Screw Pumps Show Their Strength

With almost thirty years and counting of uninterrupted service for its 60-inch and 72-inch screw pumps, operators at the City of Calhoun’s Wastewater Treatment Plant have firmly underlined the benefits of basic preventive maintenance.To get more news about Single Screw Pumps, you can visit hw-screwpump.com official website.

In 1988, Calhoun’s WWTP (permitted for 16 million gallons per day) first invested in two of Lakeside Equipment Corporation’s 60-inch, 75 horsepower open screw pumps (capacity of 7,000 gallons per minute), and two 72-inch, 50 horsepower screw pumps (capacity of 10,500 gallons per minute). Original concrete construction involved an empty space provided for a third pump for each capacity, which was filled in 2012 by a new 60-inch, 75 horsepower Lakeside screw pump with a lift of 20.46 feet at 38-degree incline.
A LOOK INSIDE THE WASTEWATER TREATMENT PLANT

A year later in 2013, one of the original 60-inch Lakeside pumps was finally replaced (followed a year later by another of the same diameter to replace the last, original 60-inch screw pump)—but even then, as John Banks, the City of Calhoun Wastewater Treatment Plant’s manager, explains, this was more to do with budgetary and long-term planning requirements.

“The pumps were only just beginning to wear out, but they were certainly not on their last legs,” he says, “far from it. The original 60-inch Lakeside Screw Pumps far exceeded their life expectancy.”

The average flow at Calhoun (one hour north of Atlanta), is around 5 million gallons per day (14 to 16 million gallons per day during rain events), serving the city of Calhoun, Georgia (home to some of the world’s top floor covering manufacturers). The treatment plant is a tough, corrosive environment for the original Open Screw Pumps (all Lakeside), that via three different configurations, run rotationally 24/7 to equal out wear.
SCREW PUMPS GET TO WORK

Consisting of a spiral screw, upper and lower bearings, and a drive arrangement, the open screw design uses a torque tube with spiral flights set in an open, inclined concrete trough. The screw pump’s basic design has been used for millennia to promote both simplicity and reliability.

John Banks (who has worked at the facility for twelve years) adds, “The beauty of the Lakeside screw pumps is that there is actually very little maintenance. Once per week we check oil levels and our operators will also monitor the grease levels on the bottom bearing. All very simple—and with Lakeside’s stainless steel tubing, we don’t have to worry about corrosion. These routine checks have seen our screw pumps work very reliably for twenty-five years-plus, which shows what a good investment they are.”

Normally, two of the Lakeside screw pumps at the influent of Calhoun’s WWTP lift the raw sewage up out of the collection system into the plant. Pre-screening is not required because large objects pass between the screw flights and through the screw pump.

BACK-UPS AT THE READY

Additional screw pumps are ready in the event of the sewer system becoming supercharged due to a large rain event. After lifting, the wastewater is taken through screening and grit removal processes before being lifted again by a second set of screw pumps.

John Banks continues, “Our program of rotating the use of the screw pumps, combined with basic oil checks and free-flowing grease has given us a winning hand of flexibility and very long-lasting equipment. This preventive maintenance program also means that we don’t have the pressure of having to get a screw pump back into service quickly if and when we are looking for additional pumping capacity.”

Three-Screw Pump Progressing Cavity Pump

The “Three-Screw Pump Progressing Cavity Pump Market” expresses deep insights into industry size, share and growth trends forecast by regions until 2023-2029 with top countries data. The report gives comprehensive description about SWOT analysis, PESTLE analysis and Porter’s Five Forces analysis. It also includes key player’s analysis with CAGR status, industry growth revenue and future expectation of industry. Three-Screw Pump Progressing Cavity Pump market report mainly covers industry segment details, business development and expansion strategies across all regions.To get more news about NETZSCH Pump Accessories, you can visit hw-screwpump.com official website.

The report focuses on the Three-Screw Pump Progressing Cavity Pump market size, segment size (mainly covering product type, application, and geography), competitor landscape, recent status, and development trends. Furthermore, the report provides detailed cost analysis, supply chain. Technological innovation and advancement will further optimize the performance of the product, making it more widely used in downstream applications. Moreover, Consumer behavior analysis and market dynamics (drivers, restraints, opportunities) provides crucial information for knowing the Three-Screw Pump Progressing Cavity Pump market.

The Research Report delivers knowledge about sales quality, sales value and different brands related to top market players with highest number of market tables and figures at a guaranteed best price. Additionally, it comes with exhaustive coverage of post pandemic forces that are likely to impact the Three-Screw Pump Progressing Cavity Pump Market growth. The overview of report contents includes market dynamics, market share information, analysis of smaller companies, investment plans, merger and acquisition, gross margin, demand supply, import-export, covering key market segmentation that includes by types, applications, end-user, and regions.

Chapter 1 provides an overview of Three-Screw Pump Progressing Cavity Pump market, containing global revenue and CAGR. The forecast and analysis of Three-Screw Pump Progressing Cavity Pump market by type, application, and region are also presented in this chapter.

Chapter 2 is about the market landscape and major players. It provides competitive situation and market concentration status along with the basic information of these players.

Chapter 3 introduces the industrial chain of Three-Screw Pump Progressing Cavity Pump. Industrial chain analysis, raw material (suppliers, price, supply and demand, market concentration rate) and downstream buyers are analyzed in this chapter.

Chapter 4 concentrates on manufacturing analysis, including cost structure analysis and process analysis, making up a comprehensive analysis of manufacturing cost.

Growing Applications for Screw Pumps

As complexity has grown in processes and new conditions have been added, screw pump technology has attracted increased interest from facility designers, process engineers and operators across the industry.To get more news about NETZSCH Pump Accessories, you can visit hw-screwpump.com official website.

The need to improve energy efficiency and operating flexibility while driving down operating costs is the main goal. It is time to revisit conventional approaches to pump selection and take a look at the evolution of screw pumps, determine how they could improve economics and safeguard the vitality of critical processes in process plants and transfer systems. This article focuses on pump types with multiple screws. All screw pumps are part of the positive displacement family and, as such, are designed to displace flow in direct proportion to the rotary speed of the pump. This runs contrary to hydrodynamic pumps, which rely on kinetic energy.

The tight cavities are formed when the profiles of the screws mesh as the pump rotates, thereby transporting fluids from suction to discharge as it builds up pressure to overcome the downstream back pressure from the system. The screws of the pump are the main pumping elements, where the driven screw or power rotor transfer the torque to one or several idler screws mechanically and hydraulically. The smooth opening and closing pump cavities result in a pump flow with low pulsations and airborne noise.
Most screw pumps are designed to eliminate axial hydraulic thrust either by using balance pistons or by having the screws in an opposed flowing arrangement. The absence of thrust bearings helps to simplify the pump design and eliminate potential wear and maintenance areas.

Applications
Most multiple-screw pump designs are self-priming and can work with low suction pressure. They are also gas tolerant and able to handle free and entrained gases without vapor locking. Low internal fluid velocity and the gentle meshing of the rotors also contribute to low shear rates, which is especially important for shear-sensitive, non-Newtonian fluids as well as different kinds of emulsions.

The operational flexibility of the multiple-screw pump is manifested by its ability to work over a large viscosity range, from light hydrocarbons to residues and emulsions. The screws are normally case hardened for improved wear resistance, and customized coatings are occasionally used to protect rotor bores, the rotor liner and pump casing.

Today’s family of screw pumps includes designs that were traditionally used in hydrocarbon processing. Applications are now increasingly found in the chemical, petrochemical, food and biofuel industries. Each pump design has its specific set of operational advantages and possibilities. Finding the right type of pump for specific applications is not only important for the process but also a cost optimization opportunity including the total cost of ownership.

Designs
Two-screw pumps without timing gears:

One pump design relies on two screws, one drive and one driven idler screw, which are radially supported by bushings and lubricated by the pumped fluid. The bushings are also part of the axial thrust balance configuration where discharge pressure on one side of the journal and suction pressure on the other side creates a pressure balance while providing liquid for lubrication and cooling.

The torque transfer from one screw to the other happens by means of a rolling (as opposed to sliding) contact over the screw profile, providing good wear resistance. These screws are running with radial clearance to the bores, which makes this pump design resistant to abrasive wear and suitable for fluids with low lubricity.

GEA Launches New Twin-screw Pumps for Hygienic Applications

The GEA Hilge Novatwin hygienic, stainless-steel twin-screw pump, part of the GEA Varipump line, is now available in six sizes. GEA says the pump can be used for pharmaceutical products including nutraceuticals, blood products, vaccines, enzymes, and cell cultures.To get more news about MONO pump Accessories, you can visit hw-screwpump.com official website.

Twin-screw pumps are positive displacement pumps and offer gentle conveyance of shear-sensitive and abrasive media; they can also pump liquids of different viscosities. The pumps can also be operated at high speeds for functioning as a clean-in-place (CIP) pump.

According to the press release, the self-priming GEA Hilge Novatwin enables safe operation with low pulsation and low noise levels at high product viscosities, temperatures up to 135 °C, and differential pressures up to 25 bar. The system pressure of 30 bar also allows the pump to be used in high-pressure applications. The pump handles both sensitive, viscous media at low speed and cleaning media in the CIP process at up to 3000 rpm.
Thanks to the High-Efficiency Unique Design (HEUD), a performance-optimized shape, NOTOS® multi screw pumps in industrial design offer smooth and gentle pumping with high performance at the same time. Precise tolerances and an optimized spindle profile ensure long service life and low life cycle costs. Since the pumps are hydraulically balanced, no axial forces act on the ball bearing. As a result, the bearings are subjected to much less stress, and the maintenance effort of the pump is significantly minimized. This saves money and time for you.

In addition to the well-known advantages, the hygienic design of the model is convincing in applications where an almost sterile atmosphere is necessary. This mainly includes the food, beverage, pharmaceutical and cosmetics industries. The model is made of stainless steel and polished according to international standards so that the pumped medium cannot adhere to it. This makes it particularly easy to clean. The pump is suitable for the CIP process (Cleaning-In-Place) and the SIP process (Sterilization-In-Place). In the CIP process, it functions as a transfer and cleaning pump at the same time. This means that you no longer need an additional cleaning pump. In addition, the model has been designed without dead space. Angles and corners that are difficult to reach have been avoided. Therefore, nothing hinders easy cleaning. The last significant advantage is the FSIP® concept (Full Service in Place) of the hygienic version. The concept enables full service and maintenance in the system. Thus, there are no time-consuming and cost-intensive downtimes for you.