Mechanical seal support system plan 53B is used in high steam pressure, flash hydrocarbon, dangerous and poisonous processing media, easy conductive media, dirty/ containing solids or easy polymeric media etc.

API Plan 53B is a sealing support system that uses a gas filled bladder accumulator to maintain pressure difference in a double sealed system to prevent loss of sealing fluid during normal operation or unexpected situations. This system is usually used in conjunction with dual mechanical seals and an isolation fluid is added to the sealing fluid. The advantage of the Plan 53B system is that it does not allow gas to dissolve into the sealing liquid, which allows it to operate at higher pressures than the Plan 53A.

The Plan 53B system is a closed loop piping system that circulates and isolates liquids between sealed double seal arrangements to cool and lubricate the inner and outer seals. The system provides circulation through an internal pump ring and uses a heat exchanger to remove heat.

The Plan 53B system typically includes the following components:

Bag type accumulator: used to isolate pressurized gas and liquid, and provide a pressurized system with a pressure higher than that of the sealed process.

Heat exchanger/seal flush cooler: used to remove additional heat from the inner seal when neededManual pump: used for low capacity and high pressure operations.

Pressure and temperature sensors: used to monitor the pressure and temperature of isolated liquids.

In addition, The Plan 53B system also has the following characteristics:

By using a gas filled bladder accumulator, gas dissolution into the isolation liquid is prevented.

The system is designed for high-pressure applications and can prevent a significant pressure drop in the sealing fluid, as a gas (usually nitrogen) that can store energy is used to pressurize and isolate the circuit.

The system is equipped with alarm setpoints for supplementary alarms in the isolation system, which can be based on fixed or floating pressure according to the selected strategy.