Application of external unpressurized tank for feeding buffer liquid to external unpressurized double sealing system. During normal operation the circulation is forced and maintained with an internal pumping ring. The tank is normally vented continuously to the gas recovery system and the pressure in it is lower than the pressure in the gland box.
This system comprises a buffer liquid tank, necessary connectors and valves and control and measuring equipment. This installation is applied in case of liquids which crystallize in contact with the air, which can be environmentally hazardous. The main functions of buffer liquid involve, among other things, seal lubrication and cooling as well as washing sealed liquid out of the seal.
