Nederlandse
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norm
NEN-EN 1591-4
Flanges and their joints - Design rules for gasketed circular flange connections Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive
Publicatie uitsluitend voor commentaar
november 2011 ICS 03.100.30; 23.040.60
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Commentaar vóór 2012-02-27 Zal vervangen NPR-CEN/TS 1591-4:2007
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Normcommissie 341048 "Metalen leidingflenzen"
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Als Europees normontwerp is gepubliceerd: prEN 1591-4:2011,IDT
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NEN-EN 1591-4:2011 Ontw.
DRAFT prEN 1591-4 rev
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
October 2011 ICS 03.100.30; 23.040.60
Will supersede CEN/TS 1591-4:2007
English Version
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Flanges and their joints - Design rules for gasketed circular flange connections - Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive
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Brides et leurs assemblages - Règles de calcul des assemblages à brides circulaires avec joint - Partie 4: Qualification des compétences du personnel en charge du montage des assemblages à brides boulonnés sur des équipements relevant de la directive Equipements sous pression
Flansche und ihre Verbindungen - Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und Dichtung - Teil 4: Qualifizierung der Befähigung von Personal zur Montage von Schraubverbindungen im Geltungsbereich der Druckgeräterichtlinie
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 74.
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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.
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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-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 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.
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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
© 2011 CEN
All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. prEN 1591-4 rev:2011: E
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NEN-EN 1591-4:2011 Ontw.
prEN 1591-4:2011 (E)
Contents
Page
Foreword ..............................................................................................................................................................3 Scope ......................................................................................................................................................4 General ....................................................................................................................................................4 Requirement for competency ...............................................................................................................4 Validity ....................................................................................................................................................4
2
Normative references ............................................................................................................................5
3
Terms and definitions ...........................................................................................................................5
4
Objective .................................................................................................................................................6
5
Training location ....................................................................................................................................6
6 6.1 6.2 6.3 6.3.1 6.3.2 6.3.3 6.3.4 6.3.5 6.3.6 6.3.7 6.3.8 6.3.9 6.4 6.5
Training syllabi.......................................................................................................................................7 Personnel with Work Based Learning .................................................................................................7 Syllabi content .......................................................................................................................................7 Bolting technicians ................................................................................................................................7 General ....................................................................................................................................................7 Foundation Level ...................................................................................................................................8 Hydraulic tension tightening ................................................................................................................8 Hydraulic torque tightening ..................................................................................................................9 Heat exchangers ....................................................................................................................................9 Brittle flanges ...................................................................................................................................... 10 Bolt load determination ...................................................................................................................... 10 Compact flanges, clamp joints and special connections ............................................................... 11 Small bore tubing connections ......................................................................................................... 11 Responsible persons ......................................................................................................................... 12 Technical authority ............................................................................................................................. 12
7
Format of training ............................................................................................................................... 12
8
Suitability of procedures and work instructions ............................................................................. 12
9
Effectiveness of training .................................................................................................................... 12
10 10.1 10.2 10.2.1 10.2.2 10.3
Competence assessment ................................................................................................................... 13 General ................................................................................................................................................. 13 Method of assessment ....................................................................................................................... 13 Theoretical question paper ................................................................................................................ 13 Simulated practical assessment ....................................................................................................... 13 Certificate ............................................................................................................................................ 13
11
Qualification of assessor ................................................................................................................... 13
12
Competence management ................................................................................................................. 13
13 13.1 13.2
Period of validity of certification ....................................................................................................... 14 Initial certification ............................................................................................................................... 14 Prolongation ........................................................................................................................................ 14
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1 1.1 1.2 1.3
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Bibliography ..................................................................................................................................................... 15
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NEN-EN 1591-4:2011 Ontw.
prEN 1591-4:2011 (E)
Foreword This document (prEN 1591-4:2011) has been prepared by Technical Committee CEN/TC 74 “Flanges and their joints”, the secretariat of which is held by DIN. This document is currently submitted to the CEN Enquiry.
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This document will supersede CEN/TS 1591-4:2007. To achieve the lowest possible emissions from a gasketed bolted connection a number of stages have to be completed sequentially. The most appropriate gasket for the service has to be selected, then the data to allow a calculation by the method of EN 1591-1 has to be obtained after which an EN 1591-1 calculation of the load required on the gasket to achieve the required level of sealing has to be made, then the gasketed bolted connection has to be assembled in a manner suitable for the gasket and connection type and finally the bolting shall be controlled tightened to the target bolt load using a procedure that ensures that on completion the load on the gasket is as required by the calculation. Only when all of these stages have been successfully completed will the emissions be as low as possible and will the risk of a failure of the connection be minimised.
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To ensure that the stages of assembly and controlled tightening are carried out in the best manner the personnel who assemble and tighten the gasketed bolted connection should be accredited as being competent to undertake that task. It is appreciated that throughout Europe various organisations provide training courses for personnel who will disassemble, assemble and tighten bolted joints but that subsequent competency assessment of those personnel does not generally occur. The integrity of a bolted joint is key in any pressure containment system and should be subjected to personnel competence. The aim of this document is to offer a procedure for the assessment of the competency after training of personnel who disassemble, assemble and tighten bolted joints.
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The procedure of assessment of competency is applicable to not only personnel tightening gasketed circular flange connections of equipment subject to the Pressure Equipment Directive 97/23/EC but to all gasketed bolted connections whatever their shape on any equipment or piping that will be used to contain a medium at any combination of pressure and temperature. EN 1591 "Flanges and their joints — Design rules for gasketed circular flange connections" consists of the following parts:
Part 2: Gasket parameters
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Part 1: Calculation method
Part 3: Calculation method for metal to metal contact type flanged joint (CEN/TS)
Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive A CEN/TR 1591-5 "Calculation method for full face gasketed joints" is under preparation for publication.
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NEN-EN 1591-4:2011 Ontw.
prEN 1591-4:2011 (E)
1 1.1
Scope General
This European Standard establishes a procedure for the competency assessment of personnel who disassemble, assemble and tighten bolted joints such as fitted to equipment subject to the Pressure Equipment Directive 97/23/EC (PED), in the content of this Standard named "PED".
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However, the procedure can be used to assess the competency of personnel tightening all types of gasketed bolted connections whatever their shape on any equipment or piping that will be used to contain a medium at any combination of pressure and temperature. Certification to this European Standard provides an attestation of general competency in accordance with the stated syllabi and assessments. Certification to this European Standard does not represent an authorisation to operate, since this remains the responsibility of the employer, and the certified person may require additional specialised knowledge of employer-specific procedures, processes and equipment.
1.2
Requirement for competency
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Training and competence, experience and knowledge are often confused with each other. Training is no guarantor of competence, nor is experience a guarantor of knowledge and understanding. Training, experience, and assessment of the ability to apply knowledge are all required to achieve competence. Design codes for mechanical joints such as EN 1591-1 increasingly require controlled bolt tightening in order to meet the specified bolt load tolerances.
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The intent of this European Standard is to ensure personnel, both technicians and supervisors, are competent to disassemble, inspect, assemble and tighten bolted joints using the design bolt load and documented work instructions, thereby establishing a joint capable of maintaining a leak-free status throughout its’ service life.
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Competency in the analysis of joint failure is not required beyond use of knowledge gained during training. A correctly assembled and tightened joint that fails in service requires specialist knowledge to understand why the failure occurred and is out with the scope of this European Standard.
Validity
This European Standard is applicable for bolted joints included on mechanical equipment subject to the PED or any joint where failure would endanger personnel, plant or the environment.
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1.4 Quality management system
Manufacturers or operators need to develop and include a procedural framework within their quality management system to meet the requirements of this specification. Such a framework needs to address:
identification of a competent training provider
evaluation of the effectiveness of the training for each person undergoing training.
assessment of competence of personnel
register of date that competency was achieved
For examples, refer to EN ISO 9001:2008, 6.2.2.
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