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Centrifugal Pump Problems & Answers
ESBN: C60-592B-1A38-60B0
Description:  

If you have a centrifugal pump problem, the odds are Mike Sondalini has included the solution in this very detailed e-book - "Centrifugal Pump Problems & Answers".

Mike goes through the problem solving steps in detail with his own experiences and research. Although this book primarily focuses on the centrifugal pump, many of the solutions are applicable to well... pumps in general.

With over 50 sections, we can only list a few here. Some of the areas of discussion are flow, mechanical seal, bearings, rotor, cavitations, liquid density, couplings, vibration isolation, fan, metal corrosion, impeller, balancing, alignment and even the effects on electric motors.

 If you have a centrifugal pump problem, Mike has the solution. Get a copy of "Centrifugal Pump Problems & Answers" now

Download E-book immediately after purchase

Price:  US$35   NOW US$15.00 

The free online e-book sample below is copyright protected. You may not modify, publish, transmit, display, participate in the transfer or sale, create derivative works, or in any way exploit, any of the free online ebook sample content, in whole or in part. 

Vibration and out-of-balance equipment

ABSTRACT

When spinning equipment is out of balance. Vibration from out-of -balance rotating equipment can be frightening. The ground shakes, machines jump about, hold down bolts come loose and parts break. An unbalanced rotating body will produce forces on its bearings and transmit them throughout its structure and into the foundations. 

Keywords: rotor, centrifugal forces, balance quality.

CAUSES OF OUT-OF-BALANCE

Below lists some common causes for unbalance.

ball bearing   Bent or bowed between support bearings

  Overhung weight bends shaft under gravity

  Unevenly distributed solid or liquid inside rotor

  Loose parts on the rotor

  Eccentrically manufactured diameters on the rotor

  Misalignment of the drive train to the rotor axis

  Loose drive couplings flop about

  Loose tolerances between assembled parts on rotor

  Shoulders on rotor manufactured out-of-square to axis

  Voids or cavities within the rotor

  Misalignment of bearings force shaft to bow

The drawings below provide examples of some of the problems listed in the table above.

Vibration analysis
Example only...

Pump Types Explained
ESBN: C60-592B-1A38-60B2
Description:  

If you own, work with or are studying a water pump, sump pump, pool pump, chemical pump, industrial pump or any other type of pump, you will find the knowledge in this book by Mike Sondalini very valuable.

Mike gives you insight to design, uses, installation, calibration, troubleshooting and maintenance for the various pump types in his book titled "Pump Types Explained". Mike starts out with details about the centrifugal pump with pump curves, cavitations and how to correct the situation.

In addition to the centrifugal pump chapters, the peristaltic pump (hose pump), metering pump (dosing pump), gear pump, helical pump and the magnetic drive pump are explained. Of special interest during the design phase is Mike's cost / accuracy guide to pump types.

 Learn how to choose the right pump for the job, get a copy of "Pump Types Explained" now!

Download E-book immediately after purchase

Price:  US$19.99   NOW US$12.50 

The free online ebook sample below is copyright protected. You may not modify, publish, transmit, display, participate in the transfer or sale, create derivative works, or in any way exploit, any of the free online ebook sample content, in whole or in part. 

GEAR PUMP OPERATION & MAINTENANCE

ABSTRACT

Gear pump operation & maintenance. A gear pump uses two meshing, toothed cogs to force liquid from the inlet of the pump through to the outlet. Being a positive displacement pump there deliver very precise quantities for each revolution and this means they have good dosing characteristics regardless of their speed or the pressure into which they discharge. 

Keywords: internal, external teeth, pressure relief, viscosity.

Figure No. 1 shows a simplified drawing of an external teeth gear pump on the left along with the alternate arrangement of internally pointing teeth.

pump maintenance


Figure No. 1. External and Internal Teeth Gear Pumps

 GEAR PUMP DESIGN

Gear pumps use toothed gears turning inside a close tolerance housing to draw-in liquid and then squeezing it out ahead of them. Paddle steamers used the same principle of operation. These pumps are positive displacement pumps and anything drawn into them will be forced out. As a consequence they can generate very high discharge pressures. Materials of construction vary from metals of various types and hardness through to plastics of various types and hardness.

 Maintaining the close tolerances between the housing and the cogs is critical to efficient operation. The clearance between the edges, of the teeth and the housing and the ends of the cogs and the back and front walls of the housing are very small. Between the teeth and housing it is in the order of 0.1 mm (0.004”) while the clearances between the front and back faces of the gears and the ends of the housing are only 0.025 mm (0.001”). The fine clearances reduce liquid re-circulation back from the high-pressure discharge to the low-pressure suction side and make these pumps one of the most efficient available.

 Gear pumps usually have one shaft penetration through the housing for connection to the drive. The gear shafts on the smaller pumps can be supported in journal bearings within the ends of the housing and are lubricated by the product. On larger pumps rolling element bearings mounted in bearing housings are used. To prevent surface to surface contact of teeth the product provides the lubrication.

gear pump, pump design

Continued in "Pump Types Explained" E-Book ...

Price:  US$19.99   NOW US$12.50 

Pumping Basics
ESBN: C60-592B-1A38-60B1
Description:  

Before you tackle that pump project or repair, download Mike Sondalini Ebook "Pumping Basics". Mike pumps his years of experience into this ebook offering advice from mechanical seal to fluid dynamics. Well, the ebook does cover a little more than just basics with formulas, pressure, cavitation, pipe size, npsh and more. 

Mike Sondalini reflects on real life experiences with the centrifugal pump, sharing knowledge you can apply on your horizontal centrifugal pump and vertical centrifugal pump. Pumping basics also covers issues to consider when moving a slurry pump. Covers basics, maintenance and repair. Learn about pumping basics before you tackle that submersible water pump. A must read for facilities maintenance and engineering.

 Don't wait until your facilities are under pressure, get a copy of Pumping Basics now!

Download E-book immediately after purchase

Price:  US$19.99   NOW US$12.50 

The free online ebook sample below is copyright protected. You may not modify, publish, transmit, display, participate in the transfer or sale, create derivative works, or in any way exploit, any of the free online ebook sample content, in whole or in part. 

HOW FLUIDS FLOW IN PIPES (Cont.)

VISCOSITY AND DENSITY EFFECTS

 Liquids do not all behave the same.  Blood has different flow characteristics than water.  Paint flows differently to gasoline petrol.  Liquids are categorized by their behaviors when undergoing shear.  Those liquids that have a constant shear rate with change of velocity (like water) are called Newtonian ( Newton first developed the mathematical explanation for the phenomenon).  Those with shear rates that vary with changing velocity (like paint and blood) are Non-Newtonian.  The shear rate is a measure of a fluid’s viscosity or slipperiness.

 The density of a fluid affects its viscosity.  Fluids with more mass per unit volume are heavier and require more energy to move them and shear less easily.  A temperature rise decreases the viscosity and density of liquids.

 The more viscous, or less slippery, a fluid the harder it is to get shearing between layers.  The high viscosity prevents rapid velocity changes occurring between layers.  The sub layer in viscous fluids is thicker than in low viscosity fluids.

 VELOCITY EFFECTS

 At low speeds the whole flow across a pipe is laminar and the fluid slides over itself.  As the speed becomes faster eddies start to form and cross the fluid layers.  A transition from laminar to turbulent flow develops.  At still higher velocities the flow in the core of the pipe becomes turbulent with swirling eddies throughout.  Figure 2 shows where the various flow regions occur at a tank nozzle.

viscosity pressure loss water pumping
Figure 2.

The laminar sub layer is always present against the pipe wall.  But as the velocity rises the energetic swirling eddies begin to impact more deeply and the sub layer begins to thin.  At still higher velocities the sub layer thins further and the taller roughness peaks stick into the turbulent region.  Where the sub layer covers the roughness projections the wall is considered ‘smooth’.  When the wall roughness pokes out of the sub layer the wall is considered ‘rough’.  This means the same wall can be both smooth and rough depending on the fluid’s velocity.

Experiments have proven the pressure loss along a pipe with laminar flow is proportional to the velocity (p V) where as for turbulent flow the pressure loss is proportional to the square of the velocity (p V2).  A slower flow permits a thicker sub layer and creates a ‘smooth’ pipe wall.  This minimizes the losses along the pipe.  There is a very much greater loss of pressure in turbulent flow.

The pipe system designer has to strike a practical balance between increasing the pipe diameter to reduce energy loss and keeping the diameter small to lower installation costs.

Continued in Pumping Basics E-Book ...

Price:  US$19.99   NOW US$12.50

SILVER - Best Practice Reliability Training Program
ESBN: C60-59CD-5y38-80C4
Description:  

Address the worldwide problem of the profit destroying lack of knowledge in workforce maintenance and engineering know-how and skills with the in-house, do-it-yourself Feed Forward Best Practice Maintenance and Engineering Reliability Training Program.

 Get your technical people teaching your production and maintenance workforce how to deliver concrete improvements in process, plant and equipment reliability and work quality … exactly suited to your operation.

  Developed to solve the technical knowledge gap problem in industry.  Written by maintenance engineers and managers with years of hands-on experience in process chemical plants, process manufacturing plants, food processing and packaging plants and equipment design and manufacture, the program is filled with countless valuable reliability engineer and manager insights that flow onto the workforce.

   Established in June 1999 and already translated from English into Korean, the reliability training program is used and promoted around the world. 

Shipped to address in your pay pal account unless you specify alternate.

Price:  US$1,200 NOW US$299 (FREE shipping)

GOLD - Best Practice Reliability Training Program +5 PMAs
ESBN: C60-59CD-5y38-80C5
Description:  

Address the worldwide problem of the profit destroying ignorance gap in workforce maintenance and engineering know-how and skills with the in-house, do-it-yourself Feed Forward Best Practice Maintenance and Engineering Reliability Training Program.

 Get your technical people teaching your production and maintenance workforce how to deliver concrete improvements in process, plant and equipment reliability and work quality … exactly suited to your operation.

  Developed to solve the technical knowledge gap problem in industry.  Written by maintenance engineers and managers with years of hands-on experience in process chemical plants, process manufacturing plants, food processing and packaging plants and equipment design and manufacture, the program is filled with countless valuable reliability engineer and manager insights that flow onto the workforce.

   Established in June 1999 and already translated from English into Korean, the reliability training program is used and promoted around the world. 

Shipped to address in your pay pal account unless you specify alternate.

Price:  US$1,300 NOW US$399 (FREE shipping)

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