Firefighting foam dispensing system TPW MK3

waterin-line

SKUM TPW MK3 wide range proportioning systems function by metering foam concentrate into the water supply line. Upon system actuation, incoming water applies pressure to the concentrate in the bladder, which supplies pressurized concentrate to the proportioning device. The foam-water solution is then piped to the discharge devices in the hazard area. Each proportioner consists of the following components: Cast bronze body Bronze deflector Stainless steel spring Stainless steel foam metering tube The proportioner is available in three standard sizes (6 in., 8 in., and 10 in.) and is designed to fit between two DN 150 (6 in.), DN 200 (8 in.), or DN 250 (10 in.) DIN PN16 (ANSI Class 150) pipe flanges. A minimum of five pipe diameters of straight pipe is necessary upstream and downstream of the proportioner. When installed in a closed-head, wet sprinkler system, the proportioner operates in the following way: 1. With the proportioner correctly installed in the sprinkler riser, the water pressure is equal on both sides of the proportioner. 2. As the sprinkler heads open in a fire situation, foam concen trate enters the water stream through a precisely machined metering tube. 3. As more sprinkler heads open, the increase in water flow causes the deflector to open further, increasing the orifice size on the metering tube. This causes more foam concentrate to enter the water stream. This feature gives the proportioner the ability to correctly proportion at both extremely low flow rates and at extremely high flow rates.