Accumulators (Full Lecture)

In this lesson we'll examine an extremely handy peripheral hydraulic component known as an accumulator. Accumulators perform numerous important functions in a hydraulic system including but not limited to: maintaining system pressure when several components activate at the same time, developing fluid flow, compensating for thermal expansion and contraction, controlling noise, absorbing shocks, maintaining pressure in the event of pump failure allowing the orderly shutdown of a system, smoothing pump pulsations, and compensating for fluid leakage.
Additionally, we'll examine several hydraulic circuits making use of accumulators, the means to bleed or discharge accumulators, the construction of weighted and spring loaded mechanical accumulators, the different types of hydro-pneumatic or gas charged accumulators (piston, diaphragm, and bladder), and briefly discuss precharge and its influence on the available quantity of pressurized fluid. Finally, we'll discuss sizing accumulators and failure modes common to hydro-pneumatic accumulators. (Full Lecture)
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Use it. Don't steal it. Be cool.
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For more FREE online technical training check out the following playlists available at the bigbadtech channel:
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[@infinitymfg5397]

This was an awesome explanation. I've been looking for someone discussing this all weekend.

[@txddyfarquh3916]

Now I see why these are seen as popular items in Cars with Hydraulic Suspension. In the 90s, i had never seen these Units in modified Cars until prob the mid 2K. Very thorough Video

[@Theo0733]

Thanks a lot!!! This is the best explanation about the accumulator.

[@KidNapPingNo1]

I’m 6min in the video and your already have my like. It wasn’t so easy to find a good video about this topic but yours really satisfied my need for more knowledge :) thanks for the effort

[@PistonShack]

Thanks for detailed explanation.

[@navjotsingh-ib1iu]

really very helpful thanks a lot

[@omkarshirodkar9829]

thanks, This video is very helpful......

[@uathavia1]

thank for the info

[@terrichan]

Hi Jim! Great lecture!! Can accumulators set the discharge pressure? I'm trying to have a constant set pressure in the circuit and wonder if accumulators will do the trick. How do I design a circuit that all fluid goes into an accumulator first before flowing into a motor? The fluid seems to just bypass the accumulator and straight to the motor.

[@bigbadtech]

+Terri Chan If I dig what you're saying check out the sequence valves lecture at: th-cam.com/video/0_bK_ngfVz0/w-d-xo.html

[@mithileshramteke3882]

Thank you

[@johnevan7737]

Thanks for the lecture,seen some of your videos and theyre very helpful. Just asking if whats the min and max press to charge a gas accumulator?Again thank you,these John Evan from Philippines.

[@bigbadtech]

Very nice. Glad you're making use of this content. Long story short ... it all depends on manufacturer specifications.

[@amitshakya5730]

Hi Please help me as I want to learn about the use of accumulators for Regenerative Braking System . ThankYou

[@bigbadtech]

Sounds like a great project but I'm going to have to decline the offer. Please check the FAQs at: th-cam.com/video/Do7VzDuB_Rc/w-d-xo.htmlm4s

[@krishnendu.ckichus6455]

Hi sir... Pls help me? Pls give me a good answer....
Our machinery connected one accumulator 32 ltr nitrogen.. 330bar pressure. Bt now the pressure not maintaining.. Then the accumulator refilling and fixed.. Bt no use.. Hydrolic motor off.. Same time the pressure going to zero pressure... Mechinery work pressure level fix it 120... But running time the pressure is going up and down... 120... 50.. 0..110...50... 0..10.. 30.. 120..... Eny help.. N comment sir???? 🤔

[@mumachikonde1141]

What an explanation, thans a lot mate.
So how do you count for the Tempreture Effect in adiabatic compression/de compression

[@bigbadtech]

To scientifically account for temperature you'd have to use the Combined Gas Law: th-cam.com/video/zCZFXj36b0s/w-d-xo.html
In practice, the accumulator charging procedure often specifies it must occur over a specific length of time to ensure any temperature change is absorbed by the environment.

[@epilifOD]

Great videos, I started seeing them for work but kept seeing them on the free time too xD , by the way, any one knows the name of the program that he is using?

[@bigbadtech]

Glad you're making use of the material. Here's the FAQs about production: th-cam.com/video/Do7VzDuB_Rc/w-d-xo.htmlm32s

[@mohamedayoub1449]

Hi Mr. Pytel , amazing lecture .
So , I have a question . Accumulators can be used If we have a cylinder that needs 20 lpm and 200 bar of pressure at one action that lasts for a minute , and needs 200 lpm and 20 bar at another action for 6 seconds
But it can't be used for an action with 200 lpm and 300 bar ..i mean the pressure can't be higher than the pressure of the dominant action , the action that lasts for longer time ,

[@bigbadtech]

You would need an intensifier to do that.

[@mohamedayoub1449]

@@bigbadtech i'm sorry but what is intensifier ?

[@bigbadtech]

en.m.wikipedia.org/wiki/Hydraulic_intensifier

[@mohamedayoub1449]

@@bigbadtech thank you Mr. Jim it was very helpful

[@satishpandeyy7383]

Please explain us the working principle of a VACCUM DEGASSER

[@phuccaoo]

So what are the differences between an accumulator and an expansion tank?

[@bigbadtech]

They're kind of the same thing, however, an expansion tank is ordinarily small and purpose built to give expanding fluid space to fit inside a closed system. Ordinarily and you wouldn't use an expansion tank as an auxiliary source of hydraulic power.

[@arslanahmad1195]

Sir, thank you for these free resources. Can I suggest an improvement though? The slides are visually OK except for the pictures attached. The pictures and diagrams are unreadable even at 720p. There is a room for improvement.

[@bigbadtech]

I see what you're saying! The accumulator performance charts are awful! Here's an example of an accumulator performance chart (from a different manufacturer):
www.ihservice.com/PDF%27s/Accumulator%20Selection%20Charts.pdf
Also here's a link to the Parker A Series Piston Accumulator I mention later in the lecture:
www.parker.com/Literature/Accumulator%20&%20Cooler%20Division%20-%20Europe/Accumulators_Hellaby/Parker%20A%20Series%20Piston%20Accumulators_HY10-4024.pdf

[@Srk7028]

@@bigbadtech if u can, plz give link for chart shown in this video.......

[@pnachtwey]

I have never seen a spring loaded accumulator in 40+ years. I have seen one weighed accumulator in an aluminum plant. It was big. I could see the wight move up and down during the machine cycles. A problem I have come across is a lack of N2 at 3000PSI to charge accumulators in remote saw mills. I have never seen any flow controls between the accumulator and system except for a "dump" valve to dump pressure for safety. Accumulators are good for supplying oil when a servo system is rapidly accelerating because it takes many milliseconds for pumps to respond to the demand. I was writing this during the video. He finally gets to the dump valve. I recommend one takes into account the temperature while charging because that is usually done at ambient temperature but run time could be 130 degrees. I have put my hand on the accumulator during operation. I have never felt the accumulator heat up and down during a rapid cycle. I use a simulator to find the ∆V during a cycle. I recommend a high pre-charge for servo applications where the goal is to keep the pressure drop to only 10% of P2. A common problem I have seen is the accumulator precharge is too low. This causes the supply pressure to drop and this causes the open loop gain of the hydraulic actuator to drop too much.

[@Theunislb]

Can this be downloaded in a textbook or notebook fashion to keep on hand to make studies easier?

[@bigbadtech]

Here are the study guides associated with each lecture: openoregon.pressbooks.pub/hydraulics/

[@Theunislb]

@@bigbadtech Thanks I appreciate it greatly kind sir.

[@Theunislb]

@@bigbadtech do the sums/ qeustion problems coincide with the lecture material given in your TH-cam videos. Mechanical engineering graduate here transferring in to heavy diesel and hydraulic technology . And your material is better than what most colleges offer.
You are a hero to the masses I dare say.

[@bigbadtech]

Yes, the study guides follow the lectures for the most part including example problems. Ideally you should be able to answer all the questions after watching the lecture. Funny, I keep telling my family that I'm a legend but they don't seem to agree.

[@Theunislb]

@@bigbadtech and your oddly specific but correct sense of humor just makes it all the better.

[@user-jm1db9dm4g]

see HYDAC ASP Software

[@ENGHHO]

Thank you