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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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Bronze Journal Bearing "Break-In" Period

I'm being told that the bronze journal bearing corresponding to a stainless steel shaft requires some time to "break in". Please note that these are used bearings that have been removed and ...
Adrian Beltran's user avatar
1 vote
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39 views

Donkey pump is centrifugal or positive displacement?

Donkey pump belong to which category of pumps?Is it centrifugal or positive displacement? According to my understanding it is positive displacement. Please correct me if i am not right I have also ...
DSP_CS's user avatar
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1 answer
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Affordable food-grade high-viscosity pump

I am looking for a affordable electric-powered pump to pump high viscosity chunky mayonnaise-based dips (the chunks are things like blended olive, diced and caramelized onions, string-y scallion, etc)....
Kovy Jacob's user avatar
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0 answers
21 views

What is the theoretical Head of a centrifugal pump when an infinite number of vanes are asssumed?

I came across this question in my Fluid Machinery Course: A centrifugal pump of 1.25 m diameter is designed to pump 1.5 m3/s through 75 m height, whilst running at a speed of 600 rpm. At outlet the ...
Matthew jk's user avatar
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1 answer
28 views

Controlling brushless dc pump when only 2 cables are provided

Water pump in question is the "High Flow 3M- 15M 12v Water Pump 12 Volt DC Mini Water Pump", the submersible model, from alibaba. link: https://www.alibaba.com/product-detail/High-Flow-3M-...
jeitraeky's user avatar
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24 views

system curve with two different pumps

I’m trying to understand how to calculate a system curve that accounts for two different centrifugal pumps in parallel, each with a different fluid and different flow rate. These two lines will then ...
leo's user avatar
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0 answers
48 views

Pessure required for pumping seawater through pipe with inlet at a depth below sea level

I need to calculate the head capacity required at the pump, to pump sea water from a depth of 100m below sea level i.e. inlet is at 100m below sea level, the recieving end is at 5m above sea level. ...
manuel martin's user avatar
1 vote
1 answer
37 views

Formed Suction Intake - What is the purpose of splitting it?

Some FSI's appear to be split down the middle. Others appear to not have this split. What purpose does this component serve? Is this component ever serving the purpose of a structural support?
Adrian Beltran's user avatar
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68 views

what is the most efficient technology for pumping huge amounts of seawater to great heights

if we had to pump up huge amounts of water, almost 5 million metric cubes per hour to a height of 800 meters what would be the most energy-efficient solution? how much energy would this consume? and ...
aSaffary's user avatar
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38 views

Which electrical portable fluid pumping actuators that aren't based on electric motors, combustion engines, or piezoelectric actuators?

So, basically, I'm trying to find a practical, electrical, portable and efficient alternative for hydraulic pumps that doens't use electric motors, combustion engines or piezoelectric actuators. The ...
Fulano's user avatar
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Best pump for hot milk (Self priming)

I am currently in the process of building a machine that can make tea(in a saucepan). I have almost finalized everything, but am having trouble selecting what pump to use. I read the following ...
abdullah mohsin's user avatar
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1 answer
56 views

Where should I restrict the flow of a pump?

I am using a 1/2 hp sump pump to provide flood coolant to a CNC milling machine. The sump pump has a 1.5" outlet. The milling machine already has a 1/2" adapter and manifold which connect to ...
Maxthecat's user avatar
  • 113
1 vote
2 answers
162 views

Pump capacity calculation

I have a borewell dug in my farm and the depth of the borewell is around 195 feet. I have applied for a Solar pump subsidy and I am about to get the equipment with following details: 4.7kW solar ...
Raj Pawan Gumdal's user avatar
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0 answers
14 views

Pressure Boosting Pump Running Overcurrent

I'm working on an industrial water re-circulating system that is having an overcurrent issue that is baffling everyone involved (design engineer/plumber/electrician/pump and motor Mfg). The system ...
user2059972's user avatar
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93 views

Total dynamic head calculation of a submersible pump with different dia pipes connected to its discharge

I have to install a submersible pump for pumping ground water to irrigate land. I have six inch diameter metal pipe already available that I plan to use in the project. The pump delivery is 5 inches ...
Bilal Khan's user avatar
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48 views

How can I make sure that my outflow is the same as my inflow?

I have a basin that is 110 mm wide, 200 mm long, and 15 mm deep. The walls are 2 mm thick. It has water being pumped into it at a rate of 0.1078 gpm from one side. In order to ensure that this pan ...
Skuz's user avatar
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1 answer
46 views

Specifying Pump Max RPM

I am reviewing specifications that indicate: "Pump Maximum Speed, RPM (Estimated, manufacturer to recommend): 187". Another paragraph later on indicates the following: "Rotative speed ...
Adrian Beltran's user avatar
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37 views

Estimate cycle of the pump per day

I have a pump system that is on for 5 days. For the entire 5 days, there are 3 days that the pump system is able to complete on and off cycle. I want to estimate the cycle of the pump (on/off) per day?...
Ponlok Peter's user avatar
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23 views

Is it a good idea to limit speed of one motor of twin motor diaphragm pump?

I have the below 12V pump. It is a common garden spray pump, China made, no datasheet. The thing is this, it is supposed to be a suction pump, but once upon a time, long back, I connected the inlet ...
John Snow's user avatar
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17 views

Split tubing assembly

I am designing a tubing (TPE) assembly that splits a single inlet line into either four or eight outlet lines. The goal is to achieve an approximately equal flow rate of mildly viscous liquid at each ...
biobuddy39's user avatar
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3 answers
117 views

Why are my water pumps becoming noisy all of a sudden

I purchased 3 identical submersible water pumps for my irrigation mister heads. Im running them in clear tap water at room temperature(blockages are not a concern) After running one for 30 hours, the ...
David jones's user avatar
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2 answers
82 views

What is the name for this style of "bellows" water pump?

I recently bought this old "bellows" style water pump and would like to find spare parts for it - there is no nameplate or model number, and I don't even know what to call this sort of pump ...
Jan Martin's user avatar
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0 answers
58 views

Suction hose or regular PVC hose?

I had a liquid filling machine to which on the suction side I had applied regular PVC hose Some time back I had a problem that after some use the hose was beginning to breathe air. How do I know it ...
John Snow's user avatar
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1 vote
1 answer
458 views

Can a fully submerged submersible pump become air locked?

At a place I'm staying, there is a borewell whose design and construction I ignore and I have no means to figure out (total depth, cap etc.) The entire house runs on a limited electrical supply from ...
geeheeb's user avatar
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1 vote
0 answers
103 views

How do centrifugal pumps connected in series increase head?

I've read that if you connect two identical centrifugal pumps one after another, the head of this system would be twice the head of a single pump. I have some difficulties understanding the processes ...
Usurer's user avatar
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1 answer
27 views

How is flowrate generated by a pump related to it's supply?

Let's imagine this situation https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTxrzyl_E9ig49eoN3MRO4EvmTI30cJ-BwTyA&usqp=CAU There is some hydrostatic pressure in the supply tank which causes ...
user1477107's user avatar
2 votes
0 answers
100 views

Meaning of Pump Max Lift

I am looking at grabbing a small submersible pump to recirculate some cleaning solution in a toilet for about 24 hours or and I was looking at the following pump. The spec says max lift 3'. Now my ...
Forward Ed's user avatar
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123 views

Is a diaphragm pump good for pumping liquid soap?

Can a double motor diaphragm pump be used for continuous pumping of liquid soap? Can it take it?
DribbleNibble's user avatar
0 votes
1 answer
30 views

"reversing pump" in closed water circuit, can water pumped reach further than wave length?

In a closed water circuit with a reversing pump. If the wavelength of how far water pressure wave (positive and negative) reaches during one pump/suction cycle is much shorter than the length of the ...
Johan's user avatar
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1 vote
0 answers
41 views

What happens when running a piston pump below minimum air drive?

My question is what happens when you give an air driven liquid piston pump less air drive pressure then the minimum recommended. I have a pump that says its minimum drive pressure is 25psi. What would ...
Amar Ljubovic's user avatar
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2 answers
211 views

Would connecting a small hydraulic pump to a larger hydraulic motor result in force multiplication?

In a hydrostatic transmission system, hydraulic pumps drive hydraulic motors (basically a reverse pump). If you were use a smaller hydraulic pump as an input and a bigger hydraulic motor as the ...
Fulano's user avatar
  • 51
1 vote
1 answer
70 views

How long it takes to fill an inflatable to a certain pressure?

I am trying to figure out the inflation/how to calculate the time it takes to fill something to a certain pressure. I have an inflatable dock I am filling with a portable pump. The dock is 7ft x 7ft x ...
nk13's user avatar
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0 votes
1 answer
42 views

shaft connected double water wheel to lift water back in closed loop

This is meant for mechanical closed system for hydroponics. Two wheels connected by same shaft so the wheel going down lifts the water back with the other interconnected wheel to a slight incline. I ...
Rodríguez Ayoze's user avatar
1 vote
1 answer
90 views

Pumped storage hydropower, how to power the pumps?

Regarding pumped storage hydropower, In the case of some high altitude upper reservoir that feeds several turbines located at the bottom of a valley, where there's a lower reservoir too. Assuming in ...
user avatar
0 votes
1 answer
49 views

Is there a way of find the ideal balance between pressure and fluid flow in a hydraulic system?

So, I have 72 hydraulic McKibben actuators with 30cm in length and 14cm in width under 400 kPa (or 4 bar) that lifts a 5 ton weight that I want to actuate in a third of a second (continuously, ...
Fulano's user avatar
  • 51
0 votes
2 answers
61 views

Pumping machine (Centrifugal ) fails to pump

I have a centrifugal pumping machine that fails to pump up consistently. When powdered on, it spills up water, then stops and continues intermittently like that without a consistent flow of water out. ...
Apata John's user avatar
0 votes
1 answer
119 views

Would this large scale "bubble pump" actually work?

I have read about bubble pumps which work by heating water causing a phase change, the water passes through a one way valve and condenses thus pumping water. Would this work at a larger scale as in my ...
Jan Martin's user avatar
-1 votes
1 answer
529 views

How to build a hydraulic standing desk?

I am trying to build a standing desk but I want it to be wireless (aka - no electricity needed). My idea is: have 4 hydraulic pistons that extend (from 60 cm (25in) to 120 cm (50in)). They will be ...
Miro's user avatar
  • 99
0 votes
1 answer
153 views

Centrifugal Pumps Self Priming

A traditional centrifugal pump is unable to self prime, as the pressure differential between the suction and discharge lines when pumping the air is insufficient to lift the water any appreciable ...
Joeseph123's user avatar
0 votes
1 answer
81 views

Tips on searching for components?

I'm a mechatronics engineer, and a big part of my job is searching for the right off-the-shelf (mostly mechanical) component for a specific purpose. It can be anything from vacuum pumps, flow meters, ...
Achintya Agarwal's user avatar
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0 answers
81 views

Calculate pipe size and friction loss for an agricultural project's water system?

I'm in the process of designing a water system for our regenerative agricultural project in the Horn of Africa. I'm looking to install a ≈1000L water tank on a 3 meter stand which will gravity supply ...
Jonathan Ciccarone's user avatar
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0 answers
41 views

How to determine the efficacy and potential energy of hydro power energy storage?

The project I'm thinking about building a cheap DIY hydro energy storage (like a battery) system. I can build it but so far I can't really figure out the calculations to validate my idea and where to ...
Bob Ortiz's user avatar
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1 vote
1 answer
157 views

How to prevent ping pong balls from clogging the entrance to a tube they must be able to individually pass through

We have a claw machine that grabs a bunch ping pong balls that then drops them onto an incline that leads them to a 2 inch in diameter pvc pipe that they must all fall through. The issue is that when ...
Amy's user avatar
  • 113
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0 answers
168 views

How this centrifugal pump works in creating a vacuum?

Stumbled upon this video (vacuum fryer commercial) It obviously using 2 centrifugal pump (large ones, most likely above 700 litres/min) to circulate the water inside condenser But then, these pumps ...
mande's user avatar
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0 votes
1 answer
657 views

What does pressure rating of pumps mean?

So I am thinking of purchasing a double motor pump for higher flow rates. This pump is available in two pressure ratings, 150PSI and 220PSI. What does it mean? I read that it means how much resistance ...
DribbleNibble's user avatar
2 votes
2 answers
81 views

Varying flow through Centrifugal pump

A centrifugal pump is used to pump fluid from one reservoir to another with varying pump speeds (Using a variable frequency drive). The system looks something like this The pump performance curve (QH)...
Nil's user avatar
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-1 votes
1 answer
281 views

Clockwise vs. counter-clockwise rotation, usage of terms with complex machinery as with pumps and motors

This question might be considered off-topic, because it will elicit opinions. However, I think it is somehow important to know about unwritten agreements, so I give it a try. I know that the direction ...
Ariser's user avatar
  • 363
0 votes
2 answers
67 views

Water pump's output going down

So I have a submersible pump (Which I do not use submerged but just connect hose to both ends) who's output is consistently falling. While guessing for the causes I am tempted to blame one instance ...
DribbleNibble's user avatar
0 votes
1 answer
156 views

Centrifugal pump head-flow prediction with CFD

Given a volute pump casing, the impeller, and RPM how would one obtain a simulated head-flow graph? As for what I have seen in research papers most methods already assume input flowrate / pressure and ...
jessegerritsen's user avatar
2 votes
0 answers
34 views

Why does pressure regulator on garden hose jump from 60PSI to 135PSI when pressure washer sits idle for a couple of minutes after use?

There's a pressure regulator on our garden hose spigot. When the valve is opened with the hose nozzle closed, it reads 60psi. I attach the garden hose to a 2700psi electric pressure washer. After ...
Tim's user avatar
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