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 (14) driving a tool (10) extending inside a fluid holding tank (12). The rotary shaft (14) and associated seals (40, 50) are mounted in an extractabie cartridge (32) removably insertable in sealing engagement within a housing (35) projecting outwardly from the tank (12). A secondary seal (34) comprises an isolation valve mounted to the housing (35) outside of the tank (12) for temporarily providing sealing during servicing of the seals in the extracted cartridge (32). A tertiary seal is provided for protecting the secondary seal (34) from the tank contents when used in scaling environments. Removable parts of said seal arrangement.