1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/MA2151 AEROSPACE STANDARD MA2151 Issued 1994-03 Reaffirmed 2015-08 Clamp Assembli
5、es, Saddle or Omega Style, Two Point Mount, Multiple Shapes, Metric RATIONALE MA2151 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:1.1 This aerospace specification establishes the requirements for metric saddle or omega style clamps used for systems installation in aer
6、ospace equipment.1.2 Product Classification:The clamp assemblies covered by this document all incorporate two mounting points, but vary in shape.1.3 Field of Application:Use of these clamp assemblies is primarily for the support of fluid systems tubing and components but may be used for other genera
7、l purpose applications such as wire, cable, wave guide tubes, and system grounding, as determined applicable by the design activity. Installation and selection is recommended per ARP1897.2. REFERENCES:2.1 Applicable Documents:The following documents form a part of this document to the extent specifi
8、ed herein. The latest issue of Aerospace Material Specifications (AMS), Metric Aerospace Standards (MA), and Aerospace Recommended Practices (ARP) shall apply.SAE INTERNATIONAL MA2151 Page 2 of 14 2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-001.AMS 5510 W
9、rought, Corrosion, and Heat Resistant Alloy, Sheet, Strip, and Plate, 18Cr, 10.5Ni, 0.40Ti, Solution Heat TreatedAMS 4944 Titanium Alloy, Tubing, Seamless, Hydraulic, 3.0Al, 2.5V, Cold Worked and Stress RelievedAMS 4945 Tubing, Seamless, Hydraulic, 3.0Al, 2.5V, Texture Controlled, 105,000 psi (724 M
10、Pa) Yield StrengthAS478 Identification Marking MethodsARP1527 Color Coding, Elastomers for Tube Clamp CushionsARP1897 Clamp Selection and Installation GuideMA2151/1 Clamp, Saddle Type, Cushioned, Hydrocarbon Fluid Resistant, MetricMA2151/2 Clamp, Saddle Type, Cushioned, Phosphate Ester Fluid Resista
11、nt, MetricMA2151/3 Clamp, Saddle Type, Cushioned, High Temperature, MetricMA2151/4 Clamp, Saddle Type, Cushioned, PTFE, MetricMA2154/1 Clamp, Rectangular, 2 Piece, Cushioned with Wedges, Hydrocarbon Fluid Resistant, MetricMA2154/2 Clamp, Rectangular, 2 Piece, Cushioned with Wedges, Phosphate Ester F
12、luid Resistant, MetricMA2154/3 Clamp, Rectangular, 2 Piece, Cushioned with Wedges, High Temperature, Metric2.1.2 ASTM Publications: Available from American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM A 582 Free Machining Stainless Steel and Heat-Resisting St
13、eel Bars, Hot-Rolled or Cold-FinishedASTM D 395 Rubber Property, Compression SetASTM D 412 Rubber Properties in TensionASTM D 471 Rubber Property, Effect of LiquidsASTM D 624 Rubber Property, Tear ResistanceASTM D 1149 Rubber Deterioration - Surface Ozone Cracking in a Chamber (Flat Specimen)ASTM D
14、2240 Rubber Property - Durometer HardnessASTM D 3182 Rubber - Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanizing Sheets2.1.3 U.S. Government Publications: Available from Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadel
15、phia, PA 19111-5094.A-A-711 Dry Cleaning SolventQQ-P-35 Passivation Treatments for Corrosion Resisting SteelPPP-B-566 Box, Folding, PaperboardPPP-B-576 Box, Wood, Cleated, Veneer, Paper OverlaidPPP-B-585 Box, Wood, WireboundPPP-B-591 Boxes, Shipping, Fiberboard, Wood CleatedSAE INTERNATIONAL MA2151
16、Page 3 of 14 2.1.3 (Continued):PPP-B-601 Boxes, Wood, Cleated PlywoodPPP-B-621 Box, Wood, Nailed and Locked-CornerPPP-B-636 Box, Shipping, FiberboardPPP-B-640 Box, Fiberboard, Corrugated, Triple-WallPPP-B-665 Boxes, Paperboard, Metal Edged and ComponentsPPP-B-676 Boxes, SetupMIL-P-116 Preservation,
17、Methods ofMIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and OrdnanceMIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5MIL-H-6088 Heat Treatment of Aluminum Alloys, Process forMIL-H-6875 Heat Treatment of Steels (Aircraft Practice), Process forMIL-L-7808 Lubrication Oil, Aircraft
18、 Turbine Engine, Synthetic BaseMIL-H-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, AircraftMIL-I-23053 Insulation Sleeving, Electrical, Heat Shrinkable, General Specification forMIL-P-22241 Plastic Sheet (and film) Polytetrafluoroethylene (TFE - Fluorocarbon Resin)MIL-C-85449 Cl
19、amp Assembly, Saddle Type, Cushion, General Specification forMIL-STD-100 Engineering Drawing PracticesMIL-STD-105 Sampling Procedures and Tables for Inspection by AttributesMIL-STD-129 Marking for Shipment and StorageMIL-STD-831 Test Reports, Preparation of2.2 Order of Precedence:In the event of con
20、flict between the text of this document and the references cited herein, except Parts Standards, the text of this document shall take precedence.3. TECHNICAL REQUIREMENTS:3.1 Parts Standards:The individual item requirements shall be as specified herein and in accordance with the applicable part stan
21、dards. In the event of conflict between the requirements of this document and the part standard, the requirements of the part standard shall govern.3.2 Qualification:The items furnished under this document shall be same as products which have been subjected to and successfully passed the qualificati
22、ons specified in Section 4 of this document. Manufacturers qualified for document MIL-C-85449 need not requalify. Users of this specification are advised to control source approval(s) by standard page supplement sheet or similar means.SAE INTERNATIONAL MA2151 Page 4 of 14 3.2.1 The qualification req
23、uired by this document relates to qualification of the clamp only. It does not infer qualification of clamp installation techniques.3.3 Materials:Clamp band materials and cushioning material shall be as specified on the applicable part standard.3.4 Design and Fabrication:The design and construction
24、of the clamp shall be as specified herein and in accordance with the applicable part standard.3.4.1 Dimensions and Tolerances: Dimensions and tolerances shall be as specified on the applicable part standard.3.5 Performance:Clamp cushions, clamp bands, and clamp assemblies shall conform to the requir
25、ements of this document and the applicable part standard when subjected to the applicable tests specified in this document and the applicable part standard.3.5.1 Clamp Cushion Performance:3.5.1.1 Physical Properties: The cushion material shall meet the physical property requirements specified in the
26、 applicable part standard (see 4.5.3.1).3.5.1.2 Compression Test: The average compression set value of three cushion material specimens shall not exceed the value specified in the applicable part standard (see 4.5.3.2).3.5.1.3 Flammability: The cushion material shall be tested for flammability in ac
27、cordance with the applicable part standard and as specified herein (see 4.5.3.3).3.5.1.4 Titanium Compatibility: There shall be no evidence of cracking or pitting of the titanium tube specimen when observed with a 5 to 10 power magnifying glass (see 4.5.3.4).3.5.2 Clamp Band Performance:3.5.3 Clamp
28、Assembly Performance:3.5.3.1 Vibration: The clamps shall not exhibit any evidence of cushion separation or other deterioration. There shall be no cracking or separation of metal components. The transmissibility ratio shall be recorded (see 4.5.4.1.1). See the part standard for those parts requiring
29、vibration testing for qualification.SAE INTERNATIONAL MA2151 Page 5 of 14 3.5.3.2 Ozone Resistance (When Specified on Applicable Part Standard): The clamps shall not exhibit any evidence of cracking visible to the unaided eye or distortion of the cushion material (see 4.5.4.2).3.5.3.3 Thermal Shock:
30、 The clamps shall not exhibit evidence of cracking, tackiness, or degradation of the cushion material (see 4.5.4.4).3.6 Surface Texture:All surfaces shall have a smooth finish and be free from burrs and sharp edges. The inside edges of the clamp band shall be rolled or provided with a radius to elim
31、inate sharp edges.3.7 Identification of Product:3.7.1 Identification of Clamps: All clamps shall be marked as specified on the applicable part standard.3.8 Workmanship:Workmanship shall be of a sufficiently high grade to insure that clamps are of uniform quality and free from burrs, slivers, sharp e
32、dges, or other defects which would affect their service and shall be uniform in appearance without mold flash.4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Inspection:Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspe
33、ction requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use their own or any other facilities suitable for the performance of the inspection requirements specified herein.4.2 Classification of Inspection:The inspection requirements
34、specified herein are classified as follows:a. Qualification inspection (4.3)b. Quality conformance inspection (4.4)SAE INTERNATIONAL MA2151 Page 6 of 14 4.3 Qualification Inspection:4.3.1 Samples: Samples for qualification tests of clamps shall consist of the following number of clamps of each speci
35、fication sheet to be qualified.a. Size: -016, -020, -025, -032, -040, -045, -050, -056, -080b. Quantity: 17, 12, 22, 12, 12, 6, 6, 6, 11In addition 18 clamp cushion material slabs conforming to ASTM D 3182 for each type of cushion material to be tested shall be provided. Fabric reinforced cushion ma
36、terials for qualification must be supplied both with and without the fabric reinforcement molded into the slabs (18 slabs of each). The weave direction of the fabric reinforcement shall be identified.4.3.2 Inspection Routine: Sample units shall be subjected to qualification inspection specified in T
37、able 1 in the order specified, conducted on applicable specimens.TABLE 1 - Qualification Inspection4.3.3 Retention of Qualification: To retain qualification, the contractor shall forward samples for testing at intervals of not more than 2 years. The qualifying activity shall establish the initial re
38、porting date. The qualifying activity shall specify who will perform the following tests:a. Examination of product (4.5.2)b. Physical properties test (4.5.3.1)c. Vibration test (4.5.4.2), if applicableSAE INTERNATIONAL MA2151 Page 7 of 14 4.3.4 Identification of Samples: Samples for each dash number
39、 shall be separately packaged and forwarded to the testing facility specified by the qualifying activity. Samples shall be plainly identified by securely attached durable tags marked with the following information:a. Samples for qualification testb. Specification MA2151c. Clamp, assembly, saddle typ
40、e, cushionedd. Part standard part numbere. Manufacturers part numberf. Name of manufacturer/manufacturers FSCM or CAGE numberg. Submitted (date) under authorization (reference letter authorizing the test)4.3.5 Test Report: The contractor shall furnish the activity responsible for qualification with
41、a certified test report, in triplicate per MIL-STD-831 showing quantitive results for tests required by this specification. The report shall designate the part standard part number of the clamps submitted. The report shall also include the manufacturers drawing specifying the dimensions of the clamp
42、 in the open and in the closed position, and the manufacturer of the cushion material.4.4 Quality Conformance Inspection:Quality conformance inspection shall consist of the tests and inspections specified in Table 2, conducted in accordance with 4.4.2.TABLE 2 - Qualification Conformance Tests4.4.1 I
43、nspection Lot: An inspection lot shall consist of clamps for a particular size and material produced under essentially the same manufacturing conditions and presented for inspection at the same time.4.4.2 Sampling: A random sample shall be selected from each inspection lot in accordance with MIL-STD
44、-105. The inspection level and acceptable quality level (AQL) shall be as specified in Table 3. Cushion material test specimens shall be cut from clamp cushions and shall be of sufficient size to be tested in accordance with the applicable test methods of the applicable part standard. Tensile and el
45、ongation cushion material test specimens may be cut from larger size clamp cushions of the same inspection lot and shall be provided by the manufacturer.SAE INTERNATIONAL MA2151 Page 8 of 14 TABLE 3 - Classification of Defects4.5 Test Methods:4.5.1 Test Conditions:4.5.1.1 Environment: Unless otherwi
46、se specified, all testing shall be done at room temperature (15.6 to 32.2 C).4.5.1.2 Test Mandrels: Unless otherwise specified, all test mandrels shall be tool steel drill rod in accordance with ASTM A 582. Unless otherwise specified, all dimensions shall be as specified in Table 4 with surface text
47、ure of 0.8 mm maximum. Spacing A and B shall be as shown in Figure 1 (see 4.5.4.2).TABLE 4 - Test Mandrel Dimensions and Clamp SpacingSAE INTERNATIONAL MA2151 Page 9 of 14 FIGURE 1 - Flammability Test Setup (Typical)SAE INTERNATIONAL MA2151 Page 10 of 14 FIGURE 2 - Vibration and Transmissibility Tes
48、t Setup (see 4.5.4.1)4.5.2 Examination of Product: Clamps shall be carefully examined to determine compliance with the requirements of this document and applicable part standard with respect to material, workmanship, configuration, marking, and dimensions as specified in 3.4. Any variation beyond th
49、e dimensions, plus allowable tolerances, shall be classified as major or minor as indicated in Table 3.4.5.2.1 Examination of Product (Quality Conformance Testing): For quality conformance testing, examination of product shall consist of examining factors outlined in Tables 2 and 3.4.5.3 Clamp Cushion Tests:4.5.3.1 Physical Properties Tests: Tests shall be conducted in accordance with the test methods shown in the applicable part standard.
