BS9990
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Dry Riser Regulations BS9990
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BS9990:2015 Hydrants
and Testing
Looking for BS9990 hydrant testing? BS9990:2015 is the British Standard that regulates the design, installation, testing, and maintenance of dry risers and non-automatic fire-fighting systems in UK buildings.
The standard provides guidance for building owners, outlining best practices for the installation, full commissioning, and ongoing testing of fire-fighting systems, including both wet and dry fire-fighting mains.
We deliver BS9990-compliant inspections, flow tests, and maintenance services to ensure your system remains safe, functional, and fully compliant.
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BS9990:2015
Here is more detailed information on the BS9990:2015 standards for fire fighting systems, in particular, this regulation focuses on Dry Riser installations.
It states that;
- When fitting a dry fire main, provide a two-way breeching for 100 mm mains. Each breeching should conform to BS5041-3. Locate each breeching in a dry riser inlet box conforming to BS5041-5 with the enclosure measuring between 400 mm and 600 mm above the ground.
- Horizontal (floor-mounted) inlets are not suitable for most fire main applications.
- The operating pressure of dry fire mains should be up to 12 bar.
- Fit all drain valves inlet breeching with a 25 mm drain valves, conforming to BS5041-3.
- Install an air release valve at the top of all vertical mains to allow for venting of air from the mains.
- Install a landing valve with its lowest point measuring about 750 mm above the ground.
- Provide a landing valve at each floor level, including the landing floor level.
- Install and protect landing valves for fire mains within a box per BS5041-4.
- Install inlet connections for fire main in an external wall or in a boundary wall of a building near the mains they serve, ideally on the exterior face of the fire-fighting shaft and adjacent to the access point.
- Landing valves for dry mains should conform to BS 5041-2. Outlets should be directly threaded. Instead, they should be flanged to allow for easy maintenance.
BS9990 Fire Hydrant Testing
- For typical building applications, the run of horizontal connecting pipe should have a maximum length of 18 m.
- Where the fire-fighting shaft or fire-fighting stair is not adjacent to a perimeter wall, there should be an assessment to determine if more than one inlet should be provided.
- If two or more inlets are provided, they should be located sufficiently far apart to offer viable alternative locations for charging the fire main.
- If more than one fire main dry riser inlet is needed for installation, it should be approved by the authorities and local fire service providers.
- In selecting positions for inlet connections, take note of the positions of fire hydrants, the parking locations for fire appliances, and the effect that falling debris and other possible occurrences during a fire might have on the continuing viability of the location (see BS9991 and BS9999).
- Inlets should be flanged rather than directly threaded to allow for easy maintenance.
- The number and disposition of rising/falling mains should conform with BS9991 or BS9999 as appropriate. For large buildings or sites comprising multiple buildings, do not serve horizontal or vertical fire central pipework from the same inlet connection.
- Fire mains should be electrically earthed in conformity with BS7671 and BS7430. The joints which do not provide electrical continuity should be bonded.
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