How to Charge HYDAC Hydro-pneumatic Bladder Accumulator

This video has been prepared in order to explain the process of charging the Nitrogen pre-charge pressure of a bladder type accumulator.
HYDAC Australia host regular training courses on many topics, including hydraulic accumulator technology in Melbourne, Australia. For more information, please visit our website, www.hydac.com.au.
What is an accumulator?
Hydraulic accumulators are specifically designed to store and then discharge pressurized fluid as needed. They are classified as pressure vessels. Hydropneumatic accumulators are charged with nitrogen, which is separated from the fluid by a piston, bladder or diaphragm. There are risks involved when working with high-pressure gasses and fluids. On no account must any welding, soldering or any mechanical work be carried out on the accumulator shell. Work on systems employing hydraulic accumulators must only be carried out once the pressure in the fluid and/or the gas have been released. This tutorial video has been prepared in order to explain the process of charging the nitrogen pre-charge pressure of a bladder type accumulator.
Charging:
Hydropneumatic accumulators need to be pre-charged with an inert gas in order to work at all. Selection of the correct gas pressure is vital, as it defines the stored hydraulic fluid volume and pressure, which are important for the safe and correct operation of any machine. It is important that the correct gas pressure is maintained, and periodic inspection is therefore necessary.
This gas used in hydro-pneumatic accumulators is almost always industrial grade nitrogen. The use of other gasses in these applications is dangerous, and should not be considered.
The nitrogen pre-charge pressure of an accumulator can only be assessed when it has been fully depressurised of hydraulic fluid. This means that the accumulator must be positively isolated from a live system and released of all hydraulic energy, or that the entire system has been completely shut-down and fully depressurised, or that the accumulator is not currently connected to a system, for example, it is on a work bench.
The HYDAC FPU-1 Universal charging and testing unit can be fitted directly to HYDAC diaphragm and piston accumulators, but it uses an adaptor to connect to a bladder type accumulator. This is known as the A3 adaptor. It is clearly stamped A3.
The accumulator gas valve will be opened and closed by pushing the valve plunger down. This will be operated by the centre screw of the A3 adaptor. Due to the high pressures involved, this should never be done by hand. Due to the high pressures involved, this valve should never be opened by hand. Use only the correct equipment, that is the universal charging and testing unit.
Important:
The purpose of this video is to give you some guidance of how to charge an hydro-pneumatic accumulator. Note that only people with special technical training should undertake this task.

[@1980edfr]

Muito bom. Eu sou projetista da Fero/PARKER. E no momento estou desenvolvendo uma bancada de enchimento de acumuladores Hydac. Esse video me ajudou demais. Obrigado

[@mechanicalchennai101]

Awesome Video, Thanks for Knowledge Sharing

[@ADITYASHARMAACADEMY]

www.adityasharmaacademy.com/2020/10/spring-loaded-accumulator-construction.html

[@jprasad5619]

A very informative video

[@sirassaf]

How can i buy the charging unit in video Thank you so much

[@dhruvmodi8702]

Sir it is compulsory to use pressure regulator which is on the nitrogen cylinder ??

[@gaddamsathish1204]

Good

[@agusrahmat414]

what is the standard for refilling nitrogen in a 6 liter 330 bar accumulator bladder

[@donnyidham2810]

Do you have local contact in Indonesia? I need to buy recharging equipment for my hudraulic accumolator

[@Srk7028]

Is 35 litter accumulator maximum pre charge pressure 35 bar ?

[@willycortez1680]

how much pressure in the actuator?

[@satishpandeyy7383]

Please explain us the working principle of a VACCUM DEGASSER

[@empirenaturals3857]

please do you offer training services for recharging diaphragm and Blader accumulators

[@HydacAu]

Hi Joyce, Yes, we do :) Our Accumulators course has a major “Hands-on” component, where bladder accumulators are disassembled, inspected, assembled and pre-charged. Diaphragm and piston accumulators are also demonstrated. You can find more information and enrol online here: www.hydac.com.au/hydac-training/accumulators/ Thank you !

[@ADITYASHARMAACADEMY]

www.adityasharmaacademy.com/2020/10/spring-loaded-accumulator-construction.html

[@naushadali4345]

Concrete boom pressur naitroja gais kitna hona chahiye

[@fahd7503]

Hello Mrs I have 4 kg accumulater for transfer lathe how many bar neutrogen should be in an accumulater The hydraulic pressure is 80 bar

[@Amarjitsingh-dm8ok]

70 bar

[@anilkumarkhati3195]

Ye device kaha se milega

[@amzbmxibipa]

Um gás inerte é aquele que não sofre alterações quando submetido a determinadas condições. ... Argônio e nitrogênio purificados são os gases mais comumente usados como gases inertes devido à sua grande abundância na natureza (78% N2, 1% Ar no ar) e seu custo relativamente baixo. Resumindo: Se juntarmos o oxigênio, fluido hidráulico faltara somente somente uma fonte de calor para uma possível explosão e com o nitrogênio não tem esse problema.

[@gilabejero3518]

You have branch here in the philippines?

[@amzbmxibipa]

@@gilabejero3518 eu trabalho em uma empresa aqui no Brasil chamada Tectrol. Preciso de alguma coisa pode entrar em contato via nossas redes sociais.

[@bouyahiaouifares9747]

why we use only nitrogen to charged the bladder and we dont use other air is it the weight of nitrogen or what ?

[@tonymurphy2372]

nitrogen is an inert gas and cannot combust unlike air (oxygen) . because an accumulator is a pressurised vessel using air you can risk an explosion

[@gouravbanik2972]

because nitrogen is incompressible fluid

[@paulhockey5]

@@gouravbanik2972 Literally the opposite of the purpose of the system, gas is used because it acts as a spring for hydraulic fluid on the other side of the bladder. It has to be compressible to work.

[@ADITYASHARMAACADEMY]

www.adityasharmaacademy.com/2020/10/spring-loaded-accumulator-construction.html

[@argonairgasesprivatelimite5138]

how can buy the charing unit

[@HydacAu]

Please contact your nearest HYDAC branch. See our worldwide locations on this link: www.hydac.com/de-en/nc/company/locations.html

[@maxmad525]

1. How about removal of residual air prior to Nitrogen filling? And also after replacing the bladder in other video ( "How to Assemble a Hydraulic Bladder Accumulator")? After all, as you know, Nitrogen must have at least cleanliness class 4.0 and 99.99 vol.% 2. First, "remove the charge head from the adaptor" and only then "close down the Nitrogen bottle" - are you serious? Why not the other way around?

[@HydacAu]

Thanks for your question! Point 1: We remove the air by rolling up the bladder, squeezing the air out before assembling it into the shell. Then the bladder is inflated with Nitrogen. A small amount of residual oxygen in an inert Nitrogen rich environment is not a problem. Point 2: The order of operation for this part of the task is not important once the system has been de-pressurised.

[@maxmad525]

@@HydacAu Thank you for your prompt response! Sorry for question 2, because I missed the phrase about closing the control valve, and this step was not shown in the video.