Do Pumps Create Pressure or Flow?
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- čas přidán 15. 06. 2024
- Explaining how pumps produce both pressure and flow with some fun water demonstrations.
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There’s a popular and persistent saying that pumps only create flow in a fluid, and resistance to that flow is what creates the pressure in a pipe. This video goes into some details about how two kinds of pumps work: centrifugal pumps and positive displacement pumps.
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💧 Give me your best pump mantras. I'll meditate on the best one.
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Pumps are just power supply's for water circuits.
Pumps propagate proper pressure via fluidic formulation of flow.
AHHH EHHH PUSH IT... PUSH IT REAL GOOD!
Pumps create whichever one your system allows
"Pumps create pressure, outlets convert pressure difference to flow."
Most pumps work via a mass pushing against water. At the point of interaction, this is without a doubt pressure. It is only because there is an outlet that the water can move out the way and become flow.
A good rule of thumb is: "If you want an accurate one-liner saying, don`t get involved in hydrodynamics".
A good one liner in itself
or electronics.
@@Garbaz I think this one-liner can be generalized over all dynamic systems.
@@asmodeusz28 All nonlinear* dynamical systems
It can be shortened to: "If you want an accurate one-liner saying, don't get involved."
This video operates where my interest curve and the supply curve intersect.
@Jeffrey Long that's only important for youtube itself, no one cares about it
I think you mean interest curve and attention curve intersect.
@@calholli I think he might be just be saying that he likes this content, it’s both interesting and available or supplied to him. Also, isn’t interest and attention about the same in this context, if something has your attention then it must have your interest or vice versa? Lol just speculating
@Jeffrey Long I think that interest is his demand curve. He is interested in this content ergo he has created a demand for it. Then the supply is this video. Just trying to overthink this, no more than a theory of his message’s meaning haha
Well done.
As a professional engineer who worked at a water and waste-water utility for over 30 years, let me congratulate you for an excellent presentation. I would really like to see a future presentation on cavitation.
He did one on turbulence before I think. But obviously that's more general and not pump specific.
He has a couple vids on cavitation too
Its an interesting concept its it
a little late, but it was just beside your comment... it's a sign :D
czcams.com/video/zCE26J0cYWA/video.html
I worked at a processing plant with very precise dosing needs, I would too love to see a presentation on pump cavitation. We saw a lot of busted welds on the suction side of pumps, being where I am now I'd love to see an "outsiders" view on why/how this could happen.
"This isn't rocket science". I'm not a rocket surgeon, but I'm pretty sure pumps and fluid dynamics are a big part of at least designing rocket engines and fuel tanks.
i heard a professor once say "come on guys, this isnt rocket science... though it is USED in rocket science"
Designing a good efficient turbo pump is like 30% of the engineering going into a rocket.
Rocket engines are all about pumps and turbines
I work and design pumps, in line pumps, all different kinds of chillers, VRF systems and some of the hardest electronic plc diagnostics you can do. I quit school when I was 15 never finished and now I easily make 6 figures a year.
@@forloop7713 Reaction engine leaves the room
It actually is rocket science too. The big boy rockets all use pumps for propellant flow and thrust control :)) 0:32
Was going to add how do pumps/fans apply to air? As dad was fond of saying "air is a fluid".
Yeah and turbopumps are one of the most expensive and complex part of the rocket (admittedly more the turbine than the pump but still...)
Yeah. What made V2 (/A-4) possible was it being the first turbo pump powered rocket. Development of rockets was very much development of pumps.
One of the major descriptors of rockets is their turbo pump cycle and turbo pump burner mixture. open cycle, closed cycle, oxygen rich staged, fuel rich staged, full flow staged and so on. It is all pretty much about "what is powering the turbo pump necessary to feed the combustion chamber with enough combustibles". Actually add pump or pumps? Again another major "rocket pump" thing. Do Single pump or do two independent pumps?
@@quintessenceSL I'm thinking of that too but, isn't that is a compressor?
Really?
"Not a great catchphrase, but it _is_ accurate." Spoken like a true engineer.
That also happens in physics
@@altuber99_athlete This reminds me of the SMBC comic with the evil villain ranting that he's "actually doing something" when the hero calls his work "pure evil."
Technically correct...the best kind of correct
@Qimodis Can you share an example? I'm not saying otherwise, though. I was just saying that physicists (and mathematicians) are also rigorous with definitions.
@@gasfiltered Its actually technically incorrect. If you understand ohm's law, think of pressure as the "ohms" of a system; Pumps don't create pressure-- because pressure is actually measuring the "resistance" of flow. The "current" is flow, and the "voltage" would be the capacity rating of your pump. The bigger the pump, the more potential for flow, the more it is resisted, the higher the pressure. Once you look at it that way, its easier to see how pressure is actually on the other side of the equation.
As a retired mechanical engineer, indeed pump selection for industrial applications is far from a simple task. Great video
As an aspiring mechanical engineer, I can say it hasn't gotten easier despite all the computational advances in the industry and education. 😆
Even though this is aimed a lot more at civil engineering concepts, for me who is studying chemical engineering, this channel is so informative to conceptualize and understand physical setups of a bunch of engineering concepts.
Thank you for the content!
i need that on a tshirt asap!
I've never seen you in a t-shirt!
Maybe you are better of with a pair of golves?
Yeah we can't see your shirt so left and right gloves should do the trick
@@PracticalEngineeringChannel monogrammed dress shirt?
Lol advertising
I'm an electrician. Everytime I hear it's not the voltage that kills you, it's the current, I slap them in the face and tell them it wasn't the velocity of my hand that hurt them, but the weight of it. Of course the real answer is it's the MOMENTUM of the hand i.e POWER that hurts you.
Next time someone says that just zap them with static and ask how they survived being shocked with tens of thousands of volts. I've laid fingers across a 225W piezo driver output before. The Dorito's looking spot on my fingers also smelled like Doritos. ~25kHz ~36V ~6A is wicked and I really didn't expect it.
Kind of gets into the weeds of what is a voltage source and what is a current source. Would be interesting to know actually what average voltage across the body is associated with the fatal 2mA of current through the heart though.
it only takes 1/10th of one amp across your heart " right hand to left foot for example " it is the amps that kill you.. you forgot the 3rd item in ohm's law " resistance". making it possible to take 50,000 volts of electricity from a police taser without dieing, in fact that 50k volts can be maintained by a police taser up to 5 seconds.. yet to person lives just fine no permanent damage. in the end it IS the amps that Kill you not the voltage...
@@earache294
You couldn't be more wrong. That 50kV is the free-air measurement. Tasers cannot supply more than a very limited current so as soon as the circuit is loaded, i.e. by someones body, the voltage drops to a much lower voltage following ohms law.
If a taser could sustain 50kV even under skin load there would be around 50A flowing. That just doesn't happen.
@@earache294 that's a slap in the face for you. The proper answer to the age old question of is it current or potential that kill you is; YES. These are two measures of one thing; the electromagnetic force. Trying to talk about them as mutually exclusive entities is incredibly pointless.
Your new vs old pump mantra is like the "money doesn't buy happiness" one. I revised that phrase to say "money can't directly purchase happiness or friends because they aren't purchasable items, but it can however make your life easier and facilitate many things that do make you happy and will overall improve your happiness versus your position if you didn't have it."
Money can't buy happiness, but it makes being miserable easier to tolerate.
@@joeespo177 Like I said. Happiness is not a purchasable quantity. However, theres not a single person on this world who would rather be miserable and poor over miserable and rich.
Can we get that on a t shirt?
Broadly speaking, I like say "money can't add happiness, but it can subtract unhappiness, and sometimes that's good enough".
“Internet pump enthusiast” - cracked me up!!
This is basically the hydraulic version of the discussion whether an electric source provides current or voltage. And as my university teacher likes to say: "what they have taught you in school might not be wrong, but the full story is a lot more complicated".
I would guess it depends on the natures of the source and the load. ;)
I was about to make the same comment. The correct answer is to ask which exists without a circuit. Voltage/pressure always exists. Flow only occurs when a path to release the pressure is provided. Flow varies depending on resistance. Pumps create pressure. Flow is a byproduct and function of the connected circuit.
It's necessary to create a simple model with which to begin instruction; otherwise, you'd never get to a full understanding. The real world is always more complex then people's simple models of the world.
@@solventtrapdotcom6676 i think this is a really good way to put it
@@nc7432 Because it comes from decades of experience. ;-)
I work for a pump company, and I want to show this to all our customers who I swear don't understand pumps. Well done. I look forward to your future pump videos!
I work for a company that uses pumps and I can see where you are coming from. As an operator we often see incorrect pumps for applications, often due to plant upgrades or changes.
Often there are such administrative impediments to making a change that engineers just persist with what is in place
And budgets...
I feel your pain. I'm also a pump technician. My favorite question wothba new pump installation is "will this give me more pressure?" -Well not if your have the same pressure switch or transducer setpoint- happens once a week.
I'm a pump designer and I'm showing this to new engineers as part 1 of onboarding.
i work for a mechanical seal manufacturer, even less understood...feel your pain lol
@@midship_nc From the pump engineer: your work is appreciated.
Rewatching this video after measuring I-V curves for lots of small solar panels is really making the similarities between water and electricity stand out. Photovoltaic output is incredibly load-dependant (that's why we use MPPT controllers for all but the most basic solar setups) and the curve describing the output naturally looks a lot like the pressure vs flow rate graphs you showed of the pumps.
Boy do I wish we had an engineer like you, 20 years ago. I was an electrician that seemed to have absorbed/dumped into the water system where I worked. (Now retired) They had 4 vertical 1000 gallon / minute Deming pumps that outputted through 8” ID pipe, into a 14” header/collector pipe, sending water from a settling pond, ¼ mile back to the main plant. They kept adding more and more equipment, that needed cooling water, so the engineer kept adding pumps. No matter what he did, the pressure and the volume, ¼ mile away never increased. (Eventually up to 8 pumps) I tried to show him the folly of forcing more water through that same 14” pipe was futile, with an impeller driven pump, but the engineer looked at me as if I was a moron, till he finally got to see the amperage going down on each pump motor as other pumps were manually turned on. (Took 4 clamp-on's at once to visualize it)
If you would, show how an ammeter is a good tool to check and set up pumps, check wear on impellers, and the need to set the pumps at 100% load (rather than 70-80%), to get the best balance out of multiple pump systems. Some of the newer people to the field would benefit. Most people see pump curves, and just shrug their shoulders. Setting them up is fascinating though, especially when the mechanic foreman comes to you, with his budget for the year, and asks, which pump is showing the least efficiency, and you can show him with an ammeter, and a pressure gauges, which impellers are wearing the most, in parallel multi-pump systems. I’d be glad to feed you my notes, but it sounds like you have all you need.
Thanks,
Mike
Its like the argument, "its not the fall that kills you, its the sudden stop at the end"
Its not the fall, its the wife who pushed you.
This may be a fun comment, but it isn't the same. The sudden velocity change is exactly kills you and other objects. So your phrase is actually perfectly accurate. The fall itself is irrelevant to the impact, as it isn't what accelerates you are deccelerates you. Rockets in orbit are falling around the body they are orbiting, yet they gained their velocity by firing their engines.
@@whiteerdydude Like for most words and phrases there are a scientific definition and an everyday definition(by exemplification). "a fall" is normally understood as the event including losing your anchoring point, falling and landing. So yes - that event can most definitely kill you.
@@hpekristiansen thehoovah seperated the fall and impact in the figure of speech, so that point is not a valid defense of the phrase semantically speaking.
@@whiteerdydude Well it isn't the sudden velocity change that kills you, it is that different parts of your body under go the sudden velocity change at different rates.
If the rapid change in velocity was applied to all atoms in your body equally at the same time, you wouldn't be hurt by the rapid velocity change.
When I was in college I understood it as, pumps create pressure which gives fluid energy, difference in pressure causes velocity/flow.
Just like a net positive force creates acceleration, not the other way around.
For gas right? But fluids I thought weren’t compressible.
@@eswing2153 everything is compressible, even fluids and solids. They just need a lot more pressure to compress in comparison to gases. And fluids under pressure also store a bit of energy by expanding their containers.
Yep. Nature seeks equilibrium, and we provide power in one form to create energy gradients to drive a flow that can be used for something else.
@@eswing2153 a fluid is just a substance that flows and takes the shape of its container, gasses and liquids are fluids. In some cases solids are fluids as well.
I’m a certified fluid power hydraulic specialist (CFPHS), and I really liked how you tackled this topic. Definitely showing it to my friends
It really coupled to me
This was a really great video, thanks! Loved the graphs!
@gioyu comi Long story short, for the motor it's because of eddy currents.
For the motor it has to do with the design of the motor. A motor has an ideal operating range. If the motor is spinning too slow, you're not getting bang for your buck (low flow rate). Too fast, and the fields generated by the motor start to interfere with eachother (eddy currents) and its efficiency goes down... so the idea is to get the correct size motor. If you get too big or too small a motor, you strain the motor and make it inefficient. Good electricity goes to waste if you don't select the correct motor... so it's good on your electric bill as well to find the perfect motor.
In regard to the system curve, I think it's because the pressure drop due to friction in the pipe isn't linear. Watch his other vid on pressure and flow. He's got a part with the hazen williams equation.
As a chemical engineer that works with pumps on a regular basis, I enjoyed this.
As a chem eng grad I agree
Stranger on the internet is happy for you
As another engineer, I feel the need to tell everyone that I am also an engineer.
another engineer here i work in boosting station " compression 5002D turbines
"this is the first of 2 videos... let me know if you want to see more". Grady, i'd watch a video on anything that you passionately explain. You explain complex topics simply with great demonstrations. Any subject is interesting in your videos. Keep up the great work.
Honestly he could narrate paint drying, and talk about how the chemical changes to paint drying, and it would be interesting.
Same. I have absolutely no practical use for anything he explains but I still watch all his videos because it's so interesting.
Excellent video. It would have been nice to have this kind of thing when I was in college for civil engineering. Fluid mechanics was one of the harder classes for me to grasp. I doubt current students recognize how blessed they are to have access to content like this, bridging the gap between the academic concepts and how they manifest is reality. How about this for a catch phrase: "pumps don't create anything, but rather transfer energy into the system, which manifests in the form of flow and/or pressure".
Unfortunately they dont realize how Lucky they are
I worked for town councils doing water reticulation and sewerage for 30 years, your presentation is perfect.
“Do pumps create pressure or flow?”
“Yes.”
they pump XD
they create pressure. then the fluid responds to that pressure by flowing.
@@mrxmry3264 exactly this. Like how a battery creates a voltage differential in a circuit, a pump creates a pressure differential. Fluid in the high pressure side will need to move to the low pressure side but the pump prevents it from going backwards, so it must move through the system first.
@@joshuaklein8429 correct.
By saying yes that is technically a sound answer.
I enjoy doing it too, eg if someone asks me if I like red or blue, I say yes
"Here in my garage", just bought this new pump, it's really fun accelerating liquid into the discharge line. But you know what I like more than the physics of pumps? Performance.
Had a long, confused discussion over lunch one day with a friend who needed to pump water into a very high reservoir, and was trying to arrange multiple pumps. This clarifies the whole problem.
Awesome video! I am a project engineer for a large diameter(54” into 92”) sewer project where we bypass 30MGD. I just went through learning all this and this video does a great job simplifying a complicated topic.
"Pumps be like: here have this fluid, unless it's too much trouble..."
0:21 Mehdi: "THANK YOU!!!"
LOL...
Lol, I know Grady was there. 😂
And now I want a collab
Yes
😎 The Rectified Group 🔥
As a mechanical engineer in a food plant who's currently working on replacing cooling tower 20yrs old circulation pumps (6 pumps, each of 750m3/h, 132kw) with new energy efficient pumps. Really enjoyed the video! Good job!
I’ve had a lot of friends who are engineers, i myself am a mechanic, and I always smile when i see Grady puts little eyeballs on the action pieces knowing full well how special it is for an engineer to humanize things for the rest of us emotional non-Vulcans. It’s a special breed who can bridge that gap. 🖖🏽
And amazing how much of a difference they make! 👀
Yeah that's actually really cool and helpful
As a HVAC/R tradesman, I meet lots of people who don’t understand this. Engineers and tradesman. I don’t fully understand it yet but that’s why I’m here!
Heart and blood vessels work the same way. Narrow blood vessels create high blood pressure.
People who don't know talking to people who don't know creates great confusion. Also the one who has the loudest voice but knows the least always seems to have the greatest ability to transfer their knowledge and confusion.
In 10 mins you explained how characteristic & system curves interact better than any text book I was ever shown. As a HVAC engineer who deals with centrifugal pumps quite often, I wish I saw this video during uni. Could've saved me a lot of time...
HVAC engineer here too. Totally sending this to my Jr engineers.
Retired HVAC guy here. Thanks for the great explanation, Grady.
Love this channel. The insightful content, informative experiments, and smooth delivery. Hard to beat.
8:23 the excitement in his face and voice when he gave us the catchphrase
that composite video of the three beakers was great :)
Reminds me too much of Electroboom's mantra on voltage vs. current: "It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that indicates how much hurting you shall receive, because a touched supply voltage may drop if its current is somehow limited."
@soiung toiue I think that it's something like "it's not the speed that kills you. It's the sudden stop". And also, from the Discworld books "I don't fear heights. I fear the depths below them."
Well done! As someone who does TIC for fire pumps, this was incredibly well put together. You probably know more than I do about the topic, but I have lots of experience with pumps if you want to reach out for any info!
Seriously one of the best channels on CZcams with easy to digest videos that are concise and very well made. Thank you sir.
"Let me know if - . . ."
The answer is yes, Brady. The answer will always be, "Yes. We do want to know more. Please, be as in depth as possible."
Edit:
Oh! Do come and join the argument over pressure vs flow below. It will help the channel's engagement.
Very true
I thought his name is Grady
THIS^
@@ubersham It is.
But he's wrong... If you understand ohm's law, think of pressure as the "ohms" of a system; Pumps don't create pressure-- because pressure is actually measuring the "resistance" of flow. The "current" is flow, and the "voltage" would be the capacity rating of your pump. The bigger the pump, the more potential for flow, the more it is resisted, the higher the pressure. Once you look at it that way, its easier to see how pressure is actually on the other side of the equation.
I must be pumped for this video because there was 0 resistance from me.
ba dum tsss
No pressure on releasing the second video from me, either.
And the puns start flowing.....!
@@gus473 But the pressure to find another pun increases over time, and the flow decreases accordingly.
So no head?
PLEASE MAKE MORE THAN 2 PUMP VIDEOS GRADY
'Chemical engineer' - such a vague title.
What is the difficulty in selecting a pump ?
I just wanted to say I've discovered this channel somewhat recently, and I'm in love with it. Teachers could learn a lot from Mr Engineering's (I'm assuming his name is Grady Engineering) way of explaining core concepts without relying on cumbersome maths.
"pumps impart flow and pressure to a fluid in accordance with their characteristic curve and the corresponding system curve."
great mantra. will meditate on that
2:53 “And now through the magic of buying 3 of them!” -TC
I immediately thought of Alec too.
Can we take a moment to pay respects to the sheer amount of time and money spent on these models to demonstrate the concepts in these videos? They are part of the reason I love this channel so much.
Man you just nailed it. YOUR CHANNEL DESERVED THE NAME YOU HAVE GIVEN TO IT
Brings me back to my WW plant managing days. In a small town, we all had to think like engineers because the city was too cheap to pay for a real one. Every time I had the chance to talk to an engineer, I would soak it up.
"Do pumps create pressure or flow?"
"Yes."
"Yesn't."
They also pump moonrock gel, Blue bouncy goo, and superfast orange hydrocarbons. May contain traces of TimeTravel, forward and backward.
Another excellent and educational video. In addition to your first class production quality, I’ve been enjoying the topics you cover. This particular video was on great interest to me as I’ve been playing with pumps since a small boy when I first watched my dad repair a 1958 pedestal sump pump in our basement.
I would love more videos on pumps, because I adore hearing people talk about topics they're passionate about.
"Let me know if you want to see more"
I'd love to see more!
Seriously, your channel is one of my favorites.
That graph at 3:20 is amazing no longer does anyone need to convert the units I love it!
If only such a scale was used in industry.
Most of us don’t have to convert because we a smart enough to use metric instead of the system that was invented by people who married their own cousins.
Cool presentation. Learned a few things today. Thanks
As a plumber I really appreciate this video. You opened my eyes to new ideas, and I love pumps too. I work with hydronic pumps so we go for efficiency and longevity rather than high flow or head. There are issues however with placement that can impede or enhance cavitation and also entrapped air removal through traps or high points. Thanks again for all these great videos!
Hi, I work in an refinery and work with pumps, turbines and compressors every day.
You made a very good video, couldnt explain it better :)
The simile at the end of the video is so genuine. I LOVE IT!
would love to see a video covering impeller pumps. I worked at a valve shop where the serviced crude oil pumps and they used impellers to "pull" the fluid though. the multi stage versions also did a "crossover" so the pumps impellers pushed or pulled on each other instead of generating a huge thrust load to one side. might be an interesting episode.
More pump videos!
Any video topic you're passionate about is a video I'll enjoy watching! Your passion and interest comes through so much on these videos.
Honestly, who dislikes a video that’s completely educational? Outrageous
Usually a person with religious or conservative convictions or both ;)
@@SonsOfLorgar “you can’t know that because GAWD”
Probably people who don't like his delivery. I didn't really enjoy the video, but I wouldn't go as far as giving it a thumbs down.
@@SonsOfLorgar i like the irony of wild guessing here
It's educational but not the best quality. He doesn't actually explain that much, just says "pumps are more complicated than you thought" in a long winded way. He shows the characteristic curves, but doesn't attempt to explain why they have the shape that they do. The conclusion is literally just "the flow rate depends on the whole system, not just the pump".
As always - thanks for the quality infotainment! Love the content!!!
Excellent explanation - Thanks!
Really classy break with the fountain with your melody in the background. So grounding... such soothing... many subscribe.
I am pumped!
I build fire foam gear pumps for a living. Great video.
As a commercial pool tech, this was wonderful information. Thank you!!
I thought immediately of the popular (and less than correct) voltage/current saying that you mentioned when I saw the title. Excited to learn more about pumps in this video!
Nice video! I hope your next video about pumps includes something about pump cavitation!
Very nicely done: you have a talent of making complex topics easy to understand.
There is one complication more: positive displacement pumps which make use of elastic elements (diaphragm, persitaltic etc..) will also provide different flows at different pressures; for some the difference will be tiny, for others quite significant.
I'm an engineer in a pump repair shop and make and fit mechanical seals to them, this video was fantastic.
Plus to prove pumps do create pressure, it's in their design, the volute has that spiral shape that once the product has been moved off the impeller eye to the walls of the volute it follows this spiral to the discharge and as the volute opens up the fluid builds up and loses flow and builds pressure before leaving the discharge, which is why the suction always larger than the discharge, to create pressure.
Great video Grady, your content always consolidates what I learn in class but you deliver it with much more enthusiasm which not only makes it more interesting, but helps my understanding of topics so much
I was literally searching your channel yesterday for this video and it didn't exist yet. Thank you sir!
You should say: "Pumps impart energy on the fluid they interact with."
More urban planners need to watch this. Your video describes every day for me while I design wet pipe fire sprinkler systems balancing water flow from the public utilities against what is required to drive the sprinkler system. One other fun fact for pumps is that the less water you have to work with, the less pump you need to add the required flow. Adding a bigger pump to a system with marginal pressure makes for frustrating calculations! Thanks for the video 👍🏻
Nice to hear a presenter with good diction and memorable presentation techniques.
Grady, it’s like the old saying
Build it and they will come.
Upload it and I’ll watch.
Edit- and give it a thumbs up. Lol
And there you've just hit on another hot button issue. Does demand get supply or does supply get demand?
@@tomr6955 The whole concept either way is kinda outdated and too simplistic to be genuinely descriptive of reality
@@Nosirrbro wrong. What device are you using right now ?
@@tomr6955 supply TRIES to meet demand
What a wonderful video. I've only recently learned to think about pumps and fans correctly, this was a great way to describe their operation.
Great video, thank you! Now I understand better the displacement pumps
It’s not the failing of the parachute to open that kills you. It’s the hitting the ground at a high rate of speed.
"If your parachute fails, you have your whole life to figure it out."
"Guns don't kill people, people kill people!"
@@diggymgee loss of blood pressure kills people
Geez Grady... I wish you would've posted this video 2 days ago. I just submitted my capstone project designing a pump system and I could've used this :D
Awesome video, well presented, thanks so much for sharing this with all of us!
I worked for 7 years in the activity of pitometry in water supply pump stations, using ultrasonic flowmeters, analyzing the behavior of flows and pressures and their relationship with the water levels of the well and aquifer, and that was an amazing experience for me, personally besides the dam inspectios is one of my favorite works in hydraulic engineering. Sometimes the sound of the pump motor says you that something is going wrong, in some cases because the pumps work "out of parameters" (with the curve displaced from the optimal operating range), and that's something that often is not taking in account, the correct selection of the pump according the needs of the system.
I've been working towards my distribution four water license and my collections 3 license and these videos have really helped me
For or four?
@@isbcornbinder four
"Internet pump enthusiast"
...yes, there are a lot of those out there XD
I think we are the wrong video site for that though
@@timseguine2 You might be surprised.
Thank you for adding metric to your graphs. It's very helpful :)
Thank you for the informative video. I worked years for a plant in which we did not have a clear understanding of what pumps are capable of. We had to move 10,000 gpm of a slurry containing a crystal formation that centrifugal pumps were hard on. Plus, before we discovered mechanical seals, we were pumping 500 gpm of diluting water into the packing glands, We were burdened with having to repair packing and replacing ballraces on a crippling frequency. At the end of my time at that plant, we had new minds coming on who introduced us to eddy pumps, which changed things . I wish we had youtube and videos like yours to teach us these things back then.
Pumps impart energy/work. That is expressed as both flow and pressure in different parts of the fluid path.
I think part of the confusion might come from the conflation with discussions of incompressible and compressible fluids. Water is taught as incompressible, which is practically true and so people jump to the idea that a build up of pressure can't be what is occurring. Which is ironic since hydraulic pressure is probably an intuitive concept until they start studying fluids at a college level. Just goes to show how diverse and confusing the subject can be at first when you're learning about different aspects instead of thinking about it as an integrated whole.
Totally agree, the Bernoulli eq (assuming simplified models) says that pressure, head, and flow are all basically the same and interchangeable. It’s just conservation of work and energy.
"It's not the volts that kills you, it's the amps - the voltage just assists in determining how effectively those amps are in fact killing you"
No but the voltage determines the Current that is running through your boody as long as the power supply can deliver the current while the current is also determined by your bodys resistance.
It's not the volts that kills you, it's ignorance.
@@7784000 But still the fact remains the voltage determines the current that flows. Of course, the voltage can and absolutely will change if connections within the circuit change as this will disrupt the distribution of charges within the circuit. Sure this will be more noticeable if the sink being added or removed is large compared to the sources within the circuit. This is of course why voltage will drop sharply if the charge is being provided by a relatively limited source compared to how much current is able to flow through the new sink as the source simply cannot maintain the charge at that rate of charge dissipation.
Not exactly, the voltage determines how many amps are killing you.
Brilliantly explained. Always love your videos. Left feeling very satisfied. Amazing work
Excellent and accurate presentation of facts involving rotodynamic and positive displacement pumps. Congratulations and cheers!
Pump as an active element of pipes system provides delivery of the mechanical energy (with respect to time - power) to the fluid which is given as Q•H (for one unit of the specific weight of the fluid). Centrifugal pump was considered in the video thus shape or geometry of the impeller/rotor is strictly associated with its specific speed coefficient (kinematic or dynamic). These types of machines increase kinetic energy of the fluid (also momentum) when non zero net torque is acting on the shaft - see Euler's equation... then most of the kinetic energy is converted into potential energy (geometric elevation & static pressure) as diameter of outlet increases. Total head is a function of discharge H(Q). Briefly speaking, pump is an active source of energy for fluid and pipes as passive elements consume it (dissipation). Thus, actual resistance of pipes (throttling, roughness, length, diameter, elbows...) determine flow rate for a given source of the energy - pump (related to rpm). Thinking in terms of the energy and conservation laws is always usefull
Cool! Do positive displacement pumps next? Or if you REALLY want to have fun trying to figure out what category to put it in, look at a Disc Pump from Discflo. Great way to instigate a class-wide argument in any fluid dynamics or pump-related engineering class.
Edit: If you want to borrow a couple, I've got a few types of positive displacement pumps that I can drop off in your garage. Also know some folks who have clear cut-away (working!) progressive cavity, rotary lobe and maybe other types of positive displacement pumps if you wanted to do a video on different types.
Excellent visuals - the beakers at different heights does a great job showing the varied pressure
I spent almost 20 years as a mechanical engineer at various pump manufacturing companies designing/developing centrifugal pumps for the water/wastewater and chemical processing industries. This video was a great primer for people getting started in understanding pumps and fluid transfer principals. Well done. Your civil engineering videos almost make me wish I'd studied that instead!
Hehe great "primer"
His "I love pumps" has some mad "I live refrigerators" energy XD
That's cos they be heat pumps ;)
5:52 that 45° pump bypass setup is genius.
Can you explain? I'm not sure the significance of what I'm looking at.
Most bypass paths use 90° corners which is terrible for efficiency and pressure drops, given the diameter of the pipe the contents are more than likely heavy and the less you need to steer the fluid the better.
@@a-aron2276 I see. That seems like quite an obvious solution, rather than something genius. Any particular reason it's not commonly done?
@@PerMortensen I haven't a clue, it could be standard practice for them it's just not something I've seen before. But I'm 27 so there's a lot I haven't seen yet. Besides doesn't everything seem obvious and logical when it's pointed out and explained?
@@a-aron2276 Yeah, that's a fair point.
I worked for a water utility for 38 years as a union millright Hackensack water , United water , SUEZ water , installation, repair, and maintenance, great video for people who do not know what pumps do ,the Engineers and my company constantly Installed pumps that did not perform as advertised
Great explanation. Thanks.