1、A S T I D2428 92 0759510 0515071 972 An American National Standard AMERICAN SOCIETY M R TESTING AND MATERIALS 1916 RaceSt Philadelphla,Pa 19103 Reprinted from the Annual Book of ACTM Standards.Copyright AsTh4 If Mt listed in the current comblned tndex,will appear in the next editlon.($Designation:D
2、2428-92 Standard Test Method for Simulative Recirculating System Testing of Aerospace Hydraulic Fluids1 This standard is issued under the fixed designation D 2428;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revi
3、sion.A number in parentheses indicates the year of last reapproval.A superscript epsilon(6)indicates an editorial change since the last revision or reapproval.1,Scope 1.1 This test method covers a procedure for system evaluation of aerospace hydraulic fluids.The test method recommends control of tes
4、t variables,a typical test system geometry,data to be obtained,and procedures which will assure a uniform approach to fluid screening and evaluation.Recommendations concerning specific hardware and rigid techniques have been avoided where possible to allow the test method to be used as the state-of-
5、the-art advances.1.2 Each agency using the test method can simulate a specific system,thus fluids can be qualified for use in applications having unique hardware and design concepts.This approach provides the test flexibility needed to meet the rapid changes in fluid requirements and also provide va
6、lu-able comparative data for both users and developers of hydraulic fluids.1,3 Since the test system was purposely generalized,it is important that the specified data be obtained in order that fluid flow dynamics can be defined.Such factors as shear rate,mass flow rate,temperature gradients,etc.,mus
7、t be defined for valid comparisons.1.4 This standard does not purport to address all o f the safety problems,if any,associated with its use.It is the responsibility o f the user ofthis standard to establish appro-priate sdety and health practices and determine the applica-bility o f regulatory limit
8、ations prior to use.1.5 The values stated in metric units are to be regarded as the standard,The values given in parentheses are for information only.2.Referenced Documents 2.1 ASTM Standards:D 88 Test Method for Saybolt Viscosity2 D92 Test Method for Fiash and Fire Points by Cleveland Open Cup3 D 9
9、7 Test Method for Pour Point of Petroleum Oils3 D445 Test Method for Kinematic Viscosity of Trans-parent and Opaque Liquids(and the Calculation of Dynamic Viscosity)D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration3 D941 Test Method for Density and Relative Density(S
10、pecific Gravity)of Liquids by Lipkin Bicapillary Pycnometer D974 Test Method for Acid and Base Number by Color-Indicator Titration D 1298 Practice for Density,Relative Density(Specific Gravity),or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method D 1480 Test Method fo
11、r Density and Relative Density(Specific Gravity)of Viscous Materials by Bingham Pycnometei3 D 1481 Test Method for Density and Relative Density(Specific Gravity)of Viscous Materials by Lipkin Bicapillary Pycnometer3 D 1533 Test Method for Water in Insulating Liquids(Karl Fischer Methd)D 2 i 55 Test
12、Method for Autoignition Temperature of Liquid Petroleum Products5 F 303 Practices for Sampling Aerospace Fluids from Components6 F 3 i 3 Test Method for Insoluble Contamination of Hy-draulic Fluids by Gravimetric Analysis7 3.Summary of Test Method 3.1 Hydraulic fluids are evaluated in a system which
13、 simulates as closely as practical that in which the fluid is to operate.System variables and test procedures have been purposely generalized while system description and data to be obtained have been rigidly defined.4.Significance and Use 4.1 The usefulness of this test method is related directly t
14、o the ability to correlate valid test results from different laboratories.Results validity and correlativity are related directly to the care with which data is obtained and reported as weil as instrumentation accuracy and test concept.4.2 Instrumentation accuracy is a function not only of resolutio
15、n but also placement in the system.4.2.1 Pressure piezometer rings are fabricated and placed in accordance with“Fluid Meters,Their Theory and Appli-cations,”ASME,1959,p.18.*Thermocouple probes are placed in the line to read the maximum fluid temperature.For inside-out heat flow this is generally at
16、the tube I This test method is under the jurisdiction of ASTM Committee D-2 on Petroleum Products and Lubricants and is the direct responsibility of Subcom-mittee D 02.1 I on Engineering Science of High Performance Fluids and Solids.Current edition approved a t.15,1992.Published December 1992.Originally published as D 2428-66 T.Last previous edition D 2428-86.Annual Book of ASTM Standards,Vol 04.04.Anniial Book ofASTMStandards,Vol 05.01.Annual B w k o f ASTM Siandards,Vol 10.03.Discontintied 198
