What is a Seal Pot

Have you ever wondered what a seal pot is and how it relates to mechanical seals?

A seal pot is a crucial component in many sealing systems, designed to enhance the performance and longevity of mechanical seals.

In this blog post, we’ll dive into the world of seal pots, exploring their purpose, function, and the benefits they bring to industrial applications.

By the end, you’ll have a clear understanding of how seal pots optimize mechanical seal performance and reliability.


What is a Seal Pot

A seal pot, also known as a seal reservoir or seal flush tank, is an essential component in mechanical seal systems. It serves as a vessel that contains a barrier fluid, typically a clean, compatible liquid, which helps to lubricate, cool, and protect the mechanical seal.

How does seal pot work

The seal pot works by continuously supplying the mechanical seal with a clean, pressurized barrier fluid.

The seal pot maintains a constant fluid level above the mechanical seal, ensuring a consistent supply of flush fluid. This positive pressure helps to keep contaminants away from the seal faces, reducing wear and extending seal life.

As the mechanical seal operates, a small amount of barrier fluid is allowed to leak into the process fluid, creating a stable fluid film between the seal faces. This film helps to lubricate and cool the seal, reducing friction and wear while extending the seal’s lifespan.

Components of seal pot

  • Reservoir: Holds the barrier fluid that lubricates and cools the mechanical seal faces.
  • Pressure Gauge or Transmitter: Allows operators to monitor the pressure of the barrier fluid.
  • Sight Glass: Enables visual inspection of the barrier fluid level within the reservoir.
  • Pressure Regulator: Ensures that the pressure remains within the specified range for optimal mechanical seal performance.
  • Cooling Coil: Helps to dissipate heat from the barrier fluid, preventing excessive temperature rise that could damage the mechanical seal (included in some designs).
  • Fill Port: Allows for the addition of barrier fluid to the reservoir.
  • Drain Port: Facilitates the removal of fluid for maintenance or replacement purposes.
  • Additional Components (depending on application and system requirements):
  • Level Switches
  • Alarms
  • Temperature Sensors

Function of Seal Pot

  • Maintains constant fluid level: The seal pot keeps a steady fluid level above the mechanical seal, ensuring lubrication and cooling to prevent excessive wear and premature failure.
  • Minimizes pressure fluctuations: It provides a stable fluid source, minimizing pressure fluctuations at the seal faces, which is crucial for proper sealing and leakage prevention.
  • Acts as a fluid reservoir: The seal pot serves as a reservoir, supplying additional fluid to compensate for any leakage or evaporation, thus extending the life of the mechanical seal.
  • Introduces barrier or buffer fluid: In some cases, it can introduce a barrier or buffer fluid into the sealing system, protecting the seal faces from damage or contamination.
  • Monitors seal condition: The seal pot allows monitoring of the mechanical seal’s condition through changes in fluid level, pressure, or temperature, enabling proactive maintenance and preventing unexpected downtime.

How to Install Seal Pot

Step 1: Prepare the Installation Site

Identify a suitable location for the seal pot, ensuring it is close to the mechanical seal and easily accessible for maintenance. Clean the area thoroughly and remove any debris or obstructions that may interfere with the installation process.

Step 2: Mount the Seal Pot

Securely mount the seal pot to a stable surface using the provided brackets or mounting holes. Ensure that the pot is level and properly aligned with the mechanical seal to prevent any strain on the connected piping.

Step 3: Connect the Piping

Connect the piping from the mechanical seal to the inlet and outlet ports of the seal pot. Use appropriate fittings and gaskets to ensure a leak-free connection. Double-check the connections to ensure they are tight and secure.

Step 4: Fill the Seal Pot

Fill the seal pot with the recommended barrier fluid, typically a compatible lubricating oil or glycol-based solution. Follow the manufacturer’s guidelines for the proper fluid level and type to ensure optimal performance and protection of the mechanical seal.

Step 5: Pressurize the System

Pressurize the seal pot system according to the manufacturer’s specifications. This is typically done by connecting a nitrogen or air supply to the pressure inlet port of the seal pot. Adjust the pressure regulator to maintain the desired pressure level.

Step 6: Monitor and Maintain

Once the seal pot is installed and pressurized, regularly monitor the system for any leaks, pressure fluctuations, or abnormal conditions. Perform routine maintenance, such as checking fluid levels, replacing barrier fluid, and inspecting connections, to ensure the long-term reliability and performance of the mechanical seal and seal pot assembly.


What are the common types of fluids used in a seal pot?

Common fluids used in seal pots include water, glycol, oil, or other compatible liquids that provide lubrication and cooling to the mechanical seal.

How is the pressure maintained in a seal pot?

The pressure in a seal pot is typically maintained using a pressurized gas, such as nitrogen, or by connecting it to a higher-pressure external source.

What materials are seal pots typically made from?

Seal pots are usually made from stainless steel, carbon steel, or other materials compatible with the barrier fluid and the process environment.

How often should the barrier fluid in a seal pot be replaced?

The frequency of barrier fluid replacement depends on factors such as the type of fluid, operating conditions, and manufacturer recommendations, but it typically ranges from weekly to monthly intervals.

Can a seal pot be used with all types of mechanical seals?

Seal pots are compatible with most types of mechanical seals, including single, double, and tandem seals, but it’s essential to consult the seal manufacturer for specific recommendations.

In conclusion

A seal pot is an essential component in a mechanical seal system, serving as a reservoir for the barrier fluid. It helps maintain the required pressure and flow rate for the mechanical seal to function properly.

For more information on seal pots and mechanical seals, contact a trusted seal supplier today.

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