Externally Pressurized Porous (EPP) Gas Bearings for Rotating Equipment...

                                     ....using PROVEN Porous Media Gas Bearing Technology

Radial and Thrust Bearings

Radial Bearings

Externally-Pressurized Gas Tilting Pad (or sleeve) Bearings enable non-contact, oil-free operation. These externally pressurized air bearings employ the same mounts as current hydrodynamic oil-based bearings (not compliant foils or flexures), so that high stiffness and damping can be maintained with an easy path to retrofit.  A variety of input gases in addition to air can be used – including process gas.  Bently BearingsTM externally-pressurized radial gas bearings can applied using a 3, 4 or 5-pad arrangement, depending on various design inputs. 

Thrust Bearings

Bently BearingsTM thrust bearings can be used in place of conventional tilt-pad, hydrodynamic, oil-lubricated thrust bearings. Thrust features can be incorporated into balance pistons.  Also, thrust bearings can also employ a sealing functionality, greatly simplifying sealing of compressors, pumps, and other turbomachinery.

Key Technology Benefits

  • No wear (frictionless)
  • No dry running at start-up; eliminates no-start potential
  • Requires similar real estate as conventional bearings and seals – retrofit applications possible
  • Familiar mounting geometries
  • Lower maintenance than oil bearings
  • Can serve as bearing and seal in certain situations
  • Less complexity than magnetic bearings
  • Does not require back-up bearings as magnetic bearings do
  • Long life
  • High speeds without heat
  • Adjustable damping
  • Low gas consumption
  • Potential to run on process gas
  • Less ancillary support equipment compared to conventional bearings and seals

Bently Externally-Pressurized Porous gas bearings can be used in a variety of applications

 

 

 

Comparison of Bently Externally-Pressurized Porous (EPP) Gas Bearings

with Other technologies

 

 

 

Ext Pressurized

Gas Bearing

Technology

Mag  Bearing

Technology

Oil

Bearings

Oil-free operation

Yes

Yes

No

Operable in process gas stream in bearing gap

Yes

Yes/No

No

Anticipate operability on steam in the bearing gap

Yes

No

No

Wear

None

None

Yes

Bearing contact at zero rpm

No

No

Yes

Control system needed

None or minimal

Yes

Yes

Back-up bearings needed

No

Yes

No

Overall  turbo equipment system footprint, compared  to when using hydrodynamic bearings

Less

Less

NA

Cost compared to hydrodynamic bearings

Similar

Higher

NA

Damping and stiffness, compared to hydrodynamic bearings

Similar-done by controlling gaps

Controlled

electronically

NA

Complexity compared to oil bearings

Simpler

More complex

NA

Physical size of bearings, compared to oil brgs

Similar

Larger

NA

Compatibility for retrofitting into existing turbo equip

Compatible

Not always compat

NA

Load carrying capacity compared to oil bearings

400 psi*

70-80 psi

>200 psi

Can function as bearing and seal simultaneously

Yes

No

No

 

 

 

 

Rating of Bearing Types vs. Performance Characteristics

Source: Turbomachinery International Nov/Dec 2014 Article "Get Your Bearings Straight"
 

Ranking Key:   3=Superior Rating    2=Average Rating    1=Low Rating

 

 

 

Oil Bearing

 

Magnetic Bearing

 

Foil Bearing

Flexture/Pivot Hybrid-Type Bearing

Externally-Pressurized Gas Bearing

Zero Friction at Start

1

3

1

2

3

Service Cost

1

1

3

3

3

Heat Generation

1

1

3

3

3

Process Compatibility

1

2

3

3

3

Shear/Speed

2

3

3

3

3

Load

3

2

1

2

3

Damping

3

3

1

1

3

Total Score

12

15

15

17

21


 

 

 

Bently Pressurized BearingsTM     Ph. (888) 891-5510      Inquiries@BentlyBearings.com

 

PATENTED TECHNOLOGY

Bently Pressurized Bearings is owned by New Way Air Bearings®

Print Print | Sitemap
© 2017 New Way Air Bearings