One of the best video demonstrations out there on RUclips regarding this subject. Provide easy-to-understand demonstrations without getting WAY too technical/complicated about the intricacies involved....Then provides demonstrations to illustrate and provide evidence for the lessons being taught and points being made. This helps people like me thoroughly understand and solidfy the concepts -so I won't forget and retain the knowledge during the course of this lifetime
Totally True. Actually, physics approves what you've demonstrated: When we restrict the water flow, water pressure(static pressure)drops in restricted area and increases in not restricted area ;it's the bernoulli equation. Thanks, man, now I'm even less confused about pressure.
EXCELLENT EXPLAINED. Your demonstration about how by having the same pressure from a source gives different amount of water flow, due to having more or less resistance in the line, is correct. What most people seem to be confused about is Bernoulli's equation. Let me explain about it. Many considerations are needed in order to apply Bernoulli's equation. But two are essential, one is applying it in a single streamline, and the other one is to a steady system. The last condition refers to that there can't be a change of properties in time, so the system needs to be constant. This last assumption doesn't apply here, where someone compare the before and after the thumb was placed. When it wasn't placed your thumb, the section of the hose is larger than the nozzle, so as people say, velocity is increased at the expense of pressure at the exit, but this also happens when you put the thumb, so why does someone see that the pressure increase in the pressure gauge in the last scenario?! That's because of the system curve!! Roughly explained, when you have water flowing it needs to go against obstacles, that would include, pressure diferences, new heights, bendings, rugosity, etc. All these things considered tell how much pressure you need to apply to generate a flow rate, so with more obstacles, we need to apply more pressure in order to keep moving a flow! That's why when you put your thumb, the pressure increased. You created and obstacle, so that translates to needing more presssure in order for the flow to circulate! This is the same as thinking that you need more pressure to reach the top of a 20 floor building than a 6 floor one. There is also the pump curve to go in depth!! It relates the amount of flow given by a pump at a certain pressure. When you have 0 flow (because it is totally restricted, as with a close valved), you have max pressure provided by your pump, but this is the opposite when there is no restriction! Max Flow with 0 pressure! There topics are confusing at first sight, so i encourage you to look for pump and systems curves! Hope i clarify you a bit.
Great video! Very well explained. I am researching to figure out the minimum height and distance of a water reservoir that will supply my house with water on the farm. Your video helped a lot. Thanks. Keep up the good work.
Thanks for that on point demo and explanation Sir. I read some negative comments here but I think they just misunderstood how venturi effect works and in this case as you demonstrated, that smaller pipe actualy did drop the initial pressure but not sufficient enough to achieve the velocity required to drop it even further. It did showed venturi effect but there is not enough velocity to drop the pressure to zero. If we met that velocity requirement, it can even drop to negative pressure. Im glad Ive seen your demo a I also been researching about fluid mechanics for my hydrokinetic water pumping system, and this scenario is a great case to consider.
Actually (min. 2:15), in theory restricting the flow doesn't increase the pressure, it increases the flow velocity, to get the same volume of water through the smaller opening (Venturi effect). At a higher initial velocity, the water leaving the hose then travels farther, which is what you see when you "thumb" your garden hose.
From a smarter source than myself: Is the flow rate in a pipe proportional to the pressure? Is flow rate related to pressure, flow rate, and pipe diameter? From the point of view of qualitative analysis, the relationship between pressure and flow rate in a pipe is proportional.
Yes but in this case the pipe cross section is fix so there is no drop in pressure as it restricts the flow even more. It can only happen when you change the pipe diameter small enough to achieve the reqired velocity to drop the pressure to zero to negstove and then suddenly increase the diameter to as big as possible to accomodate the volume it diacharges without compressing it. Thats venturi eff3ct.
Thank you, i’m trying to make myself some water spray guns for industrial purposes and couldn’t figure out how to get it to clean faster thinking higher pressure would do it. It was all in the gallon per minute and now I will be able to test if there is any pressure left. Thank you for the demonstration
1 inch diameter water line at 40 to 60psi gives you many times more flow than just 8 GPM. 1/2 inch line usually gives you 8GPM if you have a large ball valve instead of the gate valve which restricts the area of flow. The flow charts show that 1 inch line at average pressure of 50 60psi will give 37 gallons per minute if you have a 1 inch openining. He demonstrated a small gate valve which has probably opening of only 3/8 inch diameter. If that 3/4 inch line had a large ball valve it would give about 23 GPM. Most small homes in Vancouver BC Canada only have 3/4 inch main line and it is enough flow to even hook up 2 induatrial pressure washers which need 4 GPM flow rate sustained. So 1 inch line would give you even more 37 GPM. What people should do in their homes is to have the main line with large dianeter run all the way around the house to the last water fixture. Do not reatrict the pipe size to the last water fixture. You want the big pipe to provide unreatricted watee flow around the whole house and then to the individual bathrooms you can restrict it down to 1/2 inch or 3/4 inch. But 1 inch line gives you ton of flow.
Great video and demonstration, loved the experiment you did. This is a very counterintuitive concept that is hard to understand at the beginning. I'm sorry but a couple points that I need to do here to clarify: 1) at 2:07 you said that when you restrict the flow pressure goes up and that is NOT the case. When you restrict flow pressure actually goes down, is conservation of energy and Bernoulli explains this clearly. When you put a nozzle pressure goes down but VELOCITY goes up, this is called continuity equation. If wanted I can go into the details. 2) On the second scenario that the gage goes to 0 is because the gage is so far off from the stream with those unions that the vacuum effect of the high flow of water prevents water to go up to the gage. I bet if you close the valve halfway you will see some pressure because now the vacuum effect is much less. Ideally to measure water pressure like that you will need you gage touching the stream of water or at least a Y and not a T. 3) Pressure is a given but Q=VA, where Q is flow, V is velocity of the fluid and A is cross sectional area so obviously a bigger pipe will increase flow. 4) On the main concept that Flow is more important than Pressure to fulfill a home demand you are correct
Something was destroying my water heater every 5-6 years. City was giving my house water measures at 90-105 psi. I installed a pressure reducing valve to bring the pressure down to 55 psi and that allows a proper calibration of my expansion tank. My home insurance kept installing the wrong water heater for years. RUclips showed me and its time to do all of this myself.
Not sure about your jurisdiction, but in most places (NYC included) plumbing is designed to function properly for up to 80 pounds of pressure. If water pressure ever exceeds that PSI (like if you're being supplied from a very high elevation), a typical pressure reducing valve reduces the pressure to 80 pounds of less. Hoping that information is of some help to you, and thanks for your response!
Might be the water quality or something. 90-105 should be fine. I have 120PSI (way too much because of hills) without the reduction and the only issue I have is I can't fill up a cup of water at the sink at full flow because the water jumps off the cup and onto the ceilling. Water heater is fine..
@@zane003 If folks choose to be directed by individual opinions and personal experiences instead of nationally recognized plumbing standards, that is of coiurse a personal choice.
I’m not an expert on this. Just thought this demonstration would be fun and enlightening. As far as psi or flow, you need both. Plumbing has minimum requirements for both. Thanks for your endorsement of this video. Appreciated.
Good demo! However, the *static* pressure in the big hose one is greater than in smaller one. I see in the video that in first case you have 40-41 pounds of pressure , but in second time you have almost 60 ! So it's less pressure in small tubes than in larger ones. 1. 01:44. 2. 02:52
That question may just be above my level of knowledge! My point was that when there is a restrictor near the outlet the pressure increases. The volume inside different sized pipes remain the same.
@@snrnsjd Bernulii equation applies in one system when the flow rate is constant. But when there are two system, in this case, 2 water hose, it doesnt apply
Flow rate, volume/time, is the problem. That is mostly influenced by pipe Diameter, but you must also have enough pressure to get that flow through the pipe. You can only get more pressure at the same flow rate through the same pipe diameter only by adding a pump. Any attempt to get more flow without adding a pump may be successful, but the pressure will drop. If the pressure drops too much, you must add the pump. If you increase pipe diameter at the same pressure, the flow will increase while the pressure remains about the same, up to a point. When the pressure starts dropping too much, then you will need to add a pump to get more flow, of course that also increases the pressure.
I think technically and counter intuitively, the speed of the water increases when leaving the pipe through a restriction (like a nozzle) but the pressure technically decreases. But, I’m not a scientist or an engineer!
For a consistent pressure of 40psi like that its easy to fix it, just put a pressure tank with significant volume it can accomodate and you get the prssure you want. Watch videos about diy softdrink bottle and mineral water container pressure tank for instructions.
1" min for a home service in New York??? Thats massive in my experience here in Toronto for most older homes (im sure mcmansions in the burbs with 5 hardly used bathrooms need more). My house has a 70 year old 1/2" lead service (unfortunately)and while the pressure and volume do kind of suck its still enough after all these years to do what we have to do including filling up the hot tub reasonably quickly every few weeks. I service mid rise buildings with 8 floors that only have 2" service and they have tons of pressure and volume. Maybe our municipal pressure is higher here? 1" Seems quite large for a min size. Good video.
@balkanplumbing No water tanks here that I am aware of and certainly none required by the code. I can see the utility during a power outage though as any unit above the height if the nearest water tower will have no water untill the power is restored. If I understand Manhattan is pretty flat and dense so it likely makes sense to have water stored on top of buildings rather than relying on pumps/water towers to get water to people in mid/highrises below a certain height where they would automatically be needed otherwise. I was working in a 19 story building the other day that had an 8" watermain burst....flooded underground parking and water in the elevator meant no water to the building and no elevators (sump pums couldnt keep up, elevator shaft flooded) for around 50 hours while they dug it up to fix it. A water storage in the roof would have made the situation at least 50% less brutal for the residents at least untill that ran dry...
Very interesting, thanks for the demo. What I’m wondering is, if I have a 1” pipe and add an additional pipe 1.5” to it via a Tee junction 20’ long with a garden tap at the end, what will be the outcome. Will volume or pressure change much. I haven’t given it any thought yet . 🤔 Maybe you or another RUclips viewer knows.
Do not take off a larger branch line than the line its connecting to. It will create a pressure reduction. Especially not good if being used as a garden hose connection.
Great demonstration but it would have been great if water wastage was reduced or maybe collected properly. Still very clear and understandable demonstration.
what an egotistical way of thinking. In some places there is so much fresh water available that they dump it into the ocean if it doesn't get used to avoid flooding.
Thumb on the hose does not increase pressure, it increases velocity. What if the service line from the city (the main source) is 3/4? Will increasing the size of the pipe have an effect on the flow?
I dont know if u will see this. My problem: when i use a hand held water sprayer, flow, pressure and volume are fine. When i install a sprinkler to the same hose and water faucet, everything reduces to a trickle. Ive used different kinds of sprinkler with the same results. Please explain why when u have some time. Thanks!
It sounds like there is not enough volume of water to serve the sprinkler. Try connecting it to a larger line. Or choose a sprinkler that requires less water. Hope that helps.
Great video! So if my house is fed by, say, a 1" pipe, does that mean that adding a larger pipe downstream is useless because it can never exceed the flow restriction caused by the 1" pipe?
.A new faucet (a dual spray switch tap that allows to switch between a strong shower setting, and normal stream setting) is installed downstairs. Whenever the downstair neighbor switches to strong flow setting I hear a high pitched water stream noise in my kitchen. The below neighbor uses the high flow setting quite often in the day, and it affects my ears as I have an ear condition called tinnitus. But it's loud enough that even someone without tinnitus would find it annoying (the nails against chalkboard type of sound)..why the noise is coming, Really appreciate any help, thank you!
Water flow, water pressure, water opening. Same water pressure, less water opening, faster flow, less water. Same water pressure, more water opening, slower flow, more water. ... On mine ventilation. Same air pressure, wider opening, slower flow, more air quantity. Same air pressure, narrow opening, faster flow, less air quantity
Interesting. So at our farm, we have 1-1/4" line but there are 1" check valves. One at the top of the well and one at the house. How much will those check valves effect overall flow?
That’s a bit over my knowledge set. Wells like that involve a pump or pumps, and are engineered. I am surprised there are 1” check valves on 1 1/4” lines. But again, beyond my skill set.
The check valve has a pressure drop associated with it, so that drop in pressure or resistance is reducing your static pressure from the source. So for instance you have 40 psi of static pressure at the main valve where you connect, but after passing through the check valve you lose 5 psi. That loss needs to be accounted for in your overall system design, as you will now only have 30 psi available after the check valve. The way you find out how much actual pressure drop you will see from a device like a check valve is to go to manufacturer and ask for a pressure drop chart for their device. Typically you can see what the pressure drop would be based on the flow and known velocity entering the device. The velocity can be found by knowing the flow and pipe size/pipe material.
This is a old video, but the fist place you reduce a pipe, in this case at the top of the well, that is the effective size of the pipe all the rest of the way. You could have 2" pipe the rest of the way, and you will not get more flow than the 1" pipe flow. You would need to change both check valves to 11/4" to get the full flow. This is a poor plumbing job.
One of the best video demonstrations out there on RUclips regarding this subject. Provide easy-to-understand demonstrations without getting WAY too technical/complicated about the intricacies involved....Then provides demonstrations to illustrate and provide evidence for the lessons being taught and points being made. This helps people like me thoroughly understand and solidfy the concepts -so I won't forget and retain the knowledge during the course of this lifetime
What can I say? WOW
What a wonderful and kind review. I can’t thank you enough. All the best to you in the new year.
Totally True. Actually, physics approves what you've demonstrated:
When we restrict the water flow, water pressure(static pressure)drops in restricted area and increases in not restricted area ;it's the bernoulli equation. Thanks, man, now I'm even less confused about pressure.
Ha! Thank you. Good vibes appreciated.
EXCELLENT EXPLAINED. Your demonstration about how by having the same pressure from a source gives different amount of water flow, due to having more or less resistance in the line, is correct. What most people seem to be confused about is Bernoulli's equation. Let me explain about it.
Many considerations are needed in order to apply Bernoulli's equation. But two are essential, one is applying it in a single streamline, and the other one is to a steady system. The last condition refers to that there can't be a change of properties in time, so the system needs to be constant.
This last assumption doesn't apply here, where someone compare the before and after the thumb was placed. When it wasn't placed your thumb, the section of the hose is larger than the nozzle, so as people say, velocity is increased at the expense of pressure at the exit, but this also happens when you put the thumb, so why does someone see that the pressure increase in the pressure gauge in the last scenario?!
That's because of the system curve!! Roughly explained, when you have water flowing it needs to go against obstacles, that would include, pressure diferences, new heights, bendings, rugosity, etc. All these things considered tell how much pressure you need to apply to generate a flow rate, so with more obstacles, we need to apply more pressure in order to keep moving a flow! That's why when you put your thumb, the pressure increased. You created and obstacle, so that translates to needing more presssure in order for the flow to circulate! This is the same as thinking that you need more pressure to reach the top of a 20 floor building than a 6 floor one.
There is also the pump curve to go in depth!! It relates the amount of flow given by a pump at a certain pressure. When you have 0 flow (because it is totally restricted, as with a close valved), you have max pressure provided by your pump, but this is the opposite when there is no restriction! Max Flow with 0 pressure!
There topics are confusing at first sight, so i encourage you to look for pump and systems curves!
Hope i clarify you a bit.
I think I understand better from your response. I was leaving out velocity. I was confusing pressure for velocity. Thank you!
Absolutely shattered my years of understanding. Thanks man
Thank you… I think!
Joking, thanks.
Great video! Very well explained. I am researching to figure out the minimum height and distance of a water reservoir that will supply my house with water on the farm. Your video helped a lot. Thanks. Keep up the good work.
Thank you so much for your kind. I’m glad I helped in some way. Good luck with your project.
Above all negative comments, the topic is on point.
Thanks for that on point demo and explanation Sir. I read some negative comments here but I think they just misunderstood how venturi effect works and in this case as you demonstrated, that smaller pipe actualy did drop the initial pressure but not sufficient enough to achieve the velocity required to drop it even further. It did showed venturi effect but there is not enough velocity to drop the pressure to zero. If we met that velocity requirement, it can even drop to negative pressure. Im glad Ive seen your demo a I also been researching about fluid mechanics for my hydrokinetic water pumping system, and this scenario is a great case to consider.
And why it cannot drop pressure to zero?
If the pressure dropped to zero the volume is the same as the other hose right?
I tihnk this will be really helpful to get some of my staff to understand this since my explinations seem to fall on deaf ear. Great visualization.
I’m flattered! No joke. Thank you so much. Made my day.
Thank you very much sir, you are a wise man. Greetings from Quito!
Hello to Ecuador and thanks.
Pressure is experienced when the flow is restricted.
Diameter of pipe determines flow which is imp for increase in volume.
Exactly, yes! Both are true statements.
Excellent demonstration sir!
Thank you. Positivity always appreciated!
Great video information ❤ VERY MUCH clear to me ❤😊 thank you for sharing your knowledge ♥️🇵🇭
Kind words are always appreciated. Big thumbs up to you.
Actually (min. 2:15), in theory restricting the flow doesn't increase the pressure, it increases the flow velocity, to get the same volume of water through the smaller opening (Venturi effect). At a higher initial velocity, the water leaving the hose then travels farther, which is what you see when you "thumb" your garden hose.
From a smarter source than myself: Is the flow rate in a pipe proportional to the pressure? Is flow rate related to pressure, flow rate, and pipe diameter? From the point of view of qualitative analysis, the relationship between pressure and flow rate in a pipe is proportional.
Yes but in this case the pipe cross section is fix so there is no drop in pressure as it restricts the flow even more. It can only happen when you change the pipe diameter small enough to achieve the reqired velocity to drop the pressure to zero to negstove and then suddenly increase the diameter to as big as possible to accomodate the volume it diacharges without compressing it. Thats venturi eff3ct.
Very well explained thanks sir love from india ❤️
From India! That is so cool. Thanks for your kind words. All the best.
Thank you, i’m trying to make myself some water spray guns for industrial purposes and couldn’t figure out how to get it to clean faster thinking higher pressure would do it. It was all in the gallon per minute and now I will be able to test if there is any pressure left. Thank you for the demonstration
You are welcome. Thanks!
So beautifully explained.
Wow! Thank you so very much for your kind words. Very much appreciated.
The best explanation on youtube Thanks
How very nice of you to say that. Thank you.
great video thank you very much
Cool! That’s appreciated.
1 inch diameter water line at 40 to 60psi gives you many times more flow than just 8 GPM. 1/2 inch line usually gives you 8GPM if you have a large ball valve instead of the gate valve which restricts the area of flow. The flow charts show that 1 inch line at average pressure of 50 60psi will give 37 gallons per minute if you have a 1 inch openining. He demonstrated a small gate valve which has probably opening of only 3/8 inch diameter. If that 3/4 inch line had a large ball valve it would give about 23 GPM. Most small homes in Vancouver BC Canada only have 3/4 inch main line and it is enough flow to even hook up 2 induatrial pressure washers which need 4 GPM flow rate sustained. So 1 inch line would give you even more 37 GPM. What people should do in their homes is to have the main line with large dianeter run all the way around the house to the last water fixture. Do not reatrict the pipe size to the last water fixture. You want the big pipe to provide unreatricted watee flow around the whole house and then to the individual bathrooms you can restrict it down to 1/2 inch or 3/4 inch. But 1 inch line gives you ton of flow.
Look up the nyc dep sizing chart. Probably maybe could be, then there is what it is.
Why there is a different flow rate? The flow rate have to be the same in the different hose.
What should differ is the velocity.that is venturi effect
Thanks alot man.. I wanted to do the same experiment to understand it. But now you did it for me and the result is surprising.
Cool. So much negativity out there. Nice to hear some kind words. All the best.
A pretty Amazing demonstration. Thanks A lot and stay blessed. love from Pakistan.
Thank you so much for your kind words. Love back at you from NYC!
Great video and demonstration, loved the experiment you did. This is a very counterintuitive concept that is hard to understand at the beginning. I'm sorry but a couple points that I need to do here to clarify:
1) at 2:07 you said that when you restrict the flow pressure goes up and that is NOT the case. When you restrict flow pressure actually goes down, is conservation of energy and Bernoulli explains this clearly. When you put a nozzle pressure goes down but VELOCITY goes up, this is called continuity equation. If wanted I can go into the details.
2) On the second scenario that the gage goes to 0 is because the gage is so far off from the stream with those unions that the vacuum effect of the high flow of water prevents water to go up to the gage. I bet if you close the valve halfway you will see some pressure because now the vacuum effect is much less. Ideally to measure water pressure like that you will need you gage touching the stream of water or at least a Y and not a T.
3) Pressure is a given but Q=VA, where Q is flow, V is velocity of the fluid and A is cross sectional area so obviously a bigger pipe will increase flow.
4) On the main concept that Flow is more important than Pressure to fulfill a home demand you are correct
Honestly, you’re much better informed on this subject than I am. I just like to share and learn as I do so. Glad you enjoyed it!
A bigger pipe do not increase flow, flow remain the same the velocity is augmented in the small pipe
A bigger pipe leads to less decreases of energy caused by friction
@@martino515 yes I said that
@@martino515 you are actually correct, thank you.
Something was destroying my water heater every 5-6 years. City was giving my house water measures at 90-105 psi. I installed a pressure reducing valve to bring the pressure down to 55 psi and that allows a proper calibration of my expansion tank. My home insurance kept installing the wrong water heater for years. RUclips showed me and its time to do all of this myself.
Not sure about your jurisdiction, but in most places (NYC included) plumbing is designed to function properly for up to 80 pounds of pressure. If water pressure ever exceeds that PSI (like if you're being supplied from a very high elevation), a typical pressure reducing valve reduces the pressure to 80 pounds of less. Hoping that information is of some help to you, and thanks for your response!
Might be the water quality or something. 90-105 should be fine. I have 120PSI (way too much because of hills) without the reduction and the only issue I have is I can't fill up a cup of water at the sink at full flow because the water jumps off the cup and onto the ceilling.
Water heater is fine..
@@zane003 If folks choose to be directed by individual opinions and personal experiences instead of nationally recognized plumbing standards, that is of coiurse a personal choice.
WELL DONE, demonstration I have asked well pump suppliers what is better to have psi or flow, they dont have a real good answers.
I’m not an expert on this. Just thought this demonstration would be fun and enlightening.
As far as psi or flow, you need both. Plumbing has minimum requirements for both.
Thanks for your endorsement of this video. Appreciated.
well done and super interesting video, Thanks!
Thank you for your kind words. Glad you found this video of interest.
Good demo!
However, the *static* pressure in the big hose one is greater than in smaller one. I see in the video that in first case you have 40-41 pounds of pressure , but in second time you have almost 60 ! So it's less pressure in small tubes than in larger ones.
1. 01:44.
2. 02:52
Not sure I caught that in the video. Pressure is actually a constant regardless of size of pipe. Volume of water provided is the difference.
@@balkanplumbing
So the Bernoulli smaller diameter= increase velocity= decrease pressure applies only to moving fluid?
That question may just be above my level of knowledge! My point was that when there is a restrictor near the outlet the pressure increases. The volume inside different sized pipes remain the same.
@@balkanplumbing ok! I got IT! Thank You very much!
@@snrnsjd Bernulii equation applies in one system when the flow rate is constant. But when there are two system, in this case, 2 water hose, it doesnt apply
Flow rate, volume/time, is the problem. That is mostly influenced by pipe Diameter, but you must also have enough pressure to get that flow through the pipe. You can only get more pressure at the same flow rate through the same pipe diameter only by adding a pump. Any attempt to get more flow without adding a pump may be successful, but the pressure will drop. If the pressure drops too much, you must add the pump.
If you increase pipe diameter at the same pressure, the flow will increase while the pressure remains about the same, up to a point. When the pressure starts dropping too much, then you will need to add a pump to get more flow, of course that also increases the pressure.
thank you for your effort sir
Glad you liked our video. Thanks!
The pressure isn't changing, it's the velocity which is not pressure.
Is the pressure increased or decreased? According to bernoullis equation there should be a decrease?
I think technically and counter intuitively, the speed of the water increases when leaving the pipe through a restriction (like a nozzle) but the pressure technically decreases. But, I’m not a scientist or an engineer!
For a consistent pressure of 40psi like that its easy to fix it, just put a pressure tank with significant volume it can accomodate and you get the prssure you want. Watch videos about diy softdrink bottle and mineral water container pressure tank for instructions.
Good JOB! Ping Pong Champion!
Thanks - a lot of hostility on RUclips!
Amazing
Thanks
Yes, good demonstration and it must be good when you have Balkan in your chanel name :) .. anywhere best regards from Balkan
Nice! From Balkan to Balkan. Love it.
3/4” line should get ~15 gpm.
40 psig is low for residential use
1" min for a home service in New York??? Thats massive in my experience here in Toronto for most older homes (im sure mcmansions in the burbs with 5 hardly used bathrooms need more). My house has a 70 year old 1/2" lead service (unfortunately)and while the pressure and volume do kind of suck its still enough after all these years to do what we have to do including filling up the hot tub reasonably quickly every few weeks. I service mid rise buildings with 8 floors that only have 2" service and they have tons of pressure and volume. Maybe our municipal pressure is higher here? 1" Seems quite large for a min size. Good video.
Quick question, on the 8 story building is there a water tank? Any building over 6 stories in NYC requires a water tank on the roof.
@balkanplumbing No water tanks here that I am aware of and certainly none required by the code. I can see the utility during a power outage though as any unit above the height if the nearest water tower will have no water untill the power is restored. If I understand Manhattan is pretty flat and dense so it likely makes sense to have water stored on top of buildings rather than relying on pumps/water towers to get water to people in mid/highrises below a certain height where they would automatically be needed otherwise. I was working in a 19 story building the other day that had an 8" watermain burst....flooded underground parking and water in the elevator meant no water to the building and no elevators (sump pums couldnt keep up, elevator shaft flooded) for around 50 hours while they dug it up to fix it. A water storage in the roof would have made the situation at least 50% less brutal for the residents at least untill that ran dry...
Very interesting, thanks for the demo. What I’m wondering is, if I have a 1” pipe and add an additional pipe 1.5” to it via a Tee junction 20’ long with a garden tap at the end, what will be the outcome. Will volume or pressure change much. I haven’t given it any thought yet . 🤔 Maybe you or another RUclips viewer knows.
Do not take off a larger branch line than the line its connecting to. It will create a pressure reduction. Especially not good if being used as a garden hose connection.
That makes sense. Thanks
Great demonstration but it would have been great if water wastage was reduced or maybe collected properly. Still very clear and understandable demonstration.
Thanks!
The water was not lost, it evaporated back into air and will return to earth in the future.
what an egotistical way of thinking. In some places there is so much fresh water available that they dump it into the ocean if it doesn't get used to avoid flooding.
Thumb on the hose does not increase pressure, it increases velocity. What if the service line from the city (the main source) is 3/4? Will increasing the size of the pipe have an effect on the flow?
What do you suppose makes the velocity increase?
Perhaps the pressure?
Oh boy…
I dont know if u will see this. My problem: when i use a hand held water sprayer, flow, pressure and volume are fine. When i install a sprinkler to the same hose and water faucet, everything reduces to a trickle. Ive used different kinds of sprinkler with the same results. Please explain why when u have some time. Thanks!
It sounds like there is not enough volume of water to serve the sprinkler. Try connecting it to a larger line. Or choose a sprinkler that requires less water. Hope that helps.
When u say pressure, please specify which pressure. There are many types of pressure. I am always confused with the term pressure.
PSI pounds per square inch.
@@balkanplumbing i mean static or dynamic
Great video! So if my house is fed by, say, a 1" pipe, does that mean that adding a larger pipe downstream is useless because it can never exceed the flow restriction caused by the 1" pipe?
If you mean larger than 1”, yes absolutely correct. It would serve no purpose.
To get vertical height we need thinner pipe
What happens if you have a 3/4th inch line coming street then inceease to 1 inch?
Very good explanations and demonstrations, but why are you wasting so much water??
A water test without wasting water. Hmmm
The NYC water supply leaks between 15 million to 35 gallons every single day. How about that?
Bobnewman, is this supposed to be a joke?
You're a 🤡
.A new faucet (a dual spray switch tap that allows to switch between a strong shower setting, and normal stream setting) is installed downstairs. Whenever the downstair neighbor switches to strong flow setting I hear a high pitched water stream noise in my kitchen. The below neighbor uses the high flow setting quite often in the day, and it affects my ears as I have an ear condition called tinnitus. But it's loud enough that even someone without tinnitus would find it annoying (the nails against chalkboard type of sound)..why the noise is coming,
Really appreciate any help, thank you!
You really need to call a local and licensed plumber. Might have to use a pressure gauge. You need an on site analysis.
thanks sir @@balkanplumbing
Good
Thanks.
So basically the larger line provides more available pressure
Exactly not. Same pressure, more volume. Two different things.
Water flow, water pressure, water opening.
Same water pressure, less water opening, faster flow, less water.
Same water pressure, more water opening, slower flow, more water.
...
On mine ventilation.
Same air pressure, wider opening, slower flow, more air quantity.
Same air pressure, narrow opening, faster flow, less air quantity
Hydro water turbine require water flow or water pressure sir can you tell me please
That question is beyond my knowledge base. Sorry about that!
Interesting. So at our farm, we have 1-1/4" line but there are 1" check valves. One at the top of the well and one at the house. How much will those check valves effect overall flow?
That’s a bit over my knowledge set. Wells like that involve a pump or pumps, and are engineered. I am surprised there are 1” check valves on 1 1/4” lines. But again, beyond my skill set.
The check valve has a pressure drop associated with it, so that drop in pressure or resistance is reducing your static pressure from the source. So for instance you have 40 psi of static pressure at the main valve where you connect, but after passing through the check valve you lose 5 psi. That loss needs to be accounted for in your overall system design, as you will now only have 30 psi available after the check valve. The way you find out how much actual pressure drop you will see from a device like a check valve is to go to manufacturer and ask for a pressure drop chart for their device. Typically you can see what the pressure drop would be based on the flow and known velocity entering the device. The velocity can be found by knowing the flow and pipe size/pipe material.
This is a old video, but the fist place you reduce a pipe, in this case at the top of the well, that is the effective size of the pipe all the rest of the way. You could have 2" pipe the rest of the way, and you will not get more flow than the 1" pipe flow. You would need to change both check valves to 11/4" to get the full flow. This is a poor plumbing job.
Gracias. Thank you 👏👏👏
Thanks for your kind words.