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cpp PLANTS, APPARATUS, COMPONENTS Chemical-dosing systems at two U.S. based locations Preparing the ground Cooling and boiler water of power plants on the premises of chemical factories must be conditioned in a similar way to the water of large-scale power plants. This is an important basis for an efficient energy supply when manufacturing substances such as fertilisers. During the water treatment, various chemicals are added by special dosing stations. Designing such dosing equipment for the U.S. market turns out to be challenging, though. MPT of Rodgau (Germany) was commissioned by Thyssen Krupp Industrial So - lutions to furnish two U.S. based chemical plants operated by CF Industries with 27 dosing systems. Four dosing stations for oxygen scavenger, amine, phosphate and caustic were erected in Donaldsonville, Louisiana. Two dosing stations for each of seven other fluids were also installed there: surfactant, dispersing agent, corrosion inhibitor, sodium bromide, sodium hypochlorite, sulphuric acid and sodium hydroxide. One dosing system for each of the following media was shipped to Port Neal, Iowa: oxygen scavenger, ammonium hydrox ide, sodium hypochlorite, corrosion inhibitor, dispersing agent, sodium bromide, non-oxidising biocide, sulphuric acid and sodium hydroxide. Each of these stations basically consists of a storage tank, which is filled by means of gravity or compressed air, as well as two or more dosing pumps. The pumps for each dosing line are embedded in a redundancy concept: if one pump fails, the other one cuts in automatically. alone, the operator wanted them to have a uniform design to ensure ease of installation, operation and maintenance. Finally, they had to be sufficiently robust to last for many years.America uses Imperial rather than metric units, meaning that all tanks and flanges had to be secured with Imperial size bolts. Furthermore, the dimensions of the dosing stations in all general arrangement drawings are in feet and inches while the weights are in pounds. These dimensions and weights formed the basis for the customer’s wind load calculation. The component parts were coated according to a Project requirements American dosing pumps were installed in this project in order to permit maintenance within the U.S.A. The entire electrical equipment – such as motors, transmitters and switches – had to be U.S.-certified either by FM Global, a mutual insurance company located in Rhode Island, or by UL, the Illinois based safety consultant. The pressure gauges and flow indicators likewise had to be appropriately designed. Since 18 dosing systems were delivered to Donaldsonville Pump assemblies as part of dosing stations. At the bottom right, there is a calibration pot. Pictures: MPT 36 cpp 03-2017
