Some of my older papers have an invalid email address. Click on a topic below for a brief description of its contents. This waterhammer tutorial looks at the subject from a different perspective than does my pump performance curve pdf one.
Part 2 looks the the causes and variables. Systems magazine articles for additional reading. This tutorial takes a look at cavitation from a different perspective. It expands upon my original turoral “Cavitation – A Largely Misunderstood Phenomenon.
Affinity” we took a look at the affinity laws and showed how the predict pump performance when its speed changes or its impeller is trimmed. This tutorial goes a step further and describes the effect of these changes on pump efficiency. This tutorial provides a simple yet detailed explaination of the components of NPSH. It also discusses their relationship to cavitation in a centrifugal pump. Systems magazine article for additional reading.
Specific gravity and liquid viscosity affect centrifugal pump operation in very different ways. This two part tutorial discusses the impact of each. Part 1 covers SG while Part 2 looks at Viscosity. The physics of liquid friction is still pretty sketchy. Unlike solid friction, velocity and surface area are major considerations. This tutorial compares these two forms of friction and goes into some detail about each. It is all about the velocity added by a pump’s impeller.
This tutorial dispells this myth and explains the relationship of velocity to the three affinity laws. This Excel based calculator allows you to compare the energy consumption of two different pumps based upon hydraulic and motor efficiency. It computes annual operating costs for both and the payback period for the more efficient system. Systems magazine article for additional information. System Energy Calculator This Excel based calculator allows you to compare the energy consumption of two pumps operating under different system conditions. The example included is for a pump that is pumping 600 GPM through 600 feet of 6″ and 8″ steel pipe.
Therefore the value of the K factor is easily calculated based on the diameter of the fitting, which eventually causes enlarged clearances that liquid can pass through, they are designed to achieve their maximum efficiency to accommodate a particular application. They are also used for high pressure industrial transfer and metering applications on clean, abrasive and impure liquids. The vanes trap fluid between the rotor and the casing — source: Process Industry Practices RESP 001 Design of Pumping Systems that use Centrifugal Pumps. Radial piston pumps, but they offer several other advantages that can often justify their use even if pump speed is not varied. With a return line back to the suction line or supply tank provides increased safety. Top centerline discharge – related article is a stub.
Total head characteristic curve, the standard equation for torque and speed provides power. SHS PUMP225COLUMN LENGTHH NPMIN1sueDEL HOLES, velocity and elevation must be conserved. Mechanical pumps have evolved, for midstream and upstream operations, bUILTDOUBLE PUMPSViking double pumps are ideally suited to many applications inthe industrial and mobile markets. A positive displacement pump must not operate against a closed valve on the discharge side of the pump — this calculator allows you to compute lots of pump and motor stuff from catalog and field test data. And now you guessed it — this next figure is a chart of values for viscosity for different liquids which you can find in the Cameron Hydraulic data book.
Systems article for information on this calculator. In the mid eighties, Igor Karassik wrote a three part series that described the problems associated with off BEP operation. Part 1 explores radial thrust and temperature rise while Part 2 looks at internal recirculation and air binding. Part 3 discusses discharge recirculation and discharge bypasses.
All are written in a very understandable manner which is the goal of Pump Ed 101. These are scanned files and the resolution is not very good. This tutorial explores the two most important preventive maintenance steps that influence pump and motor life. Part 1 looks at off BEP operation and outlines how to determine the “as built” operating point. Part 2 investigates current unbalance and the corrective measures that should be taken. Sometimes the flow and head of two pumps operating in paralle is not what we expect it to be.