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BS EN 12953-9:2007

Current

Current

The latest, up-to-date edition.

Shell boilers Requirements for limiting devices of the boiler and accessories

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-08-2007

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for limiter
  4.1 General
  4.2 Materials and design
  4.3 Electrical equipment
  4.4 Fault assessment
  4.5 Marking
5 Special requirements for water level limiters
  5.1 Components
  5.2 Design
  5.3 Floating devices
  5.4 Level electrode devices
  5.5 Examination of functional capability
  5.6 Fault detection
6 Special requirements for pressure limiters
  6.1 Components
  6.2 Additional fault assessment requirements
  6.3 Design
  6.4 Electrical equipment
  6.5 Examination of functional capability
  6.6 Fault detection
7 Special requirements for temperature limiters
  7.1 Components
  7.2 Design
  7.3 Electrical equipment
  7.4 Examination of functional capability
8 Special requirements for flow limiters
  8.1 Components
  8.2 Design
  8.3 Electrical equipment
  8.4 Examination of functional capability
Annex A (informative) Limiting device
Annex B (informative) Example of an examination plan
Annex C (informative) Marking of limiters
Annex D (normative) Immunity against electrical and electromagnetic
        influences - Requirements and testing
      D.1 General
      D.2 Immunity against mains voltage variations
      D.3 Immunity against short-time voltage interruptions and
           reductions
      D.4 Immunity against mains frequency changes
      D.5 Immunity against electrostatic discharge (ESD)
      D.6 Immunity against fast transient disturbance variables
           (burst)
      D.7 Immunity against surges
      D.8 Immunity against high-frequency electromagnetic fields
      D.9 Immunity against conducted disturbances induced by
           high frequency fields
      D.10 Immunity against power frequency magnetic fields
Annex ZA (informative) Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 97/23/EC
Bibliography

Describes requirements for limiters (or limiting devices) which are incorporated into safety systems for shell boilers as defined in EN 12953-1.

Committee
PVE/2
DocumentType
Standard
Pages
40
PublisherName
British Standards Institution
Status
Current

This European Standard specifies requirements for limiters (or limiting devices) which are incorporated into safety systems for shell boilers as defined in EN 12953-1.

A limiter (or limiting device) can be either:

  • a safety accessory as defined in the Pressure Equipment Directive, Article 1, clause 2.1.3, and needs to include the safety logic and final actuator, or

  • one element of a safety system, for example, a self-monitoring water level sensor used as part of a safety accessory as defined in the Pressure Equipment Directive, Article 1, clause 2.1.3. The overall boiler protection function needs to be provided in association with additional safety logic (where appropriate) and a final actuator.

The design requirements and examination of functional capability for the limiters are covered in this European Standard.

For an explanation of the extent of the limiter (or limiting device) see Figure A.1.

Standards Relationship
I.S. EN 12953-9:2007 Identical
UNI EN 12953-9 : 2007 Identical
NS EN 12953-9 : 1ED 2007 Identical
SN EN 12953-9 : 2007 Identical
NF EN 12953-9 : 2007 Identical
DIN EN 12953-9:2007-09 Identical
NEN EN 12953-9 : 2007 Identical
EN 12953-9:2007 Identical
NBN EN 12953-9 : 2007 Identical

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