The Ahlstrom Ahlstar pumps are an extremely popular pump found in paper mills across the United States. Most commonly found in the white and black liquor process as well as the digester process, these pumps have proven to be robust and reliable in paper mills.
Usually the Ahlstar line is equipped with a labyrinth from the OEM. Which has commonly been found to have an oil leakage issue. Many customers have tried other style labyrinths which typically fair better on the leaks. However since most of these pumps are stationed in wet and steamy areas, the bearing housings have issues with water vapor ingress. Isomag magnetic bearing isolators are a positive seal and will hold oil in, and keep the external contaminates out of the bearing housing. Many customers from International Paper, West Rock, & Domtar Paper have found Isomag bearing isolators to be their best solution for maintaining their maintenance lifetime goals.
A brochure for Isomag magnetic bearing seals that fit your Sulzer / Ahlstrom Ahlstar pumps can be found here. Also as a reminder, Isomag bearing isolators can be custom made to fit your machine. Contact our customer service team and we will help you find the ideal solution for your needs.