Talk:Hydraulic accumulator

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At the end of the article is this sentence: "The gas precharge in an accumulator is set so that the separating bladder, diaphragm or piston does not reach or strike either end of the operating cylinder. The design precharge normally ensures that the moving parts do not foul the ends or block fluid passages." For a bladder style accumulator this is misleading. While it may be true for desired operational longevity, the bladder can and will contact the fluid port assembly if the fluid pressure is low enough. Check the various manufacturer's websites. When rebuilding the accumulator a small amount of pressure is put into the bladder to insure that the anti-extrusion ring and fluid port are seated correctly. It does this by expanding to fill the entire bladder and pushing down on the fluid port assembly. MMdelaIntec 20:08, 11 September 2007 (UTC)

correction: hooke's law is linear. the restorative force is directly proportional to excursion.

Pumped Reservoir Storage?

Doesn't pumped reservoir storage count as a hydraulic accumulator? (It would be basically a dead weight/raised weight accumulator, except that all of the dead weight is that of the fluid itself.) Lchiarav 05:25, 3 April 2006 (UTC)

No that is not. An accumulator should be able to store a considerable amount of energy. An oil tank does hardly store energy. Jeff 11:46, 25 March 2007 (UTC)

I think he is talking about Pumped-storage hydroelectricity. It stores energy, but in this article it is twice excluded by the definition: "a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source", and again by one of the purposes (presenting a more even load to the hydraulic pumps). Pumped storage uses a vast open mostly-natural reservoir, with no artifice pushing down on it. The pressures could be quite high (200ft drop), but the water is never used for a hydraulic power system, only to continuously run turbines for electrical generators.

Note, the "hydraulic engine house" example in the article also violates one part of the definition by not using any pressure on top of the water, but: the tank is man-made, and the hydraulic pressure is used for intermittent direct work, not a generating plant. Whiner01 04:37, 23 October 2007 (UTC)

bladder-type hydraulic accumulator

See also Jean Mercier. Scottcmu 16:21, 31 October 2006

spring type???

I see that a spring type hydraulic accumulator is mentioned. I wonder whether this type of accumulator was ever used. Anyway, I do not know one application. Reason is that the amount of energy that can be stored in a spring driven hydraulic accumulator is negligible. So it is better to delete this item. Jeff 11:46, 25 March 2007 (UTC)

Removed section

I removed the following section as it does not really belong in an encyclopedia. It looks to have come from a user manual or product blurb. It obviously does not apply to all types of accumulator, yet it doen't readily fit with any that are described.

I've left it here for someone more knowledgeable to process appropriately.

EdJogg (talk) 11:58, 2 April 2008 (UTC)

<<<START>>>

Guide to Accumulator bladder storage and shelf life

• Bladders are guaranteed for 24 months from date of despatch.
• Stored under ideal conditions they have an expected shelf life of 8 to 10 years.

Ideal Conditions:-

1. Stored in a stress free condition either due to natural shape or by partially inflating to natural size with nitrogen gas.
2. At temperatures 0 degrees C plus or minus 5 degrees C
3. In a dark sealed box and away from direct sunlight, heat or rotational electrical equipment.

For other conditions see A and B.

A.

Where ideal conditions of storage cannot be met, they have an expected shelf life of 5 to 6 years if they are stored under the following conditions:-

1. Stored in a stress free condition either due to natural shape or by partially inflating to natural size with compressed air or nitrogen gas.
2. At temperatures up to 25 degrees C
3. stored in darkness either in a dark room or covered with clean opaque or black polythene away from direct sunlight, heat or rotational electrical equipment.

B.

Where ideal conditions of storage cannot be met they have an expected shelf life of 2 to 3 years if they are stored under ideal conditions.

1. Stored in stress free condition by inflating with compressed air or nitrogen gas, so that they lay flat with flat without bending or folding which would promote sharp breaks or cracks in the rubber surface.

   Note- Do not stack the bladders

2. At temperatures up to 25 degrees C.
3. stored in dark room on a shelf covered with clean opaque or black polythene away from direct sunlight, heat or rotational electrical equipment.

Inspection before use

1. Inflate to not more than 1.5 times natural diameter.
2. Visual examination of seams.
3. Visual examination of surface for crazing.
4. Immersion test in water.

Note 1.

Rubber products, not stored properly, will be subjected to attack from ozone, heat and UV light. Cracking will develop within one year.

<<<END>>>

Removed a comment inserted into the article text which may or may not have merit.

On 05:25, April 22, 2012‎ 213.132.61.74 made this edit:

INCORECT STATEMENT An accumulator is placed close to the pump with a non-return valve preventing flow back to it. If a non-return valve were to be placed in the line, how would the accumulator re-charge with fluid?

I reverted the edit, but the comment may have merit. If someone understands the nature of the objection, feel free to comment on whether any correction of the article if necessary or not, or make the update. Thanks. J JMesserly (talk) 18:28, 5 May 2012 (UTC)

No, it's a misunderstanding. The system downstream also has a low pressure "exhaust" and that will feed back to the reservoir, from which the pump takes its pickup. Andy Dingley (talk) 18:52, 5 May 2012 (UTC)

Thanks Andy. By the way, the open accumulator text is totally plagiarized from the linked site for that section. I don't have the heart to cut it, because it is important info. What they are doing with that one is getting rid of the bladder and expelling stored compressed air through an air compressor/motor to recover the energy. That way they can more fully utilize the volume of the cylinder. I don't buy the order of magnitude claim, especially when you consider the fact that air motors are hardly isothermal. It might be useful for some applications like a kind of mini CAES thing attached to an air turbine to provide more constant power even when the wind dies a bit. J JMesserly (talk) 01:42, 6 May 2012 (UTC)

Edit war, August 2013

I think this is due to a misunderstanding. The working fluid is a liquid and is incompressible. The gas, which is compressible, is merely a means of exerting force, like a spring or a weight. Biscuittin (talk) 11:54, 29 August 2013 (UTC)

I was blocked for restoring the fact that liquids are incompressible, by an admin (Jayron32) who seems to think that they aren't and wanted the article left that way. Andy Dingley (talk) 12:07, 29 August 2013 (UTC)

Nope, you were blocked for edit warring. The actual information you were trying to include in the article is inconsequential. You may have actually been correct (or maybe not, it wasn't a factor in the block). You were blocked solely for the behavior you were doing, without regard for whether or not any piece of information was correct or not. --Jayron32 18:05, 29 August 2013 (UTC)

Not even a breach of 3RR, despite expanding the article to try and explain the issue, and despite already raising at AN3 to try and get some other editors involved in the issue. Your response was an immediate block, without even discussion. So I was blocked as a "preventative" measure (that being the basis for blocking). Incidentally leaving the article in the state that "liquids are compressible". Andy Dingley (talk) 20:09, 29 August 2013 (UTC)

I never claimed you breached 3RR. --Jayron32 21:30, 29 August 2013 (UTC)

Did I say that you did? You just blocked me anyway, though it wasn't even a 3RR. Andy Dingley (talk) 23:52, 29 August 2013 (UTC)

There's a thousand things you didn't do, for which I didn't block you. You were blocked for Edit warring. If I were you, I wouldn't do that again. --Jayron32 14:00, 30 August 2013 (UTC)

You expect me to grovel and be grateful because you didn't block me for a thousand things I didn't do? The sheer arrogance of admins remains as staggering as ever. Andy Dingley (talk) 14:26, 30 August 2013 (UTC)

I've never asked you to grovel. I've asked you to not edit war. I have no other expectations. You're the one who brought up unrelated violations you've never committed, as though it were relevent. --Jayron32 16:22, 30 August 2013 (UTC)

Compressed gas open accumulator

This entire section is part of an advertisement campaign for an intellectual property product that is for sale on the citation web page. It exists to lead people back to the web page where it is being sold. There are no citations, besides the one from the seller; and that page is for selling the technology while keeping any educational description hidden as intellectual property. 98.209.228.228 (talk) 20:15, 18 May 2014 (UTC)

I just read the article and had a quite similar impression. This entire section seems to have virtually nothing to do with *HYDRAULIC* accumulators so is irrelevant and, in my opinion, should be stricken. Atlant (talk) 11:43, 26 August 2016 (UTC)

Indeed, it is definitely promotional and moreover is copy-pasted directly from the UMN licensing page. The user who created that section, Jon.sry, seems to be a dedicated spam account based on his or her contributions. 73.170.41.47 (talk) 07:49, 9 September 2016 (UTC)

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A type of energy storage device

A person knowing few bits of physics can realize that pressurization of an incompressible liquid can’t store mechanical energy. The pressure volume work is determined with $\delta W=PdV\,$ so what can we see where $V=\mathrm {const}$? Incnis Mrsi (talk) 12:42, 5 September 2018 (UTC)

Fortunately that's not how they work. Andy Dingley (talk) 12:44, 5 September 2018 (UTC)

A horse doesn’t make the cart a motorized vehicle. Does a spring, a weight, or a gas cylinder make the reservoir with liquid an energy storage device? Incnis Mrsi (talk) 12:57, 5 September 2018 (UTC)

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