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BS EN 12845-3:2024

BS EN 12845-3:2024

$167.15

Fixed firefighting systems. Automatic sprinkler systems – Guidance for earthquake bracing

Published By Publication Date Number of Pages
BSI 2024 42
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This document specifies requirements for earthquake protection of automatic sprinkler systems in accordance with EN 12845:2015+A1:2019. This document applies only to locations in earthquake zones in accordance with EN 1998-1:2004, 3.2.1 and the Nationally Determined Parameters. NOTE The requirements in this document are based on the principle that certain peak ground acceleration values are considered as an earthquake which require special means. Attention is drawn to EN 1998-1:2004, where a peak ground acceleration above 0,08 g (0,78 m/s2) is considered an earthquake risk. Additional characteristics, NDP and/or NCI can exist in some countries as well as national annexes. The principles defined in this document can be applicable to other water based fixed manual or automatic fire fighting systems, according to local requirements.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms and definitions
9 4 Design principles
5 Sway bracing and sprinkler pipe support
5.1 General
10 5.2 Sway brace design
5.2.1 Steps in designing sway brace
11 5.2.2 Step 1, define sway bracing locations
5.2.2.1 Risers
13 5.2.2.2 Horizontal changes of direction
5.2.2.3 Ends of main distribution pipes and distribution pipes
5.2.2.4 Unnecessary flexible couplings
5.2.2.5 Horizontal and sloped straight pipes
15 5.2.3 Step 2, calculate seismic design load for each sway bracing location
5.2.3.1 General
5.2.3.2 Eurocode method in accordance with EN 19981:20041
16 5.2.3.3 Simplified method
17 5.2.3.4 Calculation of design load for four-way sway bracing at risers
5.2.3.5 Calculation of design load for lateral two-way sway bracing
5.2.3.6 Calculation of design load for longitudinal two-way sway bracing
24 5.2.4 Step 3, select the proper sway bracing shape, size and maximum length
5.2.4.1 General
5.2.4.2 For using one diagonal brace and one vertical
25 5.2.4.3 For using two opposing rigid diagonal braces
26 5.2.4.4 For tension only sway bracing
27 5.2.4.5 For the case where the piping is supported firmly against the underside of a structural member
5.2.5 Step 4, select the proper method to attach the sway bracing to the structure and to the piping
5.2.5.1 General
5.2.5.2 Structural members
5.2.5.3 Fasteners
29 5.2.5.4 Attachment to sprinkler piping
34 6 Flexibility
6.1 General
6.2 Flexible couplings
6.2.1 General
6.2.2 Risers and standpipes
35 6.2.3 Horizontal main distribution pipes and distribution pipes
6.2.4 Drops
36 6.3 Seismic separation assemblies
39 7 Clearance
7.1 Clearance around piping through walls or floors
7.2 Clearance at sprinklers
8 Other provisions
8.1 Bracing of suspended ceilings
8.2 Water supply
8.3 Storage racks with in-rack sprinklers

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BS EN 12845-3:2024
$167.15