The MCCR line from Duechting is based on the MCC series pumps that are used worldwide and achieve a very long service life under unfavourable environmental conditions. This is largely due to the special material from which they are made. Components that are in contact with the media, such as the housing and impeller are fabricated using mineral castings — constructed of SICcast— rather than high-alloy stainless steel or rubber-lined steel.
This SICcast material is produced by another company in the Duechting Group. Using a silicon carbide/binder mixture as the base the components are cast in the desired shape via pressure less casting and then undergo heat hardening for outstanding performance. These components are completely resistant to corrosion and have extremely high hardness. In addition, they are abrasion-resistant, resistant to thermal shock, and impact-resistant.
With this profile of properties, the SICcast material is ideally suited for pumps that transport abrasive and/or corrosive media. The MCC pumps, which Duechting produces in eleven sizes with nominal widths from 400mm to 1000mm for volume flows of up to 20,000 m3/h (at 6 bar), have proven themselves for years. In addition to the special material used, this line of pumps also features, among other things, the high-efficiency DÜTEC-C cartridge mechanical seal developed by Duechting, as well as a maintenance-friendly design. The complete impeller set can be removed without disassembling the spiral housing from the pipe assembly.
Since numerous power plant operators, particularly in the USA, have used other types of absorber recirculation pumps in the past and have not been satisfied with their service life, this retrofit was an obvious choice. The MCCR line offers all the advantages of the MCC series with adapted fitting sizes for flanges and drive shafts, as well as other dimensions which enables retrofits into existing pumping stations without any other modifications.
An American power plant operator has already installed one of the first MCCR pumps with a SICcast housing and impeller using it as a replacement to their outdated equipment. The pump was installed within a short time with minor modification to the base frame and utilized the customers’ existing motor, gear box, and coupling.
After the mineral cast retrofit pump had operated under the adverse conditions of flue gas desulfurization for an entire year without failure or any signs of wear and tear, the operator decided to switch all absorber recirculation pumps in the power plant complex to the MCCR line.
In other cases, pumps from the proven MCC line with SICcast housings and impellers can also be used to retrofit existing pump stations. Due to the wide range of pump hydraulics available, Duechting offers the right pump for nearly every flue gas desulfurization application.