1、 DETAIL SPECIFICATION CAP, FUEL TANK: FOR MILITARY COMBAT AND TACTICAL TRANSPORT VEHICLES Inactive for new design after 22 January 1999. This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers three types of f
2、uel tank caps intended for use on military vehicles. The type I and type II are vented, while the type III fuel tank cap is non-vented (see 6.1) 1.2 Classification. Fuel tank caps are of the following types as specified (see 6.2): Type I Vented cap with pressure relief valve and float assembly (MS51
3、300). Type II Vented cap with pressure relief valve and fording valve (MS35645). Type III Non-vented cap (MS53075). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other
4、sections of this standard or recommended 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 of documents cited in sections 3, 4, or 5 of this standard, whethe
5、r or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the soli
6、citation or contract. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of US Military Property. MS35644 - Filler Neck Assembly, Fuel Tank Military Vehicles. MS35645 - Cap, Fuel Tank: Tactical Vehicles, Fording. MS51300 - Cap, Fuel Tank: Combat Vehicle, Spill Proof. MS53075 - Cap,
7、 Fuel Tank: Tactical Vehicle Non-Vented. (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) AMSC N/A FSC 2910 Comments, suggestions, or questions on
8、 this document should be addressed to DLA, Land and Maritime, ATTN: VAI, P.O. Box 3990, Columbus, OH 43218-3990, or email to FluidFlowdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.
9、dla.mil. INCH-POUND MIL-DTL-45300C 20 July 2011 SUPERSEDING MIL-C-45300B 16 February 1988 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45300C 2 2.2 Other publications. The following document forms a part of this specification to the extent
10、 specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted shall be those listed in the issue of the DODISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS shall be the issue of the nongovernment docume
11、nts which is current on the date of the solicitation. INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 17025 - General requirements for the competence of testing and calibration laboratories (Copies of these documents are available online at http:/www.iso.ch or from the International Organiz
12、ation for Standardization American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036.) NCSL INTERNATIONAL NCSL Z540.3 - Laboratories, Calibration, and Measuring and Test Equipment (Copies of these documents are available online at http:/www.ncsli.org or from NCSL Inte
13、rnational 2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404) 2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in thi
14、s document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.4. 3.2 Materials (all types). Materials shall be as
15、 specified herein and in referenced specifications, standards and drawings. Materials shall be free of defects which adversely affect performance or serviceability of the finished product (see 4.6.1). 3.2.1 Recycled, virgin and reclaimed materials. There are no requirements for the exclusive use of
16、virgin materials. The use of recycled or reclaimed (recovered) materials is acceptable provided all other requirements of this specification are met (see 6.3.1). 3.3 Construction (all types) (see 4.6.1 and 4.6.2). 3.3.1 Type I. Type I caps shall conform to MS51300. 3.3.2 Type II. Type II caps shall
17、conform to MS35645. 3.3.3 Type III. Type III caps shall conform to MS53075. 3.4 Performance. 3.4.1 Torque. 3.4.1.1 Caps (all types). When connecting the cap to a filler neck conforming to MS35644 at temperatures of plus 125 to minus 65 degrees Fahrenheit (F), the torque shall be no greater than 70 i
18、nch-pounds attained before the cap hits the stop limit. The torque required to disconnect the cap from the filler neck at temperatures of plus 125 to minus 65F shall be not greater than 70 nor less than 25 inch-pounds. There shall be no visible evidence of binding (see 4.6.3.1). Provided by IHSNot f
19、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45300C 3 3.4.1.2 Fording valve (type II only). The torque required to move the fording valve out of closed or open position shall be not less than 10 inch-ounces (see 4.6.3.2). 3.4.2 Leakage (all types). When teste
20、d as specified in 4.6.4, with a pressure of 2 pounds per square inch (psi) for type I and 1 psi for type II (with fording value closed) and type III caps, the leakage shall not exceed 0.5 ounce per minute. 3.4.3 Pressure relief valve opening. 3.4.3.1 Type I. When tested as specified in 4.6.5.1, the
21、pressure relief valve for type I caps shall open at between 4 to 5 psi, when the float is in the actuated condition. 3.4.3.2 Type II. When tested as specified in 4.6.5.2, the pressure relief valve for type II caps shall open at between 2 to 3 psi, when the fording valve is in the closed position. 3.
22、4.4 Free breathing (types I and II). When tested as specified in 4.6.6, type I and type II caps (type II cap with fording valve open) shall have an air flow through them of not less than 0.010 cubic foot per minute (cfm), at room temperature with 1 psi vacuum. 3.4.5 Shear strength (all types). When
23、tested as specified in 4.6.7, type I and type II caps shall withstand not less than 25 foot-pounds of applied torque before showing any rotation of the inner member with respect to the outer shell. Type II and type III caps shall withstand not less than 25 foot-pounds of applied torque before showin
24、g any rotation of cup on inner plate or inner plate on shell. 3.4.6 External pressure (types II and III). When tested as specified in 4.6.8, type II (with fording valves closed) and type III caps shall not leak. 3.5 Finish (all types). Unless otherwise specified (see 6.2), caps shall be finished on
25、the interior or exterior as specified in the applicable MS standard (see 3.3 and 4.6.2). 3.6 Identification marking (all types). Caps shall be marked in accordance with the applicable MS standard and the requirements of MIL-STD-130 (see 3.3 and 4.6.2). 3.7 Cleaning. The caps and all cap parts in con
26、tact with fuel shall be cleaned. 3.8 Workmanship (all types). The workmanship of the cap shall be of such quality as to assure a product free of defects affecting its serviceability and appearance (see 4.6.2). 4. VERFICATION 4.1 Classification of inspections. The inspection requirements specified he
27、rein are classified as follows: a. First article inspection (see 4.2). b. Conformance inspection (see 4.5). 4.1.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient accuracy, quality and quantity to permit performance of the required inspec
28、tion shall be used. The establishment and maintenance of a calibration system to control the accuracy of the measuring and test equipment shall be in accordance with ISO 17025 and NCSL Z540.3 as applicable. 4.1.1.1 Component and material inspection. Components and materials shall be inspected in acc
29、ordance with all the requirements specified herein and in applicable documents. 4.2 First article inspection. First article inspection shall be performed on one complete cap assembly when a first article sample is required (see 3.1). This inspection shall include the examination of 4.4 and the tests
30、 of 4.5.1 through 4.5.3. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45300C 4 4.3 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be conducted under the following conditions: a. Air temperature 73 + 18F
31、b. Barometric pressure 28.5 + 2/ 3 inches mercury (Hg) c. Relative humidity 50 + 30% 4.3.1 Cleaning. The caps and all cap parts in contact with fuel shall be cleaned prior to tests. 4.3.2 Filler neck. When the use of a filler neck is specified during testing, the filler neck shall conform to MS35644
32、. 4.4 First article inspection. Unless otherwise specified (see 6.2), the Government shall select five (5) sample caps, of the specified type, produced under the production contract for first article inspection. First article samples shall be inspected as specified in table I. Approval of the first
33、article sample by the Government shall not relieve the contractor of his obligation to supply caps that are fully representative of those inspected as a first article sample. Any changes or deviation of the production units from the first article sample shall be subject to the approval of the contra
34、cting officer. The applicability of cap types to tests shall be as specified in table II. TABLE I. Classification of inspections. Title Requirement Inspection First article 1/ Conformance Examination Tests 1/ Materials and Construction Defects (see table III) Torque, cap Torque, fording Valve Leakag
35、e Pressure relief valve opening Free breathing Shear strength External pressure 3.2 and 3.3 3.3, 3.5 thru 3.8 3.4.1.1 3.4.1.2 3.4.2 3.4.3 3.4.4 3.4.5 3.4.6 4.6.1 4.6.2 4.6.3.1 4.6.3.2 4.6.4 4.6.5 4.6.6 4.6.7 4.6.8 X X X X X X X X X X X X X X X X X 1/ See table II. TABLE II. Applicability of cap type
36、s to tests. Tests Cap type I II III 4.6.3.1 4.6.3.2 4.6.4 4.6.5.1 4.6.5.2 4.6.6 4.6.7 4.6.8 X X X X X X X X X X X X X X X X Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45300C 5 4.4.1 First article inspection failure. A sample of parts sha
37、ll be randomly selected, as specified in table III. If one or more defects are found, the lot shall be re-screened and defects removed. After screening and removal of defects, a new sample of parts shall be randomly selected, as specified in table III. If one or more defects are found in the second
38、sample, the lot shall be rejected and shall not be supplied to this specification. Re-inspected lots shall be clearly identified. TABLE III. Conformance zero defect sampling plan. Lot size Sample size 2 to 8 5 9 to 15 5 16 to 25 5 26 to 50 5 51 to 90 7 91 to 150 11 151 to 280 13 281 to 500 16 501 to
39、 1,200 19 1,201 to 3,200 23 Over 3,200 29 4.5 Conformance inspection. 4.5.1 Sampling. 4.5.1.1 Lot formation. An inspection lot shall consist of all the caps of one type and part number, from an identifiable production periods from one manufacturer, submitted at one time for acceptance. 4.5.2 Examina
40、tion. 4.5.3 Tests. Sample caps selected as specified in 4.5.1 shall be subjected to the quality conformance tests specified in table I. 4.6 Methods of inspection. 4.6.1 Materials and construction (all types). Conformance to 3.2 and 3.3 shall be determined by inspection of contractor records providin
41、g proof or certification that design, construction, processing, and materials conform to requirements. Applicable records shall include drawings, specifications, design data, receiving inspection records, processing and quality control standards, vendor catalogs and certifications, industry standard
42、s, test reports, and rating data. 4.6.2 Defects (all types). Conformance to 3.3, 3.5, 3.6 and 3.7 shall be determined by examination for the defects listed in table III. Examination shall be visual or by measurement with standard inspection equipment. 4.6.3 Torque. 4.6.3.1 Caps (all types). To deter
43、mine conformance to 3.4.1.1, the cap shall be connected to and then disconnected from the filler neck using a torque wrench. This procedure shall be repeated five times, observing the torque required. In connecting the cap, the maximum torque value shall be attained before the cap reaches the end of
44、 travel. 4.6.3.2 Fording valve (type II only). To determine conformance to 3.4.1.2, actuate the fording valve control from the “opens” to the “closed” position and from the “closed to the “open” position, using a torque wrench and noting the torque required. Provided by IHSNot for ResaleNo reproduct
45、ion or networking permitted without license from IHS-,-,-MIL-DTL-45300C 6 4.6.4 Leakage (all types). To determine conformance to 3.4.2, a filler neck, with cap mounted, shall be placed in an airtight chamber (see figure 1). The chamber shall be 3/4 filled with a liquid of the viscosity of gasoline.
46、It shall be rotated to place the cap below the liquid level. An internal pressure of 2 psi shall be applied for type I and 1 psi for types 11 and III caps and any leakage shall be recorded. 4.6.5 Pressure relief valve opening. 4.6.5.1 Type 1. To determine conformance to 3.4.3.1, fabricate an air pre
47、ssure chamber from a MS35644 filler neck assembly. Gradually increase the air pressure to verify that the relief valve opens at 4 to 5 psig. The vent opening may be plugged with a rubber stopper. For safety reasons, the air supply system should be designed to preclude exceeding 10 psig. Since the ef
48、fective area of the relief valve is approximately 1 square inch, an equivalent mechanical force may be used in lieu of air pressure. Visually observe the relief valve opening with a 4 to 5 lb force applied to the ball chamber by a suitable means, such as a spring scale. 4.6.5.2 Type II. To determine
49、 conformance to 3.4.3.2, the cap shall be placed on a filler neck and the fording valve shall be closed. Internal pressure of the filler neck shall be increased at a rate not exceeding 0.1 psi per second until pressure relief valve opens at a maximum of 6 psi is obtained. 4.6.6 Free breathing (types I and II). To determine conformance to 3.4.4, the cap shall be installed on a filler neck that is mounted on testing apparatus conforming to f
