ISO 14084-1:2015

INTERNATIONAL ISO
STANDARD 14084-1
First edition
2015-06-01
Process diagrams for power plants —
Part 1:
Specification for diagrams
Schémas de procédés pour centrales électriques —
Partie 1: Spécifications pour diagrammes
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic aspects for process diagrams for power plants . 2
4.1 General . 2
4.2 Diagram types and interrelations . 2
4.3 Life cycle aspects . 3
4.4 Contents of information in diagrams . 3
5 Diagram types and content . 4
5.1 General . 4
5.2 Block diagram (BLD). 4
5.2.1 Description . . . 4
5.2.2 Application . 4
5.2.3 Contents . . 4
5.2.4 Representation . 5
5.3 Process flow diagram (PFD) . 5
5.3.1 Description . . . 5
5.3.2 Application . 5
5.3.3 Contents . . 5
5.3.4 Representation . 6
5.3.5 Other types of process flow diagrams . 6
5.4 Process and instrumentation diagram (PID) . 7
5.4.1 Description . . . 7
5.4.2 Application . 7
5.4.3 Contents . . 7
5.4.4 Representation . 8
5.5 Process control diagram . 8
5.5.1 Description . . . 8
5.5.2 Application . 8
5.5.3 Contents . . 8
5.5.4 Representation . 9
5.6 Typical diagram . 9
5.6.1 Description . . . 9
5.6.2 Application . 9
5.6.3 Contents . . 9
5.6.4 Representation .10
6 Representation subjects .10
6.1 General .10
6.2 Document sheet issues .10
6.3 Technical information .10
6.4 Graphical symbols .11
6.4.1 General.11
6.4.2 Graphical symbols for power plant diagrams .11
6.4.3 Extension of information .11
6.4.4 Combination of graphical symbols .12
6.4.5 Representation of complex/large objects in diagrams .12
6.5 Connections .12
6.5.1 General.12
6.5.2 Indication of flow directions .13
6.5.3 Indication of pipe dimension .13
6.5.4 Change of dimension on pipelines .13
6.5.5 Representation of connection lines .13
6.6 Measurement and control .14
6.7 Non-object symbols .14
6.8 Reference designation .14
6.8.1 General.14
6.8.2 Representation and location . .14
6.8.3 Reference designations for pipelines .15
Annex A (informative) Non-object symbols, etc. .16
Annex B (informative) Diagram examples .18
Annex C (informative) Reference designation for power plants .25
Annex D (informative) Reference designation symbols .27
Bibliography .28
iv © ISO 2015 – All rights reserved

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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received
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