EN 60534-2-1:2011

SLOVENSKI STANDARD
01-julij-2011
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SIST EN 60534-2-1:2001
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Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow
under installed conditions (IEC 60534-2-1:2011)
Stellventile für die Prozessregelung - Teil 2-1: Durchflusskapazität -
Bemessungsgleichungen für Fluide unter Betriebsbedingungen (IEC 60534-2-1:2011)
Vannes de régulation des processus industriels - Partie 2-1: Capacité d'écoulement -
Equations de dimensionnement pour l'écoulement des fluides dans les conditions
d'installation (CEI 60534-2-1:2011)
Ta slovenski standard je istoveten z: EN 60534-2-1:2011
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60534-2-1
NORME EUROPÉENNE
May 2011
EUROPÄISCHE NORM
ICS 23.060.40; 25.040.40 Supersedes EN 60534-2-1:1998

English version
Industrial-process control valves -
Part 2-1: Flow capacity -
Sizing equations for fluid flow under installed conditions
(IEC 60534-2-1:2011)
Vannes de régulation des processus Stellventile für die Prozessregelung -
industriels - Teil 2-1: Durchflusskapazität -
Partie 2-1: Capacité d'écoulement - Bemessungsgleichungen für Fluide unter
Equations de dimensionnement pour Betriebsbedingungen
l'écoulement des fluides dans les (IEC 60534-2-1:2011)
conditions d'installation
(CEI 60534-2-1:2011)
This European Standard was approved by CENELEC on 2011-05-04. CENELEC members are bound to comply
with the CEN/CENELEC Internal 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 CENELEC member.

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 CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60534-2-1:2011 E
Foreword
The text of document 65B/783/FDIS, future edition 2 of IEC 60534-2-1, prepared by SC 65B, Devices &
process analysis, of IEC TC 65, Industrial-process measurement, control and automation, was submitted
to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60534-2-1 on 2011-05-04.
This European Standard supersedes EN 60534-2-1:1998.
EN 60534-2-1:1998:
— the same fundamental flow model, but changes the equation framework to simplify the use of the
standard by introducing the notion of ∆p ;
sizing
— changes to the non-turbulent flow corrections and means of computing results;
— multi-stage sizing as an Annex.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-02-04
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-05-04
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60534-2-1:2011 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60534-2-1:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60534-1 2005 Industrial-process control valves - EN 60534-1 2005
Part 1: Control valve terminology and general
considerations
IEC 60534-2-3 1997 Industrial-process control valves - EN 60534-2-3 1998
Part 2-3: Flow capacity - Test procedures

IEC 60534-2-1 ®
Edition 2.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial-process control valves –
Part 2-1: Flow capacity – Sizing equations for fluid flow under installed
conditions
Vannes de régulation des processus industriels –
Partie 2-1: Capacité d'écoulement – Equations de dimensionnement pour
l'écoulement des fluides dans les conditions d'installation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 23.060.40; 25.040.40 ISBN 978-2-88912-399-5

– 2 – 60534-2-1  IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols . 8
5 Installation . 9
6 Sizing equations for incompressible fluids . 10
6.1 Turbulent flow . 10
6.2 Pressure differentials . 11
6.2.1 Sizing pressure differential, ∆p . 11
sizing
6.2.2 Choked pressure differential, ∆p . 11
choked
6.2.3 Liquid critical pressure ratio factor, F . 11
F
6.3 Non-turbulent (laminar and transitional) flow . 11
7 Sizing equations for compressible fluids . 11
7.1 General . 11
7.2 Pressure differentials . 12
7.2.1 Sizing pressure drop ratio, x . 12
sizing
7.2.2 Choked pressure drop ratio, x . 12
choked
7.3 Specific heat ratio factor, F . 12
γ
7.4 Expansion factor, Y . 13
7.5 Compressibility factor, Z . 13
7.6 Non-turbulent (laminar and transitional) flow . 14
8 Correction factors common to both incompressible and compressible flow . 14
8.1 Piping geometry correction factors . 14
8.2 Estimated piping geometry factor, F . 14
P
8.3 Estimated combined liquid pressure recovery factor and piping geometry
factor with attached fittings, F . 15
LP
8.4 Estimated pressure differential ratio factor with attached fittings, x . 16
TP
9 Reynolds Number, Re . 16
V
Annex A (normative) Sizing equations for non-turbulent flow . 18
Annex B (normative) Sizing equations for fluid flow through multistage control valves. 21
Annex C (informative) Piping factor computational considerations . 28
Annex D (informative) Engineering Data . 34
Annex E (informative) Reference calculations . 41
Bibliography . 54

Figure 1 – Reference pipe section for sizing . 10
Figure B.1 – Multistage multipath trim . 23
Figure B.2 – Multistage single path trim . 24
Figure B.3 – Disk from a continuous resistance trim The complete trim consists of a
number of these disks stacked together. . 25
Figure B.4 – Sectional view of continuous resistance trim with multiple flow passages
having vertical undulations . 25
Figure C.1 – Determination of the upper limit of the flow coefficient by the iterative
method . 32

60534-2-1  IEC:2011 – 3 –
Figure C.2 – Determination of the final flow coefficient by the iterative method . 33
Figure D.1 – Piping geometry factors . 37
Figure D.2 – Pressure recovery factors . 39
Figure D.3 – Liquid critical pressure ratio factor F . 40
F
Table 1 – Numerical constants N . 17
Table B.1 – Values of the stage interaction factors, k, and the reheat factors, r for
multistage single and multipath control valve trim . 27
Table B.2 – Values of the stage interaction factors, k, and the reheat factors, r for
continuous resistance control valve trim . 27
Table C.1 – Incompressible flow . 31
Table C.2 – Compressible flow . 31
Table D.1 – Typical values of valve style modifier F , liquid pressure recovery factor F
d L
a)
and pressure differential ratio factor x at full rated travel . 35

T
– 4 – 60534-2-1  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS CONTROL VALVES –

Part 2-1: Flow capacity –
Sizing equations for fluid flow under installed conditions

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardiza
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