Polymer resins are raw materials for Beckers’ paint production. Untill now, resins have been received in 1000l IBC containers, but in order to improve safety and reduce wastes it was decided to supply resin raw materials by tanker trucks in the future, and new tank farms have therefore been built.
So far, 4 storage tanks have been implemented to store the resin received by trucks. Each tank is heated to provide a minimum temperature around 30°C for correct viscosity.
Each tank on the plant has been equiped with 1 DESMI ROTAN® ED81 internal gear pump installed on top of the tank. During the project time, attention has been paid to NPSHr compatibility as the pumps shall be operated with liquid levels down to 3 meters under suction flange.
Due to environment constraints, Beckers has required no leakage technology for pumps to avoid any contamination of the environment, especially in regards to a wild river running along the plant. The ROTAN® ED pump was a perfect match, as the pump is magnetically coupled for ultimate protection against leakage. At the same time the pump is ATEX approved.
To limit the wear with acceptable costs, bronze bearings have been chosen, and the pump speed has been limited to 350 rpm max, but can be less, especially when resins are more viscous or demand on production lines are lower.
To match all requirements, each unit is operated with various frequency drives to adapt the flow to the plant requirements and to optimize starting of the pumps.
All pumps have been equiped with PT100 on the casing and magnets to comply with ATEX requirements.
A primary manually filling tank has been installed close to the pump for pump filling on the first start. Once pumps have been started, remaining resin inside the pump casing is enough to provide correct suction of the liquid in the tank for the following starts.
Technical specifications:
4 x ROTAN® ED81 1U22 for Resin handling
Viscosity: Around 2500 cst, max 5000 cst at starting
Pumping temperature: 35°C min
Flow: 5-10 m3/h
Discharge pressure: Up to 10 bars
Motor: 5,5KW 4 poles with VFD
Gear output speed: 350 rpm max
Minimum liquid height at suction: 3m under the pump suction
website