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Anonymous Poster #1

Seal

08/02/2018 9:11 AM

what is the difference between dry & wet seal

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#1

Re: Seal

08/02/2018 10:22 AM

The wet seal has just been set, while the dry one was allowed to cool...

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#2

Re: Seal

08/02/2018 11:36 AM

Dry seal

Wet seal

You knew this.

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#3
In reply to #2

Re: Seal

08/02/2018 11:46 AM

Thanks, now I have to clean coffee off of my monitor again!

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#5
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Re: Seal

08/02/2018 12:52 PM

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#6
In reply to #5

Re: Seal

08/02/2018 7:08 PM

That appears to be a mechanical wet seal, is that correct?

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#7
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Re: Seal

08/02/2018 7:36 PM

A new 3-D printed one....!

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#8
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Re: Seal

08/02/2018 8:29 PM

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#10
In reply to #6

Re: Seal

08/04/2018 4:54 AM

It appears to be a sea lion; a wet applausive sea lion.

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#9
In reply to #2

Re: Seal

08/03/2018 3:41 AM

Love it - Redfred.

In a compressor a wet seal is either a liquid ring seal or a mechanical seal or a combination of both. A dry seal would refer to a dry running gas seal. This seal is usually a dual seal in tandem arrangement provided with a face geometry designed to give lift off between the two faces of a few um and seals the process gas and then very often an inert gas such as nitrogen - a link is provided in this thread for these seals or just google "dry gas seals".

Judging by previous question on seals I assume the OP refers to pumps. Wet seals run on liquids - either the pumped product or the barrier/buffer fluid. Dry seals run on gas and are usually used as the outboard seal of a dual seal and run on nitrogen. The inboard seal would run on the pumped liquid. (See API plan 72, usually used with plan 75 or 76 in the link below).

I suggest that the OP should look at all the seal plans in this link as it will then become fairly clear (many other manufacturers have similar information on their sites, just google API seal plans to find more). If still in doubt, feel free to ask.

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#4

Re: Seal

08/02/2018 12:01 PM
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#11

Re: Seal

08/08/2018 8:08 AM

The nature of the wetting fluid, obviously.

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#12

Re: Seal

08/09/2018 10:00 PM

Someone has humorously highlight the difference between Wet and Dry, but to a certain extent, it is correct.

For pumps and compressors (more often to compressors), there is sealing device. Many types are available, but most popular one is mechanical seal. Mechanical seal surely needs lubrication and cooling as it always work with the friction.

When the mechanical seal is provided with Wet medium (usually oil or Demi-water) to form the lubrication firm and to cool the seal surface, then it is wet seal. While when the gas is provided for the same purpose, it is dry seal.

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#13

Re: Seal

05/17/2020 10:11 AM

Honestly, this is the first time I've heard of different sealing methods. Wet and dry, it is interesting to read the more detailed answer and consult with experts.

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#14
In reply to #13

Re: Seal

05/17/2020 11:58 AM

It all depends on the application. (My humorous application was aquatic mammals. The OP never provided an application so I had a little fun.)

The Prof provided one real, practical application of seals in a compressor.

Another real application I'm familiar with but am far from an expert is the seals used to obtain an Ultra High Vacuum (UHV) environment. A wet seal does an excellent job of preventing atmospheric infiltration at a moving or at the mating of highly irregular surfaces but always outgasses the wetting agent into the UHV space. A dry seal cannot be used at a moving surface but between reasonably smooth contact areas a malleable dry seal between harder surfaces can keep the atmosphere out with little to no out gassing.

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