Plan 54

Position:

Between inner and outer seal (double seal)

Description:

An external system provides a suitable pressurized barrier fluid for inner and outer seal. The pressure of this barrier fluid is at least 1.4 bar (0.14 MPa) above the pressure in the seal chamber.

The circulation of the barrier fluid is carried out by the external system (e.g. by a circulation pump).

Common use:

• To eliminate leakage of the medium to be sealed to the atmosphere
• For dirty, solid containing or polymerizing media to be sealed
• In applications where sealing operation by the medium to be sealed itself is not possible
• At high process temperatures
• In applications where internal seal pump device cannot provide sufficient flow rate
• To prevent dry running of the process-side (inner) seal
• For cooling the process-side (inner) mechanical seal
• For cooling the non-process-side (outer) mechanical seal

Application example:

Sealing of abrasive-containing hydrocarbons at high temperature in pumps with double-acting mechanical seals to eliminate leakage (medium to be sealed) to the atmosphere, as well as for lubrication and cooling of the seal faces.