1、. . MIL-DTL-25bbb/2 Ob 2OObLL2 380 U IINCH-POUNDI MIL-DTL-2566612 (USAF) 15 Septe mber 1995 SUPERSEDING 27 March 1981 MIL-C-25781C (USAF) DETAIL SPEC1 FICATI ON CONVERTER, LIQUID OXYGEN GCU-3/A This specification is approved for use by the Department of the Air Force and is available for use by all
2、Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Score. This specification covers one type of converter. it provides storage and pressurization of 10 liters of liquid oxygen to 70 pounds per square inch gauge (psig), nominal pressure and does not have integral warming coils. The c
3、onverter is designated GCU-3A. 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 recommended f
4、or 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 Government
5、 docu ments. 2.2.1 SDecifications. and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index for Specifications and
6、Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-V-9050 MIL-C-25516 MIL-DTL-25666 Valves, Oxygen, Pressure Relief, Aircraft Connectors, Electrical, Miniature, Coaxial, Environment Resistant Type, Converters, Liquid Oxygen, Capac
7、itance Type Gauging, General Specification For General Specification For Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: OC-ALC/TICLA, 3001 Staff Drive, Tinker AFB, OK 73 145- 3037 by using the
8、self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA F5C 1660 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted wit
9、hout license from IHS-,-,-PlIL-DTL-2568bJ2 79999!l!6 20RhLL3 217 MIL-DTL-25666/2 STANDARDS DEPARTMENT OF DEFENSE M IL-STD- I 29 Marking for Shipment and Storage (Unless otherwise indicated, copies of federal and military specifications, and standards are available from the Standardization Documents
10、Order Desk, Building 4D, 700 Robbins Ave, Philadelphia, PA 191 1 1-5094) 2.3 Order 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 a
11、nd regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Oualification. The converters furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time set for opening of bi
12、ds (see 4.2 and 6.3). 3.2 Design and construction. The converter shall conform to figures I, 2 and 3. The converter shall have an operating pressure of 70 pounds per square inch gage (psig) and a minimum capacity of 10 liters of liquid oxygen measured at 1 atmosphere. 3.2.1 StrenPth. The filled conv
13、erter shall be designed to withstand the dynamic loads that are imposed by the following accelerations: Vertical (down) 14G Vertical (up) 6G Lateral 6G 3.2.2 Markine of vorts. The ports shall be marked as indicated in figure 1 3.2.3 Pressure relief valves. Tile pressure relief valves shall conform t
14、o type II of MIL-V-9050 and shall be of such size and shape to fit the over-all dimensions specified for the converter. 3.2.4 Weight. The weight of the converter shall not exceed 25 pounds. 3.3 Performance. 3.3.1 Final assembly pressure. The final assembly pressure of the converter shall be 95 psig.
15、 3.3.2 FillinP time. The time required to fill the converter shall not exceed 5 minutes. 3.3.3 Evaporation loss. 3.3.3.1 Vent condition. The evaporation loss of the essentially full converter in the vent condition shall not exceed 3 pounds of oxygen when tested as specified in MIL-DTL-25666. 3.3.3.2
16、 Buildup condition. The evaporation loss of the essentially full converter in the buildup condition shall not exceed 3 pounds of oxygen when tested as specified in MIL-DTL-25666. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25666/2 99999
17、06 20061L4 153 H MIL-DTL-25666/2 3.3.4 Buildup time. The time required for the converter to reach its operating pressure immediately after it has been filled shall not exceed 10 minutes. 3.3.5 Capacitance. The capacitance of the sensing element, after it is installed in the empty converter, shall be
18、 123.5 +1 .O picofarad (PF). 3.3.6 Inner vessel pressure. 3.3.6.1 inner vessel. The inner vessel shall meet the performance requirements for the inner vessel pressure test specified in MIL-DTL-25666 when subjected to a pressure of 200 psig. 3.3.6.2 Permanent volumetric expansion. The converter shall
19、 meet the performance requirements for permanent volumetric expansion as specified in MIL-DTL-25666 when subjected to a pneumatic or hydrostatic pressure of 200 psig . 3 3.7 Delivery rate. 3.3.7.1 Constant flow. The converter shall deliver a flow of gaseous oxygen at 72 +IO liters per minute for not
20、 less than i .5 hours with the operating pressure remaining between 70 and 80 psig after the first 15 minutes of flow. Pressures in the supply line shall remain between 55 psig and 105 psig during the entire period of flow. The flow at the specified rate shall be initiated within IO minutes after th
21、e converter has reached the operating pressure. The full test procedure is specified in MIL-DTL-25666. 3.3.7.2 Cvclic flow. The converter shall deliver oxygen as specified (see 3.4.7.1) for not less than 1.5 hours when tested as specified in MIL-DTL-25666. 3.3.8 Calibration. The capacitance sensing
22、element shall have characteristics that provide for a linear relationship between electrical capacitance and volume of liquid oxygen sensed. The relationship shall be in accordance with figure 4, using the equations that are specified (see 3.3.8. i) to determine tolerances. An example of the use of
23、these equations is as follows: If the actual quantity of liquid oxygen at the 6 liter test point is 6.1 liters, the measured capacitance must be between C minimum (miri) and C maximum (max). C min = 5.7 x 6.1 + 122.3 = 157. 1 PF C max = 5.9 x 6.1 + 124.7 = 160.7 PF 3.3.8. I Eauations. The following
24、equations shall be used to calculate the minimum and the maximum capacitances. Values less than 2 liters Values greater than 2 liters C min = 5.6 L + 122.5 C max = 6.0 L + 124.5 C min = 5.7 L + 122.3 C max = 5.9 L + 124.7 C = Capacitance in PF L = Exact quantity in liters of liquid at test point 3.3
25、.9 ODeratine temperature. The operating pressure shall remain between 70 and 85 psig after the first 15 minutes of flow at the low temperature and shall remain between 65 and 80 psig after the first IS minutes of flow at the high temperature. An intermittent increase or decrease of pressure is allow
26、able provided these variances do not exceed a 2 minute interval for any one pressure cycle. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25666/2 9997906 2006335 0T MIL-DTL-25666/2 3.3.10 m. 3.3.10.1 Vibration The converter shall not exhi
27、bit physical evidence of damage after completion of the vibration test 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
28、 - cvcling. The converter shall not exhibit physical evidence of damage after completion of the cycling portion of the vibration test specified (see 4.4. i. 3.4 Check valve. The check valve used in the system shall be designed to open at 5 +2 psig. 4. VERIFICATION 4.1 Classification of insuections.
29、The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2) b. Conformance inspection (see 4.3). 4.2 Oualification inspection. The qualification inspection shall consist of all of the methods of inspection that are d specified in MIL-DTL-25666. 4.3 C
30、onformance inmection. The conformance inspection shall be in accordance with MIL-DTL-25666. 4.4 Vibration. 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
31、 500 cps and return in a 15 minute cycle at an applied double amplitude of 0.036 inch or an applied acceleration of LlOG 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 Packaging. - Packaging requirements shall be as specified in
32、 the contract or order (see 6.2). 5.2 mg. Unless 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 10 liter, 70 psig converte
33、r covered by this specification is intended to be used on the F- 106AlB aircraft. 6.2 Orderine da ta. Procurement documents should speciQ the following: a. Title, number, and date of this specification. b. Issue of DODISS to be cited in the solicitation, and if required, the specific issue of indivi
34、dual documents referenced (see 2.1). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-DTL-25666/2 6.3 Oualification. With respect to products requiring qualification, awards will be made only for products which are, at the time of award of cont
35、ract, qualified for inclusion 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 F
36、ederal Government tested 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 73 145-599
37、0. 6.4 Subiect term (key word) listing. Breathing oxygen Capacitance Container, inner Container, outer Delivery rate Dewar Element, sensing Evaporation loss Gunfire Life support LOX Valve, fill-buildup-vent Valve, pressure closing Valve, pressure relief Vibration 6.5 Chanzes from previous issue. Mar
38、ginal notations are not 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-,-,- NIL-DTL-25666/2 W 9999906 2006117 962 MI L-DTL-25666/2 TA
39、BLE 1. Range curve for converter vibration I o z w O 3 I- J a x a m - - W J 3 O D J IO 20 30 50 500 Frequency, CPS 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-25666/2 Ob 200blL8 8T7 = M IL-DTL-2566612 45“+loTyp 318 ANFT intenial 1/4 AN
40、FT internai 1/8 ANFT I I MIL-C-255 16 B Polarity MIL-C-255 16 E Polarity- Dimensions in inches Tolerance on decimais - N.O3 1 L I Sphere &a 13.25 3.375 L 8.625 J Dia - 12.0 Max ,I Max Internai FIGURE 1. Top and fro nt view 7 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
41、t license from IHS-,-,- MIL-DTL-25bbb/2 W 9Ob 200blL 735 MIL-DTL-25666/2 - I 6.5 Sphereradmax - -I- 6.5 7.375 Sphere rad I I /I 3.3 I Dimensions in inches Tolerance on decimais -.O3 1 75 FIGURE 2. Side view 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
42、HS-,-,-MIL-DTL-25bbb/2 = 9Ob 2006320 g57 MIL-DTL-25666/2 GAS PRESSURE OPENING PRESSURE CLOSING VALVE CONNECTION CONNECTIONS VENT PRESSURE 4 RELIEF LIQUID OXYGEN EQUIPMENT I I I I I I -,I L-, GASEOUS OXYGEN SUPPLY i, CHECK VALVE -3 CONVERTER FIGURE 3. &natic diacl ram 9 Provided by IHSNot for ResaleN
43、o reproduction or networking permitted without license from IHS-,-,-200 180 160 140 120 - , f - 7 C mnx 4 U 158.3 pP 10 I N I h H 10 Liquid oxygen (liters) I Nominal capacitance (pf) O 123.5 I 2 I 135.1 4 146.7 I I 6 I 158.3 I I 8 I 169.9 IO 181.5 I I FIGURE 4. Re1atiwsh- ID betwee n caDwce and voli
44、ame of oxygen sensed 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. Custodian: Air Force - 99 Reviewer: Air Force - I i MIL-DTL-25666/2 E 9999906 2006322 22T MIL-DTL-25666/2 Preparing Activity: Air Force - 71 Agent: Air Force - 99 Project 1660-F677 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
