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BS 9251:2021 – TC

BS 9251:2021 – TC

$280.87

Tracked Changes. Fire sprinkler systems for domestic and residential occupancies. Code of practice

Published By Publication Date Number of Pages
BSI 2021 170
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PDF Pages PDF Title
1 compares BS 9251:2021
2 TRACKED CHANGES
Text example 1 ā€” indicates added text (in green)
5 Summary of pages
6 Foreword
Publishing information
Supersession
Relationship with other publications
Information about this document
7 Use of this document
8 Presentational conventions
Contractual and legal considerations
Compliance with a British Standard cannot confer immunity from legal obligations.
Compliance with a British Standard cannot confer immunity from legal obligations.
9 1 Scope
10 2 Normative references
Standards references
11 Other references
3 Terms and definitions
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
12 3.8 building height
3.9 client
3.10 compartment
13 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
14 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
15 4 Preliminary work and consultation
4.1 Initial considerations
4.2 Consultation
18 4.2.4 Resilience of system
19 4.3 Category of system
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
20 4.5 Special circumstances
21 4.3 Category of system
22 5 Design
5.1 General
5.2 System type
5.3 Design density and duration of supply
5.3.1 General
24 5.3.2 Minimum design parameters
5.3.3 System flow rate
5.4 Extent of sprinkler protection
25 5.5 Sprinkler coverage and positioning
26 5.5 Classification of residential and non-residential occupancies
27 5.6 Residential pattern sprinkler heads
5.6.1 General
28 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
30 5.7 Hydraulic calculations
5.7 Sprinkler coverage and positioning
5.7.1 General
31 5.7.2 Permitted obstruction to residential sprinklers
32 5.8 Water supplies
5.8.1 General
5.8.2 Types of supply
33 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
34 5.8.4.2 Stored water capacity
Figure 1 Stored water supply
35 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
36 5.8 Ceiling pockets
5.9 Pumps
5.9.1 General
37 5.9.2 Combined sprinkler and domestic supply pump
5.9.3 Dedicated sprinkler pump
5.9 Residential pattern sprinkler heads
5.9.1 General
5.9.2 Minimum operating pressure and flow
5.9.3 Temperature rating of sprinklers
5.9.4 Sprinkler connection
38 5.10 Pipes and fittings
5.10 Hydraulic calculations
5.11 Valves
39 5.11 Water supplies
5.11.1 General
5.11.2 Types of supply
5.11.3 Mains water supply
5.11.3.1 General
40 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
41 5.11.4.3 Dedicated stored water supply
5.11.4.4 Shared stored water supply
44 5.11.4.5 Reduced capacity of stored water supply
5.11.5 Backflow prevention
45 5.12 Frost protection
5.12 Pumps
5.12.1 General
46 5.12.2 Electrical supply
47 5.12.3 Combined sprinkler and domestic supply pump
5.12.4 Dedicated sprinkler pump
48 5.12.5 Enhanced water supply
5.12.5.1 General
5.12.5.2 Option 1
5.12.5.3 Option 2
50 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…
51 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
53 5.14 Flexible sprinkler connection
5.15 Valves
54 5.16 Pressure reducing valves
5.17 Frost protection
5.18 Sprinkler system fire and fault alarm functionality
55 5.18.1 General
5.18.2 Fault alarms
56 5.18.3 Sprinkler fire alarms
5.18.3.1 All buildings
57 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
6.1 Installation
6.1.1 General
6.1.2 Pipework
6.1.2.1 General
58 6.1.2.2 Pipework support
6.1.2.3 Pipework through structural timbers
6.1.2.3 Pipework through construction elements
59 6.1.3 Sprinkler heads
6.2 Commissioning
6.2.1 General
6.2.2 Leakage test
6.2.3 Hydraulic test
6.2.4 Alarm test
6.2.5 Compliance certificate
60 6.2 Commissioning
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
61 6.2.6 Compliance certificate
6.3 Documentation
6.3.1 Presentation
6.3.2 Log book
6.3.3 Documents
62 6.3.3 Operation and maintenance (O&M) manual
63 6.4 System data label
6.4 Block plan
6.5 System data label
6.6 Location plate
64 7 Maintenance
7.1 Inspecting and testing
65 7.1.1 General
7.1.2 Yearly routine
66 7.1.3 Long-term inspection and testing
67 Annex A (informative)
73 Annex B (normative)
Hydraulic calculations
B.1 Static pressure
B.2 Flow from a sprinkler head
B.3 Pipe friction loss
75 B.5 Pressure loss through fittings and valves
76 B.6 Maximum flow demand calculation
78 B.7 Sprinkler head layout and hydraulic design process
79 EXAMPLE
82 Annex C (normative)
Hydraulic calculations
C.1 Static pressure
CC.2 Flow from a sprinkler head
C.3 Pipe friction loss
83 C.4 Pressure loss through fittings and valves
Table C.2a K values for carbon steel tube conforming to BS EN 10255, Medium series
84 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
85 Table C.3b Typical equivalent lengths for CPVC fittings and valves
Table C.3c Typical equivalent lengths for copper fittings and valves
86 C.5 Maximum flow demand calculation
88 Annex F C (informative)
Example of system data label
89 Annex D (normative)
Pipework support
90 Annex E (informative)
Hydraulic test
93 Annex F (normative)
94 Bibliography
Standards publications
Other publications
101 Foreword
105 0 Introduction
1 Scope
106 2 Normative references
107 3 Terms and definitions
108 Figure 1 ā€” Height of top storey in building
111 4 Preliminary work and consultation
4.1 Initial considerations
4.2 Consultation
114 4.3 Category of system
115 Table 1 ā€” Category of system
5 Design
5.1 General
116 5.2 System type
5.3 Design density and duration of supply
117 Table 2 ā€” Minimum design parameters
118 5.4 Extent of sprinkler protection
5.5 Classification of residential and non-residential occupancies
119 Table 3 ā€” Examples of classification of areas and design criteria for areas protected with ā€œResidentialā€ BS EN 12259ā€‘14 sprinkler heads
120 5.6 Ordinary hazard protected areas
121 Table 4 ā€” Examples of classification of areas and design criteria for areas to be protected with BS EN 12259ā€‘1 sprinkler heads
5.7 Sprinkler coverage and positioning
123 Figure 2 ā€” Two examples of shadow areas (plan views)
Figure 3 ā€” Bay windows and similar features
124 5.8 Ceiling pockets
5.9 Residential pattern sprinkler heads
125 5.10 Hydraulic calculations
5.11 Water supplies
128 Figure 4 ā€” Stored water supply
130 Figure 5 ā€” Examples of water volumes for various shared water supplies
131 Figure 6 ā€” Typical shared pump and water supply with PDV
132 5.12 Pumps
133 Figure 7 ā€” Typical power supply arrangement to sprinkler pump and ancillary equipment
136 Figure 8 ā€” Enhanced water supply
137 Figure 9 ā€” Examples of primary and secondary power supply configurations
5.13 Pipes and fittings
138 5.14 Flexible sprinkler connection
139 5.15 Valves
5.16 Pressure reducing valves
140 5.17 Frost protection
5.18 Sprinkler system fire and fault alarm functionality
142 Table 5 ā€” Fault conditions to be monitored in category 2, 3 and 4 systems
143 6 Installation, commissioning and documentation
6.1 Installation
145 6.2 Commissioning
146 6.3 Documentation
147 6.4 Block plan
6.5 System data label
6.6 Location plate
148 Figure 10 ā€” Example of a location plate
7 Maintenance
7.1 Inspecting and testing routines
149 7.2 Reinstatement of the system
7.3 Log book
150 Annex A (informative)ā€‚ Elements of a typical residential sprinkler system
Figure A.1 ā€” Elements of a typical mainsā€‘fed sprinkler system
151 Figure A.2 ā€” Elements of a typical pump and tank sprinkler system
152 Figure A.3 ā€” Typical arrangement of a multi-storey building with shared water supply and shared riser
153 Figure A.4 ā€” Typical arrangement of a multi-storey building with shared water supply and dedicated sprinkler riser
154 Annex B (normative)ā€‚ Hydraulic calculations
155 Table B.1 ā€” C values for various type of pipes
Table B.2 ā€” K values for carbon steel tube conforming to BS EN 10255, Medium series
Table B.3 ā€” K values for CPVC conforming to ASTM F442
Table B.4 ā€” K values for copper tube conforming to BS EN 1057:2006+A1, halfā€‘hard, R250 designation
156 Table B.5 ā€” Typical equivalent lengths for steel fittings and valves
157 Table B.6 ā€” Typical equivalent lengths for CPVC fittings and valves
Table B.7 ā€” Typical equivalent lengths for copper fittings and valves
158 Figure B.1 ā€” Example of a square law graduation graph
159 Figure B.2 ā€” Blank template of a square law graduation graph
160 Figure B.3 ā€” Example sprinkler head layout scheme
161 Table B.8 ā€” Example data extracted from a typical sprinkler head manufacturers datasheet
Table B.9 ā€” Re-calculated parameters for BS 9251 application providing a minimum of 2.1 mm/min as required for BS 9251 category 1
162 Table B.10 ā€” Worked example: actual coverage areas
163 Annex C (informative)ā€‚ Example of system data label
Figure C.1 ā€” System data label
164 Annex D (normative)ā€‚ Pipework support
Table D.1 ā€” Maximum spacing of fixings for copper and stainless steel pipework
Table D.2 ā€” Maximum spacing of fixings for steel pipework
Table D.3 ā€” Maximum spacing of fixings for CPVC pipework
165 Annex E (informative)ā€‚ Hydraulic test
166 Figure E.1 ā€” Test rig for hydraulic test
Annex F (normative)ā€‚ Long-term inspection and testing of pipework and sprinklers
167 Table F.1 ā€” Number of sprinklers to be removed and tested
168 Bibliography

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BS 9251:2021 - TC
$280.87