1、BRITISH STANDARD BS EN ISO 9908:1998 Technical specifications for centrifugal pumps Class III ICS 23.080 +A1:2011National foreword This British Standard is the UK implementation of EN ISO 9908:1993+A1:2011. It supersedes BS EN ISO 9908:1998, which is withdrawn. The start and finish of text introduce
2、d or amendment is indicated in the text by tags. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendment 1 is indicated by !“. The UK participation in its preparation was entrusted to Technical Committee MCE/6, Pumps and pump testing. A l
3、ist of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from l
4、egal obligations. BS EN ISO 9908:1998+A1:2011 This British Standard, having been prepared under the direction of the Machinery and Components Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 March 1994 BSI 2011 The following BSI referen
5、ces relate to the work on this standard: Committee reference MCE/6 Draft for comment 91/76636 DC Amendments/corrigenda issued since publication Amd. No. Date Comments 9865 February 1998 Renumbers BS 7736:1994 as BS EN ISO 9908:1998 31 July 2011 Implementation of ISO amendment 1:2011 with CEN endorse
6、ment A1:2011 ISBN 978 0 580 72931 7i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Definitions 4 4 Design 4 5 Materials 8 6 Shop inspection and tests 8 7 Preparation for dispatch 8 Annex A (normative) Centr
7、ifugal pump Data sheet 9 Annex B (normative) Enquiry, proposal, purchase order 14 Annex C (normative) Documentation 14 Annex D (informative) Examples of seal arrangements 14 Annex E (informative) Piping arrangements for seals 16 Annex F (informative) Check list 18 Annex G (informative) Bibliography
8、18 Figure 1 Relationship between temperature and pressure 5 Figure 2 Driver output percentage of rated pump power requiredintherange1kW to100kW 5 Table 1 Limits of vibration severity for horizontal pumpswithmultivaneimpellers 5 List of references Inside back cover BSI 2011 BS EN ISO 9908:1998+A1:201
9、1 EN ISO 9908:1998+A1:2011 (E)This page deliberately set blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9908:1998+A1:2011 ICS 23.080 Descriptors: See ISO document English version Technical specifications for centrifugal pumps Class III (ISO 9908:1993) Spcifications techniques pour pom
10、pes centrifuges Classe III (ISO 9908:1993) Technische Anforderungen fr Kreiselpumpen Klasse III (ISO 9908-1:1993) This European Standard was approved by CEN on 18 October 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eu
11、ropean 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 member. This European Standard exists in three official versions (Engli
12、sh, 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 are the national standards bodies of Austria, Belgium, CzechRepubl
13、ic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stass
14、art 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9908:1997 E April 20112 Foreword The text of the International Standard from Technical Committee ISO/TC115, Pumps, of the International Organization f
15、or Standardization (ISO) has been taken over as a 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 standard, either by publicatoin of an identical text or by endorsement, at the latest
16、 by May1998, and conflicting national standards shall be withdrawn at the latest by May1998. According to the CEN/CENELEC Internal Regulations, the national standards orgainzations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Fin
17、land, 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 ISO9908:1993 has been approved by CEN as a European Standard without any modification. Forew
18、ord to amendment A1 This document (EN ISO 9908:1997/A1:2011) has been prepared by Technical Committee ISO/TC 115 “Pumps” in collaboration with Technical Committee CEN/TC 197 “Pumps” the secretariat of which is held by AFNOR. This Amendment to the European Standard EN ISO 9908:1997 shall be given the
19、 status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. Attention is drawn to the possibility that some of the elements of this document may be th
20、e subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgi
21、um, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsemen
22、t notice The text of ISO 9908:1993/AMD 1:2011 has been approved by CEN as a EN ISO 990 :1997/A1:2011 without any modification. 8 BSI 2011 BS EN ISO 9908:1998+A1:2011 EN ISO 9908:1998+A1:2011 (E)3 Introduction This International Standard is the third of a set dealing with technical specifications of
23、centrifugal pumps; they are designated as Classes I, II and III. Class I (see ISO9905) comprises the most severe and Class III (this International Standard) the least severe requirements. For requirements for Class II centrifugal pumps, see ISO5199. The selection of the class to be used is made in a
24、ccordance with the technical requirements for the application for which the pump is intended. The class chosen is to be agreed between purchaser and manufacturer/supplier. The safety requirements of the field of application are furthermore to be taken into account. However, it is not possible to sta
25、ndardize the class of technical requirements for centrifugal pumps for a certain field of application, because each field of application comprises different requirements. All classes (I, II and III) can be used in accordance with the different requirements of the pump application. It may happen that
26、 pumps built in accordance with Classes I, II and III may work beside each other in one plant. Further text covering specific applications or industry requirements are dealt with later in separate standards. Criteria for the selection of a pump of the required class for a certain application may be
27、based on: reliability, operating conditions, environmental conditions. Throughout this International Standard, text written in bold letters indicates where a decision may be required by the purchaser, or where agreement is required between the purchaser and manufacturer/supplier. 1 Scope 1.1 This In
28、ternational Standard covers Class III requirements for centrifugal pumps of single stage, multistage, horizontal or vertical construction (coupled or close-coupled) with any drive and any installation for general application. 1.2 This International Standard includes design features concerned with in
29、stallation, maintenance and safety of such pumps including baseplate, coupling and auxiliary piping but excluding the driver, if it is not an integral part of the pump. 1.3 Where the application of this International Standard has been called for: a) and requires a specific design feature, alternativ
30、e designs may be offered which meet the intent of this International Standard provided that the alternative is described in detail. b) pumps not complying with all requirements of this International Standard may be offered for consideration, provided that all deviations are stated. 2 Normative refer
31、ences The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International St
32、andard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 76:1987, Rolling bearings Static load ratings. ISO 281:1990, Roiling bearings Dynamic
33、load ratings and rating life. ISO 3069:1974, End suction centrifugal pumps Dimensions of cavities for mechanical seals and for soft packing. ISO 7005-1:1992, Metallic flanges Part 1: Steel flanges. ISO 7005-2:1988, Metallic flanges Part 2: Cast iron flanges. ISO 7005-3:1988, Metallic flanges Part 3:
34、 Copper alloy and composite flanges. ISO 9905:, Technical specifications for centrifugal pumps Class I 1) . 1) To be published. !Text deleted“ ISO 9906: , Rotodynamic pumps Hydraulic p e r f o r m a n c e a c c e p t a n c e t e s t s G r a d e s 1 , 2 a n d 3 ! “ )To be published. (Revision of ISO
35、9906:1999) ! “ 2) 2 BSI 2011 BS EN ISO 9908:1998+A1:2011 EN ISO 9908:1998+A1:2011 (E)4 3 Definitions For the purposes of this International Standard, the definitions given in ISO9905 and the following definitions apply. 3.1 rated conditions conditions (driver excluded) that define the (guarantee) po
36、int necessary to meet all defined operating conditions, taking into account any necessary margins NOTE 1This definition differs slightly from that given in ISO9905. 3.2 rated driver output the maximum permissible driver power output under site operating conditions 3.3 pressure-temperature rating rel
37、ationship between pressure and temperature given in the form of a graph (seeFigure 1) 4 Design 4.1 General Whenever the documents include contradicting technical requirements, they apply in the following sequence: a) purchase order (or enquiry if no order is placed) (seeAnnex B); b) data sheet (see
38、Annex A); c) this International Standard; d) other standards to which reference is made in the order (or enquiry if no order is placed). 4.1.1 Characteristic curve The characteristic curve shall indicate the allowable operating range of the pump. 4.1.2 Net positive suction head (NPSH) The NPSHR shal
39、l be based on cold water as specified in ISO . The NPSHA must exceed NPSHR by a margin of at least0,5m. The basis for use in performance curves is that NPSH corresponding to a drop of3% of the total head of the first stage of the pump (NPSH3). 4.1.3 Installation The pumps should preferably be suitab
40、le for outdoor installation under normal environmental conditions. If they are suitable only for indoor installation this information shall be clearly stated in the manufacturer/suppliers documentation. For outdoor installation, the range of environmental conditions shall be specified by the purchas
41、er. 4.2 Prime movers 4.2.1 Defined operating conditions Prime movers required as driver for coupled pumps shall have power output ratings at least equal to the percentage of rated pump power input given in Figure 2 for the range of1kW to100kW. For pump power input outside this range, the percentage
42、is to be agreed upon between manufacturer/supplier and purchaser. Where the prime mover has an output rating covering the power requirements at any operating conditions of the impeller diameter installed, no extra margins are required. 4.2.2 Undefined operating conditions Prime movers as drivers for
43、 close-coupled pumps shall have power output ratings covering the power requirements at any operating conditions of the impeller diameter installed. These conditions eliminate the need for extra margins. 4.3 Critical speed, balance and vibration 4.3.1 Critical speed Under operating conditions, the a
44、ctual first lateral critical speed of the rotor when coupled to the drive agreed upon shall be at least10% above the maximum allowable continuous speed including the trip speed of a turbine-driven pump. For vertical lineshaft pumps, a flexible shaft is permitted. 4.3.2 Balance and vibration 4.3.2.1
45、Horizontal pumps Unfiltered vibration shall not exceed the vibration severity limits given in Table 1 when measured on the manufacturer/suppliers test facilities. These values are measured radially at the bearing housing at a single operating point at rated speed ( 5%) and rated flow (5%) when opera
46、ting without cavitation. Pumps with a special impeller, for example a single channel impeller, may exceed the limits given in Table 1. In such case the pump manufacturer/supplier should indicate this in his offer. 4.3.2.2 Vertical lineshaft pumps a) Vibration readings shall be taken on the top flang
47、e of the driver mount on vertical lineshaft pumps with rigid couplings and near to the top pump bearing on vertical pumps with flexible couplings. b) Vibration limits for both rolling and sleeve bearing pumps shall not exceed a velocity of7,1mm/s rms during shop test at rated speed( 5%), and rated f
48、low ( 5%) operating without cavitation. 9906 ! “ BSI 2011 BS EN ISO 9908:1998+A1:2011 EN ISO 9908:1998+A1:2011 (E)5 Table 1 Limits of vibration severity for horizontal pumps with multivane impellers Figure 1 Relationship between temperature and pressure Figure 2 Driver output percentage of rated pum
49、p power required in the range 1 kW to 100 kW Speed of rotation n Maximum rms values of the vibration velocity for the shaft centreline height h 1 a mm/s min 1 h 1225 mm n 1 800 2,8 4,5 1 800 n 4 500 4,5 7,1 For horizontal foot-mounted pumps, h 1is the distance between baseplate area in contact with pump feet and pump shaft centreline. a ! “ BSI 2011 BS EN ISO 9908:1998+A1:2011 EN ISO 9908:1998+A1:2011 (E)6 4.4 Pressure-containing parts 4.4.1 Pressure-temperature rating The pressure limit (maximum allowable working p
