The SFPE Handbook and various vendors advise that subsurface injection of foam is not recommended for internal, floating roof tanks. Are there any studies or incidents that support this position?
I had a reply to this question outside of the Exchange. I have pasted the comments below of those interested in this topic. Any additional comments are appreciated. Thanks
NFPA 11 Standard for Low, Medium and High Expansion Foam (2016)
Note to Table 184.108.40.206.8
(3) The most viscous fuel that has been extinguished by subsurface injection where stored at ambient conditions [15.6°C (60°F)] had a viscosity of 2000 SSU (440 centistokes) and a pour point of −9.4°C (15°F).
Subsurface injection of foam generally is not recommended for fuels that have a viscosity greater than 440 centistokes (2000 SSU) at their minimum anticipated storage temperature
220.127.116.11 Subsurface and Semi-subsurface Injection. Subsurface and semi-subsurface injection shall not be used for protection of open-top or covered floating roof tanks because of the possibility of improper distribution of foam at the fuel surface.
This company may have some information to help you::
sorry have to spell it out
Just put it together
Retrieving data ...