NEN EN 12952-7 : 2012

1 Scope
2 Normative references
3 Terms and definitions
  3.1 Types of steam boilers and hot water generators
  3.2 Limits of steam boilers and hot water generators
  3.3 Steam boilers and hot water generating plant
  3.4 Heat supply system
  3.5 Classification of pressure generation systems (Hot
       water generators)
  3.6 Expansion system (vessel and tank)
  3.7 Sinking time
  3.8 Maximum continuous rating (MCR)
  3.9 Allowable heat output
  3.10 Maximum allowable pressure
  3.11 Allowable flow temperature
  3.12 Controls
  3.13 Limiters
  3.14 Fail-safe
  3.15 Self-monitoring
  3.16 Redundancy
  3.17 Independent
  3.18 Reliability
  3.19 Lock-out
  3.20 Unit test
  3.21 Functional test
  3.22 Permanent supervision
4 General requirements for steam boilers and hot water
  generators
  4.1 Safeguards against excessive pressure
  4.2 Heat supply system
  4.3 Ash removal plants
  4.4 Flue-gas cleaning plants
  4.5 Requirements for limiting devices and safety circuits
  4.6 Cleaning, access and inspection openings
  4.7 Feed lines and protection against feedwater backflow
  4.8 Connection of steam boilers or hot water generators
5 Special requirements for steam boilers
  5.1 Requirements for pumps
  5.2 Isolating and drain devices
  5.3 Lowest permissible water level (LWL)
  5.4 Water level and flow indicators
  5.5 Water supply control and protective device against
       water shortage
  5.6 Pressure and temperature measuring devices
5.7 Marking
6 Special requirements for hot water generators
  6.1 Requirements for hot water generating systems
  6.2 Requirements for pumps
  6.3 Shut-off and drain devices
  6.4 Lowest permissible water level and installation of
       flow and return line
  6.5 Water level and flow indicators
  6.6 Water supply and drain control, protective device
       against water shortage
  6.7 Safeguards against minimum pressure
  6.8 Safety device for temperature control
  6.9 Pressure and temperature indicating devices
  6.10 Marking
7 Additional requirements for plants without permanent
  supervision
  7.1 General
  7.2 Steam boilers
  7.3 Hot water generators
8 Final assessment of safety devices
  8.1 Performance of inspection
  8.2 Equipment on the steam and water side
  8.3 Firing system equipment
  8.4 Electrical safety circuit
  8.5 Operating instructions
9 Small plant boilers
  9.1 Steam boilers
  9.2 Hot water generators
Annex A (normative) Chemical recovery boilers (Black liquor
         recovery boilers)
Annex B (informative) Design examples for hot water generating
         systems
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other provisions
         of the Pressure Equipment Directive