As a supplier of dual mechanical seals, I've seen firsthand how gas entrainment in the fluid can mess with these seals. Gas entrainment happens when gas bubbles get into the fluid flowing through the system. It might seem like a small thing, but it can have some pretty big effects on dual mechanical seals.
Let's start with the basics. Dual mechanical seals are designed to keep fluids from leaking out of a system. They work by creating a barrier between the fluid and the outside environment. But when there's gas in the fluid, this barrier can get disrupted.
One of the main effects of gas entrainment is on the lubrication of the seal faces. Dual mechanical seals rely on a thin film of fluid between the seal faces to reduce friction and wear. When gas bubbles are present in the fluid, they can break up this lubricating film. This leads to increased friction, which in turn generates more heat. The extra heat can cause the seal faces to warp or crack, reducing the seal's effectiveness and shortening its lifespan.
For example, in a pumping system where a MOR 102 booster pump mechanical seal is used, gas entrainment can make the seal faces rub against each other more vigorously. This not only wears down the seal faces faster but can also lead to vibrations in the pump. These vibrations can further damage the seal and other components of the system.
Another issue is the impact on the pressure distribution across the seal. Gas bubbles in the fluid can create uneven pressure areas. The seal is designed to operate under specific pressure conditions, and when the pressure distribution is off, it can cause the seal to malfunction. The seal might not be able to maintain the proper contact between the faces, allowing fluid to leak past the seal.
In some cases, the gas bubbles can also cause cavitation. Cavitation occurs when the pressure in the fluid drops below the vapor pressure of the gas, causing the bubbles to collapse. The collapse of these bubbles creates shock waves that can erode the seal faces and other parts of the seal. This erosion weakens the seal and can lead to catastrophic failure.
When it comes to the performance of different types of dual mechanical seals, gas entrainment can affect them in various ways. Take the MOR LBG Cartridge Metal Bellow Seal. The metal bellows in this seal are designed to provide flexibility and compensate for axial movement. However, gas entrainment can disrupt the smooth movement of the bellows. The gas bubbles can get trapped in the bellows, preventing them from expanding and contracting properly. This can lead to misalignment of the seal faces and reduced sealing performance.
Similarly, the MOR MFL95N metal bellows seal can also be affected. The metal bellows in this seal are crucial for maintaining the correct contact pressure between the seal faces. Gas entrainment can cause the bellows to lose their elasticity over time. As the bellows become less flexible, they can't adjust to changes in the system, such as temperature or pressure variations, leading to seal failure.
Gas entrainment can also have an impact on the reliability of the overall system. When a dual mechanical seal fails due to gas entrainment, it can cause downtime in the process. This downtime can be costly, especially in industries where continuous operation is essential, like chemical processing or oil and gas production.
To deal with these issues, it's important to take preventive measures. One way is to use gas separators in the system. These separators can remove the gas bubbles from the fluid before it reaches the seal. Another option is to select a dual mechanical seal that is more resistant to gas entrainment. Some seals are designed with special features, such as improved face materials or better fluid flow paths, to handle gas bubbles more effectively.
If you're facing problems with gas entrainment in your system and need a reliable dual mechanical seal solution, don't hesitate to reach out. We have a wide range of high - quality dual mechanical seals that can be customized to meet your specific needs. Whether it's dealing with high - pressure applications or aggressive fluids, our seals are designed to perform under challenging conditions.
Contact us to discuss your requirements and let's find the best dual mechanical seal for your system. A proper seal can save you from costly downtime and maintenance, ensuring the smooth operation of your equipment.
References
- "Mechanical Seals Handbook" by John Neale
- "Fluid Mechanics and Its Applications in Sealing Systems" by David Smith
- Industry reports on the performance of dual mechanical seals in gas - containing fluids
