1、F-D9-03 SAE MAP*4053 89 m 8357340 004Li512 O EM The Engineering Society AEROSPACE MAP 4053 A EFor Advancing Mobility -Land Sea Air and Space, RECOMMENDED Issued 10-31-89 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096 PRACTICE Submitted for recognition as an American National Standard UNIFORM MEASUREME
2、NT UNITS FOR LEAKAGE RATES 1. PURPOSE: This MAP is intended to set forth standardized measurement units for the eventual replacement of the variety of fluid leakage rate measurement units now in use. 2. SCOPE: Applications include specifications, reports, ratings, texts, etc., where fluid leakage ra
3、tes are treated. 3. APPLICABLE DOCUMENTS: SAE 3916A - Rules for SAE Use of SI (Metric) Units ANSI 2210.1 - Metric Practice Guide (American National Standard, 1973 American National Standards Institute -1 ASTM Document E380-72 4. SPECIFIC REOUIREMENTS: This MAP recommends that units of mg/s (milligra
4、ms per second) be universally used for measurement of fluid leakage through containment barriers. SAETechnical 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 an
5、d suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least written comments and suggestions. Society of Automotive Engineers, Copyright 1 989 All rights reserved. D r 7 every Inc. five
6、 years P at which time it may be reaffirmed, revised, or cancelled. SAE invites your Printed in U.S.A. COPYRIGHT SAE International (Society of Automotive Engineers, Inc)Licensed by Information Handling ServicesSAE MAP*4053 89 83573YO OOYY513 2 .I - MAP 4053 I Page 2 5. 6. .G E NE RA L-NOIE S. : Curr
7、ently, leakage rates are treated in a wide variety of measurement units for reasons of practice or direct relation to instrumentation readout. There is a need for standardized terminology for expressing and comparing leakage rales. In SI (metric) terms, it would be logical to use massltime units of
8、kg/s (kilograms per second). when applied to commonly used liquid and gaseous leakage rates. For example, he1 ium leakage rates across precision valve seats or ermeatng through E-04 range. Using kg/s units, these would be In the range of E-13 to E-07. A higher range, as exemplified by allowable seat
9、 leakage for a current aircraft refuel shutoff valve is 60 cm3/min. In kgls terms, this would be E-04. Therefore, commonly used leakages fall within the range of E-12 to E-84. Such low numbers are relatively awkward to handle. A prefix raising the exponent by a multiple of six has been selected. Thi
10、s results in the term mgls for uniform expression of leakage rates. Most practical leakages will fall within the range of E-O6 to Et.02. However, this results in a very small number materials, are currently expressed as “atmospheric cm s /SI in the E-10 to In gas leakage rate measurement, volumetric
11、 units are commonly employed, relating directly to contemporary instrumentation. However, this requires reference to “standard“ temperatures and pressures, which are not universal ly accepted. Conversion to massltime units after measurement is relatively simple and avoid the need for knowledge of ls
12、tandard“ conditions. Gas, liquid, and vapor leakage rates through barriers, components and systems vary wldely in character and magnitude. An individual leakage may simultaneously involve liquid and gaseous states of one or a combination of fluida. One or more leakage principles may be acting (molec
13、ular, viscous). Again, mass/time units provide for logical measurement of each situation. Use of this MAP does not imply necessity of change in existing calculation, co?trol, or measurement of leakage rates; nor does it suggest any particular interval for leakage rate testing, since some instrumenta
14、tion yields Instantaneous readings while others may require measurement over some definite time interval. However, final leakage rates should be converted from the various original units in to the standard mgls. C LAS-SIEI.CAT3 : A useful system for classifying the range of any fluid leakage rate is
15、 based on the SI notation decade exponent. For example: SAE Standard Decade Typical Leakage Rate Leakage Rate Range of Class in the Class Cla s-s - mu/s P A 1 lo1 (R102 6.0 E+01 8 10 RlO1 1 .o E+OO -1 10-lRlOo 2.5 E-O 1 -5 10-10- 9.9 E-O5 COPYRIGHT SAE International (Society of Automotive Engineers,
16、 Inc)Licensed by Information Handling ServicesSAE MAP*Ll053 89 W 8357340 004L(5LL( Ll II Page 3 MAP 4053 7. CONVERSION METHODS:. When converting leakage rates from various units to mg/s, the applicable be useful. Conversion factors are listed, along documents of section 3 will with instructions for
17、use. Examples of typical convers CONVERSION FACTORS on mathematics follow: OR1 GI NAL CONVERSION TEST MEASURED DENSITY OR FACTOR FLUID UNITS VOLUME MASS TIME PREFIX mu/ku to mg/s WATER aal/h x 3.785 E-O3 x 1.000 E+03 + 3.600 Et03 x 1.000 E+06 = 1.05 E+03 MIL-H-5606 cm3/min x 1,000 E-O6 x 8.6 E+O2 +
18、6.000 E+01 x 1 .O00 E+06 = 1.4 E+01 JP-4 cm3/min x 1.000 E-O6 x 7.8 E+02 + 6.000 E+01 x 1.000 E+06 = 1.3 E+01 boa 1 b/day 4.536 E-O1 + 8.640 E+04 x 1.000 E+06 = 5.25 E+OO AIR *in3/min x 1.639 E-O6 x 1.22 E+OO + 6.000 E+01 x 1.000 E+06 = 3.33 E-O1 HELIUM *cm3/sec x 1.000 E-O6 x 1.69 E-O1 x 1.000 E+06
19、 = 1.69 E-O1 TYPICAL CONVERSION OF DATA SAE STANDARD MEASURED LEAKAGE TEST LEAKAGE RATE CONVERSION RATE FLUID in various units FACTOR mg/s CLASS WATER 5.0 1.05 E+03 5.2 E+03 3 MIL-H-5606 5.0 1.4 E+01 7.0 E+01 1 3 cm /min JP-4 0.50 1.3 E+01 6.5 E+OO O cm5/mi n 1 b/dav *i n3/min 0.001 5.25 E+OO 5.2 E-
20、O3 -3 N24 AIR 1.5 3.33 E-O1 5.0 E-O1 -1 HELIUM 2.6 X 10-5 1.69 E-O1 4. E-O6 -6 3 *cm /sec 2 *Ref: Pressure 14.7 lbf/in (absolute) Temperature 70F PREPARED BY SAE COMMITTEE AE-5, AEROSPACE FUEL, OIL AND OXIDIZER SYSTEMS COPYRIGHT SAE International (Society of Automotive Engineers, Inc)Licensed by Information Handling Services
