PREN 12953-6 : DRAFT 2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements for steam boilers and hot water boilers
   4.1 Safeguards (safety valves) against excessive pressure
   4.2 Materials for valves, fittings, flanges and bolting
   4.3 Protective systems
   4.4 Heat supply
   4.5 Flue-gas heated economizers
   4.6 Drain and blowdown devices
   4.7 Water quality
   4.8 Water quality protection
5 Special requirements for steam boilers
   5.1 Water level indication
   5.2 Steam pressure and temperature indication
   5.3 Valves for connections
   5.4 Feed water supply
   5.5 Feed water control
   5.6 Limiting devices
   5.7 Electrically heated steam boilers
6 Special requirements for hot water boilers
   6.1 Hot water generating systems
   6.2 Expansion and feed lines for open vented systems
   6.3 Water supply
   6.4 Water level indication
   6.5 Limiting devices
   6.6 Vent valves
   6.7 Pressure and temperature indication
   6.8 Pressure controller
   6.9 Discharge from safety valves
   6.10 Electrically heated hot water boilers
   6.11 Parallel mode of operation of hot water boilers
7 Operational aspects
8 Alarms and monitoring from the boiler plant
Annex A (informative) - Examples of steam and hot water boiler
        systems
Annex B (normative) - Dimensioning of expansion space
Annex C (informative) - Aspects of boiler operation
Annex D (informative) - Drain and blowdown devices
Annex E (informative) - Alarms and monitoring from the boiler
        plant
Annex ZA (informative) - Relationship between this European Standard
         and the Essential Requirements of EU Directive 97/23/EC
Bibliography

Defines the minimum requirements for safety related equipment for shell boilers as defined in EN 12953-1, to ensure the boiler operates within the allowable limits (pressure, temperature, etc.) and if the limits are exceeded will interrupt and lock out the energy supply without manual (human) intervention at the boiler.