BS9251

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    BS 9251:2014 - Regulation

    As dry riser and wet riser experts, we thought we would break this dowm.

    The British Standard details and recommends the design, components, water supplies, commissioning, testing and maintenance of domestic and residential fire sprinkler systems used for life safety purposes.

    BS9251 is the British Standard. This is the 2nd version of this standard, originally published in 2005 then reviewed and amended in 2014 with help from members of the fire service and players in the industry

    Category of System and key requirements

    Each type of occupancy has different requirements regarding the design, installation and the servicing of fire sprinkler systems. The types of properties covered vary on size and type of resident and therefore are split into risk categories. These categories range from 1-3.
    Category of System Description of building/occupancy
    1

    Single family dwellings such as: (A)

    • Individual dwelling house
    • Individual flat
    • Individual maisonette
    • Transportable home

    Houses of multiple occupation (HMOs) – (A) (B)

    Bed and breakfast accommodation (A) (B)

    Boarding houses (A) (B)

    Blocks of flats 18 m or less in height and with a maximum total floor area of 2 400 m2 (A) (C)
    2

    Blocks of flats greater than 18 m in height (D)

    Small residential care premises with ten residents or fewer

    Sheltered and extra care housing (D)
    3

    Residential care premises with more than ten residents

    Dormitories (e.g. attached to educational establishments)

    Hostels

    (A) If any of these buildings permanently house vulnerable people, this should be considered in determining the building category.

    (B) Buildings with more than two floors and five or more lettable bedrooms should be treated ad Cat 2.

    (C) Where fire strategy requires the communal rooms and corridors to be sprinkler protected, or where the total floor area is greater than 2 400 m2, then the building should be treated as Cat 2.

    (D) Where the fire strategy requires the communal rooms and corridors to be sprinkler protected, then the building should be treated as Cat 3.

    System Category 1 Category 2 Category 3
    Minimum flow rate
    60 Lpm
    130 Lpm
    240 Lpm
    Static Pressure
    3 bar
    4.5 bar
    6 bar
    Effective stored water
    1m3 – 1.5m3
    3m3 – 4.5m3
    6m3 – 9m3

    Accreditation

    Having shown compliance with current health and safety legislation – ‘Dry riser solutions’ is accredited within the Contractors Health and Safety Assessment Scheme (CHAS).

    All our projects are designed, installed and commissioned to industrial standard and legislation BS9990: 2015 Standards. All the parts used in designing are BS5041 standards

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