Which is the Better Seal – Gland Packing or Mechanical Seal?
Gland packing and mechanical seals both are very important components of shafts and pumps. Countless engineering applications rely on these devices to properly function.
Although seals and packings have similar functions, using either depends on budget, personal preferences, and more importantly, application requirements. For example, rotary pumps work best with seals because they are capable of collecting, treating, and filtering fluid leakage. On the other hand, there are applications where a packing is the more appropriate choice, such as settings with corrosive surrounding, which happen to cause seals to deteriorate faster. If this is the case, a packing will last longer.
There are several other pros and cons to using either seals or packing. Below is a short comparison between a gland packing and a mechanical seal. mechanical seal company
Gland Packing – Does It Do the Job?
Gland packing is also known as the conventional shaft seal. Many engineers don’t recommend packings for a lot of applications due to the requirements and costs of maintenance. Sealing off liquids or gases isn’t as effective either, as a packing is prone to occasional leakage. You need to regularly adjust so that the seal is well-lubricated.
There’s also the problem of abrasive liquids causing corrosion. This usually takes a toll on the life span of a gland packing, thus forcing you to spend more on replacements and repairs.
On the bright side, there are cases where packings out perform seals. They’re good with handling aggressive fluids, for example. Packing earns another point due to its performance in case there is leakage because it’s easy to adjust to keep the pump fully functional. You can’t do this with seals because you’d have to take the pump out of service.
Applications that involve ball valves, gate, globe, and valve cocks also go in favour of packing since seals need rotary motion to be able to seal off anything. It is exactly this reason that gland packings are integrated in reciprocating pumps.
Mechanical Seals – What Makes Them Any Good?
When it comes to popularity, seals win. They are implemented in a lot more applications partly because they cause very few leak problems, and they are practically maintenance free.