SIST EN 764-2:2012

Pressure equipment - Part 2: Quantities, symbols and units

This European Standard specifies the basic quantities, symbols and units to be used for pressure equipment and assemblies addressed by the European Directive 97/23/EC.

Druckgeräte - Teil 2: Größen, Symbole und Einheiten

Diese Europäische Norm definiert die wesentlichen Größen, Symbole und Einheiten, die für Druckgeräte und deren Baugruppen gemäß der Europäischen Richtlinie 97/23/EG zu verwenden sind.

Equipements sous pression - Partie 2: Grandeurs, symboles et unités

Cette norme européenne spécifie les grandeurs de base, symboles et unités utilisés pour les équipements sous pression et les ensembles concernés par la Directive Européenne 97/23/CE.

Tlačna oprema - 2. del: Veličine, simboli in enote

Ta evropski standard določa osnovne veličine, simbole in enote, ki se uporabljajo za tlačno opremo in sklope, obravnavane v evropski Direktivi 97/23/ES.

General Information

• Status: Published
• Public Enquiry End Date: 19-Oct-2010
• Publication Date: 18-Apr-2012
• ICS: 01.060 - Quantities and units
• ICS: 23.020.32 - Pressure vessels
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 22-Mar-2012
• Due Date: 27-May-2012
• Completion Date: 19-Apr-2012
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Ref Project: EN 764-2:2012 - Pressure equipment - Part 2: Quantities, symbols and units

Relations

• Replaces: SIST EN 764-2:2002 - Pressure equipment - Part 2: Quantities, symbols and units
• Effective Date: 01-May-2012

Overview

SIST EN 764-2:2012 is a key European Standard developed by CEN that defines the basic quantities, symbols, and units to be used for pressure equipment and assemblies. This standard is essential for compliance with the European Directive 97/23/EC, which governs pressure equipment safety throughout the EU. By standardizing terminology and unit usage, SIST EN 764-2:2012 ensures clear communication and uniform documentation across all stakeholders involved in pressure equipment design, manufacture, inspection, and operation.

The standard supersedes EN 764-2:2002 and aligns with international measurement systems including the International System of Units (SI units) and relevant ISO standards, particularly from the ISO 80000 series which cover quantities and units for natural sciences and technology.

Key Topics

• Basic Quantities and Symbols
  SIST EN 764-2:2012 specifies standard symbols for physical quantities such as time, length, pressure, force, temperature, and mechanical stress relevant to pressure equipment. It ensures these symbols match international guidelines while accommodating specific industry needs.

• Units of Measurement
  The units prescribed are primarily SI units, complemented by suitable decimal multiples or submultiples to keep numerical values within practical, manageable ranges (typically between 0.1 and 1000). For example, pressure is commonly expressed in bar or MPa, with one bar equal to 0.1 MPa.

• Tables of Quantities and Units
  The standard includes detailed tabulations covering:

  • General quantities (time, length, volume, density, power, angle, etc.)
  • Mechanical and thermodynamic quantities (force, moment, stress, temperature, modulus of elasticity, hardness, safety factors, etc.)

• References to ISO Standards
  SIST EN 764-2:2012 references the ISO 80000 series, which define the scientific basis for quantities and units, ensuring compatibility and coherence with international measurement standards used in engineering and technology.

• Compliance with Pressure Equipment Directive
  The standard supports the requirements of Directive 97/23/EC, ensuring that all pressure equipment across European markets adheres to a consistent system of measurement and symbol usage for safety, certification, and interoperability.

Applications

• Pressure Vessel Design and Manufacturing
  Designers and engineers utilize SIST EN 764-2:2012 to apply correct units and symbols consistently in technical drawings, specifications, and calculations for pressure vessels and gas cylinders.

• Regulatory Compliance and Certification
  Manufacturers and certification bodies rely on this standard to meet mandatory European regulations and facilitate smooth approval processes for pressure equipment.

• Inspection and Quality Assurance
  Inspectors and quality control teams use the standardized quantities and symbols to interpret technical data, verify compliance, and ensure safe operation of pressure assemblies.

• Technical Documentation and Communication
  The standard ensures that documentation such as operating instructions, safety datasheets, and maintenance manuals communicate measurements effectively to all stakeholders, including international audiences.

• Instrumentation and Gauging
  The use of consistent units and symbols is critical in the calibration and installation of pressure gauges, temperature sensors, and other instrumentation devices used in pressure equipment monitoring.

Related Standards

• EN 764 Series

  • Part 1: Terminology – Pressure, temperature, volume, and nominal size
  • Part 3: Definition of parties involved
  • Part 4: Technical delivery conditions for metallic materials
  • Part 5: Compliance and Inspection Documentation of Materials
  • Part 6: Structure and content of operating instructions
  • Part 7: Safety systems for unfired pressure equipment

• ISO 80000 Series

  • Part 1: General quantities and units
  • Part 2: Mathematical signs and symbols
  • Part 3: Space and time
  • Part 4: Mechanics
  • Part 5: Thermodynamics
  • Part 11: Characteristic numbers

• Pressure Equipment Directive 97/23/EC
  The overarching EU legislation governing safety and conformity requirements for pressure equipment.

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By harmonizing the use of quantities, units, and symbols, SIST EN 764-2:2012 plays a crucial role in ensuring safety, consistency, and interoperability in the pressure equipment industry. Adhering to this standard helps professionals achieve seamless communication, regulatory compliance, and enhanced product safety across all European markets.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2012
1DGRPHãþD
SIST EN 764-2:2002
7ODþQDRSUHPDGHO9HOLþLQHVLPEROLLQHQRWH
Pressure equipment - Part 2: Quantities, symbols and units
Druckgeräte - Teil 2: Größen, Symbole und Einheiten
Equipements sous pression - Partie 2: Grandeurs, symboles et unités
Ta slovenski standard je istoveten z: EN 764-2:2012
ICS:
01.060 9HOLþLQHLQHQRWH Quantities and units
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 764-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2012
ICS 01.060; 23.020.30 Supersedes EN 764-2:2002
English Version
Pressure equipment - Part 2: Quantities, symbols and units
Equipements sous pression - Partie 2: Grandeurs, Druckgeräte - Teil 2: Größen, Symbole und Einheiten
symboles et unités
This European Standard was approved by CEN on 9 December 2011.

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. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN-CENELEC 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, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 764-2:2012: E
worldwide for CEN national Members.

Contents
page
Foreword . 3
1 Scope . 4
2 Normative references . 4
3 General . 4
4 Quantities, symbols and units . 4

Foreword
This document (EN 764-2:2012) has been prepared by Technical Committee CEN/TC 54 “Unfired pressure
vessels”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by July 2012, and conflicting national standards shall be withdrawn at the
latest by July 2012.
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 EN 764-2:2002.
This European Standard consists of seven parts which are:
Part 1 Terminology – Pressure, temperature, volume and nominal size;
Part 2 Quantities, symbols and units;
Part 3 Definition of parties involved;
Part 4 Establishment of technical delivery conditions for metallic materials;
Part 5 Compliance and Inspection Documentation of Materials;
Part 6 Structure and content of operating instructions;
Part 7 Safety systems for unfired pressure equipment.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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, Turkey and the United Kingdom.

1 Scope
Thi
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