NDT STANDARDS
Contents
• What are standards and why are they important?
• The changing status of standards
• Where standards are developed
• Who develops standards?
• Stages in developing a standard
• Main non-destructive testing committees and their work
• Summary
What is a formal standard?
standard
document, established by consensus and
approved by a recognized body, that provides, for
common and repeated use, rules, guidelines or
characteristics for activities or their results, aimed
at the achievement of the optimum degree of
order in a given context
NOTE Standards should be based on the consolidated
results of science, technology and experience, and aimed at
the promotion of optimum community benefits.
[ISO/IEC Guide 2:1996, definition 3.2]
Standards help by
• Assisting innovation
• Enabling UK ideas to become accepted
internationally
• Balancing producer and user interests
Assisting innovation
• By sharing best practice, so designers can
focus on real product enhancement
• By setting benchmarks for performance,
quality & safety
• By establishing parameters for interoperability
• By making transparent technical requirements
that innovative products should meet to gain
global market acceptance
Acceptance of UK ideas internationally
• British Standards has a leading role in
CEN/CENELEC & ISO/IEC
• UK representatives and experts have an good
record in standards development
• British national standards have been the
basis of some of the most important world
standards
• Export of UK ideas opens up overseas
markets and raises the profile of UK industry
and commerce.
Balancing producer and user interests
Formal standards
• Are market led
• Reflect all interests, including small and medium
sized companies, consumers and the
environment
• Promote fair competition to counteract unhealthy
concentrations of economic power
• Reduce development, production and transaction
costs for both established and new businesses
The changing status of standards
• National standards (BS) – most voluntary. Useful as
quicker to prepare and may be used as UK proposal.
• European standards (EN) – have to be implemented
and conflicting National standards withdrawn
• Mandated European Standards can be a way – and in
some cases the only way - to show compliance with
EU directives
• International standards (ISO / IEC) – no obligation to
implement
• Increasingly dual European / International standards
to give global coverage (EN ISO)
Where standards are developed
ISO/IEC
International
Europe
Regional
National
Members
CEN/CENELEC
BSI
Industrial
Commercial
Public Sector
etc Members
DIN
AFNOR
etc
Who develops standards (1)
Who develops standards (1)
Consumer
ConsumerBodies
Bodies
Trade
Trade
Associations
Associations
Certification
Certification
Bodies
Bodies
Professional
Professional
Institutions
Institutions
Standards’
Standards’Users
Users
British
BritishStandards
Standards
Technical
TechnicalCommittee
Committee
Research
Research
Organizations
Organizations
Government
Government
Departments
Departments
Public
PublicSector
Sector
Enforcement
EnforcementBodies
Bodies
Educational
Educational
Bodies
Bodies
Who develops standards (2)
• People like you develop standards
• We need you to become involved during the
development stages
• In addition, it is vital that the UK is
represented by technical experts at European
and International meetings to promote UK
views
Stages in developing a standard
Stages in developing a standard
Initiation
Drafting
Public
Comment
Review
Publish
CEN/TC 138 Non-destructive testing
•
WG 1 – Ionizing radiations
•
WG 2 – Ultrasonics
•
WG 3 – Eddy currents
•
WG 4 – Penetrant testing
•
WG 5 – Magnetic particle testing
•
WG 6 – Leak testing
•
WG 7 – Acoustic emission
•
WG 8 – Visual testing
•
WG 9 – Methodology for qualification of NDT tests
•
WG 10 - X-ray diffraction
Each CEN/TC 138 Working Group
The general work items for each WG are:
• Terminology
• General principles
• Equipment
Work items under main committee
• EN 473 – Qualification & certification of personnel
• Recertification of personnel
• Training syllabuses
• Discontinuity types to be exhibited in test specimens
• Guidelines for NDT training organizations
• Determination of stress by neutron diffraction
• Terminology – general terms
• General format for NDT data
WG 6 Leak testing
• EN 1779 – Guide to method selection
• EN 13185 – Tracer gas method
• EN 1593 – Bubble emission method
• EN 13184 – Pressure change method
• EN 1518 – Characterization of mass
spectrometer leak detector
• EN 13192 – Calibration of gaseous reference
leaks
• EN 13625 – Selection of instrumentation
• EN 1330-8 – Terminology
SUMMARY
•
What standards are and why they are important
•
The changing status of standards
•
Where standards are developed
•
Those who develops standards
•
Stages in developing a standard
Final word
Standards should be prepared
by those who will use them