Sealing System for Tank Rotary Shaft

摘要

A seal arrangement allowing in-line maintenance and replacement of packing, seals and bushings of a rotary shaft driving a tool extending inside a fluid holding tank. The rotary shaft and associated seals are mounted in an extractable cartridge removably insertable in sealing engagement within a housing projecting outwardly from the tank. A secondary seal comprises an isolation valve mounted to the housing outside of the tank for temporarily providing sealing during servicing of the seals in the extracted cartridge. A tertiary seal is provided for protecting the secondary seal from the tank contents when used in scaling environments. Removable parts of said seal arrangement

主权项

1. A seal arrangement for sealing a rotary shaft (14) and a shaft opening defined in a wall of a tank (12) containing a flowable material, sealing around the rotary shaft (14) being provided by a primary seal (40, 50) mounted with said rotary shaft in an extractable cartridge (32), the seal arrangement comprising a secondary seal (34) operational for closing the shaft opening when removing the primary seal (40, 50) for maintenance or replacement, characterized in that the extractable cartridge (32) is removably insertable in sealing engagement within a housing (35) projecting outwardly from the tank (12) around the shaft opening, and in that the secondary seal (34) comprises an isolation valve mounted to said housing (35) outside of said tank (12).