|MadSci Network: Engineering|
Your question does not quite make sense as worded. So I'm going to try and answer what I think you might have meant. If this does not answer your question, then you can resubmit with more explanation of what you are talking about. A pound of steam is a certain mass; if you condense the steam you would get a certain number of gallons of water (still the same number of pounds, of course). The relationship between the two would be given by the number of pounds in a gallon of water. This varies with temperature, it is about 8.3 pounds per gallon at room temperature. But often the term "pounds of steam" has a different meaning, referring to the pressure (not really in "pounds"; this is short for "pounds per square inch") at which the steam was generated. As you probably know, water boils at a higher temperature at higher pressure (about 100 degrees C at one atmosphere pressure, a pressure cooker gets hotter, water boils at a lower temperature at high altitude). So if somebody says "200 pound steam" (or "200 psi steam") they mean steam generated by boiling water at that pressure (from the Steam Tables, I find that such steam would be at about 382 or 387 degrees Fahrenheit, depending on whether the "200 psi" was absolute pressure or gauge (amount above 1 atm) pressure). The higher the pressure of generation, the higher the temperature and the more can be done with the steam industrially. So a chemical plant might have steam lines running around at different pressures (perhaps labeled 500 psi steam, 200 psi steam, 100 psi steam, etc.) with the higher pressures being used when they need something hotter. I can't think of any connection between this concept of "pounds of steam" and "gallons of water per minute". Finally, I will mention that you can find some general information on properties of water and steam under the "FAQs about Water and Steam" section of: http://www.iapws.org Allan Harvey "Don't blame the government for what I say, or vice-versa."
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