Applications
19
Tsubaki ACS 19152W
Tsubaki ACR 810
10
Malleable Cast Iron Chain
0
0
5
10
Time (Years)
Figure 6.28 Comparison of Cast Iron and Stainless Steel Sewage Treatment Chain
Sprockets Use special sprockets. Refer to the manufacturer’s catalog.
When cast iron chain was used, cast iron sprockets were also required. Due to corrosion, the area of the sprocket tooth engaging with the chain would lose its original form and round off (Figure 6.29). Upon engagement with the chain, additional stresses would appear that would accelerate wear on the chain and the sprocket even further. As a result, the working life of cast iron chains and sprockets was short. In an ideal situation, stainless steel sprockets are used with stainless steel chain to ensure the optimum performance. Cast iron sprockets will wear in a similar fashion even if stainless steel chain is used, resulting in increased wear on the chain bushings and shortened chain life. It is a basic point that you must use stainless steel chain and sprockets together. However, stainless steel sprockets are expensive. Chain manufacturers have designed the insert-tooth sprocket to reduce the cost. Only the part of the tooth that engages the chain is stainless steel; the sprocket body is carbon steel (Figure 6.30).
Sprocket Rounding Due to Corrosion
Tooth Insert
Insulator
Sprocket Body
Figure 6.29 Rounding of Cast Iron Sprocket
Figure 6.30 Insert-Tooth Sprocket
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