitance in PF L = Exact quantity in liters of liquid at test point 3 Provided by IHSNot for ResaleNo repr
28、oduction or networking permitted without license from IHS-,-,-9999906 2005834 420 MIL-DTL-25666/5 3.3.9 -. The operating pressure shall remain between 295 and 320 psig after the fmt 15 minutes of flow at the low temperature and between 290 and 3 15 psig after the 15 minutes of flow at the high tempe
29、rature. An intermittent increase or decrease of pressure by an additional 5 psig is allowable provided these variances do not exceed a 2-minute interval for any one pressure cycle. 3.3.10 Vibration. 3.3.10.1 Vibration. The converter shall not exhibit physical evidence of damage after completion of t
30、he vibration tests as specified in MIL-DTL-25666. 3.3.10.2 Vibration - resonance. The converter shall not exhibit physical evidence of damage after completion of the resonance portion of the vibration test specified in MIL-DTL-25666. 3.3.10.3 Vibration - cvcling. The converter shall not exhibit phys
31、ical evidence of damage after completion of the cycling portion of the vibration test specified (see 4.4.1). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2) b. Conformance inspection (see
32、 4.3). 4.2 Quai ification inspection. The qudification inspection shall consist of ali the inspection methods specified in MIL-DTL-25666. 4.3 Confomce inmedion. The conformance inspection shall consist of the individual tests and the sampling plans and tests specified in MIL-DTL-25666. 4.4 Vibration
33、. 4.4.1 Vibration - cvcling. The converter shall be vibrated under the cycling conditions specified herein for the applicable periods listed in table I. The frequency shall be cycled between 5 to 40 cps or as Specified in the applicable associated specification and return in a 15 minute cycle at an
34、applied double amplitude of 0.060 inch or an applied acceleration of klOG which ever is the lower G value. The rate of change of frequency shall be logarithmic (see 3.3.10.3). 5. PACKAGING 5.1 Packapinp. Packaging requirements shall be as specified in the contract or order (see 6.2). 5.2 Marking. Un
35、less otherwise specified (see 6.2), marking shall be in accordance with MIL-STD-129. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. The 25 liter, 300 psig converter covered by this specification is intended
36、 for use in B-52 airplanes. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DL-25666/5 999990b 2005835 367 MIL-DTL-2566615 6.2 Ordering data. Procurement documents should specify the following; a. Title, number and date of this specification. b
37、. Issue of DODISS to be cited in the solicitation, and if required, the specific issue of individual documents referenced (see 2.1). 6.3 Oualification. With respect to products requiring qualification, awards will be made only for products which are, at the time of award of contract, qualified for i
38、nclusion in Qualified Products List QPL-25666 whether or not such products have actually been so listed by that date. The attention of the contractors is called to these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tes
39、ted for qualification in order that they may be eligible to be awarded contracts or purchase orders for the products covered by this specification. Information pertaining to qualification of products may be obtained from, OC-ALC/TICLA, 3001 Staff Drive, Tinker AFB, OK 73145-5990. 6.4 Subject term nt
40、ev word) listing. Breathing oxygen Capacitance Container, inner Container, outer Delivery rate Dewar Element, sensing Evaporation loss Gunfue Life support LOX Valve, fill-buildup-vent Valve, pressure closing Valve, pressure relief Vibration 6.5 Changes from Iirevious issue. Marginal notations are no
41、t used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-X O z W o 3 I- J o- E 4 W J m 3 O O - - .o0 I fl IL - D TI - 25 b t E 15 m 93qOb
42、 2005836 2T3 MIL-DTL-2566615 TABLE I. Bsmpe curve for converte r vibratiqn I i io o1 Frequency, CPS 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-V MIL-DTL-25666/5 19 MAX. - r FULL LG DESIGN OPT/ON!L FIGURE 1. Converter assemblv 7 Provided by IHS
43、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-DTL-25666/5 U 9993?5 2005838 076 MIL-DTL-2566615 TYP-L- Of MOUNT/Nc BAST OPT.ONAL 70 CONTRACTOR; OR A TR/AhGULAR fPAME. /THER T#REE MUUHTING LEGS 6% A MOUffT/NG R/ffG I FIGURE 2. Bottom vi ew 8 Provided by IHSNot
44、for ResaleNo reproduction or networking permitted without license from IHS-,-,-70 5i r I I l FIGURE 3. Schematic dia- m 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TYP/CAL TGT POINT O 5 10 15 20 25 RANGE FOR TEST POINT TvmcaL 303.5 332.5 36 1.5
45、 390.4 419.4 448.4 Quantity of iiquid oxygen, liters t Liauid oxygen (liters) I Nominal capacitance (pf) I FIGURE 4. ReiationshiD beween caDaciance and volume of oxyeen sensed 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Custodian: Air Force - 99 Reviewer: Air Force - 11 Preparing activity: Air Force - 71 Agent: Air Force - 99 Project 1660-F683 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
