The Old Portsmouth GAOL

The Old Portsmouth GAOL

Project Information
  • Location
  • Portsmouth
  • Sector
  • Housing, Private Development
  • Services
  • Buildings, Compliance, Fire Engineering, Building Services Engineering, Assigned Certifier
  • Architect
  • Feildon Clegg Bradley

This project comprises the restoration, conversion and redevelopment of the disused Victorian Kingston Prison in Portsmouth. In total the scheme will create 230 homes; a mixture of apartments within the listed wings of the old prison and in sensitively designed new build blocks around the site. The main historic buildings which include wings A, B, C, D and E have expansive main atriums that extend to 30m.

The main apartment building which includes wings A, B, C, D and E will be provided with an atrium and extended travel distances (>30m). Therefore, under the standard guidance the layout would require all apartments to be installed with an automatic suppression system. MLM Fire Engineering proposed to enhance the smoke control system present within the wings to allow for increased tenability conditions, as a compensatory feature for omitting sprinklers in the atrium apartments.

Value fire engineering included:

  • Omit the installation of an automatic sprinkler system in each Wings apartments.
  • Extended travel distances in the common corridors.
  • The recommended hose coverage for a non-sprinkler protected building is 45m. The hose laying distance in some of the blocks is 60m and exceeds the recommended limit of 45m. It was demonstrated that the fire safety compensatory measures provided is equivalent or better than a sprinkler protected building.
  • BS 9990 recommends dry riser inlet point should be positioned at the front of the façade and visible for the fire rescue service. It is proposed to install the dry riser inlet box in the entrance lobby in Wing E. This is considered reasonable due to the provision of alternative entrance for fire brigade.
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