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Skärsläckaren - experimentella försök och beräkningar

Bjerregaard, Johannes and Olsson, Daniel (2007) In LUTVDG/TVBB – 5221 – SE
Division of Fire Safety Engineering
Fire Protection Engineering 3,5 years
Division of Risk Management and Societal Safety
Abstract
During the last decade the cutting extinguisher has been used as a complement to more traditional fire fighting tools in the Swedish rescue service. In earlier research regarding the cutting extinguisher, the
tools ability to penetrate different building materials and the transition of the water jet into a water spray inside the enclosure have been given little attention. This report aims to illustrate how different
elements of construction affect the performance of the cutting extinguisher in terms of: penetration time, brake-up of the water jet and extinction characteristics. The report is based on an empirical study
including 21 tests on different elements of construction. The results show that the penetration time varies... (More)
During the last decade the cutting extinguisher has been used as a complement to more traditional fire fighting tools in the Swedish rescue service. In earlier research regarding the cutting extinguisher, the
tools ability to penetrate different building materials and the transition of the water jet into a water spray inside the enclosure have been given little attention. This report aims to illustrate how different
elements of construction affect the performance of the cutting extinguisher in terms of: penetration time, brake-up of the water jet and extinction characteristics. The report is based on an empirical study
including 21 tests on different elements of construction. The results show that the penetration time varies considerably, from a few seconds to several minutes, for commonly used building materials. Furthermore the brake-up of the water jet appeared at approximately 5 metres from the nozzle in all tests, suggesting that the penetrated construction does not affect the transition of the water jet into a
water spray. Calculations indicate that the water content in the spray is, at the most, 50 % of that theoretically needed for extinction of diffusion flames through gaseous interaction. This suggests that
formation and confinement of water vapour might be of importance for flame extinction. Which gives reason to suspect that the cutting extinguisher may be limited in terms of flame extinction in wellventilated
constructions, if the fuel surface is not targeted directly. (Less)
Please use this url to cite or link to this publication:
author
Bjerregaard, Johannes and Olsson, Daniel
supervisor
organization
year
type
M2 - Bachelor Degree
subject
keywords
Skärsläckare, högtryck, brandbekämpning, vattendimma
publication/series
LUTVDG/TVBB – 5221 – SE
report number
5221
ISSN
1402-3504
language
Swedish
id
1767600
date added to LUP
2011-01-25 11:00:51
date last changed
2014-03-10 10:40:36
@misc{1767600,
  abstract     = {{During the last decade the cutting extinguisher has been used as a complement to more traditional fire fighting tools in the Swedish rescue service. In earlier research regarding the cutting extinguisher, the
tools ability to penetrate different building materials and the transition of the water jet into a water spray inside the enclosure have been given little attention. This report aims to illustrate how different
elements of construction affect the performance of the cutting extinguisher in terms of: penetration time, brake-up of the water jet and extinction characteristics. The report is based on an empirical study
including 21 tests on different elements of construction. The results show that the penetration time varies considerably, from a few seconds to several minutes, for commonly used building materials. Furthermore the brake-up of the water jet appeared at approximately 5 metres from the nozzle in all tests, suggesting that the penetrated construction does not affect the transition of the water jet into a
water spray. Calculations indicate that the water content in the spray is, at the most, 50 % of that theoretically needed for extinction of diffusion flames through gaseous interaction. This suggests that
formation and confinement of water vapour might be of importance for flame extinction. Which gives reason to suspect that the cutting extinguisher may be limited in terms of flame extinction in wellventilated
constructions, if the fuel surface is not targeted directly.}},
  author       = {{Bjerregaard, Johannes and Olsson, Daniel}},
  issn         = {{1402-3504}},
  language     = {{swe}},
  note         = {{Student Paper}},
  series       = {{LUTVDG/TVBB – 5221 – SE}},
  title        = {{Skärsläckaren - experimentella försök och beräkningar}},
  year         = {{2007}},
}