Ever wonder how a piece of metal gets turned into a precision Cornell Pump shaft? This video vignette shown on our Pump School tours, gives a glimpse of how the shafts are made. If you attend Pump School 2017 you can see the shaft cell, assembly area, paint booth, test lab, and much more on the factory tour, plus get 1.5 days of engaging classroom instruction. Pump School 2017 is set for January 24 and 25, 2017 . Learn more about Pump School.
Centrifugal Pump Curve Classifications
There are four basic types of pump curve shapes that you will usually find for centrifugal pumps:
- Gradually rising – the most common type
- Steep – probably the second most common type
- Flat
- Drooping
Let’s talk about the pros and cons of each of these.
If you start on the right side (maximum capacity) of a gradually rising pump curve, you will have a nice arched shape, and head (pressure) increases continually as capacity is decreased, and you move to zero flow. This pump will provide a medium change of head (pressure) as the flow increases or decreases, and pump operation is very “stable” as the flow and head relationship are well defined throughout the pump curve. This type of performance is usually preferred, as it usually is very compatible to most sensing/control accessories that may be used to control the pump.
With a steep centrifugal pump curve, you will have a steeper arch, resulting in a larger head (pressure) increase as the flow decreases, compared to the gradually rising curve mentioned above. This performance may be desired with some sensing/control equipment where a larger pressure differential is preferred, and with system requirements that have large pressure demands with fairly small flow changes. The stability of this curve is excellent due to the steeper continuously rising shape.
An operator may prefer a fairly flat pump curve in some systems, where he/she would like very little pressure increase as the pump flow decreases. In addition, the operator/designer would not need to be concerned about building large pressure levels as the flow varied, and could possibly use lower pressure rated piping and accessories. The pump stability of this curve is good.
The fourth pump curve type is a drooping curve. As shown in the illustration, this curve shape is not stable in the area where there are two flows where the head (pressure) can be the same, in the low flow portion of the pump curve. This pump should be operated in flow ranges beyond (higher) than the area of instability in order for it to operate smoothly and efficiently. This pump would operate with a narrower acceptable flow range for that reason.
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f you have any questions regarding proper selection of your Cornell Pump, please contact any one of our technical salesmen for assistance.
Kindle Fire Winner at RETA Show
Eric Rice of Industrial Refrigeration Services in Visalia, CA is the proud winner of Cornell Pump’s Kindle Fire Raffle at RETA 2016. Congratulations Eric! If you didn’t happen to attend RETA this year, you can still learn about Cornell Pump’s Arctic King series.
Prominently featured at the show, the Arctic King offers operation at 1,200/1800 RPM –at least half the speed of other hermetic refrigeration pumps. This allows for better NPSHr, less required refrigerant, and longer bearing life. And the Arctic King is flange-to-flange replaceable with Cornell’s long lived and popular CB open drive series. Learn more about the Arctic King.
Centex Visit
CENTEX Africa had a contingent of pump professionals in for a Pump School the last couple days. Classroom presentations from Cornell Pumps PE certified engineers, as well as knowledgeable sales staff, was augmented by hands on learning in the factory.
Cornell Pump is getting ready for Pump School 2017 in January. You can learn about pump hydraulics, efficiencies, terminology, and more—and get great practical learning. At $99* for the two day seminar it’s a steal. Learn more here.
*Distributor pricing
Cornell at RETA 2016
Cornell Pump Company is showcasing its latest refinements in refrigeration pump technology this week at the RETA conference in Las Vegas. Among the highlights are a new, multi-stage hermetic pump model with built-in bearing monitoring that can operate as low as 10 GPM with no cavitation. Come down to the show and greet the crew!
Replacing Packing in a Pump
Ever wondered how best to replacing packing in a pump? Wondered about the right alignment for a lantern ring? Cornell Pump helps end users address these maintenance issues in the latest edition of our how-to video series.
Our video channel includes numerous other videos on the operation, maintenance, and features/benefits of Cornell pumps.
Wear Ring Replacement Video
Cornell Pump produces how-to videos, explaining successful ways to operate and maintain pumps. We recently added a short video on how to install and remove a wear ring. Many of our pumps employ wear rings, and this method can safely and effectively help you change them. Watch the new video below:
Our video page includes numerous other videos on operation, maintenance, and features/benefits of Cornell pumps. You can find additional videos on the Cornell YouTube Channel.
Have a Cornell Pump video you want to see produced? Send the idea to info@cornellpump.com; we’ll do our best to get a video made!
Cornell Pump is exhibiting at MinExpo 2016
We’re in Booth #2275 and the show goes through Wednesday, September 28, 2016. Exhibit hours 9:00 a.m. to 5:00 p.m.
At the Cornell Pump booth, you’ll be able to see the new SM slurry pump. Download a Brochure about this new pump series.
Here are some more Cornell Pump Series designed for mining applications:
- SP Slurry pump for general slurries
- MP Slurries designed for course abrasives
- MX Series for high head mining applications
- N Series general solids handling line
- And our CD4MCu pumps designed for abrasive and corrosive applications
Plus see a new filter feed pump system that can revolutionize ease of use, boasts high efficiency, and minimizes downtime.
Cornell at WEFTEC This Week!
Cornell Pump is displaying at WEFTEC in New Orleans. Open 8:30 a.m. to 5:00 p.m. at the Ernest N. Morial Convention Center. Cornell Pump is in Booth #1529, today until Wednesday. Stop by to see the Waste Warrior cutter (link), designed for aggressive ragging. The Cornell booth also features our STX line of self-priming pumps (link), designed for high efficiency and long life. Plus see our Submersible (link) and Immersible (link) lines of pumps for municipal applications. The Immersible line is specially designed to use readily accessible motors, while being able to be submerged for up 30′ for two weeks, and the submersible line is a premium efficiency design.
We’d love to see you and answer questions!
Keys to Using Pumps In Series
Possible Reasons/Scenarios in Which to Use Pumps in Series:
- When a wide range of flow is required
- When the pumps discharge into a common manifold
- When the system head requirement is greater than can be supplied by one pump
- When system pressure requirements vary
Keys to using pumps in series:
- Same flows, heads are additive
- Not limited to identical pumps
- Continuously rising curves are best
- Check literally everything (seal limits, pump pressure limits, etc.)
Possible Advantages:
- Maintain high pump efficiency with greatly varying heads
- May be able to use some present equipment
- Space pumps throughout system
- Reduces pipe pressures
- Reduces axial load
Possible Disadvantages:
- Multiple pumps may be more expensive
- Larger pumps may offer higher efficiency at design point
- More accessory equipment required