> In 1698 Thomas Savery obtained a patent for "Raising Water by the > Impellent Force of Fire" > I found it in a booklet from the Science Museum of London > "The Steam Engine" > It is by no doubt a pistonless pump.
It certainly is. I'd never heard of this pump. I set out to say that it was similar but not identical to "my" PPP. On reflection it is essentially identical (and to Lockheed's and Flometric's as well). He builds a "half pump" as pulsating flow is no problem. Using multiple chambers is just an engineering refinement and can be thought of as just using several single cylinder pumps in parallel and out of phase. The Lockheed pump uses typically 3 pump chambers, my version and Flometrics use two. This makes no difference to the basic principal. His suction side is the means of filling the pump chamber. He uses steam condensation but that is simply an implementation detail. He uses steam pressure to drive the water head above the pump chamber - directly comparable to using a gas pressure source in the "modern" versions. He was limited to a pressure head of about 40 feet / 18psi, but that limitation is caused solely by the technology available to him (which included soldered joints!). > Savary`s pump was build 300 years ago. It's nice to know that I have re-re-re-re-invented something some 300 years old :-) He does a good job of establishing prior art for the general pistonless concept :-) And it's also nice to know that one day the basis for the first ever patent for a steam driven pump will be employed to bring down the cost and complexity of rockets :-) The last of your 3 links gives an excellent description of all aspects of Savery's system. > http://www.spl.ch/temp/PPP/ppp.pdf > http://www.geocities.com/Athens/Acropolis/6914/Saverye.htm > http://www.history.rochester.edu/steam/savery/ Russell McMahon _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
