PREN 12845 : DRAFT 2001

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Contract planning and documentation
   4.1 General
   4.2 Initial considerations
   4.3 Preliminary or estimating stage
   4.4 Design stage
5 Extent of sprinkler protection
   5.1 Building and areas to be protected
   5.2 Storage in the open area
   5.3 Fire resisting compartments
   5.4 Protection of concealed spaces
6 Classifications of occupancies and fire hazards
   6.1 General
   6.2 Hazard classes
   6.3 Storage
7 Hydraulic design criteria
   7.1 LH, OH and HHP
   7.2 High hazards storage - HHS
   7.3 Pressure and flow requirements for precalculated
        systems
8 Water supplies - General
   8.1 Suitability
   8.2 Connections for other services
   8.3 Housing of equipment for water supplies
   8.4 Test facility devices
   8.5 Pressure/flow tests on water supplies
   8.6 Water supplies pressure test
9 Choice of water supply
   9.1 General
   9.2 Town mains
   9.3 Storage tanks
   9.4 Inexhaustible sources
   9.5 Pressure tanks
   9.6 Type of water supply
   9.7 Isolation of water supply
10 Pumps
   10.1 General
   10.2 Multiple pump arrangements
   10.3 Compartments for pump sets
   10.4 Maximum temperature of water supply
   10.5 Valves and accessories
   10.6 Suction conditions
   10.7 Performance characteristics
   10.8 Electricity driven pump sets
   10.9 Diesel engine driven pump sets
11 Installation type and size
   11.1 Wet pipe Installations
   11.2 Dry pipe Installations
   11.3 Alternate Installations
   11.4 Pre-actions Installations
   11.5 Subsidiary dry pipe or alternate extension
   11.6 Subsidiary water spray extension
12 Spacing and location of sprinklers
   12.1 General
   12.2 Maximum area of coverage per sprinkler
   12.3 Maximum distance between sprinklers
   12.4 Location of sprinklers in relation to building
        construction
   12.5 Intermediate sprinklers in HH occupancies
13 Pipe sizing and layout
   13.1 General
   13.2 Calculation of pressure losses in pipework
   13.3 Pre-calculated systems
   13.4 Fully calculated systems
14 Sprinkler design characteristics and uses
   14.1 General
   14.2 Sprinkler types and application
   14.3 Flow from sprinklers
   14.4 Sprinkler temperature ratings
   14.5 Sprinkler thermal sensitivity
   14.6 Sprinkler guards
   14.7 Sprinkler water shields
   14.8 Sprinkler escutcheon plates
   14.9 Corrosion protection of sprinklers
15 Valves
   15.1 Control valve sets
   15.2 Stop valves
   15.3 Ring main valves
   15.4 Drain valves
   15.5 Test valves
   15.6 Flushing connections
   15.7 Pressure gauges
16 Alarms and alarm devices
   16.1 Water flow alarm
   16.2 Electrical water flow and pressure switches
17 Pipework
   17.1 General
   17.2 Pipe supports
   17.3 Pipe work in concealed spaces
18 Signs, notices and information
   18.1 Block plan
   18.2 Signs and notices
19 Commissioning and acceptance tests
   19.1 Commissioning tests
   19.2 Completion certificate and documents
20 Maintenance
   20.1 General
   20.2 Action following sprinkler operation
   20.3 User's programme of inspection and checking
   20.4 Services and maintenance schedule
Annexes
Annex A (normative) Classification of typical hazards
Annex B (normative) Methodology for categorising stored goods
Annex C (normative) Alphabetic listing of stored products and
                    categories
Annex D (normative) Zoning of sprinkler installations
Annex E (normative) Special requirements for high rise systems
Annex F (normative) Special requirements for life safety systems
Annex G (normative) Protection of special hazards
Annex H (normative) Sprinkler systems monitoring
Annex J (normative) Special technology

Gives requirements for the design, installation and maintenance of fixed fire sprinkler systems in building and industrial plant.