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Experts in the design, supply, installation and commissioning of Dry and Wet Risers

Dry Riser

A dry riser is a normally empty pipe that can be externally connected by firefighters to a pressurised water source. It is a vertical pipe intended to distribute water to multiple levels of a building or structure as a component of the fire suppression systems.

A Landing Valve should be provided at each floor level, including the ground floor level, where personnel can connect and fill hose lines in relative safety before entering the fire compartment. 

Inlet Connections for a fire main should be installed in an external wall or in a boundary wall of a building as close as possible to the position of the main which they serve, ideally on the exterior face of the fire fighting shaft and adjacent to the access point. Any run of connecting pipe between the inlet and the vertical run of the main should be kept to a minimum and should be given a fall towards the drain valve. For typical building applications, the run of horizontal connecting pipe is a maximum of 18M in length. 

Isolating Valves should be incorporated in the system at intervals not exceeding 10m on vertical pipework so that sections of the fire main can be isolated to enable repairs to be carried out. 


Building with a top storey over 50M from firefighter access level? Find information on wet risers. 


Protection of Buildings under construction

In order that a fire occurring during the construction of a building can be dealt with effectively, especially in high or extensive buildings where large quantities of combustible materials might be stored, mains should be in an operational condition as soon as any floor of the building reaches 11m above fire service access level. These mains should be extended and commissioned progressively as work on the building proceeds to provide fire-fighting facilities at all stages of construction. 

Maintenance Requirements

Inlets, landing valves, drain valves, door hinges and locking arrangements to the inlet and landing valve boxes should be inspected every six months.

Additionally, on an annual basis, a Static Pressure Test should be conducted in accordance with section of BS9990:2015. 

The services of a competent person should be obtained to carry out maintenance and repairs. 

Contact React 4 Group to discuss your project or maintenance requirements. 

Six Monthly Inspections 

Annual Static Pressure Test

Competent Contractor

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