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Which Is Best for the Job? Positive Displacement vs. Centrifugal Pumps

Choosing the right type of pump for your fluid and air flow needs is an important decision. It requires knowing the difference between centrifugal and positive displacement pumps and how they impact your application.

Centrifugal pumps are the most popular type of pump in the world. They are effective, robust, and relatively easy to use. Positive displacement pumps are commonly utilized in high pressure hydraulic systems.

Basic Comparison

There are several key differences in the way these two types of pumps function and operate.

The mechanical component of centrifugal pumps imparts velocity to the liquid, resulting in a pressure at the outlet. The pressure changes as flow varies, which drives performance. Efficiency decreases as viscosity increases due to frictional losses inside the pump.

On the other hand, positive displacement pumps capture a confined amount of liquid and transfer it from the suction to the discharge port. Flow remains constant under changing pressure.

Applications

Their individual qualities make each type of pump ideal for separate uses.

Centrifugal pump applications include air conditioning, boiler feed, irrigation, light fuel transfer, petrochemical, sea water transfer, water circulation, and general water supply.

Positive displacement pump applications include fuel, dewatering, lubrication oils, waste oils, hydraulics, and mediums containing high levels of solids.

The Pump Experts

Glauber Equipment Corporation will provide answers to any of your fluid and air flow questions. Our staff of highly trained engineers and mechanics offers efficient on-site and depot evaluation and repair services.

Contact our experts today to find your next fluid and air flow solution.

To read more about an optimal pump configuration for your next fluid or air flow solution…

Download our newest eBook, Positive Displacement vs. Centrifugal Pumps: The Key Differences

 

 

 

 

Take a Look at Our Renewable Natural Gas Skid Systems

Renewable Natural Gas (RNG) is a type of biogas obtained from the decomposition of organic matter. The primary sources of RNG include landfills, animal waste, and solid waste recovered from wastewater treatment processes. Once captured, the gas is processed to remove unwanted components such as carbon dioxide, hydrogen sulfide, and water.

Raw extracted RNG must undergo several processes before it can be sold to the consumer. The equipment necessary for processing RNG is typically contained in structural frame systems known as skids. These skids can include individual or multiple processes depending on the needs of the consumer; Regardless, it is essential to custom-design each skid to suit a facility’s unique processing and spatial requirements.

Glauber Equipment Corporation, Inc. offers a variety of custom skid solutions that can be incorporated into various production systems for complete RNG processing.

Feed Blower/Dehydration

The feed blower is one of the first components in a renewable natural gas processing system. Through the use of centrifugal or positive displacement Compressors, systems increase the pressure of the gas for further processing and compression.

Feed blower skids are almost always combined with dehydration skids for the removal of potentially damaging moisture from feedstock RNG.

Vacuum Blower

Vacuum blowers are used in the CO2/methane membrane separation process. During renewable natural gas processing, CO2 must be removed from the feedstock to ensure the gas meets industry-specific requirements. The vacuum blower creates a negative pressure on the suction side and assists in the separation of CO2 through the membrane using the principle of selective permeation. Vacuum blowers and feed blowers are frequently used together and are usually integrated into a single skid.

Feed Gas Compressor

For separation of CO2 from the desired methane gas, the mixture must be compressed and processed through a series of selective membranes. To address this, a feed gas compressor skid uses rotary vane or screw mechanisms to “squeeze” the gas and create a buildup of pressure on the positive-pressure side of the membrane system. These skids may also consist of a knockout/moisture separator to protect the compressor and downstream equipment from corrosion and other moisture-related deterioration. Depending on the size of the compressor, pressure increases up to 350 psig may be achieved.

Sales Gas Compressor

The sales gas compression is the final stage of renewable natural gas processing. Here, the dry and purified “sales” gas is compressed to enable transportation through utility piping networks. Typically, reciprocating or screw mechanisms are used to compress the gas to the high pressures required at this stage.

Partnering with Glauber Equipment

Glauber Equipment Corporation, Inc. is committed to fabricating custom skid solutions that fit your unique RNG processing needs. Our team of experienced and certified field technicians also provide onsite maintenance and repair services to ensure that your skid systems always function at optimal capacity.

to learn more about our skid systems and determine which components are best suited for your application, Download our free RNG Skid Systems Overview eBook here!

Feel free to Contact Us here to see how we can help you with your specific applications.

A Great Turnout at the 2018 Wilden Pump Training Event

At Glauber, we’re always excited when we have the opportunity to share industry expertise with our customers. To that end, we hosted our 2018 Wilden Pump Training—led by…

  • Tom Zuckett: Wilden’s Northeast Regional Manager
  • John Wallace: Sales Director – US & Canada.

The event had a great turnout, with more than 25 customers participating in the training session. Tom and John provided the group with an in-depth overview of Wilden pumps, complete with a demonstration of some of the leading products.

What Was Discussed

This year’s training session focused primarily on Wilden’s air operated double diaphragm (AODD) pumps, with ProFlo Shift Technology. These pumps feature a specialized patented design that incorporates the latest innovative technology to maximize the pump’s efficiency. Wilden’s AODD pumps, with ProFlo Shift Technology, increase overall productivity, reduce air and energy consumption, and require significantly less maintenance than many other AODD pump types.

During the training session, the group discussed a wide range of topics related to the AODD pumps, including:

Wilden AODD Pro-Flo®

  • How AODD pumps work
  • How AODD air motors work
  • Best maintenance practices
  • Best installation practices
  • Best operational practices
  • Troubleshooting and repair tips

Demonstration

After going over the main operational features of AODD pumps, John Wallace led the group in a demonstration of the two-inch Wilden pump, featuring Wilden’s ProFlo SHIFT technology. The exercise helped show customers how much Wilden’s ProFlo SHIFT technology can make a difference when it comes to energy savings––giving companies a huge advantage over competitors who may be using less efficient pumps

During this portion of the event, John demonstrated both the two-inch Wilden pump and a competing two-inch pump under the same system conditions – a flow rate of 80 gallons per minute; system head pressure of 15 psi; and the same pressure gauges, fluid flow meter, and air flow meter – to see how they’d perform against one another.

Results

In the end, the results spoke for themselves—successfully showing how the Wilden pump outperforms the leading competing pump in energy savings. The demonstration revealed that the competitor’s pump consumed 39% more standard cubic feet per minute (SCFM) of air than the Wilden pump. Wilden consumed 32 SCFM of air while the competing pump consumed 52 SCFM of air.

The competing pump also exhibited 42% more strokes per minute (s/m) with 198 s/m compared to Wilden’s 116 s/m. Together, these results demonstrated the value of Wilden’s SHIFT technology and how it gives customers an edge over their competitors.

Overall the training was a great success, allowing customers to see firsthand how Wilden’s technology can save them valuable time and money. We enjoyed hosting all of our wonderful participants this year, and we hope to see them again soon at a future event. We also are very grateful to Tom Zuckett and John Wallace for sharing their expertise.

At Glauber Equipment Corporation, we strongly believe in sharing our knowledge and expertise with our industry partners to help one another succeed. Since 1960, we have been a trusted name in providing high-quality

blowers, compressors, and pump systems across upstate and western New York, and we offer a variety of education and training services.

So, if your organization would be interested in a lunch-and-learn session or a basic equipment training, please contact us to learn how we can help. We’d be more than happy to come to your facility and provide a training session for your staff.