It also includes a simple pipe friction calculator. Created with softening agents for both hair and skin, this is the perfect shaving creme for the "Coochy"! The five categories are "sub-threshold", "mild", "moderate", "severe" and "non-recovery", the latter being procedures in which an animal is anesthetized and subsequently killed without recovering consciousness. Fluorinated hydrocarbons, fluorocarbons Formula: Coal tar or its fractions can also be used for waterproofing, paints, pipe coating, roofing, insulation, pesticides and in medicine.
No matter what your shipping needs, Walmart's got you covered. Sign up for Shipping Pass so you can shop more, save money and live better. Width 2" to 2. Length Less Than 6 ft. Please enter a minimum and maximum price. Special Offers Reduced Price.
Showing 40 of results that match your query. Product - Goodyear Basic Pump. Product Title Goodyear Basic Pump. Already a Shipping Pass member? Free returns online or in-store Not completely satisfied? We've made returning items as easy as possible. Never worry about minimum orders Order as often as you like all year long. Do resistive and inductive circuits behave differently? What is power factor and what does it have to do with reactance?
How can capacitive reactance be used to correct the problems caused by inductive reactance? This short course is designed for the pump professional who wants to gain a basic understanding of AC power and its application to electric motors. Why not debunk some of those myths surrounding VFD's and learn how simple they really are.
Did you know that they have been around, in one form or another, since the invention of the AC induction motor? This short introduction will help the pump professional gain an understanding of their inner workings, potential problems, and some of the applications for which they are well suited. The vast majority of failures of new electric motors can be attributed to improper selection, installation, and start up.
Although factory defects do occur, they are rare and are quite apparent upon tear down and inspection. This short publication is a guide to the proper selection, installation, and start up of new and replacement centrifugal pump motors.
Download 35 K Acrobat Document. The resonant frequency of and object is the frequency at which it begins to vibrate of its own accord. In this demonstration, by the University of Michigan Physics Laboratory, sound waves are porduced at various frequencies and projected upon a wine glass. A strobe light allows us to view its vibrations and eventual shattering. Download "Variable Frequency " for a detailed explaination of resonant frequency and its potentially damaging effect upon pumps.
Some manufacturers believe that filling a motor with oil is the only way to go while others think air to be a better solution pun intended. This paper takes an honest look at these two popular submersible sewage pump motor designs and compares the advantages and disadvantages of each. Topics covered include motor efficiency, heat transfer, bearing lubrication, maintenance, and environmental concerns.
This overview discusses the various impeller designs used in raw sewage pumping applications. Designs covered include the major members of the radial vane family, the vortex impeller, and the centrifugal screw. During the past thirty years, low pressure grinder pump sewer systems have become a popular alternative to traditional gravity systems. The two basic pump designs, centrifugal and positive displacement, used in these systems are as different as night and day.
This short article discusses the operating characteristics of centrifugal and positive displacement grinder pumps when installed in a pressure sewer system. Hertz is an Excel program that allows you to illustrate the laws of affinity, perform a design point calculation, and plot centrifugal pump performance curves as a function of frequency or RPM.
It is named for the German physicist, Heinrich Hertz, who discovered the very low frequency electromagnetic radiation we now call radio waves. After many decades of cps cycles per second we are finally giving him credit. Directions for its use can be found at the bottom of the spread sheet. You can also enter a system curve so that you can evaluate your selection.
Instructions for custom plots are also included. Download K Excel Document. CPSA is an abbreviated and simpler version of Hertz but, also has some additional features. There is nothing else to muddle the picture and there is no need to scroll side to side or up and down.
It also asks for the hydraulic efficiencies for each of the flow points and, in return, prints the HP required as "data lables" on each of the frequency curves.
This allows you to quickly determine the power savings for an application using a given pump. If you enter the power requirement for each of the flow points for the 50hz curve, it will generate "power data lables" on each of the frequency curves. If you enter the power requirement for each of the flow points for the 60hz curve, it will generate "power data lables" on each of the frequency curves. But as operation moves away from BEP especially to the left the net radial thrust increses quickly.
Unbalanced radial thrust can cause increased shaft deflection which can lead to increased seal, bearing, and wear ring wear. In some cases it can cause the shaft to break. Suction Calculators - Joe Evans, Ph. You can also purchase the book at Amazon. Perez directly at rxperez pumpcalcs.
Basic Hydraul ics - Centrifugal Pumps Click on a topic below for a brief description of its contents. Download Return to Titles Energy Calculators Wire to Water Energy Calculator This Excel based calculator allows you to compare the energy consumption of two different pumps based upon hydraulic and motor efficiency. Download Return to Titles System Energy Calculator This Excel based calculator allows you to compare the energy consumption of two pumps operating under different system conditions.
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 These are scanned files and the resolution is not very good. 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.
This tutorial takes a look at the performance of identical and dissimilar pumps and the effect of the system curve. Part 1 compares the pumps and Part 2 factors in the system curve. Download Part 1 Download Part 2 Return to Titles Pascal's Principle - Paradox Lost The pressure exerted by a colum of water depends upon its density and hight - - it has absolutely nothing to do with the its volume.
In this tutorial we take a close look at this paradox and provide various examples that support Pascal's Principle. And, ofcourse there many inbetween. This turorial looks at how the shape of a performance curve can influence a pump's performance in a particular application.
Should you install a 4" pump and run to the left of the performance curve? This tutoral provides several options that will enhance pump life. It turns out that their lower maintenance will often substantially reduce overall operating costs even though electrical costs may be slightly higher. This tutorial explains vortex action and provides several examples that show why this type of pump may be a better choice. In fact it was often a necessary evil. With the advent of the VFD you may be able to achieve relatively constant flows and reduce the energy required.
This tutorial investigates the possibilities. This tutorial uses a constant pressure application to show you the proper way to do that comparison. Download Return to Titles Variable Frequency Control - Other Advantages VFD's can reduce energy consumption by allowing a pump to run at the duty point required by the system and it can change that duty point in real time.
But they offer several other advantages that can often justify their use even if pump speed is not varied. This tutorial explores those other advantages. That is how it varies the motor speed. But, did you know that it must also vary the voltage? If it did not, the magnetic field produced by the stator would become saturated and torque would become unreliable. Download Return to Titles. Resonance arrises when a variable speed pump reaches a critical speed.
It turns out that the first or lowest critical speed can be easily calculated from simple data provided by the manufacturer. This tutorial explores resonant frequency and shows how to calculate the speed that causes it. Pump Field Test Calculator The version of my field test calculator allows detailed testing of pumps in the field.
After entering the required data the calculator will calculate velocity, velocity head, TDH, average voltage, average current, unbalanced voltage and current, water HP, test point HP, pump efficiency and the cost per gallons pumped. All equations used for calculations are shown on the spreadsheet. Complete instructions are included. It then calculates the flow velocity past the motor, the effective flow ID and the friction per motor foot.
This simple, Excel program standardizes the measurement process and also calculates TDH. Discharge velocity head is also calculated and included in the TDH calculation. The Drawdown combo calculator is designed for older wells that use a partition to accommodate both wet and dry pits in the same well. A drawing on the sheet explains their use.
The origional versions were test versions that were uploaded accidentally. In cases where lower HP motors are used to run a pump at some maximum frequency, it is important to make sure that the HP available at that frequency is sufficienct.
This calculator will show you the required vs available HP. Although not as comprehensive as some of the online versions, this calculator allows you to compute the friction for up to three piping segments.
It also allows you to select the valves and fittings for each segment. On the motor side it computes HP, torque, kVA, power cost per hour, voltage unbalance and current unbalance just to name a few. It also includes a simple pipe friction calculator.
You will have to check it out to see the rest. Some internal gear pumps have an additional, crescent-shaped seal shown above, right. From Wikipedia, the free encyclopedia.
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