The centrifugal pump has long been the pumping technology of choice in many fluid-transfer applications, ranging from oil and gas and chemical production to liquid terminals supplied by pipelines, barges, rail cars, and trucks. Their operation is well-suited for high-volume transfer applications because fluid enters the pump impeller along or near the rotating axis and is accelerated by the impeller, flowing radially outward into the volute discharge port. Centrifugal pumps also work well with water-like fluids that must be moved through piping networks with variable flow rates.
Still, in
fluid-handling operations that are critical to many industries, a different
technology — positive displacement twin and triple screw pumps — can be a more
versatile, reliable, and efficient alternative to centrifugal pumps. This
article demonstrates how effective screw pumps can be as a replacement for
centrifugal pumps.
A family of highly
efficient and versatile twin and triple screw pumps is designed to meet
the fluid handling requirements of the oil and gas production and supply
chains.
Differences
Between Centrifugal and Screw Pumps
Centrifugal pumps
utilize an impeller design that is great for high-transfer applications and
water-like fluids that need to be pumped through piping networks with variable
flow rates. With their engineering principles, it’s easy to understand why so
many operators depend on centrifugal pumps for a variety of common fluid
processing applications. Yet, we all know that different pumps are often better
for different jobs.
Screw pumps are
becoming increasingly popular in industries where standard centrifugal pumps
either do not provide the desired flow rates and energy efficiency, or they
have difficulty handling high-viscosity liquids and other materials that impede
performance capabilities.
Positive
displacement twin screw pumps and triple screw pumps have proven to be more
versatile and reliable for certain applications, particularly in industries
such as chemical processing, petrochemicals, and oil and gas, where viscosity
is frequently a problem for centrifugal pumps.
The Benefits
of Screw Pumps
Screw pumps have
several screws that engage with one another as they rotate to form a sealed
cavity within the pump casing. The fluid moves steadily and continuously
through the pump as the screw drives turn. It produces a volumetrically
consistent flow rate that is unaffected by pumping pressure or viscosity, which
would otherwise slow down a centrifugal pump.
Some screw
pump advantages include:
- Versatility with different flow rates, pressures, liquid types, and viscosities
- Constant flow rates
- High volumetric efficiency
- Controllable output
- Low internal velocities
- High tolerance for entrained gases or air
- Smooth and quiet operation
- Very low pulsation
- Self-priming characteristics
- Reduced mechanical vibration
Manufacturers
of the Best Screw Pumps
Risansi is one of the world's leading screw pump manufacturers. Because these screw pumps can be used for a wide range of
fluid applications, it is critical to select the correct pump for your specific
fluid transfer requirements.
Contact Risansi Industries today to learn more about the benefits of
screw pumps and to determine if one is a good fit for your industrial
operation. Allow us to assist you in selecting, installing, and maintaining the
best pump for the job!
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