OK, sorry about my short response. I just get a little tired of writing detailed analysis that I'm unsure if they are properly interpreted.
IFC Section 3404.2.9.4 is the particular code section that is at issue:
3404.2.9.4 Above-ground tanks inside of buildings. Tanks storing Class I, II and IIIA liquids inside buildings shall be equipped with a device or other means to prevent overflow into the building including, but not limited to: a float valve; a preset meter on the fill line; a valve actuated by the weight of the tanks contents; a low head pump which is incapable of producing overflow; or a liquid-tight overflow pipe at least one pipe size larger than the fill pipe and discharging by gravity back to the outside source of liquid or to an approved location.
As written any stationary aboveground storage tank (AST) containing a Class I, II or IIIA liquid located inside of a building requires overfill protection. The problem with this provision is that overfill protection devices for small (<1,000 gallon) tanks require that the tank have a minimum 2-inch opening. I am only aware of two manufacturers of overfill devices for these small tanks (Clay & Bailey and some outfit out of France who builds a really complicated device called a Minnow) and both require a tank with a 2-inch opening. I suspect Travis's tank has a 1 1/2-inch tank fill connection.
So how does one get around this? First, talk to the code official and explain that original equipment manufacturered (OEM) overfill devices require a minimum 2-inch opening and for smaller diameters, the design would require a liquid level transmitter interfaced with a programmable logic controller connected to a electric solenoid valve. This arrangement costs more than the value of the tank, requires good engineering and is is not justified by the loss history for fire pump rooms or houses.
Secondly is that the 2006 IFC exempts fuel oil systems less than 660 gallons. Footnote "i" in Table 2703.1.1(1) exempts fuel oil systems with a volume < 660 gallons provided the installation complies with the requirements of the IFC. A fuel oil system under the requirements in IFC Section 603 does not require an overfill prevention device or system.
The other item to consider is that many of the ASTs built for fire pump installations are listed assemblies (as my memory recalls) so modifying them could be construed as a violation of their listing.
Someone needs to explain to tank manufacturers that the IFC has a particular requirement which none of them comply with for overfill protection. I think an argument as I have presented would be accepted as a basis for changing the IFC so long it was limited to tanks with a volume < 660 gallons. You guys and gals are purchasing the equipment and the manufacturers need to understand they are currently selling equipment that does not comply with the IFC.
And for more fun and irritation, the 2009 IFC will have new requirements for fuel oil systems that are more detailed and complicated.
Merry Christmas, Happy Hanukah or Joyous Kwanza. Scott
