JIS-Z-8762-1988-ENG.pdf
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1、J I S Z*87b2 88 W 4933b08 0079822 T - J7- I UDC 532.575.52:532.575.53 JIS JAPANESE INDUSTRIAL STANDARD Measurement of Fluid Flow by Means of Orifice Plates, Nozzles and Venturi lubes JIS Z 8 7 6 2 - 1 9 8 8 Translated and Published by Japanese Standards Association Printed in Japan 48 S 1 Copyright
2、Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 06:32:04 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z*87b2 48 4933b08 0079823 I ! .- . . . . . . i . - . . - . .I
3、In the event of any doubt arising, the original Standard in Japanese is to be final authority. . . . . _ . . . 2 -: . . . . . . . - . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 06:32:0
4、4 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Z*8762 88 i 4933608 0079824 3 0 C O N T E N T S Pages 1 . Scope 1 2 . Symbols and Definitions . 1 2.1 Symbols . 1 2.2 Definitions 3 3 . Principle of the Method of Measurement and Computation . 5 3.1 Principle of the Meth
5、od of Measurement 5 3.2 Operation of Measurement 5 3.2.1 Introduction 5 3.2.2 Measurement of Differential Pressure 5 3.2.3 Determination of Density 5 3.2.4 Measurement of the Bore of the Contraction Device 6 3.3 Computation of Rate of Flow . 6 3.3.1 Computation of Rate of Flow 6 3.3.2 The Case Where
6、 theChange of the Coefficient of Discharge c or the Flow Coefficient a Dependent on the Reynolds Number Cannot Be Ignored 7 3.4 Uncertainty in Measurement of Rate of Flow 7 3.4.1 Definition of Uncertainty 7 3.4.2 Indication of Uncertainty . 7 3.4.3 Computation of Uncertainty 7 4 . General Requiremen
7、ts for the Measurements 8 4.1 Fluid Contraction Device . 8 4.2 Fluid 8 4.3 Flow Conditions 9 5 . Installation Requirements . 9 5.1 General . 9 5.2 Straight Lengths Required . 9 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing
8、, Bernie Not for Resale, 03/11/2007 06:32:04 MDTNo reproduction or networking permitted without license from IHS -,-,- Pages 5.3 Straightening Devices 13 5.4 Additional Specific Installation Requirements for Orifice Plates . Nozzles and Venturi Nozzles 13 5.4.1 Circularity of the Pipe 13 5.4.2 Drain
9、 Holes and Vent Holes . 14 5.4.3 Location of Contraction Device and Rings . 14 5.4.4 Fixing and Gaskets . 15 5.5 Additional Specific Installation Requirements for Classical Venturi Tubes 15 5.5.1 Circularity of the -Pipe 15 5.5.2 Alignment of the Classical Venturi Tube 16 5.5.3 Drain Holes and Vent
10、Holes . 16 6 . Orifice Plates 16 6.1 General 16 6.2 Structure of Orifice Plate . 16 6.3 Methods of Taking Out Pressure 18 6.3.1 Installation of Pressure Tapping . 18 6.3.2 Construction of Pressure Tapping . 18 6.3.3 Spacing of Pressure Tappings . 21 6.4 Coefficients and Corresponding Uncertainties o
11、f Orifice Plates . 22 6.4.1 Limits of Use 22 6.4.2 Coefficients . 23 6.4.3 Uncertainty . 25 6.5 Pressure Loss 25 7 . Nozzle ; . 25 7.1 General . 25 7.2 ISA 1932 Nozzles 25 7.2.1 Profile of ISA 1932 Nozzles . 25 . f 7.22 Pressure Tapping . 28 (ii) Copyright Japanese Standards Association Provided by
12、IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 06:32:04 MDTNo reproduction or networking permitted without license from IHS -,-,- 11 -. c Pages 7.2.3 Coefficients of ISA 1932 Nozzles and Their Uncertainties 28 7.2.4 Pressure Loss 29 7.3 Long
13、 Radius Nozzles 29 7.3.1 General . 29 7.3.2 Profile of High-Ratio Nozzle 30 7.3.3 Profile of Low-Ratio Nozzle 31 7.3.4 Pressure Tappings 31 7.3.5 Coefficients of Long-Radius nozzles and Their Uncertainties 31 7.3.6 Pressure Loss . 32 8. Venturi Tubes . 32 8.1 32 8.2 Classical Venturi Tubes 32 8.2.1
14、Profile of Classical Venturi Tubes 32 8.2.2 Pressure Tappings . , 36 8.2.3 Coefficients of Classical Venturi Tubes and Their Uncertainty. 37 8.2.4 Pressure Loss . 38 8.3 Venturi Nozzles . 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . , . . i., . . . . . . . . . . . 8.3.1 S
15、tructure of Venturi Nozzles 38 8.3.2 Pressure Tappings 40 8.3.3 Coefficients of Venturi Nozzles and Their uncertainty . 41 8.3.4 Pressure Loss .,e 41 Annex 1. Flow Coefficient (a) of Orifice Plate, Nozzle and Venturi Tube 58 Annex 2. Method for Taking Out the Pressure of Orifice Plate by Means of Fl
16、ow Contraction Tappings . 72 Annex 3. Discharge Coefficient and Its uncertainty of Classical Venturi Tubes Used Outside the Scope Covered by 8.2.3 (1) of the Body of This Standard 86 (iii) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/111111100
17、1, User=Wing, Bernie Not for Resale, 03/11/2007 06:32:04 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z8K8762 88 9 4733608 0079827 7 = U DC 532.57 5.52: 532.57 5.53 JAPANESE INDUSTRIAL STANDARD J I S Measurement of Fluid Flow by Means of Orifice Plates, Nozzles and
18、 Venturi Tubes Z 8762-1988 1. Scope the rate of the fluid flow running full in a circular conduit whose. cross section diameter is 50 to 1200 mm by means of the fluid contraction devices. This Japanese Industrial Standard specifies the method of measurement of Contraction devices dealt with in this
19、standard are as follows: (1) Orifice plates; (a) Corner tapping orif ice, (b) (c) Flange tapping orifice, D and D/2 tapping orifice, (2) Nozzles; (a) ISA() 1932 nozzle, Note ( l ) ISA is the abbreviation for “International Federation of the Natio- nal Standardizing Associations“, the body which was
20、successed by ISO. (b) Long radius nozzle, (3) Venturi tubes; (a) Classical venturi tube, (b) Venturi nozzle. 2. Symbols and Definitions 2.1 Symbols The symbols used in this standard are given in Table 1 below. Corresponding International Standard: IS0 5167-Measurement of fluid flow by means of orifi
21、ce plates, nozzles and Venturi tubes inserted in circular cross-section conduits running f u11 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 06:32:04 MDTNo reproduction or networking perm
22、itted without license from IHS -,-,- J I S 2*8762 88 m 4733b08 0077828 O m I i 2 Z 8762-1988 Table 1. Symbols C d D e E k 1 L m U X Name of symbols Symbols Xmensions M : mass 2 : length r : time i : temper- ature Coefficient of discharge, C = E Diameter of orifice or throat of primary device at oper
23、ating conditions . Upstream internal pipediameter (or upstream diameter of a classical venturi tube) at operating conditions Relative uncertainty (relative value) Velocity of approach factor, E= (i-p4)+ Uniform equivalent roughness Pressure tapping spacing Relative pressure tapping spacing, L = Area
24、 ratio m=p2 Static pressure of the fluid (absolute pres- sure) Mass rate of flow Volume rate of flow Radius Arithmetical mean deviation from the mean line of the profile Reynolds number Reynolds number referred to D Reynolds number referred to d Temperature of the fluid Mean axial velocity of the fl
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