Mechanical Seals are found in a large percentage of pumps and their job is to prevent the leakage of liquid from around the rotating pump shaft. The mechanical seal is an important component of the pump in that it plays an integral part in stopping product loss which can not only be expensive but also harmful to the environment.
Although the expected service life of mechanical seals has increased in recent decades and there are various sealing face material options available to better suit the product being pumped, the seals can and will fail.
The question you have to ask is, ‘has it failed prematurely’, particularly if it is a recurring issue. This is an important question to answer because if you simply repair the pump by replacing the mechanical seal and the underlying issue which caused the problem still exists, you may be repeating the exercise sooner than you would like.
To answer this question, you need to do some investigation along with having some understanding of the fundamentals of mechanical seal design and operation. Therefore, you may require some assistance from somebody more experienced in these matters. See www.betterpumps.com.au.
If a mechanical seal fails, there could be a number of reasons and sometimes you need to look below the surface and find the root cause of the problem if it is a premature failure.
For example, a couple of common causes of mechanical seal failure are excess vibration that is transmitted through the seal faces and lack of lubrication between the seal faces.
If we look at the first example of vibration then we need to find what is causing the vibration and that could possibly be cavitation while the pump is operating. In that situation, the cavitation is the root cause of the problem and solving the cavitation issue will get rid of the vibration.
Also, if we look at the second example of a lack of lubrication, again we need to dig a bit deeper. In this situation, we would need to address what is starving the pump at times of the fluid it is pumping as that is what is causing a lack of lubrication.
So, what are the possible causes of mechanical seal failure and what can be done to eliminate the problems?
Well, the reasons for the failure of a mechanical seal in any pump can be numerous. The main priority is to find any underlying root cause of an unexpected mechanical seal failure and provide a good working environment for the seal. You can then expect reliable service from your mechanical seal as a part of your pumping equipment.