Selection and Application of Pumps
- Fluid Properties
- End Use Requirements and
- Environmental Factors
- Acidity or Alkalinity (pH) and material chemical composition. As caustic and acidic fluids can degrade pumps through corrosion, the fluid chemistry must be considered when selecting pumps materials.
- Operating Temperature: - In cases where the pumped fluids may be hotter than 200 Father pump materials must be evaluated for expansion. Mechanical seal components and pump packing integrity.
- Solid Concentration/Particle Sizes: - Selecting a pump that will not clog or fail prematurely when pumping abrasive liquids such as industrial slurries needs to be evaluated. Principal factors include particle size and hardness, as well as the volumetric percentage of solids.
- Specific Gravity: - Specific gravity affects the energy necessary to raise and transport the fluid. It needs to be factored when formulating pump power requirements. The fluids specific gravity is the ratio of the fluid density to that of water under specified temperature and pressure conditions.
- Vapour Pressure: - Proper consideration of the fluids vapour pressure will assist to diminish the risk of caviation. Vapour pressure of fluid increases non-linearly with temperature.
- Viscosity: - Viscosity of a fluid is a measurement of its opposition to motion. High viscosity fluids results in decreased centrifugal pump performance and increased power requirements. Kinetic viscosity varies directly with temperature.