2 replies to this topic

[Tunnel]

Sir,

I am working on dry seal gas for a centrifugal compressor. I want to find out how to determine the amount of dry seal gas for the compressor's shaft.In this case, a treated fuel gas is used as the seal gas.

Thank you.

[fallah]

Tunnel,

As far as i know, the "dry gas seal" consumption rate is to be determined based on lost gas due to the seal leakage. The leakage rate through each seal is typically in the order of 8-16 Nm3/hr.

[ankur2061]

Tunnel,

I happen to have some knowledge on dry gas seals for centrifugal compressors having to work on a project where there were seal failures for a hydrogen recycle gas compressor in a refinery. For this particular compressor the seal gas (process gas) flow rate was 1.7 m3/h (1 ACFM) with the seal vent connected to flare.

Having said that, I also understand that this information is specific to the design of the compressor and the seal type (labyrinth or floating ring). I would consider it to be a waste of time trying to figure out the seal gas flow rate when such information could be requested and obtained from the compressor / seal OEM (Original Equipment Manufacturer).

Two of the leading dry gas seal manufacturers for compressors are John Crane (in fact they are credited for inventing the dry gas seal) and Burgmann. Most commercial seals today are made available as off-the-shelf items with item code / part numbers. In case you need to select a dry gas seal the correct and easiest option would be to approach these vendors and ask for their guidance / recommendation for the seal type and the seal gas system including the seal gas conditioning system. I had provided a blog entry on compressor dry gas seal system with particular focus on the seal gas conditioning system and an attached excel file depicting the seal gas system wihere the flow rate shown is for the example I have mentioned above. The blog entry can be found at the link below:

http://www.cheresour...r-seal-systems/

Hope this helps.

Regards,
Ankur.