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The difference between water pressure and water flow | How Pipe Size Affects Water Flow
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- Опубліковано 14 сер 2024
- One of the most common misunderstood items is water pressure and water flow. Water pressure and water flow are closely related, and pipe size has a big influence on the two. In this video I describe the relationship between water pressure and water flow. I also do a visual demonstration showing the effects of pipe size and how selecting a smaller pipe diameter effects water flow rate coming out of the supply line.
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An ounce of practice worth a ton of theory. This is by far the most clear demonstration I have seen online. Clear the concept and reduce confusion by such a simple way. Good job.
thanks for your response....we deal with this alot
Who the fuck is confused nobody’s confused if the water is not coming out of our Fossett we want it fixed I don’t care if you call it low pressure low flow low rider I don’t give a fuck fix it
Just saw this video for the first time today. I gave it a thumbs up. I don't usually comment, thumbs up, or do any of that. Just a simple clear concise explanation and demonstration. No long intro, no useless information, no royalty-free music. I came here to learn about flow, pressure and pipe size, and that's exactly what happened, without all hype and nonsense. Extremely well done, sir!
You did a good job showing the difference between pressure and flow and flow between different size pipes. I think the ironic issue is that the people who complain probably still dont get it. I deal with similar issues explaining things. thanks for this video, It helped me.
I work at a hardware store in Australia. Most people get most concepts but sometimes they don't so I politely suggest getting a plumber etc.
Thank you so much for the extremely clear demonstration. You’ve cleared up a LOT of confusion with my water FLOW issues in my house with this simple video!
thanks for the video. I am messing around building an aquarium canister filter and I am trying to wrap my head around how to manipulate the diameter of my intake and outflow tubing in order to maximize the potential of my tiny little pump. I understand that my situation is beyond the scope of this simple demonstration however this video helped me to understand that if my intake tube diameter is greater than the outflow tube diameter than I will have more volume coming into my filter due to the larger pipe than the volume exiting my filter which uses a thinner diameter pipe. The result being that my litle pump will have an easier time battling the head pressure as it supplies my aquarium in the outflow line because there is an abundance of water coming in. --- my situation reminds me of a brake master cylinder with its larger diameter booster that creates significant pressure down the line in the much smaller brake lines. this is the only video on UA-cam that I have found that even attempts to explain the differences that pipe diameter makes on water pressure and flow. THank you
Thank you for your explanation! Sorry people feel the need to be jerks in comments. It's nice to have someone explain in terms that people can understand.
lol it doesn't bother me just comes with the territory. i welcome all comments
Really a good explanation. I learnt a lot from this small experiment.
I am from India, working in water supply sector.
That is one hell of a southern accent, yeeeeehaww!
Rob p 😂🤣😂
Hey now don't make me call bobby boucher
F**** me thats the first thing I thought as well 😂😂😂 Greetings from London, nice video mate
it seems like "The ballad of buster scruggs" is explaining the flow rate and pressure. video is very informative. Thanks
One of the smartest Video I have seen on UA-cam in a very long time. This guy is dead on. Thank You
You are exactly right. I have been mis-stating pressure when it is flow rate not making it to the top floor shower. Thank you Sir.
Great demonstration. Trying to get my staff to understand this concept but really need a visualization for them, this is very helpful. Thank you so much.
Yow this is mind blowing omg, this is the best demo of water pressure and water flow with respect to pipe sizing, I wish I had found this earlier. We studied this in school and I had trouble understanding this simple principle. Thank you very much!
This guy is exactly right. The quarter inch pipe pipe has more velocity but less volume than the three-quarter inch pipe....
So going to a smaller pipe for a couple inches (like the sink is smaller diameter) but then back to big doesn't make a huge difference to the flow if the majority of the pipe is bigger? I'm thinking about from my irrigation pump where pipe joins sometimes the coupler ID is smaller than the pipe either side?
Thanks for the simple explanation between water pressure and flow
I appreciate you uploading this
Dude. You da man. Here I thought I was having a water pressure problem where it's a flow problem. Thanks!
Great explanation and demonstration. doing a good job, liked all the videos of yours I have seen...
thanks for the kind words, glad you get use out of them
Excellent video -simple explanation
thanks for the feedback and watching our videos
Hello very nice video! I would like to ask, I am finalising a design for my gravity fed drip irrigation and my source water is from 40m elevation away. Sould I put my pressure regulator still on the source or should I place it near my drippers?
Thank you for the demonstration you just helped me visualize something that I had no idea I needed to know. I did know about pipe size and it's relation to but I thought was water pressure but really water flow. But I had no idea that water pressure did not translate into water flow. Great demonstration thank you very much.
It does. Flow is proportional to pressure. But it's also proportional to pipe size, and inversely related to pipe length (due to friction etc) so there's more than one factor to consider.
Very good illustration sir
thanks for the feedback
Excellent lesson, well done. I very much enjoyed this presentation and it was very informative and on point correct.
Good info , thanks.
glad you enjoyed our videos
What if the valve comes before the gauge, would you expect the water pressure to increase as you open the valve more? Why is that?
ua-cam.com/video/ZQKpu-obzlU/v-deo.html If the above doesn’t make sense, this video (towards the middle) when he shows his set up depicts what im talking about. He opens the valve more and the gauge reading goes up. Doesn’t that go against bernoullis pressure velocity relation(
Very informative. Simple, easy to understand and makes perfect sense. Thank you
I'd like to thank you for your video's with your help I have rebuilt my whole well system great job
Glad to help!!
I have a question. I was rebuilding my pump house and noticed that the pressure gauge was sitting at 40 psi so ran down till it kicked on at 30 went up to 52 kicked off. But after about an hour it was back to 40 is that normal. Any advice would be great thanks again wolf.
Very informative video. Well done & thanks
thanks, glad you found it useful
Love it..."look one more time..'
you would be amazed how often we deal with this with the invention of water savers in every fixture and pex pipe
Perfect example! Thanks for sharing!
Thank you. We have good water flow to the garden and at the pump. We used to have good flow into the house but we replaced the kitchen and bathroom faucets and the flow is pathetic. I think I will start there.
Thank you clearing my confusion, I always thought I have low pressure. Now I know that I have low water flow.
glad you found it useful
Texan accent..... beautiful. Clear presentation
good video and what I was looking for. Chees
I knew nothing before this video and this makes a world of sense, now I know what to get
Really great video, thanks!
thanks for watching and tuning in
This is awesome thank you
Thanks buddy! I learned Alot!
Keeping it simple.
Thank you for explaining this in a way folks can understand. Every single forum, or nonsense life hack published out there lies to everyone. They all say that removing the flow restrictor will increase pressure. It'll in fact have the opposite effect. I've had to break it down to them various ways. One way is the nozzle, on a scram turbine, or rocket engine. Less flow means higher pressure, because the force behind it is a constant. I've had to explain it to folks regarding ventilation as well. They all think that what they want is giant hoola hoop sized supply duct. When all else fails I've had to show them the same way as you did. I take a garden hose and turn it on, and then without moving the spigot valve, I simply cover part of the hose with my thumb. A reduced surface area increases friction, which raises pressure, as it simultaneously reduces amount of material coming from the constant supply. This means that it saves you money, and hits harder. Go ahead, and search Google for "How to increase shower head pressure", and be amazed at every link detailing instructions that will deceive you into doing the complete opposite. Increasing your bill, and decreasing your pressure. Even the visual diagrams you'll see are completely false. Increased flow means decreased pressure. Decreased pressure does not however increase flow. Increased pressure does increase flow as well. This is not an oxy moron either, because the placement of hardware in the equation determine the outcome. I think I over complicated it.
Well said, you didn't over complicate it. That was the whole point of this video because we deal with this all the time. It would save them some time and money if they just understood and thought about what you just said. You are exactly right, it isn't an oxymoron either as placement and location of hardware determine what you get coming out.
Your example of thumb over the end of a house is not analogous to the restrictor since the restrictor is inside the back of the head and your thumb is on the end. The water in the shower head fills completely before exiting, negating whatever increased pressure exists, leaving only the reduced flow.
I've removed restrictors from dozens of shower heads over the years and have ALWAYS been repaid with better flow with the same pressure. Anyone who disagrees either has not tried or works for the water company.
We have terrible flow it seems. Wondering if the UV lamp system is to small. And can't give the flow we need. There is a restrictor installed before this lamp as well
Please let me know what device can we use to detect sound waves in utility pipeline 8 feet underground connected with an empty pipe at ground level 50 feet away?
thank you. can you help me troubleshoot what I believe is a air lock in my hott water system
good little video
Great video. Thank you. This got me a little closer to reaching a conclusion on my sprinkler system setup. Hoping you can help me make the final decision. My incoming line from the city is 3/4". I wanted them to convert it to 1", but that was going to cost me $2600. I have a fairly large yard that will have sprinkler heads anywhere from 10 feet from the city box to about 200 feet from the box. From what I've researched, the farther the pipe goes the more drag you'll get. But the drag in a 3/4" line vs. a 1" line is vastly different. So my question is this: would it make sense to run my entire sprinkler system with 1" PVC even though I only have 3/4" pipe coming in from the city? Or should I do it all in 3/4"? This is with 55-60 psi.
same question i have
Same question I have too.
OK I have a question my well got hit by lightning and busted the casein have had the well replaced now we have sand in our well tank how can I remove the sand from the tank
Interesting. Our farm has 1.25" distribution piping everywhere except at the top of the well and at the house there are check valves that are not full bore (i.e. they reduce to 1"). How much will that little section effect overall flow?
Same question I have.
Thanks for the explanation
sure thing, glad it made sense to you
Great information thanks!
thanks
Thank be cause hubby he doesn't get this I've been trying to explain to him the same thing with the sprinkler system that's when he adds or subtracts sprinkler heads up change the volume of pressure I change the volume that comes out but I'm going to have watch this video maybe it'll sink in thanks
Excellent lesson
Nice job brother
Thank you for the clear information given here. It is very helpful to many of us. Kind regards and blessings.
great vid mate. all the way from Australia
Thanks for the information. I am trying to run a lawn sprinkler system off my home well. The pump flow is around 8 gallons per minute. 38 gallon Pressure tank, 40/60 switch. I have a freeze less hydrant between the well and the pressure tank, closer to the well. Is it best to connect in area of the hydrant or near the pressure tank. Can I put a booster pump (if needed) for the lawn sprinklers or will that mess with the homes system? I will reduce sprinkler heads to create more zones if needed. I currently have about 12 heads but may split that if needed. Thanks for any assistance.
i tried hooking up 3 or 4 sprinklers together in series with 3/4 hoses.. but they were hardly throwing any water.. My well is a 40/60 pressure set up.. On 40, off 60psi..
could I use one of those booster pumps at my hose spigot? then attach the main hose from there? would my well pump keep it supplied enough to send more water to the sprinklers?
Great, better than my instructor
thanks for watching!
Thanks for the great video and easy to follow explanation.
Gratitude, your explanation was very helpful I really appreciate this, I was also thinking while the water flow is running we should have some amount of pressure at the gauge instead of zero .
Thank you for your useful video .... can you give me some Equation
A^2 + B^2 = C^2
if i have a pump of 10 bars and 10 nozzles closed circle pipe of one inch diameter then how the pressure can be distributed on 10 nozzles
Excellent vid
Great presentation
Good video 10000% correct only issue is most of these new construction "plumbers" have NO clue what they are doing either MUCH less the avg handyman or DIYer. 3/4" pex feeding a 4 bath home is absolute trash but inspectors keep on giving green tickets everyday!
3/4 pexA trunk with 1/2 branches is more than enough! had to redo the whole house after the water meter this way.
Super helpful, thanks for the info :)
I have a 3/4” supply going to a 1" irrigation pipe. Looking at 100-200 feet of run. 60 psi. & roughly 9gpm at the 3/4”. Will I have enough flow (with 1" line) to overcome friction loss?
I really enjoyed the guy with southern accent imitating uneducated person with southern accent.... thanks for the video you answered my question somewhat... hey i gave u a like...
Great video! Thanks!!
hey man just got my journeyman's...whats better for water flow in a 1 bath, 1 kitchen house: a home run system or trunk and branch? How big should the well holding tank be? I'm about to troubleshoot my system, it has nice pressure and flow but only if a single faucet is open. sometimes the shower will completely stop running when the washing machine is running...
thanks from Canada!
Great explanation.
GREAT DEMO!
Seems to me that the reason why the flow rate was so close in the bucket was that they were both being feed through the same 1/2 black laundry hose off the water faucet. Flow rate increases with pipe size but not if they both came through the same 1/2" line.
you are right, it doesn't increase, but it can decrease if you have too small of a line installed. That is the point of the bucket test....not to show a increase, but decrease in flow
@@WendellLeeWellServices so to make sure I understand this, ¾ hose/pipes/fittings would allow the highest flow for a given pressure, and will maintain that flow/pressure over longer distances than ⅝ or ½.
So if I assume my house uses ⅝ pipes (no clue yet, it's a rental), will running a ¾ hose from the spigot make a difference? I understand it will not magically increase GPM or PSI since the pump is already restricted by the plumbing, but will it help maintain the GPM and PSI from the spigot for a longer distance than if I used a ⅝ hose? (This is all assuming I use fittings that do not restrict the flow)
Also if a pump pushes 100 GPM, and we'll say the ⅝ pipes flow 60 GPM, and I'm using a ¾ hose that *could* flow 75 GPM to a sprinkler flowing 20 GPM...... Does this mean the extra flow from the pump will still fill them ¾ hose and maintain better pressure since water is being pumped faster than the sprinkler outputs it? (All numbers hypothetical to help my simple mind)
Great stuff man!
thanks glad you found it helpful
Can someone explain this:
How can there be a difference since the flow rate increase when the pressure is higher in a smaller hose? If i take my thumb and block half the garden hose, the flow rate will increase and the preassure will increase. If i let go of my thumb the water pressure decrease and the flow rate decrease?
i work at a big hotel and our pressure reducing valve was going bad so we were having all kinds of problems...my boss could not understand why we were having all these complaints in the mornings when we were at 120 psi of pressure and people had weak showers...tried to explain the difference to him but he didnt get it....he was annoyed that it cost almost 1,500$ because it was 3 inch valve we had to replace.....
Thanks for the video. I’m plumbing in a new spigot in my shop. Right now there is a (1) reducer fitting about 12 inches from the spigot. 3/4 “ line upstream of reducer which is 1/2”. The line then goes back to 3/4 “ diameter. Since I’m redoing this section, I’m wondering if I should copy what’s there now or have the line be 3/4” all the way. To decide, I’d like to know how the flow and pressure changes with and without the reducer. I believe I have a water pressure gauge which would give me the pressure with the reducer but I would like to know what will happen to the flow and pressure if I remove the reducer. Hope youre ok with questions here. Thanks. Lab a little scary but made it through.
lol our lab is a little scary but informative. I would probably go 3/4" all the way. Not sure what you will be doing with your spigot but that should suffice. Glad you found our videos useful.
so if I run 3/4inch contractor hoses instead of 5/8 garden hoses for my sprinklers. I will get more water and spread coming out of my sprinklers? Water pressure is fine, just flow at the end sprinkler is a little thin
Thank you!! Now I understand there is a difference between water pressure and water flow coming from the faucet! 🙌 Now, I did the 30 second test and I'm getting 29 ounces from my bathroom faucet... I feel like this SUCKS!! Is this normal?? I don't own a gauge to provide any additional info except it's an apt.
Thank you God
Thank you for the experiment!
Thanks for the pressure/flow info.
Can you do a video explaining why we typically run a 3/4 inch pipe to our outside hose bibs but when you look inside the hose bib the hole is really small. That and all garden hose accessories are really small inside restricting flow. Why aren't these full flow? I don't get it?
4 bar of pressure is really good, in the UK we'd be lucky to get half that... Takes ages to run a bath
need 2-4 Bars pressure can it be achieved through selecting pipe size or it requires booster pump
Excellent. Thanks for sharing 👍👍👍👍👍
question .. smaller diameter pipe should have more psi right ???? so it should fill up the bucket fast
smaller diameter pipe means more friction loss, which means more psi to push the same amount of flow with a larger pipe
I've been scouring UA-cam for helpful videos on how to assess a private well accurately / properly to determine how to design your irrigation system. Does anyone have suggestions or videos that explain the 101 of designing a system off a private well??
Any tips on reducing water pressure on waterpick flosser machine? Would changing thickness of the hose will do it? Can I change thickness only on the tip?
Why is my bathroom sink and kitchen faucet, etc... water pressure come out so strong in the first 5 seconds, and then becomes constant flow?
So the diameter of the piping dictates water flow, and restricted water flow dictates pressure in the piping?
a pump can only pump a certain amount of pressure. so the amount of pressure in your piping system is ultimately dictated by your pump and what it can deliver. But, it won't be able to deliver as much pressure and flow if your piping isn't sized right. A larger diameter pipe is less friction loss, or less work your pump has to do to push the flow through.
Thank you a million. I work in water source Heat pump in Fl and I have good water but not enough Water Flow I Thing Building top floor is 24,,,,,,wondering if a booster will help....around 600 doll here Install price. Tnks. U know ur stuff.....blessings
What happens to the readings of pressure and current indicators and the amount of water pumped when a break occurs on the main water line of the city network?
Muy bien explicado! gracias
Miss your videos.
Your 2 feet of 3/4" pipe is restricted by the 1/2" water line behind the service sink with in the wall. 😊
Great explanation. Thanks. Why do you recommend removing water savers?
Pressure is the resistance of flow.
Close the valve, you create resistance and hence pressure.
Open the valve, you remove resistance to the flow and there for no pressure(that is not measurable with your pressure gauge).
Question: My back yard is about 200 square feet and I have 4 sprinkler head installed. I have 60+ lbs of pressure and 10gpm flow. Yet, all of the sprinklers do not move or get stuck instead of returning to start. Any ideas on why this is happening?
Soooo, with 50lbs of water pressure to my house, (sprinklers aren't shooting as far as I want), do I increase the size of irrigation pipe?