Dry and Wet Risers in UK Buildings: Requirements and Testing

Risers provide essential water supply for firefighting in multi-storey buildings. We explain when they're required and how they must be maintained.. Risers in UK Buildings When Required Dry riser — buildings with a floor over 18m above ground (ADB B5) Wet riser — buildings with a floor over 50m above ground Dry Risers Charged by fire service pumping appliance at ground level Outlet on each floor in firefighting lobby Maximum hose distance of 60m from outlet Testing — 6 monthly visual inspection, annual wet test Wet Risers Permanently charged with water from tank and pump Minimum pressure at highest outlet: 8 bar Minimum flow: 1500 litres/minute at highest two outlets Testing — weekly pump run, 6 monthly flow test, annual full test For riser design and testing, contact us.