A large calcium carbonate producer uses monopumps to transport this product. The pumps are fitted with a new stopper box each month. This is labor intensive, but does not solve the leakage of the stopper box. There is a lot of cost of cleaning the pumps and much of the product is lost, which in itself is already a significant loss item.
The Sellon solution
The solution found was replacing the stopper sealing rings by Chesterton CMS 2000 in combination with Chesterton style 1727 top and bottom gasket ring.
Chesterton CMS 2000 forms an endless composite ring between the bottom and top ring in the gasket and shaft or shaft bus. The leakage is eliminated and no water purge is required. CMS 2000 does not provide visual leakage and save on maintenance costs.
Accumulated shafts or shaft buses belong to the past and contribute to cost savings. Also, the CMS 2000 is easy to maintain even with rotating equipment. By means of a supplied injection pump, the CMS 2000 is introduced via a ball valve which is in communication with the packing chamber.