1、BRITISH STANDARD BS EN ISO 5198:1999 Incorporating Corrigendum No. 1 Centrifugal, mixed flow and axial pumps Code for hydraulic performance tests Precision class The European Standard EN ISO 5198:1998has the status of a British Standard ICS 23.080BSENISO5198:1999 This British Standard, having been p
2、repared under the directionof the Engineering SectorCommittee, was published under the authority of the Standards Committee and comesinto effect on 15April1999 BSI 04-2000 ISBN 0 580 32364 1 National foreword This British Standard is the English language version of EN ISO5198:1998. It is identical w
3、ith ISO5198:1987. It supersedes BS5316-3:1988, which although identical to ISO5198:1987, will be withdrawn on15April1999. The UK participation in its preparation was entrusted by Technical Committee MCE/6, Pumps and pump testing, to Subcommittee MCE/6/3, Testing of pumps, which has the responsibilit
4、y to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of o
5、rganizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publica
6、tions. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standa
7、rd does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, a
8、n inside front cover, pages i to ii, theEN ISO title page, page 2, the ISO title page, pages ii and vi, pages 1 to 96 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cove
9、r. Amendments issued since publication Amd. No. Date Comments 10668 Corrigendum No. 1 August1999 Indicated by a sideline in the marginBSENISO5198:1999 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Foreword v Text of ISO 5198 1ii blankEUROPEAN STANDARD NORME EUROPENNE EU
10、ROPISCHE NORM EN ISO 5198 November 1998 ICS 23.080 Descriptors: See ISO document English version Centrifugal, mixed flow and axial pumps Code for hydraulic performance tests Precision class (ISO 5198:1987) Pompes centrifuges, hlico-centrifuges et hlices Code dessais de fonctionnement hydraulique Cla
11、sse de precision (ISO5198:1987) Kreiselpumpen (Radial-, Halbaxial- und Axialkreiselpumpen) Regeln fr die Messungder hydraulischen Betriebsverhaltens Przisionsklasse (ISO 5198:1987) This European Standard was approved by CEN on 8 November 1998. CEN members are bound to comply with the CEN/CENELEC Int
12、ernal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN memb
13、er. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members
14、 are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisatio
15、n Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5198:1998EENISO5198:1998 BSI 04-2000 2 Foreword The text of the International Standar
16、d from Technical Committee ISO/TC115“Pumps” of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC197“Pumps” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standa
17、rd, either by publication of an identical text or by endorsement, at the latest by May1999, and conflicting national standards shall be withdrawn at the latest by May1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to
18、implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. Endorsement notice The text of the International Standard ISO5198:1998
19、has been approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in the Annex ZA (normative).ENISO5198:1998 ii BSI 04-2000 Contents Page Foreword v 0 Introduction 1 1 Scope 1 2 Field of application 1 3 References 2 Section 1. Ge
20、neral recommendations 4 Definitions and symbols 3 5 Specified duty 11 6 General requirements for tests 12 Section 2. Measurement methods 7 Measurement of rate of flow 21 8 Measurement of head 26 9 Measurement of speed of rotation 46 10 Measurement of power input 46 11 Measurement of pump efficiency
21、by the thermodynamic method 50 12 Cavitation tests 62 Annex A Estimation and analysis of uncertainties 69 Annex B Comparison of test results with specified duty 73 Annex C Thermodynamic properties of water and assessment of the accuracy of efficiency measurements by the thermodynamic method 79 Annex
22、 D Other cavitation tests 91 Annex E Friction losses 93 Annex ZA (normative) Normative references to international publications with their relevant European publications 96 Figure 1 Graph of the evolution of a phenomenon 4 Figure 2 Envelopes of the ellipses of total uncertainty for each measured poi
23、nt 21 Figure 3 Different types of standardized differential pressure devices 25 Figure 4 Different types of standardized weirs and flumes 27 Figure 5 Determination of available velocity head 29 Figure 6 Determination of pump total head 30 Figure 7 Examples of total head determination by water level
24、measurements 32 Figure 8 Examples of yaw probes 33 Figure 9 Example of installation with pre-swirl 35 Figure 10 Correction of measured inlet total head 35 Figure 11 Examples of pressure tappings in metallic wall 38 Figure 12 Example of pressure tapping in concrete wall 38 Figure 13 Pressure tappings
25、 connected through ring main to pressure gauge 39 Figure 14 Test of a centrifugal pump by means of liquid column gauges 41 Figure 15 Direct measurement of pump total head 42 Figure 16 Dead-weight manometer with stabilization by differential pressure measurement 43 Figure 17 Pressure weighbeam 44 Fig
26、ure 18 Test of a centrifugal pump by means of a Bourdon gauge 45 Figure 19 Measurement of the power at the terminals of a motor: three wattmeter method 47ENISO5198:1998 BSI 04-2000 iii Page Figure 20 Measurement of the power at the terminals of a motor: two wattmeter method 48 Figure 21 General sche
27、matic diagram of measuring vessels 53 Figure 22 Enthalpy (h) entropy (s) thermodynamic diagram for water 54 Figure 23 Example of decomposition of the fluid flow in a pump 55 Figure 24 Example of graphic determination of the correction %E mto allow for heat transfer in a sampling circuit 61 Figure 25
28、 Cavitation tests 66 Figure 26 Cavitation tests Direct measurement method 67 Figure 27 Methods of determining required (NPSH) for %H/H =% 68 Figure 28 Example of a discontinuity 73 Figure 29 Graph of comparison of measured total head with that specified at a given flow rate 74 Figure 30 Graph for co
29、mparison of measured efficiency with that specified at a given flow rate 74 Figure 31 Graph for comparison of measured power input with that specified at a given flow rate 75 Figure 32 Graph for comparison of measured flow rate with that specified at a given total head 75 Figure 33 Graph for compari
30、son of measured efficiency with that specified at a given total head 76 Figure 34 Graph for comparison of measured power input with that specified at a given total head 76 Figure 35 Graph for comparison of flow rate and total head with a specified duty point 77 Figure 36 Graph for comparison of flow
31、 rate and efficiency with a specified duty point 78 Figure 37 Graph for comparison of flow rate and power input with a specified duty point 78 Figure 38 Detected effect at various (NPSH) values according to criterion selected 92 Figure 39 Graph showing velocities above which loss corrections are req
32、uired 94 Figure 40 Values of universal coefficient for head loss 95 Table 1 List of quantities 6 Table 2 Alphabetical list of symbols 10 Table 3 List of letters and figures used as subscripts 11 Table 4 Specification of “clean cold water” 12 Table 5 Maximum permissible amplitude of fluctuations as a
33、 percentage of mean value of quantity to be measured, for direct visual observation 15 Table 6 Limits of variation between repeated mean values of the same quantity 17 Table 7 Maximum permissible limits of uncertainty 19 Table 8 Methods for flow rate measurement 22 Table 9 Terms, definitions, symbol
34、s and units 50 Table 10 Ideal positions of probes 59 2 K 2 - + ENISO5198:1998 iv BSI 04-2000 Page Table 11 Positions of probes 59 Table 12 Values of Students t distribution 70 Table 13 Values of/t 71 Table 14 Maximum permissible value of ratio R 71 Table 15 Isothermal coefficient, a (10 3m 3 /kg) 81
35、 Table 16 Density, (kg/m 3 ) 83 Table 17 Specific heat capacity per unit mass at constant pressure, c pJ/(kgK) 86 Table 20 Typical values of equivalent uniform roughness k for pipes 93 Descriptors: Pumps, centrifugal pumps, tests, performance tests. nENISO5198:1998 BSI 04-2000 v Foreword ISO (the In
36、ternational Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee h
37、as been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval b
38、efore their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least75% approval by the member bodies voting. International Standard ISO5198was prepared by Technical Committee ISO/TC115, Pumps. Users should note that all Interna
39、tional Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.vi blankENISO5198:1998 BSI 04-2000 1 0 Introduction This International Standard is the first of a set of International Standa
40、rds dealing with performance tests of centrifugal, mixed flow and axial pumps (in the rest of the text referred to as “pumps”). It specifies precision class tests (former class A). Engineering class I and class II tests (former classes B and C) will be the subject of a further International Standard
41、. 1) The aims of these classes are quite different. The precision class is mainly used for research, development and scientific purposes in laboratories, where an extremely high accuracy of measurement is important. The engineering classes are generally applied for acceptance tests. In most cases, e
42、ngineering class II is adequate for acceptance tests. The use of engineering class I is restricted to special cases when there is a need to have the pump performance more precisely defined. However, there may be cases of high importance, in which even an engineering class I acceptance test will be j
43、udged inadequate for the precision required for defining pump performance. In these cases the use of the precision class may exceptionally be necessary for an acceptance test. Attention must be paid to the fact that the accuracy required for a precision class test significantly increases the test co
44、sts by comparison with the costs for an engineering class test. Precision class tests may not always be practicable, even when great effort and expense are devoted to measurements. Performance tests to precision class specifications will be required, and are possible, only in suitable circumstances.
45、 Therefore both the purchaser and the manufacturer shall carefully examine whether the accuracy required for a precision class test might be achieved either on site, on the manufacturers test bed or in a mutually agreed laboratory. It should be noted that it may not be possible to guarantee precisio
46、n class accuracy in advance of the tests. The purpose of this International Standard is to specify how to carry out a test with extremely high precision. This International Standard does not recommend any constructional tolerance nor any global tolerance for acceptance purposes; it is devoted to spe
47、cifying and describing procedure and methods for accurately ascertaining the performance of a pump under the conditions in which it is tested. Contractual interpretation of the test results must be the subject of a special agreement between the parties concerned (see Annex B). Pump performance may b
48、e greatly affected by the installation conditions, and this must be especially considered when drawing up the contract if a precision class test is to be carried out. 1 Scope This International Standard specifies precision class performance tests for centrifugal, mixed flow and axial pumps. It defin
49、es the terms and quantities that are used and specifies general requirements for tests. It specifies ways of measuring the characteristic quantities of the precision class so as to ascertain the performance of the pump and thus provide a basis for comparison with the performance specified in the contract. The structural details of pumps and the mechanical properties of their components lie outside the scope
