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Why mechanical seals fail

Why do mechanical seals fail? Almost every pump has some sort of pump seal. There are always exceptions especially with mag-pumps like Innomag which is just an awesome technology (see more pump options by following this link) but let’s forget about these for now.

Let’s first discuss what a mechanical seal is: A mechanical seal is a mechanical device connecting mechanisms or systems used to stop water leaking between the rotating shaft and the pump housing. We recommend using dish soap to put them together.

Do not use oil or the seal will have issues shortly after installation. This is a first instance of mechanical seals failing. The oil creates a barrier for the fluid to move across and the seal cannot naturally lubricate itself. Also make sure the components (metals and such) being used are chemically compatible both with each other and the fluids being pumped. Another failure is caused when certain components in pump manufacturing are applied incorrectly. If you want to know some quick rules of thumb for o-ring and seal selection drop us a line.

Some fluids that are pumped leave particulate behind as evaporation occurs across the mechanical seal. This overheats and causes premature failure. Some pumps require flush systems across the mechanical seal or even require a pump without a mechanical seal altogether. The few items listed above will give you some instances to check first. After that, please feel free to contact us and ask any questions you have.

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