Alie Street, London

The Brief

To design, supply, install and commission a sprinkler system to a refurbished 8 storey office block, including water supplies and a new dry riser system.

The challenge

Issue with drainage in the pump room as there was no drainage within the basement. The main contractor supplied and installed a waste tank with sump pumps to remove water into the drainage system located at high level in the basement.

The Solution

FDS installed a pre-calculated OH 1 system with 520 sprinkler heads inclusive of water supplies to LPC rules BSEN12845:2015. Equipment used 27.5m3 GRP rectangular sectional tank feeding 1 duty electric pump via 1 no 80mm wet alarm valve all situated within the basement sprinkler pump room. Each floor was fed via its own flow switch and isolating valve. Each monitored back at the main fire alarm panel.

The dry riser system ran in its own dedicated riser with landing valves located on each floor.