Water Flow and Water Pressure: A Live Demonstration

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Folks seem to routinely overemphasize the importance of water pressure as it relates to their home or property. Actually, water pressure is only one component that affects the flow of water into your home or property. This live video demonstration will attempt to illustrate the difference between the flow rate of water, and water pressure in clearly apparent terms. Water pressure can frequently be increased using water flow restrictors (a garden hose nozzle or a shower head comes to mind). While the flow rate of water typically depends on the actual size of your pipes, and a few other factors as well.

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Balkan Sewer And Water Main Service was founded in 1952. Since its inception the foundation of the company has been based upon integrity and honesty in all of our dealings. That solid foundation has enabled us to thrive in every economic climate. The year 2021 actually marks our 69th consecutive year in business. As we have grown, we have become increasingly dependent upon a "Team First" approach.

What helps ensure a continuation of our high standards, overall integrity, and high company morale, is that same "Team First" approach. Complete client satisfaction has always been the number one goal at Balkan Sewer And Water Main. That is why we are NYC's largest and most trusted sewer and water main service. Simply put, if it's plumbing, and it's underground, we do it. For almost 70 years, and for over 100,000 New Yorkers to date, Balkan is "The Team You Trust".

Balkan Sewer And Water Main
NYC's Largest And Most Trusted Service
718-849-0900
130-01 Jamaica Avenue
Richmond Hill, NY 11418
00:00 Introduction to water pressure and PSI
00:30 Introducing 2 water lines with pressure gauges attached
00:55 Water pressure and volume are different factors
01:40 Water pressure vs. resisitance of flow
02:35 Water flow test with no resistance
03:40 Live demonstration of capacity of different sized water lines

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One of the best video demonstrations out there on YouTube 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

guyappin

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.

atila

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.

FelipeSilva-synb

Absolutely shattered my years of understanding. Thanks man

digvijayjayakar

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.

re-começar

Above all negative comments, the topic is on point.

walkinfaith

Pressure is experienced when the flow is restricted.
Diameter of pipe determines flow which is imp for increase in volume.

rohintonmistry

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.

erwinconxepts

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.

HamzaHashem

Great video information ❤ VERY MUCH clear to me ❤😊 thank you for sharing your knowledge ♥️🇵🇭

JaykeSapalaran-iqqs

Thank you very much sir, you are a wise man. Greetings from Quito!

edwinrafael

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.

JJ-vlyy

The pressure isn't changing, it's the velocity which is not pressure.

bdaddylo

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

angelmiesestatis

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.

HealthSupercharger