GGB HPMB self-lubricating hydropower bearings are ideal for turbine applications

GGB HPMB Cylindrical bushes

HPMB® High Precision Fiber Reinforced Composite Bearing

CHARACTERISTICS

  • Machinable inner and outer diameters for superior application precision, circularity and cylindricity tolerances
  • Pre-machined high precision HPMB bearings available for immediate installation
  • High precision through easy single point machining of the bearing liner, on-site prior to installation
  • Superior precision achieved with post-installation (inner diameter tolerance IT7 attainable) single point machining of the bearing liner
  • High load capacity
  • Excellent shock and edge loading capacity
  • Low friction with negligible stick-slip
  • Low wear rate for extended bearing life
  • Excellent corrosion resistance
  • Dimensionally stable - very low water absorption, low swelling
  • Environmentally friendly grease-free operation 

availability

Bearing forms made to order: finished cylindrical bushings, pre-machined cylindrical bushings, flanged cylindrical bushings (subject to design review)

 STRUCTURE AND COMPOSITION

Fiber and Epoxy Resin Composite Material 

Machinable liner composed of continuously wound PTFE and high-strength self-lubricating fibers and high temperature epoxy resin + continuous wound fiberglass backing encapsulated in a high temperature epoxy resin

MICROSECTION

 

GGB HPMB self-lubricating hydropower bearings microsection

 

Liner

• Fillers

 

Backing

 

 

Operating Performance
Dry Very Good
Oil lubricated Fair
Grease lubricated Not Recommended
Water lubricated

Very Good

Process fluid lubricated To be tested by final user

 

For superior performance
Oil lubricated GAR-FIL / HPF
Grease lubricated DX / DX10
Process fluid lubricated GAR-FIL / HPF

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

N/mm2

N/mm2

210

140

Operating temperature

Min

Max

°C

°C

- 196

163

Coefficient of linear thermal expansion

Normal to the surface 10-6/K 12.6
DRY      
Maximum sliding speed, U   m/s

0.13

Maximum pU factor  

N/mm2 x m/s

1.23

Coefficient of friction   μ

0.03 - 0.12 *

RECOMMENDATIONS      

Shaft surface roughness, Ra

 

µm

0.2 - 0.8

Shaft surface hardness

Normal

For longer service

HB

HB

> 180

> 480

* Depending on operating conditions

 STRUCTURE AND COMPOSITION

Fiber and Epoxy Resin Composite Material 

Machinable liner composed of continuously wound PTFE and high-strength self-lubricating fibers and high temperature epoxy resin + continuous wound fiberglass backing encapsulated in a high temperature epoxy resin

MICROSECTION

 
GGB HPMB self-lubricating hydropower bearings microsection

 

Liner

• Fillers

 

Backing

 

 

OPERATING PERFORMANCE
Dry Very Good
Oil lubricated Fair
Grease lubricated Not Recommended
Water lubricated

Very Good

Process fluid lubricated To be tested by final user

 

FOR SUPERIOR PERFORMANCE
Oil lubricated GAR-FIL / HPF
Grease lubricated DX / DX10
Process fluid lubricated GAR-FIL / HPF

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

psi

psi

30 000

20 000

Operating temperature

Min

Max

°F

°F

- 320

325

Coefficient of linear thermal expansion Normal to the surface 10-6/F 7.0
DRY      
Maximum sliding speed, U   fpm

25

Maximum pU factor

 

psi x fpm

35 000

Coefficient of friction    

0.03 - 0.12 *

 

RECOMMENDATIONS      
Shaft surface roughness

 

µin

8 - 32

Shaft surface hardness

Normal

For longer service life

HB

HB

> 180

> 480

* Depending on operating conditions 

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