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BS 9251:2021

BS 9251:2021

$215.11

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

Published By Publication Date Number of Pages
BSI 2021 74
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This British Standard gives recommendations for the design, installation, components, water supplies and backflow protection, commissioning, maintenance and testing of fire sprinkler systems installed for life safety purposes in residential and domestic premises.

NOTE 1 Sprinkler systems also provide additional benefits for property protection and prevention of fire spread.

This British Standard is applicable for sprinkler protection of domestic and residential premises and contains specific recommendations for sprinkler systems in those premises of more than four storeys or 18 m in height.

NOTE 2 Unless otherwise specified, references to residential sprinkler system in this British Standard include domestic sprinkler systems.

The recommendations of this British Standard are also applicable to any addition, extension, repair or other modification to a residential sprinkler system.

PDF Catalog

PDF Pages PDF Title
5 Foreword
9 0 Introduction
1 Scope
10 2 Normative references
11 3 Terms and definitions
12 Figure 1 — Height of top storey in building
15 4 Preliminary work and consultation
4.1 Initial considerations
4.2 Consultation
18 4.3 Category of system
19 Table 1 — Category of system
5 Design
5.1 General
20 5.2 System type
5.3 Design density and duration of supply
21 Table 2 — Minimum design parameters
22 5.4 Extent of sprinkler protection
5.5 Classification of residential and non-residential occupancies
23 Table 3 — Examples of classification of areas and design criteria for areas protected with “Residential” BS EN 12259‑14 sprinkler heads
24 5.6 Ordinary hazard protected areas
25 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
27 Figure 2 — Two examples of shadow areas (plan views)
Figure 3 — Bay windows and similar features
28 5.8 Ceiling pockets
5.9 Residential pattern sprinkler heads
29 5.10 Hydraulic calculations
5.11 Water supplies
32 Figure 4 — Stored water supply
34 Figure 5 — Examples of water volumes for various shared water supplies
35 Figure 6 — Typical shared pump and water supply with PDV
36 5.12 Pumps
37 Figure 7 — Typical power supply arrangement to sprinkler pump and ancillary equipment
40 Figure 8 — Enhanced water supply
41 Figure 9 — Examples of primary and secondary power supply configurations
5.13 Pipes and fittings
42 5.14 Flexible sprinkler connection
43 5.15 Valves
5.16 Pressure reducing valves
44 5.17 Frost protection
5.18 Sprinkler system fire and fault alarm functionality
46 Table 5 — Fault conditions to be monitored in category 2, 3 and 4 systems
47 6 Installation, commissioning and documentation
6.1 Installation
49 6.2 Commissioning
50 6.3 Documentation
51 6.4 Block plan
6.5 System data label
6.6 Location plate
52 Figure 10 — Example of a location plate
7 Maintenance
7.1 Inspecting and testing routines
53 7.2 Reinstatement of the system
7.3 Log book
54 Annex A (informative)  Elements of a typical residential sprinkler system
Figure A.1 — Elements of a typical mains‑fed sprinkler system
55 Figure A.2 — Elements of a typical pump and tank sprinkler system
56 Figure A.3 — Typical arrangement of a multi-storey building with shared water supply and shared riser
57 Figure A.4 — Typical arrangement of a multi-storey building with shared water supply and dedicated sprinkler riser
58 Annex B (normative)  Hydraulic calculations
59 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
60 Table B.5 — Typical equivalent lengths for steel fittings and valves
61 Table B.6 — Typical equivalent lengths for CPVC fittings and valves
Table B.7 — Typical equivalent lengths for copper fittings and valves
62 Figure B.1 — Example of a square law graduation graph
63 Figure B.2 — Blank template of a square law graduation graph
64 Figure B.3 — Example sprinkler head layout scheme
65 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
66 Table B.10 — Worked example: actual coverage areas
67 Annex C (informative)  Example of system data label
Figure C.1 — System data label
68 Annex D (normative)  Pipework support
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
69 Annex E (informative)  Hydraulic test
70 Figure E.1 — Test rig for hydraulic test
Annex F (normative)  Long-term inspection and testing of pipework and sprinklers
71 Table F.1 — Number of sprinklers to be removed and tested
72 Bibliography

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BS 9251:2021
$215.11