Proportional RTP system provides a water/foam solution at guaranteed foam percentages for World Series Pumps. System will provide 3% or 6% Class B foam content in water flows and maintain these percentages as water flow varies. The system is suitable for all commercially available Protein, Fluorocarbon and AFFF compounds and is designed to operate with water flow rates of 200 to 3000l/min. Based on the field-proven round-the-pump foam system (RTP) the system parameters are +/- 20% between 200 to 400 l/min water flow rate and +/- 10% for flows between 400 and 3000 l/min.