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Recent content by jhelm
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PUMP TO MANAGE SLURRY
Because slurry properties vary widely and there are different types of slurry pumps that are suited to different slurry characteristics it is difficult to offer a meaningful answer to your question without more details. What type of slurry are you dealing with (mineral or organic solids)? What...- jhelm
- Post #2
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Motionless Mixer Calculations
The answer to your question depends on the specific design of the static mixer elements. The shape of the spiral,( sharpness of the curves and transitions) will affect the pressure drop through the mixing elements. If possible, your best bet is to contact the manufacturer of the mixer with the...- jhelm
- Post #2
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Optimum Shell/Diameter for Flat bottomed Tanks
Here is another possible consideration to throw into the mix. If you are going to agitate the tank with a propeller type mixer, the height to diameter ratio can impact the mixer selection. Generally, for a top-entering agitator with a vertical shaft, a height to diameter ratio of 0.80 to 1.2...- jhelm
- Post #3
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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sludge pump reliability
We have seen Moyno (r) pumps operating with excellent reliability in a variety of sludge applications. having said that, the real answer to your question lies in the details. "Sludge" can vary from a low solids organic slurry with little or no abrasion to a high solids, mineral laden...- jhelm
- Post #3
- Forum: Pump engineering
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HEAD OR PRESSURE
The pressure is what stays the same. Head is expressed in feet of water, so it is corrected for specific gravity, as you noted. The Cameron Hydraulic Data book has a detailed explanation of this and other concepts. Also see the Hydraulic Institute website at www.pumps.org.- jhelm
- Post #2
- Forum: Pump engineering
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Water lubricated journal bearing on pumps
You might try contacting major manufacturers of vertical turbine pumps for further information. Many have helpful engineering data and practical experience. Some of the substantial manufacturers include IDP, Fairbanks Morse, Aurora, Byron Jackson, Johnston and Floway. There are many others.- jhelm
- Post #3
- Forum: Pump engineering
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Centrifugal Pump Suction Conditions
Maybe it was my answer that sucked. It is a confusing topic, as evidenced by your explanation, which also used the term "push" as well as mine. I should probably avoid the terms "suck" and "push" entirely, as they are not very clear. The reduction in pressure at...- jhelm
- Post #5
- Forum: Pump engineering
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Service Index - Materials Compatibility
The most complete corrosion and chemical compatibility guide that I am aware of is the Compass guide. I believe they have a website. The guide is available on CD and covers alloys as well as plastics.- jhelm
- Post #2
- Forum: Corrosion engineering
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Centrifugal Pump Suction Conditions
You are correct that centrifugal pumps don't "suck," however, they can affect upstream conditions. What the pump does is to reduce the pressure at the inlet to the pump, allowing the system pressure to "push" more liquid into the pump. What you have to be concerned about is...- jhelm
- Post #2
- Forum: Pump engineering
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Disposal dilemma
If the creek is an intermittent one that does flow during heavy rains or for part of the year, there may be some subsurface flow occuring all of the time below the stream bed. Your effluent flow may filter down through thre creek bed into this shallow aquifer. You could potentially test this...- jhelm
- Post #2
- Forum: Waste disposal & treatment
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FRICTION LOSS THRU .25" ID TUBING
Rick, thanks for your correction. I did not notice the error in the formula when I posted it. I was having trouble working out how to get the formulas to be clear. Regards, Jeff- jhelm
- Post #4
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Lift Pumps
Assuming you are talking about a positive displacement screw pump (as opposed to an Archimedes type inclined screw pump), the answer depends on the specific type you are using. There are two, three and five screw type pumps that are all metal construction. These either use timing gears or, in...- jhelm
- Post #2
- Forum: Pump engineering
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FRICTION LOSS THRU .25" ID TUBING
You will need to calculate the pressure drop using a formula such as the Darcy-Weisbach equation. The Cameron Hydraulic Data book published by Ingersoll-Rand has a detailed explanation of the calculations necessary. Here is a short version that may be of some help: Darcy-Weisbach equation...- jhelm
- Post #2
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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MSW and sewage sludge coincineration
For additional information, you might try the website of the Water Environment Federation (WEF). This is a large industry organization of wastewater treatment professionals. They have an extensive library of reference books available for purchase on line, and I believe that there are some that...- jhelm
- Post #2
- Forum: Waste disposal & treatment
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prefabricated sewer systems
If you mean a packaged wastewater treatment system, you could contact Chief Industries in Grand Island, Nebraska. They make the Ecolo-Wastewater Treatment System that is designed for small cities and villages including subdivisions. Their system is pre-fabricated, takes up much less space...- jhelm
- Post #2
- Forum: Waste disposal & treatment
