The Phenomenon Called Water Hammer

www.blacoh.com/blacohu
An in depth discussion by one of the industry's foremost experts, Gary Cornell, on the phenomenon of hydraulic shock, commonly referred to as water hammer. Learn what it is, what causes it, and how to control it. Hydraulic vibration and acoustics. Magnitude of pressure waves. Causes and effects. Controlling water hammer.

[@chrislow1173]

This has been a nice video to watch, it prity much says it all about the problem I've just stopped today, thru a failed diaphragm washer on my toilet system making the water pipe vibrate all the bording round my sink in my walls to point you could just touch the wall and feel the vibration it was loud, sound like a train horn, a flush of the toilet followed by loads of vibration and horn all fixed by £3 diaphragm washer

[@LaArtsGuy]

Thank you this was a great explanation.

[@reflecttcelfer]

Thanks for sharing, very informative!

[@faisalalenzi3722]

the session interesting and very helpful for me . sine we are working to build piping for RO water in length of 22 km from DMC to the University and we are using 4 pumps each ( 756 M^3 / hr ) we using the Surge tank to prevent the pumps and the piping from the water hummer . but it's good to know that I have to add the check valve between the surge and the pumps . since that was my suggestion to the contractor and I was insisting to add it but he wasn't interest to add it because the project lump sum

[@buzzydeft]

Awesome presentation, thank you. I have been researching the TVA Apalachia (yes, it is spelled with one p) dam and it`s powerhouse 8.3 miles downstream with a 280' drop in elevation through a 20' diameter conduit...serious head indeed. It has a 240' high surge tank with a huge diameter. Wish I could learn even more about the engineering behind this 1943 project. Any suggestions?

[@magicforest7958]

thank you very much for this video, very well made, i am a cadet over at crude oil tankers, i dont have much knowledge about hydraulics but i was wondering what is the reason there are no surge suppressors at an oil tanker ? the pipes and the pressures are extreme , and most people open and close valves without ever having read about water hammer (or hydraulic shock), why dont shipbuilders include them in the piping ?Sorry for the bad english .... thanks

[@lazerlazerz6925]

did you ever find out?0

[@97marqedman]

The manhole blowing off at 19:00 or so is a stormwater drain on an interstate in Minneapolis/St. Paul during a big storm. The manhole cover was blown off and a truck ran into it.

[@omerjhoseph8885]

bilim insanları.yangın pompalarında şok ları nasıl önleriz.bilgisi olan varsa açıklama yazarsa menun olurum

[@lazerlazerz6925]

When that guys mentions microseconds I got curious and used 1 microsecond in the equation. it went from 432PSI @ 1second to 43,000,000 PSI in 0.000001 second. That is an insane amount of pressure or I did the math wrong.

[@solobassoon]

At 6:20 a calculation is performed where '60' is used as a factor. What is the unit of that factor? With all due respect, that is why metric system is so much easier to do calculation with. We do not have to remember all these conversion factors.

[@drunkdonutboy]

I went to school for engineering and the class I took before my senior design course was all non metric units. Before that it was all metric. I work at a water treatment facility and I'm not dealing in metric.

[@heliocrono]

Feet per second? What kind of scientific units are?

[@davidroullier8002]

Amazing video, however that rule of thumb calculus is wrong. There is a maximum theoretical dP with instantaneous valve closure. At 6 ft/s, and 1.2 SG, it is roughly 312 psi, no 432. I guess it is explained later on the course or video.

[@davidroullier8002]

Depends on bulk modulus, I used 300 kpsi

[@faisalsheikh8148]

In my industry we have been facing an unique water hammer problem which has been developed to deliver max 6bar pressure via pump automation.
The logic was to turn off the pump by pressure switch when the pipe pressure reaches 6+ bar. And when the pipe end valve will open and pipe pressure drops below 3bar then the pump will start. Logically its working but we are facing water hammer problem when the pipe end valve shuts. During that phase the pressure wave oscillates violently 0 to 10 bar. It causes to turn on and off the pump via pressure switch.
Point to be noted, there is a non-return valve after pump delivery point and before pressure switches. It happens for few minutes.
I am thinking to place a non-return valve at pressure switch outlet point to control the reverse pressure wave, will it work?