Water pressure versus water flow

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[jacobleedowney]

One of those principals that is so simple yet seems so complicated. Thanks for helping me make sure I'm thinking correct. XD

[jeffbowen]

Pressure v Flow, we just want the “Force” to be with us.
Strangely during the first weeks of lockdown, we notice the force of water from our taps drop. We live in a very old hose, built around 1920 and previously if we were to turn the cold tap in the kitchen on and off quickly we would hear a bang in the pipes, this bang had now stopped.

Good thing you would think, but this drop in “force” has had a secondary impact in that when we run the hot tap for the bath or shower, the combi boiler doesn’t fire up. If we turn the hot taps on in the bath, bathroom sink and kitchen at the same time, the boiler works fine.

We called the water company, who came out to test things. The engineer could not come into the house due to their Covid 19 precautions but was able to test things from our garden tap. He said the pressure was fine at 5 bar but the flow was very low at 0.4 litres per static head minutes.

He said it was most likely the main stop tap outside the house so would arrange for it to be replaced. This has now been done and there is a new black plastic one instead of the old brass one that was there. However, it has made no difference to the problems we have, any ideas on what we can do next?

[jackjill]

+Ultimate Handyman Hi,
I am looking to have a saniflo sanicmpact installed. Technical advice the following:
Sanicompact requires 1.7 bar *_dynamic incoming water pressure_* (i.e. measured whilst the water is flowing into the Sanicompact and not static pressure

I am told that *dynamic incoming water pressure* is not the same as static pressure

Can you advice how I can test for this *dynamic incoming water pressure*

Thanks in advance

[AlastairjCarruthers]

Pressure is how much force there is pushing the water along. Flow is the volume of water being moved.

If you blast someone with a Super Soaker water pistol, the water will hit them with quite a lot of force, but the volume of water being delivered is actually quite low. This system is high pressure, low flow.

If instead you tip a bucket of water over their head, they get lots of water on them in a short time, but with very little force behind it. This system is high flow, but low pressure.

[ChrisTheSparky]

I use this when explaining Voltage and Amps. Voltage is the pressure pushing the electricity along and Amps is the amount of electricity that's there.

[joannacolhoun]

I’m using a pressure reducer that came with my hose lock irrigation system but it makes a horrible loud noise through the house whilst the system is on so I was hoping I wouldn’t need the pressure reducer?

[SeanHayesParleys]

Great title, but I still don't know the difference between pressure and flow. All I know is that I might need to add a reducer. On to the next video to learn the answer to my question. 👍

[steves]

You have an omni-presence! Everything I search for, there you are. I’m sure if I was to search, for example, male impotency, you’d have a video on that as well! :-)

[curiosity]

100 PSI is pretty high, I think standard here in the U.S. is around 60. Costs around 50 dollars a month here in Illinois for 4000 gallons usage. How does it compare? Part of that bill is for sewage maintenance.

[cliffcarlo]

Electric cable so close to a water supply always makes me a touch nervous lol
Merry Christmas and all the best for 2016.

[chrismortimer]

Quality. Nice work mate -I found that really useful. Thanks for taking the time to film and post it.

[zedman]

Great explanation as always. Contrary to popular belief you can pump mains water, however only to the recommended 12l/min. Something like a salamander homeboost which will raise the flow rate of it dips below this. Useful for combi boilers where flow rate is important. You have plenty of fly by night plumbers that never check the flow rate before installing a combi!

[tommymartin]

you live up to your name man. I really like your videos

[BariumCobaltNitrogn]

I like your video a lot so I'll give you some numbers.
Here are some rates for a northern california city, Oakland November 2017 at a pressure of between 45 and 80psi, plus a service charge based on pipe size $30, $90, $290 for 1" (25cm) 2" (50cm) 4" (100cm) per month.
Rates for Single Family Residential Accounts (per 100 cubic feet)
First 172 gallons per day (gpd) $3.45
All water used in excess of 172 gpd up to 393 gpd 4.74
All water used in excess of 393 gpd 6.27

[crazylove]

Is the below statement true -

Every high flow may result in high pressure of water but every high pressure may not result in high flow of water.

[Sheenaization]

I have 7 bar pressure, there's lots of noise when taps run. Should I reduce the volume or pressure?

[benjames]

So pressure is the force pushing the water along and flow is the amount of water you have to push at any one time?

[BigEarlPearl]

If I increase my PRV to a higher pressure will it increase flow rate?

[flanderstf]

Thanks. SO will a pressure reducing valve lessen the water flow ?

[davidworsley]

Well, I suppose all the physics professors watching will not be surprised, but as a retired plumber, I certainly was.! It was however considered bad practice to reduce flow with a stoptap, I can't remember why-must have slept through that bit!