Chemical pumps are designed to endure a broad range of abrasiveness in various substances. Some chemical pumps can also be used as metering pumps, enabling regulated chemical flow and measurement.
A good pump can increase process safety and reliability. It can also save maintenance costs. So, how do you choose the best pump for chemical handling? Here are a few of the most crucial considerations.
Understand the chemical properties
Evaluate the particular substances at play first. Know the chemical’s temperature, viscosity, and corrosiveness. These characteristics will help you choose the right pump type and materials.
For instance, acids call for non-corrosive pump materials. On the other hand, high-viscosity fluids require a pump with good suction power and flow rate.
Decide on the right pump type
Pumpbiz has various types of pumps for chemical processing. Each is appropriate for a specific task. Let us discuss them below:
Diaphragm pumps
These are frequently employed in the treatment of volatile and hazardous compounds. The best thing about pumps with diaphragm-based designs is that they run well without leaks. They can handle varying temperatures and chemical viscosities.
Positive displacement (PD) pumps
These are typically the most effective for thick abrasive fluids. They also work well with shear-sensitive substances. Positive displacement pumps work well in applications where accurate fluid management is essential. They offer a steady flow rate.
Centrifugal pumps
These are perfect for continuous, high-flow applications. They also work well with low-viscosity fluids. However, they might not be appropriate for highly abrasive or viscous substances.
Rotary pumps
A wide variety of rotary pumps are employed in chemical applications. This includes gear pumps and piston pumps. Rotary pumps can more effectively handle high-viscosity fluids and low vapor pressure than centrifugal pumps.
Regenerative turbine pumps
These pumps use turbine-like impellers with teeth orientated radially to transfer chemical fluids. They are also called vortex or peripheral pumps.
Choose the right materials
Choosing the right materials is another crucial thing when selecting a chemical pump. Key internal parts, seals, and pump housings must be compatible with the chemicals.
Pump materials fall into two main categories: metallic and non-metallic. Ferrous and nonferrous metal pumps are further subcategories.
Ensuring these materials are compatible with the chemicals being pumped is essential to avoid leaks or degradation.
Pump performance and sizing details
Choosing the right pump size and performance requirements is another crucial factor when defining a chemical pump. Here are the most crucial performance or size requirements:
- Media temperature
- Maximum discharge flow
- Maximum discharge pressure (head)
- Discharge size
- Intake size
Using slightly oversized pumps is common. However, a massively oversized pump will have several problems:
- Excessive vibrations
- Increased operating temperatures
- Cavitation problems
- Early bearing failures
- Significant running expenses
An improperly sized pump may have issues with its fluid transfer system, so it’s best to size it accordingly.
The takeaway
It’s important to choose the right pump for chemical processing applications. It is advisable to engage a pump specialist. They will take the time to comprehend your unique chemical processing difficulties and pair you with the ideal pump for the task.
