Selecting a proportioning device that works over a wide range of foam viscosity is therefore of importance. Possibly you end up at 2.5% or lower proportioning rate. Next time, you run another system test and this time it is 5☌. You can run a test and pass with 3,3% (temperature was 15☌).
NFPA tolerances on the proportioning of a 3% foam concentrate = 0 percent to 30 percent (3,0% to 3,9%). Foam agents could be listed in combination with a specific piece of equipment, but having a FM approval does not necessarily mean that particular piece of equipment works with any type of foam agent, or the other way around.
One of the standards that lists foam concentrates and equipment is FM.
0 kommentar(er)
