A Description of the Differential Expansive Pumping Engine Giving Practical Exa

Cover A Description of the Differential Expansive Pumping Engine Giving Practical Exa
A Description of the Differential Expansive Pumping Engine Giving Practical Exa
Henry Davey
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It is a term which might be dispensed with, and the actual H. -P. Universally adopted as the standard, to advantage.
The Admiralty rule for N. H. -P. Is 7 A V D*V N ' H - P ' = gpob or "GOO- V = velocity of piston in feet per minute. A = area of cylinder. D = diameter of cylinder. S = stroke of engine in feet. Ordinary rules D 2 !/~$~ N. H. -P. = v for high-pressure engines. JLo * o D 2 N. H. -P. = - for condensing engines.
For ordinary horizontal high-pressure non- condensing engines D z D 2 o
...f commerce, an approximate rule is N. H. -P. = r^, and H. -P. =, which is approximately right for an initial pressure of 50 Ib. And cut off at half stroke, with 300 feet piston speed per minute.
PRACTICAL NOTES AND FORMULA FOR PUMPS AND PUMPING ENGINES.
To find the quantity of water delivered from a given pump or pipe- Let d the diameter in inches, then : = the quantity delivered per foot, stroke, or flow in 30 gallons, a little under the theoretical quantity.
22 A DESCRIPTION OF THE A good working velocity of flow for water in the pipes is 200 feet per minute, and the speed of pump piston or ram most suitable for the "Differential Expansive" Pumping Engine, is equal to J L x 60, where L = the length of the stroke in feet.


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