oSIST prEN ISO 21049:2010

SLOVENSKI STANDARD
oSIST prEN ISO 21049:2010
01-maj-2010
ýUSDONH6LVWHPLJUHGQLKWHVQLON]DFHQWULIXJDOQHLQURWDFLMVNHþUSDONH,62',6

Pumps - Shaft-sealing systems for centrifugal and rotary pumps (ISO/DIS 21049:2010)
Pumpen - Wellendichtungssysteme für Kreiselpumpen und rotierende
Verdrängerpumpen (ISO/DIS 21049:2010)
Pompes - Dispositifs d'étanchéité de l'arbre pour pompes centrifuges et rotatives
(ISO/DIS 21049:2010)
Ta slovenski standard je istoveten z: prEN ISO 21049
ICS:
21.140 Tesnilke, mašilke Seals, glands
23.080 ýUSDONH Pumps
oSIST prEN ISO 21049:2010 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 21049:2010

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oSIST prEN ISO 21049:2010


EUROPEAN STANDARD
DRAFT
prEN ISO 21049
NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2010
ICS 83.140.50; 23.080; 23.100.60 Will supersede EN ISO 21049:2004
English Version
Pumps - Shaft-sealing systems for centrifugal and rotary pumps
(ISO/DIS 21049:2010)
Pompes - Dispositifs d'étanchéité de l'arbre pour pompes Pumpen - Wellendichtungssysteme für Kreiselpumpen und
centrifuges et rotatives (ISO/DIS 21049:2010) rotierende Verdrängerpumpen (ISO/DIS 21049:2010)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 12.

If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN 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 CEN Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, 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 United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 21049:2010: E
worldwide for CEN national Members.

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oSIST prEN ISO 21049:2010
prEN ISO 21049:2010 (E)
Contents Page
Foreword .3

2

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oSIST prEN ISO 21049:2010
prEN ISO 21049:2010 (E)
Foreword
This document (prEN ISO 21049:2010) has been prepared by Technical Committee ISO/TC 115 "Pumps" in
collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for
petroleum, petrochemical and natural gas industries” the secretariat of which is held by AFNOR.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 21049:2004.
Endorsement notice
The text of ISO/DIS 21049:2010 has been approved by CEN as a prEN ISO 21049:2010 without any
modification.

3

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oSIST prEN ISO 21049:2010

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oSIST prEN ISO 21049:2010
DRAFT INTERNATIONAL STANDARD ISO/DIS 21049
ISO/TC 115/SC 3 Secretariat: ANSI
Voting begins on: Voting terminates on:
2010-03-25 2010-08-25
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Pumps — Shaft-sealing systems for centrifugal and rotary
pumps
Pompes — Dispositifs d'étanchéité de l'arbre pour pompes centrifuges et rotatives
[Revision of first edition (ISO 21049:2004)]
ICS 23.080; 23.100.60; 83.140.50

ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
PDF disclaimer
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Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
©
ii ISO 2010 – All rights reserved

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
Contents Page
Foreword . vi
Introduction . vii
1 Scope . 8
2 Normative References . 8
3 Terms and Definitions . 10
4 Sealing systems . 22
4.1 Seal categories, types and arrangements . 22
4.2 Objectives . 24
4.3 Specifying and/or purchasing a sealing system . 24
5 General . 32
5.1 Unit responsibility . 32
5.2 Dimensions. 32
6 Design requirements . 32
6.1 Common design requirements (all categories) . 32
6.2 Design requirements (category-specific) . 59
7 Specific seal configurations . 62
7.1 Arrangement 1 seals . 62
7.2 Arrangement 2 seals . 63
7.3 Arrangement 3 seals . 66
8 Accessories . 69
8.1 General . 69
8.2 Piping for seal auxiliary systems . 71
8.3 Components of Seal Auxiliary Systems (if specified per Annex G) . 75
9 Instrumentation . 90
9.1 General . 90
9.2 Temperature-indicating gauges . 90
9.3 Thermowells . 91
9.4 Pressure indicators. 91
9.5 Transmitters and Switches . 91
9.6 Level indicators . 92
9.7 Flow instruments . 92
9.8 Relief valves . 93
9.9 Pressure control valves . 93
9.10 Pressure amplifiers . 93
10 Inspection, testing and preparation for shipment . 94
10.1 General . 94
10.2 Inspection . 94
10.3 Testing . 95
10.4 Preparation for shipment . 100
11 Data transfer . 101
11.1 General . 101
11.2 Data Requirement Forms . 102
11.3 Data Sheet . 102
11.4 Inspector Checklist . 102
Annex A (informative) Recommended seal selection procedure . 103
A.1 Assumptions and instructions . 103
© ISO 2009 – All rights reserved iii

DRAFT 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
A.2 Tutorial clause . 119
A.3 Tutorial seal selection — Sheet 6 . 124
A.4 Alternative seal Arrangement selection method using Material Safety Data Sheet
information. . 125
Annex B (informative) Typical materials and material specifications for seal chamber and
mechanical seal components . 134
B.1 Materials standards . 134
B.2 Seal rings and mating rings . 141
B.3 Secondary seals . 145
B.4 Throat and throttle bushings . 150
Annex C (informative) Mechanical seal data sheets . 152
Annex D (informative) Seal codes . 157
D.1 Introduction . 157
Mechanical seal coding construction . 157
D.3 Historical mechanical seal codes . 160
Annex E (informative) Intentionally Left Blank . 163
Annex F (informative) Technical tutorials and illustrative calculations . 164
F.1 Seal leakage and leakage management . 164
F.2 Seal chamber temperature rise and flush . 170
F.3 Cartridge sleeve drive collar set screw loading . 206
F.4 Rotating or stationary flexible element selection . 209
F.5 Throat and throttle bushings . 211
Annex G (normative) Standard flush plans and auxiliary hardware . 213
G.1 General . 213
G.2 Symbol library . 214
G.3 Plan 01 . 216
G.4 Plan 02 . 217
G.5 Plan 11 . 218
G.6 Plan 12 . 219
G.7 Plan 13 . 220
G.8 Plan 14 . 221
G.9 Plan 21 . 222
G.10 Plan 22 . 223
G.11 Plan 23 . 224
G.12 Plan 31 . 225
G.13 Plan 32 . 226
G.14 Plan 41 . 228
G.15 Plan 51 . 229
G.16 Plan 52 . 230
G.17 Plan 53A . 232
G.18 Plan 53B . 234
G.19 Plan 53C . 236
G.20 Plan 54A . 238
G.21 Plan 54B . 239
G.22 Plan 61 . 240
G.23 Plan 62 . 241
G.24 Plan 65A . 242
G.25 Plan 65B . 244
G.26 Plan 71 . 245
G.27 Plan 72 . 246
G.28 Plan 74 . 247
G.29 Plan 75 . 249
G.30 Plan 76 . 251
G.31 Plan 99 . 252
G.32 External barrier/buffer fluid reservoir . 252
G.33 Plan 23 circulation system . 255
G.34 Barrier/buffer fluid reservoir . 256
iv © ISO 2009 – All rights reserved

DRAFT 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
Annex H (informative) Inspectors' checklist for all seals . 259
Annex I (normative) Seal qualification testing protocol . 260
I.1 General . 260
I.2 Hierarchy and attributes of sealing systems . 263
I.3 Scope of test . 265
I.4 Test procedure . 269
Annex J (normative) Mechanical seals data requirement forms . 285
Bibliography . 288

© ISO 2009 – All rights reserved v

DRAFT 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
Foreword
ISO (the International 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 has 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. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21049 was prepared by Technical Committee ISO/TC 115, Pumps, Subcommittee SC 3, Installation and
special applications, in collaboration with Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, SC 6, Processing equipment and systems.
This second edition cancels and replaces the first edition (ISO 21049:2004), which has been technically
revised.
vi © ISO 2009 – All rights reserved

DRAFT 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
Introduction
This International Standard is based on the accumulated knowledge and experience of manufacturers and
users of equipment in the petroleum, natural gas and chemical industries, but its use is not restricted to these
industries.
Users of this International Standard should be aware that further or differing requirements may be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly appropriate where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this International Standard and provide details.
The purpose of this International Standard is to assist purchasers with the selection and operation of
mechanical seals for pumps.
In this International Standard, where practical, US Customary units are included in brackets for information.
A bullet (z) at the beginning of a clause or subclause indicates that either a decision is required or further
information is to be provided by the purchaser. This information should be indicated on data sheets or stated
in the enquiry or purchase order (see examples in Annex C).

© ISO 2009 – All rights reserved vii

DRAFT 2010

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oSIST prEN ISO 21049:2010
ISO/DIS 21049
Pumps — Shaft-sealing systems for centrifugal and rotary
pumps
1 Scope
This International Standard specifies requirements and gives recommendations for sealing
systems for centrifugal and rotary pumps used in the petroleum, natural gas and chemical
industries. It is applicable mainly for hazardous, flammable and/or toxic services where a greater
degree of reliability is required for the improvement of equipment availability and the reduction of
both emissions to the atmosphere and life-cycle sealing costs. It covers seals for pump shaft
diameters from 20 mm (0,75 in) to 110 mm (4,3 in).
This International Standard is also applicable to seal spare parts and can be referred to for the
upgrading of existing equipment. A classification system for the seal configurations covered by
this International Standard into categories, types, arrangements and orientations is provided.
This International Standard is a stand-alone seal standard and is referenced normatively in
ISO 13709. It is applicable to both new and retrofitted pumps, and to pumps other than
ISO 13709 pumps (e.g. ASME B73.1, ASME B73.2 and API 676 pumps).
This International Standard might also be referenced by other machinery standards such as other
pumps, compressors and agitators. Users
...