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 ...
ericksonla's user avatar
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, ...
niels nielsen's user avatar
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 ...
NMech's user avatar
  • 24.3k
7 votes
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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,...
mart's user avatar
  • 4,771
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 ...
Olin Lathrop's user avatar
  • 11.4k
6 votes
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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{\...
NMech's user avatar
  • 24.3k
5 votes
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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 ...
ericnutsch's user avatar
  • 8,146
5 votes
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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 ...
Chris Johns's user avatar
  • 15.2k
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 ...
grfrazee's user avatar
  • 3,587
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 ...
ericnutsch's user avatar
  • 8,146
4 votes
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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 ...
ericnutsch's user avatar
  • 8,146
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 ...
user15195's user avatar
4 votes
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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 &...
DLS3141's user avatar
  • 2,145
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 ...
RainerJ's user avatar
  • 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 ...
Chris Johns's user avatar
  • 15.2k
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 ...
joe's user avatar
  • 41
4 votes
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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 ...
loogle1's user avatar
  • 170
4 votes
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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 ...
fred_dot_u's user avatar
  • 7,090
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 ...
Phil Sweet's user avatar
  • 4,755
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 ...
Phil Sweet's user avatar
  • 4,755
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 ...
Ethan48's user avatar
  • 4,541
4 votes
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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 ...
baltakatei's user avatar
4 votes
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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. ...
ericnutsch's user avatar
  • 8,146
4 votes
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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 ...
ChemE mang's user avatar
4 votes

What is this mechanical pump called?

Figure 1. A scroll compressor. Image credit: Cacycle.
Transistor's user avatar
  • 10.8k
3 votes
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Relationship between output mechanical power and max pressure for a pump?

Generally speaking, for fluid systems the mechanical power can be computed as the product of pressure and volumetric flow rate: $\dot{E} = P\dot{V}$ where $\dot{E}$ is the power, $P$ is the pressure ...
BarbalatsDilemma's user avatar
3 votes
Accepted

Centrifugal pumps working

To address the first point without further clarification from your side: I think you mean unstable pump curves with that. Otherwise I wouldn't know how you could achieve a higher operating head than ...
idkfa's user avatar
  • 1,744
3 votes

Decoding pump- valve analogy for medical instrument

My first guess for any medical pump is a peristaltic pump, as they can pump one fluid then another without contamination (by swapping lines). Couple this with the fact that they can also be multi-...
Chuck's user avatar
  • 3,565
3 votes

What happens if we operate a positive-displacement pump in parallel with a centrifugal pump?

Assuming the pumps are connected as in the following diagram, and that the inlet and outlet pipes are sized appropriately, the total flow rate will be the sum of each individual pump's flow rate. ...
Carlton's user avatar
  • 3,054
3 votes
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What is the difference between a piston and a plunger compressor/pump?

Per the Plunger Pump Wiki: A plunger pump is a type of positive displacement pump where the high-pressure seal is stationary and a smooth cylindrical plunger slides through the seal. This makes ...
ericnutsch's user avatar
  • 8,146

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