Pump Sizing Guide Recommendations

• Capacity - The desired rate of flow in gallons per minute (GPM)
• Differential Pressure - The difference between the pressure required at the pump discharge and the pressure being supplied at the pump suction in pounds per square inch (PSI).
• Temperature - Maximum temperature at which the product is to be pumped in Fahrenheit ° F.
• Specific Gravity - Ratio of the density of the product-to-water at the pumping temperature.
• Abrasion - Wear characteristics of the product based upon careful judgment of the abrasive nature of the solids in the product. The following broad classifications will serve as a base guideline:
  None - Example: Clear Water
  Light - Example: Dirty Water
  Medium - Example: Clay slurries, Gypsum slurries, etc.
  Heavy - Example: Heavy Slurries, Lapping Compounds, etc.

Pressure

• Increasing differential pressure increases pump slip
• Higher Pressures require additional stator/rotor stages
• Higher pressures and slip have an accelerating effect on the rate of abrasive wear

Temperature

• Higher temperatures affect the choice of elastomeric materials
• Higher temperatures require the use of undersize rotors

Viscosity

• As viscosity increases, the pump slip will decrease
• As viscosity increases, the maximum allowable speed decreases
• As viscosity increases, the maximum allowable pressure per stator/rotor stage increases

Concentration of Solids

• Mixed liquids and microscopic solids usually produce a non-Neutonian liquid
• Many products exhibit their viscosity characteristics by virtue of a high volumetric content of finely divided solids in suspension, e.g., toothpaste, paper-coating mixes, etc.
• Higher solids in suspension content decreases maximum allowable speed and pressure per stage

Size of Solids

• Soft solids (abrasive) reduces the maximum allowable pump speeds
• Pumps must have sufficient cavity size to pass the largest hard particle in the product

• The more abrasive the product, the lower the pump must operate
• Amount of wear on an abrasive application is closely proportional to the speed squared

When contacting your Liberty Process Equipment representative with your pumping requirements, we appreciate if you already have a pump in operation to have the following information as well. Although it is not required, it will help us to identify the best possible solution(s) for your pumping requirements.

Not Required, But Helpful Information

• Model of Current Progressive Cavity Pump
• Serial Number of current Progressive Cavity Pump
• MSDS of current medium that is being pumped

Liberty Process Equipment is here as a solution for your pumping needs, once we have the information we require we will be pleased to provide you with a quote for a pump.