This type of plant is being offered typically for the customers who have variety of components being handled or geometry of the components does not allow them to go with spray Pre-treatment plant. This type of plant is very simple in nature. Depending on the chemical supplier, the numbers of process/tanks are decided. The tanks are made out of 3.15 -5.0 mm thick HR sheets. Our tank design will have minimal reinforcement; whereas strength of the tank has been taken care by formed sheets. In the cases where, SS tanks are opted, then we restrict to 3.0mm thick SS either SS-304 or SS-316 depending on the chemical supplier.
We always propose to have two water rinse tanks after the de-rusting with FRP/PP lining. And after the phosphate process tank, the rinse tank will also have FRP/PP lining. We have several options of heating system for the Pre-treatment tanks. The following are the same. (a)Direct bottom fitted HSD/LPG fired heating system. (b) Pressurized Hot water system with piping inside the tank (c) Electrical heating system (d) Plate heat exchangers and (d) Developing the latest hybrid solar heating system.
In case of phosphate, we prefer to have tank in tank-heating system as shown below. The inner tank would be SS and the outer tanks can be MS. The material handling system would be either TRANSPORTER controlled by PLC or simple monorail/twin rail hoist.
The tanks are built with a facility for drainage, overflow, cascading, agitation and water inlet. The heating tanks are insulated with 48 kg/m3 rock wool with proper cladding work. These tanks are modular in nature and can be shifted to any where or any place.
The controls are provided to control heaters/burners, automatic door and temperature.