The basis for all other following steps is to select an adequate material for the nozzles and the accessories. Also the life-time of these components depends on the material and the atmosphere they are used in. Keep in mind that the chemical resistance of the material depends very much on the specific operation conditions (such as temperature, acid concentration, residence time, mechanical stress, etc.).
In the turbulence pickling section the nozzles have to offer a homogeneous liquid distribution over the entire material width. At the same time they are responsible for creating turbulence in the pickling liquid. The nozzle sprays have to force continuously the heated acid into the cracks of the scale layer on the strip. This is most important for an effective pickling and helps to accelerate the chemical process which will lead to an optimum capacity of the entire line. Flat jet nozzles could fulfill these demands in perfection. Whenever possible a staggered nozzle arrangement should be preferred to avoid any linear spray pattern on the strip. Furthermore, optimal overlapping of the adjacent sprays is a fundamental factor when defining the nozzle arrangement.
The rinsing section is absolutely decisive as it has to stop the chemical reaction and prevent over-pickling. An effective rinsing by an appropriate nozzle installation has a significant influence to the optimum result. Areas with a lower rinsing water density or even gaps in between the sprays could lead to severe quality issues. Therefore, an adequate nozzle selection and arrangement with an even liquid distribution is as important as good maintenance work.