15
votes
Accepted
Can a water-pump pump diesel?
With pumping diesel, your main constraint should be safety, not cost. There are very good reasons diesel pumps aren't for sale for $5 on amazon.
The main things you want to look at are 1) whether ...
- 772
12
votes
What is the physical meaning of pulse rate and blood pressure, from a turbo machinery point of view?
high pulse rate + low pressure means low pumping efficiency of the heart. this can be caused by:
leaking valves, especially the main aortic valve, due to disease or calcification;
low blood volume, ...
- 14.1k
9
votes
What will happen if I run a submersible pump without water?
The motor will spin much faster than it does normally when loaded by the pump moving water. This higher speed may wear out something much quicker than during normal operation.
The system should be ...
- 11.4k
7
votes
How to divide the water flow into outlets with equal flow each?
Even if you had matching orifices, you might have issues with the pressure drop inside the pipes and corners.
If you are really after matching flow rates, you could look into flow control valves/flow ...
- 24.2k
7
votes
Accepted
Does any know what kind of pump "Colossus" used for saving the Notre Dame Cathedral?
This is not a definitve answer, but since I went to the trouble to look it up I thought i might as well post what I found: Pretty sure there's no onboard pump
As you can see this is a normal firehose,...
- 4,720
6
votes
Water pump at top floor or bottom?
Think about the pressures. With the pump above the supply line, the pressure at the input of the pump will be lower than the supply. At roughly 2 PSI per foot, you're down about 18 PSI.
Since air ...
- 11.4k
6
votes
Accepted
Can you help me to interpret technical drawings?
50 and 22 refer to diameters of the conical bit. Usually in axisymmetric objects you denote diameters. It is the same as the 36 and 45 diameters (which are more easily understood).
So it is:
$$\sqrt{\...
- 24.2k
5
votes
How to make a micro water dripping pump with little or no electrical input?
Despite the terminology differences I believe this is what you are looking for.
http://www.treegator.com/
The ready-made pump is called gravity. The pressure of gravity pushes down on the closed ...
- 435
5
votes
Small bubbles on a pump discharge
I have noticed that on the discharge port of the pump, a short row of bubbles comes out at high flows and low pressures.
This does indeed sound like cavitation to me.
Cavitation occurs usually in ...
- 3,587
5
votes
Accepted
Small bubbles on a pump discharge
As well as 'proper' cavitation which is a fairly high energy phenomena and certainly a concern in terms of wear on the working surfaces of the pump it is possible that pressure changes are causing ...
- 15.1k
5
votes
Accepted
Transfer pump suitable for air, water and their mixture
The terms you are looking for are "self priming pump" and/or "run dry pump".
Centrifugal self priming pumps require some water to be in them to start, but can pull a vacuum including air.
Diaphragm ...
- 7,804
5
votes
What kind of impeller pump is this? (photo)
It is called a Regenerative Turbine Pump. It is lower efficiency than a staged centrifugal, but would fill the higher pressure single stage niche. Even though its max efficiency may be lower than a ...
- 7,804
4
votes
Accepted
Why do pumps really exists?
hm...
I presume the term does not compress is what kicked of this question.
Right?
The task of a pump is to store energy in the fluid (potential energy in the form of pressure). This stored energy ...
- 1,192
4
votes
Vacuum Pump Power Calculation
Different techniques have been developed to evaluate the
efficiency of energy use by a vacuum pump. Most vacuum pump manufacturers catalog
their test results, including brake horsepower (actual hp) ...
- 251
4
votes
What will happen if I run a submersible pump without water?
There are good answers here, but just wanted to clarify some points. It's important to consider what the liquid (in this case water) is used for in the pump.
To begin with, it helps to see that the ...
- 41
4
votes
Accepted
How do pumped flows combine in a Y connector?
General rule when dealing with fluids
The fluids will travel the path of least resistance. Treat them as dumb and lazy and you'll understand the process better; fluids will only travel where you make ...
- 435
4
votes
Accepted
Replace mercury with silicone oil in diffusion pump
I did some internet searching and did not find anyone that had done a direct swap out. Granted, probably the majority of these replacements occurred before the existence of the internet ;-). As I am ...
- 7,804
4
votes
Accepted
What's the difference between impeller and rotor in centrifugal pump?
An impeller is the type of rotor found in a centrifugal pump, in fact another name for "centrifugal pumps" is "impeller pumps". Many different types of pump have rotors.
The pump &...
- 2,135
4
votes
What is the pressure to secure certain temperature?
Pressure adds only a to the temperature of water. Pump pressure allows water to be moved, it is not used to maintain the temperature of the fluid being pumped. To minimize thermal loss of fluid in a ...
- 21
4
votes
What are reasons to use cutting speeds different from recommended?
By necessity recommended speeds and feed rates are generalisations and, in practice the optimum for a given job can vary a lot. Recommended speeds are typically intended to be a reasonable compromise ...
- 15.1k
4
votes
What is this plumbing apparatus?
it has to be water for fire because its red. its on the out side so they can control the water without going into the building. the open pipe is to drain the water for maintenance. it does not have a ...
- 41
4
votes
Accepted
Are pumps used in geothermal systems
They are both correct. There are actually a number of different types of geothermal power plant with the most common being, dry steam, flash steam, and binary cycle.
Dry steam plants require pumps ...
- 170
4
votes
Accepted
Simplest Way to Make A Pressurized Water Reservoir
A well storage pressure tank may serve your purpose. There are reverse osmosis tanks that are designed to handle up to 100 psi (per Amazon item post) and ordinary well tanks with internal bladders ...
- 6,875
4
votes
Designing for a specific flowrate
Many commercial hot water recirculation pumps will do that. Just grabbed one at random - Grundfoss Alpha1 15 40 130.
I couldn't fetch the page after I ran their calculator. I used temp of 99C and ...
- 4,337
4
votes
Pump Placement Question
Yep, it would probably take half a day for that pump to fill a suction hose that long. Also, there is pressure loss once the flow rate picks up. This means the pump will cavitate before it reaches ...
- 4,337
4
votes
Accepted
AC Motor On/OFF Control using SSR instead of contactor
Yes, but...
There's not great data available on the Fokotek products, but in general switching HP sized motor loads with solid state relays is a fairly expensive proposition. Because the voltage and ...
- 4,531
4
votes
Accepted
Divide Flow and Maintain Pressure
Short answer:
I suspect that so long as your pump is a positive displacement pump (ex: the "vibratory pump" or "rotary vane pump" as described in this webpage about espresso pumps) and is sized to ...
- 532
4
votes
Accepted
Determining Pump Dead Head Pressure and Pump Curve
To build a pump cure (especially when you don't have many data points), first look at an existing pump curve for the pump technology you are inspecting. Here is one for a Regenerative Turbine Pump.
...
- 7,804
4
votes
Accepted
What is the difference between a single-stage pump and a centrifugal pump?
Single stage and centrifugal are describing two different properties.
A single stage pump is a pump that only has one acting impeller stage doing work on the fluid. If you put two pumps in series, you ...
- 605
4
votes
Only top scored, non community-wiki answers of a minimum length are eligible