System for viscous fluids feeding with ATS pumps Fluids: Surfactant Point: Use pressurized reservoir as fluids reservoir. Pressurized with gas Surfactants have a high viscosity. It is difficult to feed the high viscous fluids at a constant volume by pump itself. Pressurized reservoir Solution: As per the right figure, pour surfactants in a high pressure reservoir. Heat the surfactants to lower the viscosity. By applying gas pressure from the top of the reservoir, it becomes possible to achieve suction at a constant volume with the pump. The pump head section needs to be kept warm to a certain extent. Keep warming.