Plan 53B

Position:

Between inner and outer seal (double seal)

Description:

A bladder accumulator, in combination with a barrier fluid system, provides a pressurized barrier fluid for the 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 system is pressurized directly in the barrier fluid, supported by a gas cushion in the bladder accumulator which is separated from the barrier fluid.

The circulation of the barrier fluid is carried out by a pump device in the mechanical seal.

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 pressures in the seal chamber (high pressure of the barrier fluid required)
• At constant pressure in the seal chamber
• 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 under high pressure 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. The bladder accumulator prevents absorption of gas into the barrier fluid.