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Questions tagged [pumps]

For questions about the design, classification and working principle of pumps. A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action.

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28 views

How to resolve the interruptions in the screw pump operation due to air trap?

In one of my application, there is a requirement to dispense the concrete paste at the required rate continuously. some technical details of the application given below Dispense rate 5-50 LPM ...
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2answers
75 views

What does a stalled hydraulic pump mean?

What does it mean when a pump stalls? I could not find a useful explanation with the search terms pump stalling and hydraulic pump stalling. I'm trying to understand what Elon's tweet means. Maybe an ...
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1answer
12 views

Am I calculating the power required and power out for a peristaltic pump correctly?

I am trying to design a peristaltic pump, in a spreadsheet where I can alter the tube and casing diameter, pump RPM and some other parameters, I'm wondering if anyone can spot anything odd in this ...
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10 views

Choosing a blower for a Pneumatic Conveyor

Basically we are designing a pneumatic conveyor system for transferring 11 tons of beans per hour. We need to decide on the specifications of the blower. What are the calculations necessary to decide ...
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22 views

Hydraulic pump specs for a 2 ton tailgate lift

all! I’m mechanical engineering student and I'm doing a project - a tailgate lift for a truck with 2 tons lifting capacity. what are the common values for the flow rate and a working pressure of a ...
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21 views

Where to put the booster pump at customer substation in a district heating system?

In a district heating system, one of the houses in the distribution net is not getting the desired heat into their house. This is because the pipes of this customer which connects them to the ...
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2answers
34 views

Why is the Current to Motor less than Motor Rated Current?

I have a motor for a submersible pump with a Rated Current of 8.4A as given in the motor's electrical data. However, when it is running, I record a current of 3.4-3.9A. Is there a fault I am supposed ...
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1answer
42 views

Gear pump has backflow and does not stop forced flow

I have a "Micropump GB-P25.JVS.A" gear pump. I pump in the range between 100 and 500 ml/min up to a column about 10 cm above the pump level. The column is filled from the top and has a bottom outlet. ...
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1answer
596 views

What is the physical meaning of pulse rate and blood pressure, from a turbo machinery point of view?

Our hearts are peristaltic pumps, which has a periodic compression and expansion. The head developed can be taken as blood pressure. There are situation when the blood pressure is normal while the ...
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2answers
68 views

Submersible sump pump life in pit without water?

What can happen to a pump in a pit without water for many months, then the fall heavy rains start adding water to the pit, will the pump be efficient to do its job? Should water be added to the pit to ...
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37 views

Analytical shape of a pump curve

I'm looking for a formula to arrive at a pump curve for a centrifugal pump: $H(Q, n)$ - total head delivered as a function of flow and speed (rpm), and of course some pump specific parameters. I find ...
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1answer
12 views

Calculating NPSHa for a pump

NPSHa formula - h(sp) +/- h(s) - h(f) - h(vp) h(sp)- static pressure head (absolute) applied to the fluid h(s)- elevation difference between fluid level in reservoir to pump inlet h(f) - friction ...
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2answers
37 views

How does bell housing guarantee the concentricity of the shafts?

I'm talking about IEC motors-gearbox alignement. Here are an example: I found the drawing in cross hydraulic website, so it's quite reliable. What i don't understand, is, how this design makes sure ...
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8 views

Confusion about radial thrust and axial thrust on a centrifugal pump during operation

I’ve read up many websites about radial thrust and axial thrust on a centrifugal pump on the website. And I am struggling to know the difference between them and how they affect the pump differently. ...
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15 views

Does impeller design have a specific cause on how the fluid will flow in a centrifugal pump?

I am a student learning about centrifugal pumps in my studies. I’ve learnt about the 3 different type of flows - axial, radial and mixed. I’ve also learnt about different impeller designs - mainly ...
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1answer
52 views

Pump with high pressure, low delta pressure

I'm looking for a circulation pump in a very high pressure loop and having trouble finding one. I'm hoping I just don't know the correct search term and someone can point me to it. The absolute ...
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2answers
59 views

What happens when pumps are blocked off?

What will be the result if the pipe losses is greater than head produced by the pump? What will be the result if outlet is closed?
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32 views

Centrifugal Pumps - deadhead or minimum flow?

Can a centrifugal pump be truly deadheaded (theoretically) with an open discharge line under high pressure from another source? This assumes no closed isolation valves or check valves - only the line ...
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2answers
39 views

How does a Vibratory Pump (“Schwingankerpumpe”) work?

in my aquarium Ive got a little pump for bubbling air through the water so it is substained with enough oxygen. Internaly the pump works fairly similar to old door bells, where the mains is flowing ...
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1answer
20 views

Would too small tubing reduce the max head of a pump?

I got a mini-project: I want to automatically get rid of the water produced by an indoor air conditioner unit. Since the unit is underground, the water needs to climb ~2m to get to the outside. I ...
3
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1answer
33 views

Why does my VFD and pump configuration stop pumping?

I recently installed a VFD to reduce the speed of my pump, however, occasionally the configuration will stop pumping liquid through the system. The pump is a three phase 60 Hz and this issue has ...
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1answer
88 views

Pump power and fluid viscosity

I used to calculate the power needed by a pump using Bernoulli equation, $ W =(p_2-p_1) + {1 \over 2}\rho(u_2^2-u_1^2) + g\rho(h_2-h_1) + R $ where $\rho$ is fluid density (and assuming it is ...
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1answer
43 views

Can the same diaphragm pump be used to pressurize a container?

If the output of a diaphragm pump is impeded in any way, or meant to be at higher pressure than the input of the diaphragm pump, will it work, or will it stall out and fail to pump? In addition to ...
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1answer
45 views

How were multiple vacuum pumps used to raise water over 10m (e.g. by a steam engine)?

I can imagine a steam engine driving multiple regular old vacuum pumps, which each raise water ~10m. I would think that someone would combine the multiple pumps into a single piece of machinery for ...
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0answers
22 views

What Diesel Pump Should I Use

I am looking at dewatering a old mine pit, going from 1 pit to another, with approximately 150 meters total head @ 0.5 GL volume. The water quality is good. I require approximately 50 to 70 liters ...
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1answer
46 views

Designing for a specific flowrate

I have a simple, practical engineering question. I'm trying to design a hot water circulation system with a constant flow rate of 1.3 L/min. I'm having trouble finding any pumps that will do the job ...
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1answer
47 views

Simplest Way to Make A Pressurized Water Reservoir

I have a vapor system that requires a 50 psi feed of DI water. Without getting fancy, is there a simple commercial off-the-shelf part I can buy, fill with water and hand-pressurize? Or something with ...
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1answer
103 views

Can my total dynamic head (TDH) be more than the “Rated Head” on the pump?

I have just received a recommendation to use a pump with a "Rated Flow" of 1cu.m/h and a "Rated Head" of 91m. I am realizing I am actually not familiar with these two terms (Rated Flow and Head). My ...
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3answers
70 views

Power in a continuous flow pump

I work with left ventricular assist devices in patients with heart failure. These devices operate by maintaining a fixed speed of a centrifugal or axial rotor. The native heart continues to contract ...
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2answers
83 views

How to make water go into my house, from a lake without energy?

Basically, I'm thinking about a system, that filtrates, and makes a lake's water drinkable, drives water into my house's faucets without electricity, and all these should be able to work when it is -...
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0answers
36 views

What happens, when the pump discharge velocity is faster than 3 m/s?

I am doing a gerotor pump application design. I know the velocity of the suction port should be 1 ~ 2 m/s to avoid cavitation. Since I have enough space for suction port, it is not a problem. Yet, ...
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1answer
56 views

Are pumps used in geothermal systems

The water held underground in a geothermal system is under high temperature and pressure. Are pumps used to raise the very hot underground water to the surface or does the water rise under its own ...
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1answer
23 views

Why does net positive suction head (NSPH) include velocity head?

When the absolute pressure dips below the vapour pressure, cavitation occurs. Why would dynamic pressure be taken into account in this case?
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1answer
60 views

High pressure water pumps filling a container. How long does it take to obtain P pressure?

The problem I have at hand is the following: I have a container C with a given volume V. I need to fill it with water, fast, up to a given pressure P. I have a number of high pressure hydropneumatic ...
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1answer
106 views

Water supply system

I have one floor mall with 10 shops (4 meter height), I should supply water from the main drain (3 inch) connected with pressure reducer (1 1/2 inch). I don't have the flow rate of at the 1 1/2 inch, ...
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3answers
601 views

Most efficient/low power consumption way to pump water

I am working on a small project where I, from a relatively confined space in a well that has a diameter of 30 cm, will need to transport the water upwards about 2 meters. I have been looking at ram ...
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1answer
304 views

Can PWM be used to control the flow of a solenoid valve?

Most cheap pump can achieve, according to the Amazon page, around 5 PSI and I would need something a way higher that can still be controlled. I have this solenoid valve. Can I use pulse-width ...
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3answers
519 views

System curve for use in determining pump operating point

What is meant by a "system curve" that is used to determine the operating point of a pump. I know what a "pump curve" is, but I often hear about a "system curve" being generated so that the pump ...
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0answers
51 views

How do I build a water Ram Pump that will pump 400 feet and 30 feet vertically

I'm interested in building a ram pump to pump water from a creek that runs at the bottom of my property to the top where i'm going to make my little homestead. I've seen allot of stuff online on ...
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2answers
80 views

Identifying a connected plate on a gear liquid-metering pump

This is part of an electric resin-extruding machine. What's the part, and if possible, who makes it? Any additional information regarding what the part is, or what the assembly is called, is greatly ...
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2answers
247 views

What's the maximum water jet psi we can create?

Hy everyone, new here, I don't know much about how high pressure water pumping works - ( i'm just a programmer ) but i need to know if we can create water pressures ...
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1answer
46 views

Making a machine from scratch [closed]

Let's assume I want to build, for example, a coffee machine with a special twist from scratch. I guess I would need plans, mechanical evaluations, CAO, then machining or 3D printing. I also guess I ...
3
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1answer
178 views

What is this plumbing apparatus?

This device is about five feet tall. It is located in a ground-floor alcove in the exterior of a commercial building on a public street in Santa Monica, California. Each of the chained manual valve ...
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2answers
66 views

Change of fluid of Pump

If the fluid moved by a pump is changed by another different one, what will be the effect of such kind of operation for the pump ? Specifically, a pump moving 60 m3/hr of "liquid nr. 1" (sp.grav.: 0....
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4answers
117 views

What type of air blower/compressor to use?

I need a way to move air which is somewhere in between a compressor and a fan: something along the lines of 20-40 cfm at 2-3 psi (500-1000 liters/minute at 10-20 kPa). Typical small compressors (of ...
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2answers
118 views

How can I build and maintain an accurate pressure on a fuel line without using a fuel pump?

Background I am building an engine from scratch for the sole purpose of becoming a better mechanical engineer--I'm currently a second year undergrad. The engine I'm designing is a single piston 4-...
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1answer
62 views

What are reasons to use cutting speeds different from recommended? [closed]

In my experience, many companies do not use the recommended cutting speeds for materials. In general, it seems they opt for lower cutting speeds. Is there a reason they typically do this?
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1answer
4k views

Can a water-pump pump diesel?

After some research, I found that diesel is my choice of fuel. Now I need a way to pump it to the engine. My main constraint is price. So my question is can I use a water pump like one of these, to ...
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1answer
42 views

What is the pressure to secure certain temperature?

How to calculate the pressure needed for a pump to ensure a specific temperature in a pipe? For example, there is a pipe 100m long. A booster pump is needed to pump water with supply temperature 70 ...