SKF P203 - Influencing Factors on the Delivery Rate; Delivery Rate Charts for Typical NLGI 2 Lubricants

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4.3.1 Influencing factors on the delivery rate
Table
10
Influencing factors on the delivery rate
Influencing factors
Increasing the delivery rate
Reducing the delivery rate
Ambient temperature
> + 20 °C
< + 20 °C
Consistency class of the lubricating grease
< NLGI 2
N/A
Number of pump elements
N/A
> 1
Back pressure at the pump element
< 100 bar
> 100 bar
4.3.2 Delivery rate charts for typical NLGI 2 lubricants
Fig.
9
Delivery rate chart for low-temperature grease
Fig.
10
Delivery rate chart for high-temperature grease
NOTE
The values specified in the delivery rate charts represent the average value between different high-temperature and low-
temperature greases. The values could therefore vary with the lubrication grease actually used in the pump. This may
need to be borne in mind when designing the lubrication system.
Calculation of temperature-dependent delivery rate, using a high-temperature grease as an example
 =  ×  × 
OUT
Calculated delivery rate per pump element (ccm/min)
RPM
Nominal speed of the pump (in this example: RPM = 20 rpm)
V
Nominal delivery rate per pump element (in this example: V = 0.22 ccm/stroke)
E
Efficiency as a percentage (in this example: E = 80%) at a temperature of T = -10 °C)
 = 20
1

× 0,22 ccm × 80 % = 3,5

