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Brandteknisk riskvärdering av Torpa Stenhus

Jansson, Nicklas LU ; Wikensten, Anton LU ; Malmeström, Anna LU and Sutinen, Alexandra LU (2013) VBR054 20131
Division of Fire Safety Engineering
Division of Risk Management and Societal Safety
Abstract
A risk evaluation with regards to fire safety has been performed at Torpa Stenhus. The focus of the evaluation was the safety of the people inside the building in case of a fire. As part of the education for future fire protection engineers at LTH a risk evaluation report is performed in the course Brandteknisk riskvärdering (VBR054).
Torpa Stenhus was built during the 15th century and is located in the vicinity of Borås by the lake Åsunden. Torpa Stenhus is one of the best preserved castles in Sweden. The building is open for the general public but it is also used for other events such as weddings, parties and conferences. The two main halls have a capacity of 100 and 110 persons each.
Torpa Stenhus has only got one door leading... (More)
A risk evaluation with regards to fire safety has been performed at Torpa Stenhus. The focus of the evaluation was the safety of the people inside the building in case of a fire. As part of the education for future fire protection engineers at LTH a risk evaluation report is performed in the course Brandteknisk riskvärdering (VBR054).
Torpa Stenhus was built during the 15th century and is located in the vicinity of Borås by the lake Åsunden. Torpa Stenhus is one of the best preserved castles in Sweden. The building is open for the general public but it is also used for other events such as weddings, parties and conferences. The two main halls have a capacity of 100 and 110 persons each.
Torpa Stenhus has only got one door leading outside. The five floors of Torpa Stenhus are linked by a common stairwell. The existing systems with regards to fire safety consist of optical smoke detectors and handheld fire-extinguishers spread across the five floors.
The project was initiated by an onsite visit where the students, accompanied by mentors from both the Södra Älvsborgs fire department and LTH, met the owner and operator Pehr Zethelius. During the onsite visit focus was directed towards identifying all plausible fire scenarios and noting the physical measurements of the building.
Objectives for an adequate level of protection and the highest acceptable levels of exposure in case of a fire were defined in light of the report’s focus. The objectives were that none of the persons evacuating the building should be exposed to these highest acceptable levels.
A coarse analysis of all plausible scenarios gave the most hazardous fire scenarios. This analysis was made by comparing statistics from similar buildings and via subjective assessments where the probability and consequence was transformed into a risk. Using an event tree, different scenarios based on what sort of evacuation that took place were obtained.
Using computer programs, namely FDS, Simulex and DETACT T2 different evacuation and fire scenarios were simulated. The different simulations combined with reasoning supported by experimental data led to that both the total evacuation time and the time until the highest acceptable exposure levels was exceeded, were obtained. By comparing these two times in an event tree for every scenario the conclusion was made that at present day Torpa Stenhus does not fulfill the objectives for and adequate level of protection in case of a fire.
To reach an adequate level of protection in case of a fire the following measures should be adopted:
- Accommodate safe evacuation through the stairwell
- Install sealed doors
- Install automatic door closers to the chapel
- Improve the possibilities of navigations in the building
- Replace the existing evacuation signs to backlit evacuation signs
- Install backlit evacuation signs for the new evacuation route
- Measures for systematic fire prevention
- Staffeducation
- Inspections
- Responsibility areas for the staff
- Install a detector in the Staffroom
- Reduce the risk of fire in the Staffroom
- Reduce the amount of combustible material
- Install a timer on electrical outlets
- Install spoken message as an evacuation alarm
- Reopena evacuation route
- Install exit devices
- Provide evacuation route with emergency lightning and railings

To further improve the level of protection in case of a fire the following measures may be taken:
- Request a response plan from the Rescue Service
- Install a lightning rod
- Reduce the use of candles
- Flameproof furnishing and interiors
- Change the detectors error message
- Install automatic fire alarm
- Install manual buttons to alarm rescue services
- Regularly inspect the electrical equipment and cabling
- Lower the maximum allowed capacity of the two main halls (Less)
Please use this url to cite or link to this publication:
author
Jansson, Nicklas LU ; Wikensten, Anton LU ; Malmeström, Anna LU and Sutinen, Alexandra LU
supervisor
organization
course
VBR054 20131
year
type
L3 - Miscellaneous, Projetcs etc.
subject
keywords
Kulturminne, CFD, FDS, Pyrosim, stenhus, brandscenario, utrymning, utrymningssimulering, Simulex, effektutvecklingskurva, brandsimulering Torpa Stenhus, grovanalys, analytiska metoder, kritiska förhållanden, DETACT T2, personsäkerhet
report number
9440
language
Swedish
id
3802027
date added to LUP
2013-06-05 08:50:09
date last changed
2014-03-10 10:40:45
@misc{3802027,
  abstract     = {A risk evaluation with regards to fire safety has been performed at Torpa Stenhus. The focus of the evaluation was the safety of the people inside the building in case of a fire. As part of the education for future fire protection engineers at LTH a risk evaluation report is performed in the course Brandteknisk riskvärdering (VBR054).
Torpa Stenhus was built during the 15th century and is located in the vicinity of Borås by the lake Åsunden. Torpa Stenhus is one of the best preserved castles in Sweden. The building is open for the general public but it is also used for other events such as weddings, parties and conferences. The two main halls have a capacity of 100 and 110 persons each.
Torpa Stenhus has only got one door leading outside. The five floors of Torpa Stenhus are linked by a common stairwell. The existing systems with regards to fire safety consist of optical smoke detectors and handheld fire-extinguishers spread across the five floors.
The project was initiated by an onsite visit where the students, accompanied by mentors from both the Södra Älvsborgs fire department and LTH, met the owner and operator Pehr Zethelius. During the onsite visit focus was directed towards identifying all plausible fire scenarios and noting the physical measurements of the building.
Objectives for an adequate level of protection and the highest acceptable levels of exposure in case of a fire were defined in light of the report’s focus. The objectives were that none of the persons evacuating the building should be exposed to these highest acceptable levels.
A coarse analysis of all plausible scenarios gave the most hazardous fire scenarios. This analysis was made by comparing statistics from similar buildings and via subjective assessments where the probability and consequence was transformed into a risk. Using an event tree, different scenarios based on what sort of evacuation that took place were obtained.
Using computer programs, namely FDS, Simulex and DETACT T2 different evacuation and fire scenarios were simulated. The different simulations combined with reasoning supported by experimental data led to that both the total evacuation time and the time until the highest acceptable exposure levels was exceeded, were obtained. By comparing these two times in an event tree for every scenario the conclusion was made that at present day Torpa Stenhus does not fulfill the objectives for and adequate level of protection in case of a fire.
To reach an adequate level of protection in case of a fire the following measures should be adopted:
- Accommodate safe evacuation through the stairwell
- Install sealed doors
- Install automatic door closers to the chapel
- Improve the possibilities of navigations in the building
- Replace the existing evacuation signs to backlit evacuation signs
- Install backlit evacuation signs for the new evacuation route
- Measures for systematic fire prevention
- Staffeducation
- Inspections
- Responsibility areas for the staff
- Install a detector in the Staffroom
- Reduce the risk of fire in the Staffroom
- Reduce the amount of combustible material
- Install a timer on electrical outlets
- Install spoken message as an evacuation alarm
- Reopena evacuation route
- Install exit devices
- Provide evacuation route with emergency lightning and railings

To further improve the level of protection in case of a fire the following measures may be taken:
- Request a response plan from the Rescue Service
- Install a lightning rod
- Reduce the use of candles
- Flameproof furnishing and interiors
- Change the detectors error message
- Install automatic fire alarm
- Install manual buttons to alarm rescue services
- Regularly inspect the electrical equipment and cabling
- Lower the maximum allowed capacity of the two main halls},
  author       = {Jansson, Nicklas and Wikensten, Anton and Malmeström, Anna and Sutinen, Alexandra},
  keyword      = {Kulturminne,CFD,FDS,Pyrosim,stenhus,brandscenario,utrymning,utrymningssimulering,Simulex,effektutvecklingskurva,brandsimulering Torpa Stenhus,grovanalys,analytiska metoder,kritiska förhållanden,DETACT T2,personsäkerhet},
  language     = {swe},
  note         = {Student Paper},
  title        = {Brandteknisk riskvärdering av Torpa Stenhus},
  year         = {2013},
}