Släcksystem på ubåtar - inom elkabinett
(2025) In LUTVDG/TVBB VBRM01 20251Division of Fire Safety Engineering
- Abstract
- This report is written to support SAAB Kockums AB in their investigations of whether it is necessary to replace their current Novec 1230 fire extinguishing system in electrical cabinets due to environmental restrictions, and what type of agent that would be a suitable replacement. The work focuses on determining consequences of a fire in an electrical cabinet regarding different aspects such as: fire spread from a cabinet, fire spread inside a cabinet, expected heat release rate, smoke spread outside a cabinet and temperature effects on electrical components. This is done through studying publicly available fire experiments and descriptions of the electrical cabinet design onboard SAAB Kockums AB submarines regarding fire dynamics. The... (More)
- This report is written to support SAAB Kockums AB in their investigations of whether it is necessary to replace their current Novec 1230 fire extinguishing system in electrical cabinets due to environmental restrictions, and what type of agent that would be a suitable replacement. The work focuses on determining consequences of a fire in an electrical cabinet regarding different aspects such as: fire spread from a cabinet, fire spread inside a cabinet, expected heat release rate, smoke spread outside a cabinet and temperature effects on electrical components. This is done through studying publicly available fire experiments and descriptions of the electrical cabinet design onboard SAAB Kockums AB submarines regarding fire dynamics. The focus of the other parts of the report is a literature study of available and relevant extinguishing agents. These agents were researched regarding different parameters that were deemed important for the submarine environment. The study showed that fires in electrical cabinets are highly influenced by the ventilation conditions of the cabinet. Fires in the described cabinets are expected to remain local and self-extinguish without spread through the entire cabinet or to the outside. Temperatures can cause damage to sensitive components inside the fire cabinet, and smoke spread to a surrounding room can be quick even though the heat release rate is relatively low. Depending on the type of extinguishing agent different limitations will occur. Halogenated gases such as Novec 1230 are likely to be restricted in the future which makes them an inappropriate option. Inert gases and carbon dioxide a more agent (per weight), more area and volume for the gas cylinders and pressure release venting of the cabinets. They might also damage electronics during discharge due to high noise levels. With this in regard they might in some conditions be suitable. Pyrotechnically generated aerosols have good properties for weight and volume as well as extinguishing time. The limitation includes the toxicity aspect where conducted studies regarding some types of aerosols show hazardous conditions and clean up after a discharge. For the relatively small volumes cabinets the concentrations of hazardous products outside the cabinets and in the occupied space are likely to be lower which might make them a good option. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9187925
- author
- Östlund, Emil LU
- supervisor
- organization
- course
- VBRM01 20251
- year
- 2025
- type
- M2 - Bachelor Degree
- subject
- keywords
- Submarine, cabinet, electrical fires, fire extinguishing systems
- publication/series
- LUTVDG/TVBB
- report number
- 5738
- other publication id
- LUTVDG/TVBB--5738--SE
- language
- Swedish
- id
- 9187925
- date added to LUP
- 2025-04-30 10:14:30
- date last changed
- 2025-04-30 10:14:30
@misc{9187925,
abstract = {{This report is written to support SAAB Kockums AB in their investigations of whether it is necessary to replace their current Novec 1230 fire extinguishing system in electrical cabinets due to environmental restrictions, and what type of agent that would be a suitable replacement. The work focuses on determining consequences of a fire in an electrical cabinet regarding different aspects such as: fire spread from a cabinet, fire spread inside a cabinet, expected heat release rate, smoke spread outside a cabinet and temperature effects on electrical components. This is done through studying publicly available fire experiments and descriptions of the electrical cabinet design onboard SAAB Kockums AB submarines regarding fire dynamics. The focus of the other parts of the report is a literature study of available and relevant extinguishing agents. These agents were researched regarding different parameters that were deemed important for the submarine environment. The study showed that fires in electrical cabinets are highly influenced by the ventilation conditions of the cabinet. Fires in the described cabinets are expected to remain local and self-extinguish without spread through the entire cabinet or to the outside. Temperatures can cause damage to sensitive components inside the fire cabinet, and smoke spread to a surrounding room can be quick even though the heat release rate is relatively low. Depending on the type of extinguishing agent different limitations will occur. Halogenated gases such as Novec 1230 are likely to be restricted in the future which makes them an inappropriate option. Inert gases and carbon dioxide a more agent (per weight), more area and volume for the gas cylinders and pressure release venting of the cabinets. They might also damage electronics during discharge due to high noise levels. With this in regard they might in some conditions be suitable. Pyrotechnically generated aerosols have good properties for weight and volume as well as extinguishing time. The limitation includes the toxicity aspect where conducted studies regarding some types of aerosols show hazardous conditions and clean up after a discharge. For the relatively small volumes cabinets the concentrations of hazardous products outside the cabinets and in the occupied space are likely to be lower which might make them a good option.}},
author = {{Östlund, Emil}},
language = {{swe}},
note = {{Student Paper}},
series = {{LUTVDG/TVBB}},
title = {{Släcksystem på ubåtar - inom elkabinett}},
year = {{2025}},
}