1、AEROSPACERECOMMENDED PRACTICEARP5794Issued 2014-10Centrifugal Aircraft Fuel Pump Requirements,Design and Testing, Aerospace StandardRATIONALEThis Aerospace Recommended Practice is intended to provide general guidelines for the design, development, and qualification of aircraft mounted, centrifugal t
2、ype, fuel booster pumps.TABLE OF CONTENTS1. SCOPE 41.1 Purpose. 42. APPLICABLE DOCUMENTS 42.1 SAE Publications. 42.2 ASME 52.3 Military. 52.4 Other . 63. REQUIREMENTS . 63.1 Detail Specification 63.1.1 Fuels 63.1.2 Temperature 73.1.3 Input Power . 73.2 Performance 73.2.1 Sea Level Performance. 73.2.
3、2 Altitude Performance. 73.2.3 Altitude Climb Performance 73.2.4 High Temperature Performance . 73.2.5 Low Temperature Performance 83.2.6 Reprime Requirements . 83.2.7 Negative G and Inverted Operation 83.2.8 Start-up . 83.2.9 Pump Down. 83.2.10 Variations in Power Input 83.3 Design . 93.3.1 Envelop
4、e and Weight 93.3.2 Components 93.3.3 Standards and Specifications . 93.3.4 Materials and Processes. 93.3.5 Lubrication. 103.3.6 Thermal Safety 103.3.7 Stop and Restart . 113.3.8 Inrush Current . 113.3.9 Electrical Fault Containment . 11_SAE Technical Standards Board Rules provide that: “This report
5、 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 therefrom, is the sole responsibility of the user.”SAE reviews each t
6、echnical 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 2014 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or trans
7、mitted, 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: +1 724-776-4970 (outside USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB
8、ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/ARP5794 SAE INTERNATIONAL ARP5794 Page 2 of 283.3.10 Motor Passages and Vents. 11 3.3.11 Electrical Insulation Resistance 12 3.3.12 Electrical Dielectric St
9、rength . 12 3.3.13 Electromagnetic Compatibility. 12 3.3.14 Electrical Bonding Resistance 12 3.3.15 Case Ground. 12 3.3.16 Inlet 12 3.3.17 Outlet. 12 3.3.18 Dry Motor Pump Drain 13 3.3.19 Threaded Connections 13 3.3.20 Pressure Requirements 13 3.3.21 Safety and Maintainability . 14 3.3.22 Reliabilit
10、y and Maintainability 14 3.3.23 Interchangeability 14 3.3.24 Nameplate. 14 3.3.25 Age Control . 14 3.3.26 Workmanship 14 3.3.27 Operational Service Life 15 4. QUALITY ASSURANCE PROVISIONS 15 4.1 Inspection 15 4.1.1 Responsibility for Inspection . 15 4.1.2 Classification of Inspections 15 4.2 Tests 1
11、5 4.2.1 Responsibility for Tests. 15 4.2.2 Classification of Tests . 15 4.2.3 Test Reports 18 4.2.4 Test Samples for the Procuring Activity 18 4.3 Qualification Test Methods . 18 4.3.1 Test Fluid 18 4.3.2 Examination of Product. 18 4.3.3 Break-in-Run . 18 4.3.4 Leakage 18 4.3.5 Calibration . 19 4.3.
12、6 Blocked Inlet Screen . 19 4.3.7 Pump Down. 19 4.3.8 Reprime. 19 4.3.9 Negative G and Inverted Operation 20 4.3.10 Suction Feed . 20 4.3.11 Altitude Performance. 20 4.3.12 Vibration 21 4.3.13 Shock 21 4.3.14 Environmental Tests . 21 4.3.15 Fungus Resistance . 21 4.3.16 Endurance Test. 21 4.3.17 Dua
13、l or Variable Speed Pumps. 22 4.3.18 Dry Run . 22 4.3.19 Contaminated Fuel Endurance . 23 4.3.20 Power Input Tests . 23 4.3.21 Electrical Resistance. 24 4.3.22 Thermal Protectors 24 4.3.23 Electromagnetic Interference 24 4.3.24 Proof-of-Safety Tests 24 4.3.25 Water in the Fuel. 26 4.3.26 Lightning T
14、est 26 4.3.27 Disassembly and Inspection . 26 4.3.28 Safety, Reliability, and Maintainability. 26 5. PREPARATION FOR DELIVERY. 27 SAE INTERNATIONAL ARP5794 Page 3 of 286. NOTES 27 6.1 Intended Use. 27 6.2 Ordering Data 27 6.3 Data. 27 6.4 Drawings . 27 6.5 Inspection Data . 27 6.6 Technical Document
15、s 28 TABLE 1 ENDURANCE TEST CONDITIONS . 21TABLE 2 DIELECTRIC TEST VOLTAGES 24SAE INTERNATIONAL ARP5794 Page 4 of 281. SCOPEThis specification covers the general requirements for aircraft tank mounted, centrifugal type, fuel booster pumps, used for engine fuel feed and/or fuel transfer. 1.1 PurposeT
16、his document is intended to provide guidance and complement a Procuring Agency written detail specification for a given design application or use. This document was developed as the replacement document for MIL-P-5238C, which was made inactive in 1996.2. APPLICABLE DOCUMENTSThe following publication
17、s form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In theevent of conflict between the text of this document and references cited h
18、erein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (i
19、nside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AIR4246 Contaminants for Aircraft Turbine Engine Fuel System Component TestingAMS2175 Castings, Classification and Inspection ofAMS3216 Fluorocarbon (FKM) Rubber High Temperature - Fluid Resistant Low Compression Set 70 to 80AMS-A-211
20、80 Aluminum Alloy Castings, High StrengthAMS-P-5315 Acrylonitrile-butadiene (NBR) Rubber for Fuel-Resistant Seals 60 to 70AMS-QQ-P-416 Plating, Cadmium (Electrodeposited)AMS-R-83485 Rubber, Fluorocarbon Elastomer, Improved Performance at Low TemperaturesARP594 Fuel Pump Thermal Safety DesignARP1401
21、Aircraft Fuel System and Component Icing TestARP4754 Guidelines for Development of Civil Aircraft and SystemsARP4761 Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment.ARP5316 Storage of Elastomer Seals and Seal Assemblies Which Include an Ela
22、stomer Element Prior to Hardware AssemblyARP5580 Recommended Failure Modes and Effects Analysis (FMEA) Practices for Non-Automotive ApplicationsARP8615 Fuel System Components: General Specification ForSAE INTERNATIONAL ARP5794 Page 5 of 28AS5202 Port or Fitting End, Internal Straight Thread, Design
23、StandardAS5440 Hydraulic Systems, Military Aircraft, Design and Installation, Requirements ForAS8879 Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor DiameterAS50881 Wiring Aerospace VehicleJ1926-1 Connections for General Use and Fluid Power - Ports and Stud Ends with AS
24、ME B1.1 Threads and O-Ring Sealing - Part 1: Threaded Port with O-Ring Seal in Truncated Housing2.2 ASMEAvailable from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org.Y14.100 E
25、ngineering Drawing PracticesY14.24 Types and Applications of Engineering DrawingsY14.34 Associated ListsY14.35 Revision of Engineering Drawings and Associated Documents2.3 MilitaryAvailable from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6396,
26、http:/quicksearch.dla.mil/.MIL-P-5238 Pump, Centrifugal, Fuel Booster, Aircraft, General Specification ForMIL-H-8891 Hydraulic Systems, Manned Flight Vehicles, Type III Design, Installation and Data Requirements for, General Specification forMIL-S-7742 Screw Threads, Standard, Optimum Selected Serie
27、s, General Specification forMIL-V-7899 Valve, Check, Aircraft Fuel SystemMIL-DTL-25988 Rubber, Fluorosilicone Elastomer, Oil- however, if used in a hermetically sealed enclosure, fungicidal treatment will not be necessary.3.3.4.2 ElastomersElastomeric materials shall conform to AMS-P-5315, MIL-PRF-6
28、855, MIL-DTL-25988, AMS3216, or AMS-R-83485.3.3.4.3 WiringAll wiring shall be fuel resistant, and, other than windings, shall be in accordance with AS50881, or equivalent. 3.3.4.4 Metals and Surface TreatmentsMetals shall be of the corrosion-resistant type or suitably treated to resist corrosion due
29、 to fuels, standard fuel additives, fuel contaminates, FAME (Fatty Acid Methyl Ester), salt fog, or atmospheric conditions likely to be met in storage or normal service. The use of any protective coating that will crack or scale with age or extremes of climatic and environmental conditions shall be
30、avoided. The effect of surface treatments on material properties such as fatigue strength shall be considered.3.3.4.4.1 Dissimilar MetalsUnless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in
31、 MIL-STD-889.SAE INTERNATIONAL ARP5794 Page 10 of 283.3.4.4.2 Magnesium Magnesium or alloys thereof shall not be used in contact with fuel.3.3.4.4.3 CopperCopper shall not be used in contact with fuel except for stator electrical windings or rotors with suitable protective coating or DC commutators.
32、3.3.4.4.4 CadmiumCadmium shall not be used in contact with fuel, unless specifically approved for a specific application by the procuring agency. Where plating is used (not in contact with fuel) it shall be in accordance with AMS-QQ-P-416, Type II, Class 2.3.3.4.4.5 Aluminum CastingsAluminum casting
33、s shall be in accordance with AMS-A-21180 or other industry specifications. Inspection of castings shall be in accordance with AMS2175 or AMS-A-21180. Classification shall be determined based on application and approved by procuring activity. 3.3.4.4.6 Other CastingsOther castings shall be inspected
34、 in accordance with AMS2175, classification determined based on application and approved by procuring activity. 3.3.5 Lubrication The pump and motor assembly shall not require any scheduled maintenance for lubrication and shall be suitable for operation with all intended fluids. 3.3.6 Thermal Safety
35、3.3.6.1 Dry OperationThe pump shall be capable of dry running per the discussion below. The number and duration of dry run cycles, as well as the required test altitudes and ambient temperatures shall be defined by the procuring agency in the detail specification. The procuring agency shall also spe
36、cify the pre-dry run condition of the pump, such as transitioning from wet to dry (i.e.,pump down) or completely dry (i.e., installation of a new pump). Temperature limits of pump surfaces in contact with the aircraft structure shall be as specified in the detailed specification. Position of the che
37、ck valves (open or closed) on inlet and discharge ports is to be specified in detail specification.In systems where dry running is not anticipated or minimal, a dry run time of up to 100 hours may be specified. Recent fuel system advances including auto-shut off, fuel system management, or thermal t
38、emperature cutoffs, may preclude dry running as a normal operational mode. In systems where long dry running cycles are expected either as a normal operational condition or as a result of a single point (component or system) failure mode, a longer dry run time, up to 1000 hours, may be specified. Re
39、fer to ARP594 for information regarding design issues related to dry running. The detail specification shall explicitly state allowable limits of any deterioration in performance. In no case shall any dry run pump failure result in an unsafe failure mode or compromise pump safety compliance to FAA A
40、C 25.981-1C.Examples of unsafe failure modes are as follows:1. Any wear on surfaces which serve as part of the explosion proof path.2. A hot spot on the pump that could ignite the fuel vapors in the tank. The peak temperature shall not exceed 400 qF(204 C) on any portion of the housing in contact wi
41、th the unprotected fuel tank ullage or other flammable vapor zones. 3. Electrical failures such as failure of the insulation and wiring system. SAE INTERNATIONAL ARP5794 Page 11 of 283.3.6.2 Thermal Shut OffThe detail specification shall specify either non resetting thermal fuses or automatic resett
42、ing thermal shut off provisions.3.3.6.2.1 Non-Resetting Thermal FusesIf thermal fuses are required, they shall be integrally mounted to the critical location(s) on the stator where the hottest temperatures will result during operation based upon pump assembly orientation and variable fuel levels (ba
43、sed upon operating condition). The thermal fuses shall not be replaceable without replacement of the stator assembly. The activation temperature of the thermal fuse shall be chosen to prevent any exterior surface of the housing from reaching 400 F (204 C) in the event of a failure. One fuse shall be
44、 used for each AC motor phase. One fuse shall be used in DC motor driven pumps.3.3.6.2.2 Automatic Resetting Thermal Shut OffWhere an integral automatic dry cut-off feature is required to meet the dry operation requirements of 3.3.6.1, it shall be capable of 10 000 cycles of operation without failur
45、e or causing degradation of pump performance. Thermal safety shall be in accordance with ARP594.3.3.7 Stop and RestartFor any design using electronic switching, the detail specification shall identify the design requirement for start and stop cycles. Stop is defined as power removed from the pump or
46、 the pump can be in standby mode with power applied.3.3.8 Inrush CurrentThe detail specification shall identify the allowable limits for inrush current magnitude and transient time when power is applied to the pump assembly.3.3.9 Electrical Fault ContainmentAll internal pump electrical components, i
47、ncluding wiring, shall be contained within the explosion proof enclosure of the pump or motor assembly. The enclosure(s) shall be capable of containing any internal fault without failure of the enclosure(s). An electrical short or internal explosion shall not propagate to the outside of the housing
48、or generate an unsafe condition. The fuel pump shall meet the explosion containment / protection requirements of 4.3.24.1. Thermal protection shall be incorporated to assure that the electric pump assembly is maintained within safe temperature limits under all operating or non-operating conditions.
49、The peak temperature for any portion of the outside of the explosion proof portion of the assembly due to electrical heating, shall not exceed 400 F (204 C) or as required in the detail specification. Refer to ARP594 for discussion and guidelines.Any wiring external to the pump assembly but inside the fuel tank cavity or other flammable zones shall be chosen
