Page 430 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Lube, Seal and Control Oil System Best Practices Best Practice 7 .15

Fig 7.15.10 Filter sizing nomograph
(Courtesy of Filterrite)

A sizing exercise for our example is performed below for (Refer to Figure 7.15.10)
a depth type filter. A sizing chart is shown in Figure 7.15.10. At 60 SSU, 3 psi Dp for 10 micron ‘Orlon’ cartridges, flow
Note that the sizing must include considerations for the high rate ¼ 3.1 GPM/cartridge
viscosity (1,000 SSU). 60 GPM
Number of cartridges required ¼
3:1 GPM=1 Cartridge
Depth type filter sizing example
¼ 19:5 ¼ 20 Cartridges
Given:
2. Pressure drop @ 500 SSU operation (refer to dotted lines in
- Light turbine oil
- Normal viscosity ¼ 60 SSU @ 150 F Figure 7.15.10) at 500 SSU, 3.1 GPM/Cartridge Dp

- Max viscosity ¼ 500 SSU @ 55 F exceeds 20 psi.

- Oil flow ¼ 60 GPM In the above example, to limit the filter Dp to 20 psi at 500
- Filtration required ¼ 10 Microns SSU, a 2 GPM cartridge would have to have been selected. In
- Filter material ¼ Orlon this case, the number of cartridges used would be:
- Clean pressure drop ¼ 3 psi
Determine: Number of cartridges ¼ 60 GPM
2 GPM=Cartridge
- Number of filter cartridges required ¼ 30
- Pressure drop @ 500 SSU operation
1. Determine number of cartridges

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