There are numerous factors affecting wear, i.e. the amount and speed at which material erodes: The properties of the bulk material (e.g. grain size and sharpness, moisture content, and chemical aggressiveness), operating conditions such as the flow rate, throughput, or drop height, and the type of material, as well as the constructive design of the plant components.
Abrasive wear in industrial plants can be found in particular wherever bulk materials are produced, transported, treated, processed, and stored. During transport, treatment, and processing, the plant components can also be exposed to corrosive stresses due to moisture and aggressive media.
TYPES OF WEAR
- Abrasive wear (also referred to as sliding wear or grinding wear): the scratching effect of the sliding or flowing material parallel to the component surface.
- Impact wear: the material being conveyed strikes a surface due to gravitational or centrifugal force and removes material from the component (also referred to as percussive wear)
- Wear due to mechanical abrasion and corrosion: permanent erosion of the component material can lead to a steady reduction of the wall thickness of a component.
FACTORS AFFECTING WEAR: MATERIAL – CONSTRUCTIVE DESIGN – OPERATING CONDITIONS
Since the properties of the bulk materials cannot be influenced, wear can be reduced primarily by altering the factors “material”, “constructive design” and “operating conditions”.
The operating conditions are often specified by the customer and should be realistically optimised during the planning stage of a new plant.
Since wear and corrosion always affect the component surface, the following two properties are examined during the constructive design of the plant component:
- The material’s mechanical properties in terms of the absorption of static, dynamic, and thermal stresses
- The surface properties of the material with respect to counteracting abrasion and corrosion