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Sprinkler Protection of Wooden Stairwells

Fire brigade. Sprinkler Protection of Wooden Stairwells. Henrik Bygbjerg, M.Sc., hby@dbi-net.dk Head of Research and Development at DBI 7th International Fire Sprinkler Conference 24-25 June 2008 in Copenhagen. Sprinkler Protection of Wooden Stairwells.

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Sprinkler Protection of Wooden Stairwells

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  1. Fire brigade Sprinkler Protection of Wooden Stairwells Henrik Bygbjerg, M.Sc., hby@dbi-net.dk Head of Research and Development at DBI 7th International Fire Sprinkler Conference 24-25 June 2008 in Copenhagen

  2. Sprinkler Protection of Wooden Stairwells • When renovation of old buildings 3 methods exists • Replacement of wooden stairwell with stairwell class R 30 A2-s1,d0 [BS-building element 30] i.e. steel or concrete stairwell • Protection of wooden stairwell with covering class K2 30 A2-s1,d0 [30 minutes Fire protection system] i.e. 15 mm fire gypsum board • Sprinkler protection of stair case

  3. Danish sprinkler regulation - historic • Sprinkler protection of wooden stairwell was allowed in buildings with up to 4 stories • Water amount calculated for release of all the sprinklers in the staircase • Alarm to the fire brigade by usage of Pressostat • Valves at building supply is to be installed

  4. Test programe • Laboratory test conducted in DBI laboratory • Staircase with 2.5 stories • Full scale test conducted in an existing building with 5 stories located in Copenhagen • Both test series was carried out for 4 different tests consisting of 2 fires in 2 boundary conditions: • Arson fire (fire in a child carrier) • Standard fire (wood crib) • Doors and windows to the staircase closed • Front door and top window to the staircase open

  5. Existing building for test in Copenhagen • 5 stories height • 6 sprinklers • 15 thermo couples • 2 pressure gates

  6. Standard fire (wood crib) – door and window open • Video

  7. Arson fire (child carrier) – door and window open • See the Video at: http://dbi-net.dk/Default.asp?Id=2768

  8. Results • The sprinkler system controlled all of the 4 fires • The sprinkler system extinguished 3 of the fires • Not all sprinklers in the staircase released • DBI retningslinie 251 chapter 1100 revised

  9. Results - temperatures

  10. Results - temperatures

  11. Future • Sprinkling of wooden staircase allowed in building with top floor level < 22.0 m over ground level • Release of 4 sprinkler should be used for water supply • Flow switch for transmitting alarm to the fire brigade • Valves at building supply shall not be installed

  12. Further information • Report (in danish) and video on DBI’s web page: www.en.dbi-net.dk • The test were conducted in coordination with www.social.dk www.nova5.dk www.dominia.dk www.kuben.dk www.bns.dk

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