Efficiently designed Cleaning In Place (CIP) systems allows the industry a reproducible and economical cleaning of their machines, systems and components. But CIP processes have the disadvantage that the whole industrial plant must be flushed until the hardest to reach area is cleaned. In particular, dead ends at valve clusters or T-pieces for the integration of sensors are often found in industrial plants but generate critical areas for cleaning. These critical areas are characterized by a low flow velocity. But in closed equipment, especially the flow velocity has an essential influence on the removal of soil layers. Due to insufficient cleaning studies of dead spaces the machine designer has no clear recommendations regarding an acceptable T-piece length and the CIP-system operator lack knowledge on the parameterization of cleaning processes to increasing the cleaning rate in dead spaces.
In this project, the local cleaning behaviour is determined in a dead space (T-piece) depending on the relative length (L/D) of the dead space. For this purpose, a flow channel is constructed with variable length of the dead space. It is examined the temporal and local removal of a luminescent starch layer. In this way the critical area depending on the length of the dead space is determined for the first time. Finally, recommendations concerning the design of T-pieces are made and the results are discussed with existing publications.
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