NEN EN 12953-9 : 2007
Current
The latest, up-to-date edition.
SHELL BOILERS - PART 9: REQUIREMENTS FOR LIMITING DEVICES THE BOILER AND ACCESSORIES
12-01-2013
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.
| DocumentType |
Standard
|
| PublisherName |
Netherlands Standards
|
| Status |
Current
|
| Standards | Relationship |
| EN 12953-9:2007 | Identical |
| DIN EN 12953-9:2007-09 | Identical |
| BS EN 12953-9:2007 | Identical |
| UNI EN 12953-9 : 2007 | Identical |
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