Page 263 - The Tribology Handbook

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B20 Sealing against dirt and dust

Table 20.4 Sealing with limited rotary or axial movement

Method Description Comments
Elastomeric deflection Annular elastomer bushes either single or Very high level of reliability in all
multi-layered, bonded or fastened to the environments at low cost. Elastomer
adjacent parts. must be matched to local contaminants.
All motion either torsional or axial must
occur in the elastomer. Usually, bushes
made specially to suit load requirements

RECIPROCATING ENGINE BREATHING

AIR FLOW, ftYrnin
0 500 KXK) I500 2000 Dust concentration up to 0.0015 kg/m3.
/I Type of cleaner: 2-stage, primary centrifuge with fabric
1 1 1 1 0 1 1 I l I l I I I l I
secondary stage.
Fabric required for 2nd stage:
0.1 m2 X 150 mm thick/37 kW.
Approx. relationship between air flow and bulk volume of
complete cleaner shown in Figure 20.3.

AIR FLOW, m3/s

Figure 20.3 Air cleaner requirements for recipro-
cating engine breathing; 20- 100 h maintenance
periods for max. dust concentration of 0.0015 kg/
m3, restriction 15-25 in w.g.

B20.4