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eLibrary > BS 9251:2021 - TC Tracked Changes. Fire sprinkler systems for domestic and residential occupancies. Code of practice >

BS 9251:2021 - TC Tracked Changes. Fire sprinkler systems for domestic and residential occupancies. Code of practice, 2021

Summary of pages
Foreword [Go to Page]
Publishing information
Supersession
Relationship with other publications
Information about this document
Use of this document
Presentational conventions
Contractual and legal considerations [Go to Page]
Compliance with a British Standard cannot confer immunity from legal obligations.
Compliance with a British Standard cannot confer immunity from legal obligations.
1 Scope
2 Normative references [Go to Page]
Standards references
Other references
3 Terms and definitions [Go to Page]
3.1 alarm device
3.2 alarm receiving centre
3.3 alarm test valve
3.4 area of operation
3.5 authority having jurisdiction (AHJ)
3.6 backflow
3.7 backflow prevention device
3.8 compartment
3.8 building height
3.9 client
3.10 compartment
3.93.11 competent person
3.103.12 concealed sprinkler
3.113.13 crawl space
3.123.14 design density
3.133.15 effective capacity
3.143.16 fusible link sprinkler
3.153.17 glass bulb sprinkler
3.163.18 hydraulically most favourable area
3.173.19 hydraulically most unfavourable area
3.153.20 mains water supply
3.153.21 maximum flow demand
3.203.22 pendent sprinkler
3.213.23 priority demand valve
3.223.24 pump
3.233.25 recessed sprinkler
3.243.26 residential pattern sprinkler
3.253.27 service pipe
3.28 shadow area
3.263.29 sidewall pattern sprinkler
3.273.30 sprinkler system
3.283.31 stop valve
3.283.32 stored water supply
3.303.33 upright sprinkler
3.313.34 vulnerable people
3.323.35 water undertaker
3.333.36 wholesome water
4 Preliminary work and consultation [Go to Page]
4.1 Initial considerations
4.2 Consultation [Go to Page]
4.2.4 Resilience of system
4.3 Category of system [Go to Page]
The category of system should be determined by the type of building as shown in Table 1, up to a maximum height of 45 m. If the type of building is not listed in Table 1, or for buildings over 45 m, then the AHJ(s) should be consulted to agree which t...
4.4 Use of sprinklers as a compensatory feature
4.5 Special circumstances [Go to Page]
4.3 Category of system
5 Design [Go to Page]
5.1 General
5.2 System type
5.3 Design density and duration of supply [Go to Page]
5.3.1 General
5.3.2 Minimum design parameters
5.3.3 System flow rate [Go to Page]
5.4 Extent of sprinkler protection
5.5 Sprinkler coverage and positioning
5.5 Classification of residential and non-residential occupancies [Go to Page]
5.6 Residential pattern sprinkler heads
5.6.1 General
5.6.2 Minimum operating pressure and flow
5.6.3 Temperature rating of sprinklers
5.6.4 Sprinkler connection
5.6 Ordinary hazard protected areas
5.7 Hydraulic calculations
5.7 Sprinkler coverage and positioning [Go to Page]
5.7.1 General
5.7.2 Permitted obstruction to residential sprinklers
5.8 Water supplies [Go to Page]
5.8.1 General
5.8.2 Types of supply
5.8.3 Mains water supply
5.8.3.1 General
5.8.3.2 Design flow rate for mains water supply connections
5.8.3.3 Supply pipe sizing
5.8.4 Stored water supply
5.8.4.1 General
5.8.4.2 Stored water capacity [Go to Page]
Figure 1 Stored water supply
5.8.4.3 Dedicated stored water supply
5.8.4.4 Shared stored water supply
5.8.4.5 Reduced capacity of stored water supply
5.8.5 Backflow prevention
5.8 Ceiling pockets
5.9 Pumps
5.9.1 General
5.9.2 Combined sprinkler and domestic supply pump
5.9.3 Dedicated sprinkler pump
5.9 Residential pattern sprinkler heads [Go to Page]
5.9.1 General
5.9.2 Minimum operating pressure and flow
5.9.3 Temperature rating of sprinklers
5.9.4 Sprinkler connection
5.10 Pipes and fittings
5.10 Hydraulic calculations
5.11 Valves
5.11 Water supplies [Go to Page]
5.11.1 General
5.11.2 Types of supply
5.11.3 Mains water supply
5.11.3.1 General
5.11.3.2 Design flow rate for mains water supply connections
5.11.3.3 Supply pipe sizing
5.11.4 Stored water supply
5.11.4.1 General
5.11.4.2 Stored water capacity [Go to Page]
5.11.4.3 Dedicated stored water supply
5.11.4.4 Shared stored water supply
5.11.4.5 Reduced capacity of stored water supply
5.11.5 Backflow prevention
5.12 Frost protection
5.12 Pumps
5.12.1 General [Go to Page]
5.12.2 Electrical supply
5.12.3 Combined sprinkler and domestic supply pump
5.12.4 Dedicated sprinkler pump
5.12.5 Enhanced water supply [Go to Page]
5.12.5.1 General
5.12.5.2 Option 1
5.12.5.3 Option 2
5.13 Alarm system
5.13.1 General
5.13.2 Alarm devices
Whilst in some domestic and residential buildings the actuation of the fire alarm triggers immediate and total evacuation of the premises other residential buildings are designed so that the initial alarm is sounded only in the dwelling where the fire...
b) interfaced with an automatic fire detection and alarm system. Where the property is fitted with an automatic fire detection and alarm system to at least the minimum grade and category recommended in BS 5839, the sprinkler alarm device may be interf...
5.13.3 Multi-storey blocks of flats
a) The alarm zone should cover no more than a single floor.
b) The individual dwellings should be fitted with an LD1 automatic fire detection and alarm system with a minimum of a grade D power supply, designed, installed and maintained in accordance with BS 5839-6:2013.
c) The sprinkler alarm device should be connected to suitable control and indicating equipment so that management are alerted and the emergency action plan can be initiated.
5.13.4 Transmission of alarm signals to alarm receiving centres
5.13.5 Electrically operated alarm devices
5.13 Pipes and fittings
5.14 Flexible sprinkler connection
5.15 Valves
5.16 Pressure reducing valves
5.17 Frost protection
5.18 Sprinkler system fire and fault alarm functionality
5.18.1 General
5.18.2 Fault alarms [Go to Page]
5.18.3 Sprinkler fire alarms [Go to Page]
5.18.3.1 All buildings
5.18.3.2 Additional recommendations for multi-storey blocks of flats
5.18.3.3 Electrically operated alarm and fault devices
6 Installation, commissioning and documentation [Go to Page]
6.1 Installation [Go to Page]
6.1.1 General
6.1.2 Pipework
6.1.2.1 General
6.1.2.2 Pipework support
6.1.2.3 Pipework through structural timbers
6.1.2.3 Pipework through construction elements
6.1.3 Sprinkler heads
6.2 Commissioning [Go to Page]
6.2.1 General
6.2.2 Leakage test
6.2.3 Hydraulic test
6.2.4 Alarm test
6.2.5 Compliance certificate
6.2 Commissioning [Go to Page]
6.2.1 General
6.2.2 System air purge
6.2.3 Leakage test
6.2.4 Hydraulic test
6.2.5 Alarm test
6.2.6 Compliance certificate
6.3 Documentation [Go to Page]
6.3.1 Presentation
6.3.2 Log book
6.3.3 Documents
6.3.3 Operation and maintenance (O&M) manual
6.4 System data label
6.4 Block plan
6.5 System data label
6.6 Location plate
7 Maintenance [Go to Page]
7.1 Inspecting and testing [Go to Page]
7.1.1 General
7.1.2 Yearly routine
7.1.3 Long-term inspection and testing
Annex A (informative)
Annex B (normative)
Hydraulic calculations [Go to Page]
B.1 Static pressure
B.2 Flow from a sprinkler head
B.3 Pipe friction loss
B.5 Pressure loss through fittings and valves
B.6 Maximum flow demand calculation
B.7 Sprinkler head layout and hydraulic design process [Go to Page]
EXAMPLE
Annex C (normative)
Hydraulic calculations [Go to Page]
C.1 Static pressure
CC.2 Flow from a sprinkler head
C.3 Pipe friction loss
C.4 Pressure loss through fittings and valves [Go to Page]
Table C.2a K values for carbon steel tube conforming to BS EN 10255, Medium series
Nominal diameter (mm) Internal diameter (mm) Value of K
Table C.2c K values for copper tube conforming to BS EN 1057:2006+A1, half-hard, R250 designation
Table C.3a Typical equivalent lengths for steel fittings and valves
Table C.3b Typical equivalent lengths for CPVC fittings and valves
Table C.3c Typical equivalent lengths for copper fittings and valves
C.5 Maximum flow demand calculation
Annex F C (informative)
Example of system data label
Annex D (normative)
Pipework support
Annex E (informative)
Hydraulic test
Annex F (normative)
Bibliography [Go to Page]
Standards publications
Other publications
Tracked_Changes_Cover_Markup_new.pdf [Go to Page]
compares BS 9251:2021 [Go to Page]
TRACKED CHANGES
Text example 1 — indicates added text (in green)
30403872-WEB.pdf [Go to Page]
Foreword
0 Introduction
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
Figure 1 — Height of top storey in building
4 Preliminary work and consultation [Go to Page]
4.1 Initial considerations
4.2 Consultation
4.3 Category of system
Table 1 — Category of system
5 Design [Go to Page]
5.1 General
5.2 System type
5.3 Design density and duration of supply
Table 2 — Minimum design parameters
5.4 Extent of sprinkler protection
5.5 Classification of residential and non-residential occupancies
Table 3 — Examples of classification of areas and design criteria for areas protected with “Residential” BS EN 12259‑14 sprinkler heads
5.6 Ordinary hazard protected areas
Table 4 — Examples of classification of areas and design criteria for areas to be protected with BS EN 12259‑1 sprinkler heads
5.7 Sprinkler coverage and positioning
Figure 2 — Two examples of shadow areas (plan views)
Figure 3 — Bay windows and similar features
5.8 Ceiling pockets
5.9 Residential pattern sprinkler heads
5.10 Hydraulic calculations
5.11 Water supplies
Figure 4 — Stored water supply
Figure 5 — Examples of water volumes for various shared water supplies
Figure 6 — Typical shared pump and water supply with PDV
5.12 Pumps
Figure 7 — Typical power supply arrangement to sprinkler pump and ancillary equipment
Figure 8 — Enhanced water supply
Figure 9 — Examples of primary and secondary power supply configurations
5.13 Pipes and fittings
5.14 Flexible sprinkler connection
5.15 Valves
5.16 Pressure reducing valves
5.17 Frost protection
5.18 Sprinkler system fire and fault alarm functionality
Table 5 — Fault conditions to be monitored in category 2, 3 and 4 systems
6 Installation, commissioning and documentation [Go to Page]
6.1 Installation
6.2 Commissioning
6.3 Documentation
6.4 Block plan
6.5 System data label
6.6 Location plate
Figure 10 — Example of a location plate
7 Maintenance [Go to Page]
7.1 Inspecting and testing routines
7.2 Reinstatement of the system
7.3 Log book
Annex A (informative) Elements of a typical residential sprinkler system [Go to Page]
Figure A.1 — Elements of a typical mains‑fed sprinkler system
Figure A.2 — Elements of a typical pump and tank sprinkler system
Figure A.3 — Typical arrangement of a multi-storey building with shared water supply and shared riser
Figure A.4 — Typical arrangement of a multi-storey building with shared water supply and dedicated sprinkler riser
Annex B (normative) Hydraulic calculations [Go to Page]
Table B.1 — C values for various type of pipes
Table B.2 — K values for carbon steel tube conforming to BS EN 10255, Medium series
Table B.3 — K values for CPVC conforming to ASTM F442
Table B.4 — K values for copper tube conforming to BS EN 1057:2006+A1, half‑hard, R250 designation
Table B.5 — Typical equivalent lengths for steel fittings and valves
Table B.6 — Typical equivalent lengths for CPVC fittings and valves
Table B.7 — Typical equivalent lengths for copper fittings and valves
Figure B.1 — Example of a square law graduation graph
Figure B.2 — Blank template of a square law graduation graph
Figure B.3 — Example sprinkler head layout scheme
Table B.8 — Example data extracted from a typical sprinkler head manufacturers datasheet
Table B.9 — Re-calculated parameters for BS 9251 application providing a minimum of 2.1 mm/min as required for BS 9251 category 1
Table B.10 — Worked example: actual coverage areas
Annex C (informative) Example of system data label [Go to Page]
Figure C.1 — System data label
Annex D (normative) Pipework support [Go to Page]
Table D.1 — Maximum spacing of fixings for copper and stainless steel pipework
Table D.2 — Maximum spacing of fixings for steel pipework
Table D.3 — Maximum spacing of fixings for CPVC pipework
Annex E (informative) Hydraulic test [Go to Page]
Figure E.1 — Test rig for hydraulic test
Annex F (normative) Long-term inspection and testing of pipework and sprinklers [Go to Page]
Table F.1 — Number of sprinklers to be removed and tested
Bibliography [Go to Page]

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