STPs are installed directly into the underground storage tank. The pump intake is set a few inches off the tank bottom. The pump is itself of the centrifugal type which pressurizes the fuel through the motor of the pump up through the riser and the STP control head. The fuel under pressure is pushed up by the pump motor through the piping system to the dispenser. Mainly one STP is user per product grade. Blending systems are those in which two product grades are blended into a variety of grades at the dispenser. The number of STPs that are required per station has been reduced to only one for regular and one for premium product grade by these blending systems. Blend systems are rapidly getting more popular as they require fewer tanks, STPs, and nozzles and less underground piping. Multiple gasoline grades that are offered by the entire stations can now be operated with very little as around two STPs.
The purpose of water treatment is to provide quality to the water for safe consumption or for safe release to the environment. For producing potable water from surface water requires water treatment and it typically comprises chemical and physical separation processes that remove constituents from the water and for killing or deactivating the disease-causing microorganisms and viruses. By using flocculation, flash mixing, sedimentation basins along with sand filters or membranes, the physical removal can be done. Metering pumps are recommended for the disinfection process in both water and wastewater treatment plants. Normally one of the final processes before the discharging to the distribution system or releasing of the effluent disinfection is normally done. This final step ensures that any disease-causing or pathogenic microorganisms are reduced substantially and the water is safe for consuming or releasing to the environment. The effectiveness of the disinfection depends on the state of the water or the effluent that is being treated. The type of disinfection that is being used, the dosage of the disinfectant, and all the other environmental variables. A screw pump is a type of rotary pump that remains equipped with screws that mesh together and rotate within a cylindrical cavity or liner. From the suction side of the pump, the fluid enters and moves linearly along these intermeshing screws to the discharge of the pump. The screws and the liner have very small clearance and for that the fluid gains pressure while moving through the pump. Depending on the usage there are several types of screw pumps available of various designs. Dutco Tennant LLC supplies a wide range of Wastewater Pumps for STP.