Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
(OP)
There is one major difference between deluge and closed head system when using foam. With Deluge system, when the system operates, all all head receive foam solution. Only those heads actuated will receive foam solution on a closed head system.
In closed head system, a 4" ratio controller can be used so there must be a minimum flow before foam is generated. With each sprinkler head discharging approximately 16 gpm, at least 25 heads must open to ensure correct operation of foam system. This is a major disadvantage when using bladder tank with closed head foam sprinkler system.
A solution to this issue is to use an Ultra-wide proportioner instead of a ration flow propertioner. The Untra-wide proportioner will proportion correctly at a minimal flow of 20 gpm which is typically one sprinkler head discharging.
Now my question is as follows
1. Is Ultra-wide proportioner is expensive than ratio proportioner
2. Is it easily available in the market
3. Are are any operational and maintenance issues with it.
In closed head system, a 4" ratio controller can be used so there must be a minimum flow before foam is generated. With each sprinkler head discharging approximately 16 gpm, at least 25 heads must open to ensure correct operation of foam system. This is a major disadvantage when using bladder tank with closed head foam sprinkler system.
A solution to this issue is to use an Ultra-wide proportioner instead of a ration flow propertioner. The Untra-wide proportioner will proportion correctly at a minimal flow of 20 gpm which is typically one sprinkler head discharging.
Now my question is as follows
1. Is Ultra-wide proportioner is expensive than ratio proportioner
2. Is it easily available in the market
3. Are are any operational and maintenance issues with it.





RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
To answer your questions:
1 - yes
2 - no more difficult to procure than any other foam system components
3 - Not that I've encountered
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
If we are using closed head sprinklers, AHJ will require an application area more than 0.16 gpm/sft. Therefore, I am planning to use foam density as 0.3 gpm/sft for foam calculations. Lower density with water will result in smaller pump and tank, can I use water density as 0.16 gpm/sft with this application.
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
This is a chemical warehouse where hazardous and flammable chemicals will be stored in a racking system which is around 5 m and warehouse height is 6.5 m.
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
Since sprinkler system is also serving to the tire storage along with chemical warehouse, as per occupancy classification, it can be classified as an ordinary hazard, group-2 (Tire storage & Chemical plant-ordinary)(please verify).
Based on commodity classification, it can be classified as Group B commodity mainly due to the tire storage in an adjacent small storage room.
In rack sprinklers will not be provided as warehouse height is only 7.5 m.
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner
It appears we are in the same place as we were a few weeks ago...
http://www.eng-tips.com/viewthread.cfm?qid=420936
Have you reached out to a fire protection professional yet??
RE: Closed Heads (Wet Type) Water Foam Sprinkler System with Ultra-wide proportioner