1、T NIL-V-24272B 4 9999906 0274748 5 400 1500 3000 6000 10 40 75 150 so that flow o 9 -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24272B Li manufacturers name, PMR11GH-2, and so forth). In addition to the subassembly drawings, a drawing of
2、 the manifold block (not necessarily in cross-section) shall be required. affixed parts as identification plates and studs, the block may be included in the drawings of the subassemblies which they attach. The internal parts details shall be included either with the asso- The model designation shall
3、 uniquely define This shall include only the block plus such permanently Capscrews threading into 3.6.2 Technical manuals. In addition to the general requirements specified in the data ordering document (see 6.2.2), the following shall be included as part of the manual contents. (a) The engineering
4、drawings for the valve (including certification data sheet). These drawings shall be supplemented by additional illustrations where necessary to adequately illustrate operation and maintenance. blowouts, partial or full sections, and so forth, and may eliminate extraneous lines and details to clarif
5、y the interaction of parts. alent procedures) for making up all joints and threaded assemblies. providing procedures for the complete disassembly and reassembly of the equipment, maintenance and troubleshooting sections shall contain, or refer to, only the limited disassembly and reassembly required
6、 to accomplish each particular operation. to reduce the possibility of unnecessary disassembly and unnecessary disturbance of adjustments when performing specific or limited maintenance or troubleshooting operations. These additional illustrations may consist of (b) (c) Detailed disassembly and reas
7、sembly procedures. In addition to Table listing wrench sizes and assembly torques (or other equiv- This is intended (d) Adjustment procedures. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract or purchase order, the contractor is responsi
8、ble for the performance of all inspection requirements as specified herein. in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government res
9、erves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as otherwise specified 13 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
10、ut license from IHS-,-,-4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of th
11、e responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. The inspection set forth in
12、 this specification shall Sampling in quality conformance does not authorize submission of I 4.5 Examination. 4.2 Classification of inspection. The inspection requirements specified herein are classified as follows: (a) (b) First article inspection (see 4.3). Quality conformance inspection (see 4.4)
13、. 4.3 First: article inspection. First article inspection shall consist of The the examination of 4.5.1 and the tests specified in 4.6.1 through 4.6.19. manifold assembly submitted for first article inspection shall be accompanied by the following items: (a) Internal replaceable trim; poppets, sprin
14、gs, filter elements, (b) Nonmetallic parts: O-rings, seating inserts, gaskets, and so (e) (d) (e) and so forth - one complete set per manifold. forth - two complete sets per manifold, Special tools required for installation, operation and maintenance - one complete set per manifold. Instruction book
15、 or preliminary technical manual for installation, operation and maintenance - one per manifold. Drawings of test manifold in accordance with 3.6.1. 4.3.1 First article test pr0cedure.s. Procedures covering all tests and inspections to be conducted for first article shall be prepared in accordance w
16、ith the data ordering documents specified (see 6.2.2). 4.3.2 First article inspection report. A first article inspection report shall be prepared in accordance with the data ordering documents epecif ied (see 6.2 . 2) . 4.4 Quality conformance inspection. Each production manifold shall be examined a
17、s specified in 4.5.2 and tested as specified in 4.6.1, 4.6.4, 4.6.8, 46.9, 4.6.10, 4.6.11 and 4.6.14. Any discrepancies or failures shall be corrected prior to acceptance. with the data ordering document included in the contract or order (see 6.2.2). Test reports shall be prepared in accordance 4.5.
18、1 First article examination. Upon receipt of the first srticle, it shall be disassembled and visually examined to determine conformance with the requirement6 of this specification. On reassembly, all nonmetallic parts, except the end connection O-rings, shall be replaced with spares, randomly select
19、ed from those provided with the manifold. entirely by test personnel using only the technical manual supplied with the manifold for guidance. This shall be accomplished 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2Ll272B Ll 7773906 027LI
20、762 T MIL-V-24272B(SH) 4.5.2 Quality conformance examination. The manifold shall be examined to determine conformance with the requirements as specified i.n 3.2, 3.3 and 3.4. Examination shall be limited to external examination without disassembly. 4.6 Tests. 4.6.1 Proof, Each portion of the manifol
21、d (that is upstream and downstream of the regulator cutout valve) shall be proof tested at the applicable pressure specified in 3.4.2. Pressure shall be applied for 2 minutes, depressurized and pressure applied again for 2 minutes. Water, nitrogen or air may be used. distortion or structural failure
22、. There shall be no external leakage, permanent 4.6.2 High-impact shock. The manifold shall be subjected to and meet the high-impact shock tests for grade A, class I as specified in MIL-S-901 pressurized with water, air or nitrogen. to the manifold or any sub-components. There shall be no degradatio
23、n to the performame capability of the manifold. There shall bo no structural damage 4.6.3 Vibration. The manifold shall be vibration tested in accordance There with type I of MIL-STD-167-1 pressurized with water, air or nitrogen. shall be no resonance in the range of frequency tested. structural dam
24、age or degradation to the performance capability of the Ilianifold. There shall be no 4.6.4 Accuracy of regulation. The manifold shall be tested for accuracy of regulation at each inlet pressure/set pressure combination defined below. Flow rate at each condition shall be varied over the full operati
25、ng range as specified in 6.2.1: Condition Inlet pressure Set pressure A Maximum B Minimum C Minimum D Maximum E Maximum F Minimum Minimum Minimum Mid-poin t Mid-point Maximum Maximum During each sequence (conditions A-B, C-D, and E-F) no alteration shall be made to the set pressure adjustment, or an
26、y other portion of the manifold, and regulated pressure delivered shall be maintained within the band as shown on figure 3. There shall be no instability or other evidence of unsatisfactory operation of the manifold during these tests. 4.6.5 Accumulation. The relief valve shall be tested for accumul
27、ation A maximum rated inlet pressure shall be maintained capacity under both the condition of a full-open regulating valve and a full-open by-pass valve. at the manifold inlet during this test. For the regulator portion, close by-pass valve and block, or otherwise modify, regulating valve to the wid
28、e-open fail condition. be isolated and the by-pass valve fully opened. downstream pressure rise shall not exceed the allowable shown on figure 4. For the by-pass valve portion, the regulator shall Under either condition, 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without
29、 license from IHS-,-,-MIL-V-24272B (SH) 4.6.6 Manual by-pass valve functional. Minimum inlet pressure shall be maintained at manifold inlet. Regulators shall be isolated. By-pass valve shall be open until highest sat pressure is maintained at maximum-flow demand. Increase inlet pressure to maximum,
30、then vary flow demand throughout the flow range of the manifold and verify ability of the by-pass valve to permit maintaining delivered pressure at set point in smooth accurate manner with good resolution. Operating torques shall not exceed those Specified in 3.4.11.3. 4.6.6.1 Manual by-pass valve c
31、yclic. With maximum pressure rating upstream, the manual by-pass valve shall be cycled 1,000 times. be no degradation to performance or evidence of damage or excesfiive wear. There shall 4.6.7 Hand-valve pressurization rate and functional. With maximun: pressure rating upstream, and a depressurized
32、downstream volume as specified in 3.4.11.3.1, each hand-operated valve shall be operated in accordance with the operating instructions affixed to the manifold to demonstrate its ability to meet the pressure buildup rate as specified in 3.4.11,3.1. torques shall not exceed those specified in 3.4.11.3
33、. Operating 4.6.8 Relief valve operating. Pressure at the relief valve inlet shall be increased until the relief valve lifts. Pressure shall then be decreased f i 16 until the relief valve reseats. At all times, liEt pressure shall not deviate by more than 2 lb/in2, or 2 percent, whichever is greate
34、r, and reseat shall be within the envelope shown on Eigure 4. the relief valve. This sequence shall be repeated 10 times. There shall be no evidence of operation instability or damage to 4.6.9 Seat-tightnese. Hand valves shall be seated with a torque not exceeding that specified in MIL-V-24109 or MI
35、L-V-22687, as applicable. Air, at the kigheet operating pressure each valve is subjected to in service, shall be used for leakage tests, using bubble fluid or immersing the outlet, or a line from the outlet, under water. The hand valves wed for isolation at the outlet of each regulating valve shall
36、also be tested in the outlet-to-inlet direction, applying a pressure at the outlet of the valve equal to the maximum outlet-section rating of tho manifold. Regulating valves shall be tested with an inlet pressure equal to the manifold rating. Relief valves shall be tested at tho reseat pressure appl
37、icable to their setting. None of the valves shall show visible evidence of leakage over a 5-minute period, The following procedure shall be used to check regulating valve seat tightness: exact set-point shall be determined by the accuracy of regulation test. shall then be isolated downstream. lia33.
38、 not exceed 10 diameters of downstream pipe. bubble-fluid to amura tightness. With full-rated nlet pressure, outlet pressure shall not rise above initial set lock-up checking over a 1-hour period. Initial lock-up shall not exceed that shown on figure 3 for the previously determined set-point, The va
39、lves It The dead-ended volume shall be tight and It shall be monitored with 4.6.10 External leakage. Air shall be applied at the appropriate maximum rating to each section of the manifold. fluid or submerging manifold in water. n !+minute period. Leakage shall be checked using bubble There shall be
40、no visible leakage over Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-242728 4 7779706 02747bli 3 M 4.6.11 Filter element bubble point. Test filter element for integrity and micrometer rating using the bubble-point test in accordance with MIL
41、-F-8815. Initial bubble-point valve shall be not less than 4.5 inches of water for 400 lb/in2 rated manifolds and 13 inches of water for 1500, 3000 and 6000 lb/in2 rated manifolds. Where the type of filter used is not compatible with this test method, alternative procedures may be used where authori
42、zed by NAVSEA. 4.6.12 Filter element strength. Apply a pressure differential equal to the maximum pressure rating of the manifold across the filter element for 2 minutes. There shall be no structural damage to the filter element or media migration, 4.6.13 Filter element flow-surge. Apply a flow-surg
43、e across the filter element by pressuring the inlet side with a pressure equal to the maximum rating of the manifold. This shall be followed by depressurization to atmospheric pressure. The pressurization and depressurization phases shall each occur in 1 second or less. Repeat until 100 pressurizati
44、on-depressurization cycles are completed. There shall be no structural damage to the filter element or media migration. 4.6.14 Filter operational. The filter shall be tested to determine the clean pressure drop across the element at rated flow. Pressure drop shall not exceed that specified in 3.4.11
45、.5. Pressure drop shall then be increased to verify proper operation of the differential pressure indicator. 4.6.15 Cleanability. The filter shall be subjected to sufficient contamination so that flow requirements cannot be met. It shall then be cleaned by the technical manual procedures specified b
46、y the manufacturer to demonstrate cleanability. After cleaning, the element shall be capable of meeting the applicable flow and pressure drop criteria. 4.6.16 Dome integrity (for dome loaded type regulators), Charge dome with 100 percent helium to give mid-range set point. Cycle valve over its full
47、stroke at a rate of approximately five cycles per minute for 8 hours. Measure leakage from dome every 2 hours using a mass spectrometer. Detected leakage shall not exceed a rate which will cause regulated pressure to shift out of the specification performance envelope in a period of less than 1 year
48、. This test is intended to verify ability of the manifold to perform within specification limits over periods of at least 1 year without requiring any adj us tment . 4.6.17 Pressure reversal. The manifold shall be tested to determine the susceptibility to damage when subjected to pressure reversal a
49、s specified in 3.4.11.1.4. It shall be set up with maximum inlet pressure and maximum set pressure. A separate means shall be included to insure that there is no loss of downstrean: pressure during this test. Load shall then be removed from the regulator set-point mechanism (if the regulator is spring loaded, back off all spring compression, if it is gas dome loaded, the dome charge shall be released). This condition (no load on the regulator set point mechanism, maximum set pressu
