Fire and Gas protection system
Fire and Gas protection system
During designing of "Fire and Gas Protection system”, how we calculate the water spread which should be required for the effected area. What is the key requirements of deluge system?
Re: Fire and Gas protection system
Dear ranagr,
Will you pl elaborate the service & configuration of the system you are designing to protect?
For offshore facilites: A general area coverage of 10 – 12 Litres min-1 m-2 (LPMM) to protect most platform area against pool fires, with 20 LPMM recommended for pumps/compressors and 60 LPMM for chainlockers (Storage for the anchor chain on the boat / ship)
Goto http://www.hse.gov.uk/offshore/infosheets/is1-2010.htm and read under key performance parameters heading especially.
It will definitely be helpful for you.
Will wait for your response.
Will you pl elaborate the service & configuration of the system you are designing to protect?
For offshore facilites: A general area coverage of 10 – 12 Litres min-1 m-2 (LPMM) to protect most platform area against pool fires, with 20 LPMM recommended for pumps/compressors and 60 LPMM for chainlockers (Storage for the anchor chain on the boat / ship)
Goto http://www.hse.gov.uk/offshore/infosheets/is1-2010.htm and read under key performance parameters heading especially.
It will definitely be helpful for you.
Will wait for your response.
-
ali.abbas
- Core Member
- Posts: 61
- Joined: 25 May 2010, 23:26
- Area of interest: Inst. & Control Engineering
Re: Fire and Gas protection system
Qaiser,
Any idea as to what should the design basis of the sensing network should be for FG Systems?
What I mean is to ask if you are aware of any standards/recommended practices as to what should be the minimum number of gas/fire detectors that should be installed in a given area, what should be the minimum distance between these detetors, what should be the orientation/arrangement of the detectors ... any standards that can answer such questions.
Any idea as to what should the design basis of the sensing network should be for FG Systems?
What I mean is to ask if you are aware of any standards/recommended practices as to what should be the minimum number of gas/fire detectors that should be installed in a given area, what should be the minimum distance between these detetors, what should be the orientation/arrangement of the detectors ... any standards that can answer such questions.
Last edited by ali.abbas on 06 Sep 2010, 03:16, edited 1 time in total.
Regards,
Ali Abbas
Ali Abbas
Re: Fire and Gas protection system
Yes. There are. And interestingly, these standard distances are defined after testing instead of mere calculations only.
For Heat / fire / smoke detectors, the term "UL Listed Spacing" is used. It is the maximum distance between two detectors for effective detection.
UL is "Underwriters Laboratories". It is a US based independent organization for testing & certifying safety products.
When a new product is designed, it is tested by UL & the result is made part of the specification sheet by the manufacturer.
For example,
UL Listed Spacing = 30 ft for SIGA-PHS Intelligent 3D Multisensor Detector. It is a very good Photoelectric detector for Smoke & Heat by GE Security.
If you want to determine the number of sensors, simply draw circles of 15ft radius on a scaled map & cover every corner. Mind the walls!!
For most common sprinklers, the distance is usually 10 ft or you can say every sprinkler covers a circle of 5 ft radius. It changes with K-factor & other specs if you go for some non-common types.
Hope I've managed to give an idea. I'll try my best to satisfy your queries further.
For Heat / fire / smoke detectors, the term "UL Listed Spacing" is used. It is the maximum distance between two detectors for effective detection.
UL is "Underwriters Laboratories". It is a US based independent organization for testing & certifying safety products.
When a new product is designed, it is tested by UL & the result is made part of the specification sheet by the manufacturer.
For example,
UL Listed Spacing = 30 ft for SIGA-PHS Intelligent 3D Multisensor Detector. It is a very good Photoelectric detector for Smoke & Heat by GE Security.
If you want to determine the number of sensors, simply draw circles of 15ft radius on a scaled map & cover every corner. Mind the walls!!
For most common sprinklers, the distance is usually 10 ft or you can say every sprinkler covers a circle of 5 ft radius. It changes with K-factor & other specs if you go for some non-common types.
Hope I've managed to give an idea. I'll try my best to satisfy your queries further.
-
ali.abbas
- Core Member
- Posts: 61
- Joined: 25 May 2010, 23:26
- Area of interest: Inst. & Control Engineering
Re: Fire and Gas protection system
Yeah, thats given me a reasonably good idea. Thanks!!
But this now brings me to another question ... what are the most appropriate type of sensors for detection of hydrocarbon gas that is predominantly rich in methane content?
But this now brings me to another question ... what are the most appropriate type of sensors for detection of hydrocarbon gas that is predominantly rich in methane content?
Regards,
Ali Abbas
Ali Abbas
-
ali.abbas
- Core Member
- Posts: 61
- Joined: 25 May 2010, 23:26
- Area of interest: Inst. & Control Engineering
Re: Fire and Gas protection system
Hullo People,
Can anyone tell me whats must be the SIL level for Fire & Gas Protection Systems for Chemical Process Plant? I understand that the requirement for O&G might be a little different due to the fact that fire can lead to a much more catastrophic failure there. But my question specifically pertains to Process Industry that handles natural gas.
Can anyone tell me whats must be the SIL level for Fire & Gas Protection Systems for Chemical Process Plant? I understand that the requirement for O&G might be a little different due to the fact that fire can lead to a much more catastrophic failure there. But my question specifically pertains to Process Industry that handles natural gas.
Regards,
Ali Abbas
Ali Abbas