We recently conducted a proportioner test on a foam-water deluge sytems where the system has a designed 2 1/2" test port off a 8" riser main. The BPP proportioner is expected to provide 3% proportioning rate at a minimum flow rate of 1600 liters/min. The deluge system demand is 1641 gpm at 85.6psi. The system test configuration provided a flange assembly just after the 2 1/2" test port so blinds could be installed to prevent foam from being released inside the building. After running the system at the foam system manufacturer recommend run time of 1 minute, no foam product was realised out of the 2 1/2" test port; same result with a 3 minute and 5 minute run time. Should the test port/ configuration be sized to match the 8" mains in order to test the proportioner properly as to allow the proportioner to be supplied with the minimum flow rate of 1600liters/min?