Treatment of Pulleys

Please describe the materials of construction of the pulleys and belts, and the nature of the atmospheres they are subjected to.

the material is cast iron or GG alloy steel and atmosphree is condenser room at high max. temp is 52° c.

Not being aware of the belt design I would recommend a light coating of of a petroleum base lubricant to physically treat the exterior of the pulleys. This is simply to deter corrosion. Paint, while longer lasting, therefore requiring less upkeep, can hide corrosion from inspection creating a hazard.

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Are these drive pulleys and belts used for power transmission or are they pulleys to move belts that transport the raw materials. Consider using lagged pulleys for drives and takeups with a good epoxy paint to protect the sides and taperlocks used for transport. Oil on power transmission belts is usually not preferred due to increased slippage. Many pulleys can be purchased with protective coverings. Greasing all main bearings regularly will help protect them and keep out corrosives. sealed bearings are even better as long as cleaning the exteriors is also performed. For transmission pulleys you can paint the areas not in contact with the drive belts.