CEN TR 13932-2009 Rotodynamic pumps - Recommendations for fitting of inlet and outlet on piping《旋转动力泵 管道系统的进口和出口管件建议书》.pdf

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1、PD CEN/TR13932:2009ICS 23.080NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWPUBLISHED DOCUMENTRotodynamic pumps Recommendationsfor fitting of inlet andoutlet on pipingThis Published Documentwas published under theauthority of the StandardsPolicy and StrategyCommittee on 28 Feb

2、ruary2009 BSI 2009ISBN 978 0 580 62249 6Amendments/corrigenda issued since publicationDate CommentsPD CEN/TR 13932:2009National forewordThis Published Document is the UK implementation of CEN/TR13932:2009.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/6, Pumps and pu

3、mp testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immun

4、ityfrom legal obligations.PD CEN/TR 13932:2009TECHNICAL REPORTRAPPORT TECHNIQUETECHNISCHER BERICHTCEN/TR 13932January 2009ICS 23.080 Supersedes CR 13932:2000 English VersionRotodynamic pumps - Recommendations for fitting of inlet andoutlet on pipingPompes rotodynamiques - Recommandations pour lesrac

5、cordements des tuyauteries daspiration et derefoulementKreiselpumpen - Empfehlungen fr Rohrleitungsanschlssean Ein-und AutrittstutzenThis Technical Report was approved by CEN on 13 October 2008. It has been drawn up by the Technical Committee CEN/TC 197.CEN members are the national standards bodies

6、of Austria, Belgium, Bulgaria, 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 United Kingdom.EUROPEAN

7、COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. CEN/TR 13932:2009: EPD CEN/TR 13932:2009C

8、EN/TR 13932:2009 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 52 Normative references 63 Definitions 64 Minimum installation precautions 74.1 Pipework components 74.1.1 Convergent - divergent pipes . 74.1.2 Elbows 104.1.3 Tees . 184.1.4 Junctions 204.1.5 Devices to improve flow 234.2 Valves

9、 and fittings . 234.2.1 Stop valves . 234.2.2 Regulating valves 244.2.3 Check valves (according to EN 12334 and EN 14341) . 244.2.4 Valve accessories 24Bibliography 25PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 3 Foreword This document (CEN/TR 13932:2009) has been prepared by Technical Committee CEN/T

10、C 197 “Pumps”, the secretariat of which is held by AFNOR. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes CR

11、13932:2000. PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 4 Introduction The inlet and outlet piping of a pump almost always includes peculiarities or accessories (changes of cross-sectional area, elbows, connections, valves, filters, check valves, etc.). Particularly in the case of inlet piping, flow d

12、isturbances such as swirl, unbalance in the distribution of velocities and pressures and sudden variations in velocity are harmful to the hydraulic performance of the pump, its mechanical behaviour and its reliability. This document cannot attempt to cover the almost infinite range of disturbances t

13、hat may be encountered as well as all their types, geometries and possible combinations. In cases that are not dealt with below, the layout of the piping should be determined by mutual agreement between the parties in keeping with the spirit or a certain number of principles: straight lengths indica

14、ted in this document are adequate values in most cases but it is always beneficial, from a purely hydraulic point of view, to increase them. The optimum length is usually the result of a cost-benefit trade-off. the most hazardous disturbances are those which create a swirling flow as a result of sev

15、eral changes of direction in various planes, this swirl always takes a very long time to settle down, or disturbances which create a very marked unbalanced flow due to a sudden change in cross-sectional area. generally speaking, the higher the specific speed of a pump, the more sensitive it is to fe

16、ed conditions. For this reason, especially strict requirements should be imposed in the case of an axial-flow pump. In fact, the correct operation of a rotodynamic pump is closely linked to the features of the piping system in which it is fitted. The noise level of this system as well as any vibrati

17、ons originating from turbulence or hydraulic shocks also depend on its layout as well as the choice and arrangement of components such as valves, filters, convergent pipes, divergent pipes, etc. The following recommendations are intended to reduce the risk of incorrect operation of the pump and the

18、system as far as possible. Under no circumstances can they guarantee perfect operation for several reasons: the need to make allowance for economic considerations which very often imposes deviation from the ideal arrangement and the risk of incorrect operation which this involves increases the great

19、er such deviation becomes. the extremely complex influence on the recommended values of several factors which cannot be described in detail without complicating the implementation of these recommendations excessively. This is the reason why somewhat wide “average“ values have been adopted even thoug

20、h they may sometimes lead to excessive precautions which may still sometimes nevertheless be inadequate. The main factors in question are as follows: the type of pump (centrifugal, mixed flow, axial flow); the size and speed of the pump; the margin between the available “NPSHA“ and the “NPSHR“ requi

21、red by the pump; the characteristics of the liquid (nature, viscosity, presence of dissolved gas or solids in suspension, etc.); the flow rate of the liquid. The last two factors have a very marked effect on the behaviour of the system and on the measures to be taken in order to limit unwanted condi

22、tions. PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 5 1 Scope This CEN Technical Report lays down stipulations relating to installation conditions for sudden change in section or direction (elbows, tee fittings, junctions) and the most widely used accessories at the inlet and outlet of pumps (valves an

23、d fittings) in order to minimise the effect of disturbances in the flow of liquid thereby created upstream and downstream from the pump and on the operation of the pump. NOTE 1 The recommendations given in this document permit to solve a majority of the most current cases. These recommendations rela

24、te to three aspects of installation: the fitting of the pump to pipework by convergent and divergent pipes; in the case of elbows, tees and branching, their direction with respect to the axis of the pump; the minimum clearances to be adhered to between a disturbing (elbow, valve, etc.) and the mount

25、ing flange of the pump. This document applies to the installation of rot dynamic pumps (centrifugal, mixed flow and axial flow) fitted in piping. It applies to pumps having intake diameters equal to or less than 500 mm. The recommendations may be adapted in agreement with the pump manufacturer for i

26、ntakes having dimensions exceeding 500 mm or for special applications. This document is not applicable to pumps of which the inlet is located in reservoirs, sumps or tanks and which will be dealt with in a subsequent standard. The recommendations in this document are only valid under the following c

27、onditions: Newtonian fluids having a maximum viscosity of 2.10-4m2/s; occluded gas content at pumping temperature and inlet pressure not exceeding 2 % by volume for water and 4 % for other fluids; solids content (small particle size, such as sand) not exceeding 1 % by volume, nor 1 % by weight; in p

28、iping with diameters D1and D2(see Figure 11), flow rate velocity, should be in the following ranges: 3 m/s to 5 m/s at inlet; 4 m/s to 10 m/s at outlet. NOTE 2 These flow rate velocity values are not optimal; they are limits which are not to be exceeded unless special precautions are taken. NOTE 3 I

29、n all cases where these limits are exceeded, it is essential that the pipework design engineer consults the pump manufacturer before finalizing the installation drawings. Even if conditions are well within the stated limits, it is highly advisable to adopt this approach sufficiently early to allow a

30、ny modifications requested by the manufacturer to be made. Many difficulties experienced in a pumping system actually originate from errors in the design and/or production of piping. PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 6 2 Normative references The following referenced documents are indispensab

31、le for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 593, Industrial valves Metallic butterfly valves EN 736-1:1995, Valves Terminology Part 1: Defin

32、itions of types of valves EN 736-3:2008, Valves Terminology Part 3: Definition of terms EN 1171, Industrial valves Cast iron gate valves EN 1983, Industrial valves Steel ball valves EN 1984, Industrial valves Steel gate valves EN 12334, Industrial valves Cast iron check valves EN 13397, Industrial v

33、alves Diaphragm valves made of metallic materials EN 13709, Industrial valves Steel globe and globe stop and check valves EN 13789, Industrial valves Cast iron globe valves EN 14341, Industrial valves Steel check valves EN ISO 9906, Rotodynamic pumps Hydraulic performance acceptance tests Grades 1 a

34、nd 2 (ISO 9906:1999) ISO 7194, Measurement of fluid flow in closed conduits Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes 3 Definitions For the purposes of this document, the definitions of EN 73

35、6-1:1995 apply, and also the following which are in accordance with EN 736-3:2008. 3.1 full bore valves valve with a flow section equal to or greater than 80 % of the section corresponding to the nominal inside diameter of the body end port NOTE The nominal inside diameter of the body end for the pa

36、rticular valve type is specified in the corresponding product or fitness for purpose standard. 3.2 clearway valve valve designed to have an unobstructed flow way to pass a theoretical sphere having a diameter not less than the body end port nominal inside diameter NOTE The nominal inside diameter of

37、 the body end for the particular valve type is specified in the corresponding product or fitness for purpose standard. PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 7 3.3 reduced bore valve valve with a flow section equal to or greater than 36 % of the section corresponding to the port nominal inside di

38、ameter of the body end port and which does not correspond to the full bore valve NOTE The nominal inside diameter of the body end for the particular valve type is specified in the corresponding product or fitness for purpose standard. 4 Minimum installation precautions 4.1 Pipework components 4.1.1

39、Convergent - divergent pipes 4.1.1.1 Convergent transition section 4.1.1.1.1 Horizontal installation For a horizontal installation, the configuration of the convergent transition section is usually non-symmetrical. Its top generating line should then be horizontal, so as to avoid the formation of po

40、ckets of air or gas. The angle () should not exceed 20 (see Figure 1). When the angle exceeds 20, the fitting of the convergent to the pump intake should be made by means of a transition zone with a radius of at least of the pump inlet diameter. However, when the degassing is carried out on the upst

41、ream side of the convergent transition section continuously: either naturally; or by means of a suitable device. It will be possible to use a symmetrical convergent transition section as described in Clause 4.1.1.1.2. Key 1 Direction of fluid flow 2 Diameter of the pipework inlet 3 Diameter of the p

42、ump inlet Figure 1 Non-symmetrical convergent transition section NOTE In some cases, particularly when the pump incorporates an inducer, it is not recommended fitting a convergent transition section to the pump inlet. In this case, the inlet pipeline near the pump should be studied jointly between t

43、he pump manufacturer and those responsible for the installation. PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 8 4.1.1.1.2 Vertical installation The configuration of the convergent transition section is symmetrical for a vertical installation (see Figure 2). The included angle () should not exceed 25. K

44、ey 1 Direction of fluid flow 2 Diameter of the pipework inlet 3 Diameter of the pump inlet Figure 2 Symmetrical convergent transition section PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 9 4.1.1.2 Divergent transition section The configuration of the divergent transition section is usually symmetrical,

45、 irrespective of the installation (see Figure 3). Key 1 Direction of fluid flow 2 Diameter of the pump outlet 3 Diameter of the pipework outlet Figure 3 Symmetrical divergent transition section The include angle () for a divergent transition sections is recommended to be between 7 and 12 to avoid ex

46、cessive energy losses. In some special cases, “on-line“ pumps for example, the non-symmetrical configuration of the divergent may be permitted with a maximum angle of 8 (see Figure 4). Key 1 Direction of fluid flow 2 Diameter of pump 3 Diameter of pipework Figure 4 Non-symetrical divergent transitio

47、n section PD CEN/TR 13932:2009CEN/TR 13932:2009 (E) 10 4.1.2 Elbows 4.1.2.1 Shapes of elbows 4.1.2.1.1 Standardised elbows This document only applies to standardised elbows of which there are two types: small-radius elbows referred to as 2 D: R D; and preferably, large-radius elbows referred to as 3

48、 D: R 1,5 D. R is the bending radius; and D is the diameter of the piping (inside or outside diameter as appropriate). Figure 5 Dimensions of standardised elbows The use of large-radius elbows is strongly recommended, particularly in inlet piping, or for D 100 mm. 4.1.2.1.2 Angle of elbows The follo

49、wing sub-clauses make provision for 90 elbows that are the most commonly encountered. If an elbow having an angle 90 is used, such elbows are comparable to 90 elbows. 4.1.2.1.3 Other shapes of elbows Sharp elbows without a bend radius are to be prohibited (except those with fins that are mentioned below). Segmented elbows, if they have at least five segments, may be likened to standardised elbows. Other sha