CobaDGS – The next evolution of compressor seals

One plus one makes three.

The new CobaDGS combines the best of two worlds and raises the performance of high-pressure compressor seals to a new, first-class level.

Until now, manufacturers and operators of turbo-compressors have had to accept compromises when it came to choose the right mechanical seal:

Conventional double seals run emission-free when supplied with nitrogen but are only suitable for low pressure applications. They threaten to fail quickly if the N2 supply interrupts. Tandem seals can withstand very high pressures but emit large amounts of harmful process gas like methane or CO2 when vented or flared.

 

The CobaDGS is the first gas seal for turbo-compressors

  • that reliably prevents climate-damaging emissions,
  • copes easily with high operating pressures
  • and shows impressive performance without damage even when N2 supply is interrupted.

The CobaDGS is recommended as a sustainable sealing solution for retrofitting in all conventional turbo-compressors and as excellent first fit solution for original equipment manufacturers. A modification of the compressor is usually not necessary.

 

 

The CobaDGS strengths and highlights

 

The CobaDGS prevents any methane emissions and is therefore the most climate-friendly sealing solution for turbo compressors in the higher-pressure range. Its use contributes significantly to climate protection and is also an efficient alternative to hermetically sealed systems.

In the event of a failure of the nitrogen supply, the CobaDGS shows excellent emergency running characteristics even over days. A quick emergency stop of the compressor is not necessary.

Depending on the operating pressure, only up to 25% of the supply gas escapes in the direction of the process. The product quality remains high.

The CobaDGS can be used as an upgrade for existing single, tandem or double seals. The extremely compact design allows an additional backup seal if required, which further increases the reliability of the seal.

The CobaDGS is as safe in use as a tandem seal and can be operated reliably and emission-free up to 160 bar.

The supply of dry, clean sealing gas eliminates the need to discharge process gas into the atmosphere, which is common with tandem seals. There is no loss of process gas, which improves the operating result.

 

 

The CobaDGS fits almost in any compressor – even in one with smaller seal cavities

Whether in turbo-compressors with gas turbine, steam turbine or electric drive – the CobaDGS fits in without any problems.

Due to its very compact size, this innovative seal can also be used in compressors with smaller seal cavities, for example to improve rotor dynamics.

 

 

Application examples and the advantages

 

Double seal
with N2 supply
Single CobaDGS Tandem CobaDGS

The single CobaDGS acts like a conventional double seal but provides greater safety.

CobaDGS added value

  • The seal can withstand a temporary failure of the N2 supply without damage thanks to excellent emergency running properties with process gas – no emergency stop required
  • Easy-to-Upgrade solution – existing connections and N2 supply can be used
  • Significantly smaller – fits into existing cavity

     

Typical applications

  • All applications where double seals are used such as wet-gas compressors

The tandem CobaDGS acts like a conventional double seal but provides much greater safety.

CobaDGS added value

  • Significantly safer due to additional backup seal without exceeding typical seal cavity
  • The seal can withstand a temporary failure of the N2 supply without damage thanks to excellent emergency running properties with process gas – no emergency stop required
  • Easy-to-Upgrade solution – Modification of connections usually not necessary; existing N2 supply can be used

Typical applications

  • All applications where double seals are used such as wet-gas compressors

 

Tandem seal
without N2 supply
Tandem CobaDGS Tandem CobaDGS with CobaSeal

The tandem CobaDGS offers the same safety as a conventional tandem seal but is much more robust and operates completely emission-free.
 

CobaDGS added value

  • Zero Emission – no process gas emissions (e.g. methane)
  • N2 keeps the seal clean and makes it extremely robust
  • No problems due to contaminated process gas
  • Easy-to-Upgrade solution – modification of connections usually not necessary
  • Booster not required

Typical applications

  • Pipeline compressors
  • Makes conventional compressors a cost-saving option to hermetically sealed compressors
  • Alternative to leakage recovery system

Our recommendation. The seperation seal CobaSeal is currently the best solution for oil sealing on the market with lower N2 consumption than any other system.

CobaDGS-CobaSeal added value

  • Highly safe due to excellent emergency running properties
  • Zero process gas leakage into the bearing in the event of damage
  • Best protection of CobaDGS against contamination with bearing oil
  • Highly efficient – significantly reduced N2 or air demand

 

The CobaSeal shows its full strength also in combination with all other variants. This is only one possibility.

 

Tandem seal
with N2 supply
Wet seal
Tandem-CobaDGS Tandem-CobaDGS

The tandem CobaDGS offers the same safety as a conventional tandem seal but is much more robust.
 

CobaDGS added value

  • Zero Emission – no process gas emissions (e.g. CO2 from flared gas)
  • N2 keeps the seal clean and makes it extremely robust
  • No problems due to contaminated process gas
  • Booster not required
     

Typical applications

  • All applications where tandem seals with N2 supply are used

The CobaDGS is currently the most advanced seal. It makes your retrofit investment an economically and ecologically convincing solution for many years to come.

CobaDGS added value

  • Zero Emission – the leakage of the wet seal is not only reduced but eliminated
  • Significantly reduced operating costs
  • N2 keeps the seal clean and makes it extremely robust
  • No problems due to contaminated process gas
  • Excellent emergency running properties

Typical applications

  • Upgrade of wet seal compressors

 

Technical details and expert advice

No two applications are the same. We are happy to go into detail with you and discuss the possibilities of using CobaDGS for your specific application.

You can find more details on the technical data such as application area, materials, standards and approvals here.

Contact us
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We are happy to advise you

Would you like personal advice, do you have any questions or would you like to order directly? We look forward to supporting you.

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The perfect fit: Separation seal CobaSeal

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Solution: Seal upgrade with CobaDGS

In a production plant for propylene, the gas-lubricated CobaDGS proved to be the perfect retrofit solution for an oil-lubricated compressor seal. Everyone involved was impressed by a special seal feature that became apparent.

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