BS 1042-1.1-1981 Measurement of fluid flow in closed conduits Part1.Pressure differential devices Section 1.1 Specification
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560C2AF5426F44FB8B394701BD22F27D |
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3.19 |
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69 |
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日期： |
2024-6-23 |
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BSI BS*1042 PT1 sec*i.i ai ■ ibSHttn oi3aab? t ■,BS 1042: Section 1.1 :1981,UDC 532.542: 532.575.52,(Reprinted, incorporating Amendments No. 1 and No. 2),Measurement of fluid flow in closed conduits,Part 1. Pressure differential devices,Section 1.1 Specification for square-edged orifice plates,nozzles and venturi tubes inserted in circular cross-section,conduits running full,Mesure de debit des fluides dans les conduites fermees,Partie 1. Appareils deprimogenes,Section 1.1 Diaphragmes a aretes vives, tuyeres et tubes de venturi inseres,dans des conduites en charge de section circulaire — Specifications,DurchflufSmessung von Fliissigkeiten in geschlossenen Leitungen,Teil 1, Differenzdruckmefigerate,Abschnitt 1.1 Anforderungen an scharfkantige Blenden, Dusen und Venturi-Rdhren,bei voller Stromung in Leitungen mit rundem Querschnitt,Confirmed,JUL 1987,British Standards Institution,BSI BS*10M2 PT1 SEC*1.1 fll ■ IbSMbbT D13afibfl 1 ■,BS 1042 : Section 1.1 : 1981,Contents,Foreword Inside front cover,Cooperating organizations Back cover,Methods,1. Scope and field of application 1,2. Symbols and definitions 1,3. Principle of the method of measurement and,computation 4,4, Selection of the primary device 6,5. General requirements for the measurements 6,6. Installation requirements 7,7. Orifice plates 14,8, Nozzles 20,9. Venturi tubes 26,10. Uncertainties on the measurement of flow-rate 34,Annexes,A Tables of discharge and flow coefficients 36,B Classical venturi tubes used outside the scope,covered by this British Standard 62,C Pressure loss in a classical venturi tube 64,Tables,1. Symbols 2,2. Selection criteria of the type of primary,device 6,3. Required straight lengths for orifice plates,nozzles and venturi nozzles 8,4. Required upstream straight lengths for classical,venturi tubes 9,5. Upper limits of relative roughness of the,upstream pipe-line for orifice plates 18,6. Examples of values of the pipe wall roughness k 19,7. Total length of the nozzle (ISA 1932) related,to 0 22,8. Upper limits of relative roughness for ISA 1932,nozzles 23,9. Upper limits of relative roughness for venturi,nozzles 33,10 to 35. Tables of discharge and flow coefficients,(Annex A) 36,Figures,1. Straighteners 10,2. Standard orifice plate 14,3. Spacing of pressure tappings for orifice plates,with D and D/2 or flange tappings 17,4. Corner tappings 17,5. ISA 1932 nozzle 21,6. Long-radius nozzles 24,7. Geometric profile of the classical venturi tube 27,8. Pressure loss across classical venturi tube 31,9. Venturi nozzle 33,10. Carrier ring 33,11. Value of the pressure loss across a classical,venturi tube 65,Foreword,This British Standard has been prepared under the,direction of the Industrial-process Measurement and,Control Standards Committee. It is technically equivalent,to ISO 5167 — 1980 'Measurement of fluid flow by,means of orifice plates, nozzles and venturi tubes inserted,in circular cross-section conduits running full', published,by the International Organization for Standardization,(ISO).,For ease of reproduction the text of ISO 5167 has been,used with certain editorial changes made in order to clarify,the text. Some terminology and certain conventions are,not identical with those used in British Standards;,attention is especially drawn to the following.,The comma has been used throughout as a decimal,marker. In British Standards it is current practice to,use a full stop on the baseline as the decimal marker.,BS 1042 : Part 1 : 1964 is being revised in four Sections of,which this is Section 1.1. Section 1.2 provides supplementary,information to Section 1.1, consisting of the specification,of the geometry and method of use (installation and,operating conditions) of pressure difference devices not,dealt with in Section 1.1. Those devices are:,(a) conical orifice plates;,(b) quarter circle orifice plates;,(c) eccentric orifice plates;,(d) Borda inlets for air measurements.,Information is also given on using square-edged orifice plate,installations under conditions not covered in Section 1.1.,Those conditions include the following:,(a) drain holes through the orifice plate or nozzle;,(b) orifice plates installed in pipes with diameters in the,range 25 mm < D < 50 mm;,(c) orifice plates, nozzles or venturi nozzles installed,where there is no upstream or downstream pipeline.,Section 1.3 (under consideration) will deal with critical,flow measurement and the requirements for and the,method of use of critical flow venturi nozzles inserted,in a closed conduit to determine the rate of flow of the,fluid flowing in the conduit. Section 1.3 will also cover,the calculation of critical flowrates and their associat……
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