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Topic Title: Ram pump for the 21st century
Topic Summary: An analogy with the electronic Boost Converter
Created On: 20 December 2013 01:43 PM
Status: Post and Reply
Related E&T article: Ram pump for the 21st century
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 20 December 2013 01:43 PM
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ANFierman

Posts: 138
Joined: 25 July 2008

Somewhere a year or two ago I read an article that described an electronic switched mode boost - or step up - power supply converter as analogous to the hydraulic ram pump in this article.

Of course, now that it would be handy to be able to post a link to it, I can't find it anywhere, however, the links I have found do describe the analogy in much more detail but somewhat less clarity.

http://www.me.utexas.edu/~long...purosLongoria2003.pdf

http://www.fluidas.ro/hidraulica/2013/nr_1/7_18.pdf

This page has a very clear description of how the hydraulic ram pump works

http://www.clemson.edu/irrig/equip/ram4.htm

and this sort of discusses the electronic circuit in terms of the hydraulic pump

http://antonalyptic.blogspot.c...-pumps-revisited.html

If anyone finds a much simpler and clearer article then it would be great if you could post it here.



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Andy Fierman

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http://signality.co.uk
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 25 December 2013 03:31 AM
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kengreen

Posts: 400
Joined: 15 April 2013

hello Andy,

From 1971 until about 1980 we drew our water by means of a hydraulic ram but it was a much more simple device than is shown in your links; the diagram in your third link has much the same thinking behind it but I can't work out how it functions if it ever did?

There are two types of RAM: one draws on a single source of water to both drive the RAM and provide the "potable" water; the second type avoids wasting an inadequate supply by using a second "non-potable" flow to do the work.

In our RAM, which succumbed to a serious flash Frost, the drive pipe ended in a small chamber with a large rubber-type disc which was slammed up against an a exit (very large holes). The pressure wave that was generated certainly travelled back up the drive pipe but it also opened a similar flap valve which bled water into the very-large pressure chamber from which water was extracted via a half-inch pipe and delivered to the house with a lift of approximately 45-feet.

The pressure wave as it travelled up the drive pipe trailed behind it a reduced pressure wave which opened the main disc valve and also closed the bleed valve; the length of the drive pipe coupled with the mass of the main disk and it's flexibility (and doubtless a few few other imponderables) formed an oscillatory system which was tuned by a pressure screw which held the disc by its centre.

In use it gave remarkably little trouble; it required attention about every 2 - 3 weeks just to bleed the air from the top of the main pressure chamber with an automatic audible alarm as the air (water-hammer) bubble cushioned the thump which, on a silent period, could be heard up to about 40-yards away and was also clearly heard in the house where the plastic delivery pipe leaned against the wall; the reduced efficiency also caused the beat-frequency to rise.

Up until the thing froze and knocked out a large hole in the main drive pressure chamber the only trouble arose from bits of detritus that was sucked into the drive pipe which included an unfortunate frog.

As installed the machine was intended to supply the house built on a flat 32-feet above it with a further lift of about 15 feet into the header tank in the loft. Later a 1500-gallon reservoir was constructed as at a height some 75 feet greater and the RAM happily kept that topped up although, not surprisingly, it took its time! also to regard against a reduced flow in summer we had an electrically-driven pump in the garage.

Ken Green
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