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Dec11-11, 03:06 PM
Sci Advisor
P: 916
I'll provide you one more explanation. The pressure in this system is initially based on the elevation of the level in your condensation tank and the temperature density of the water in the two tanks. As you heat the water there is some level swell due to heating and expansion of steam (decrease in density), but basically the pressure at the bottom of the tank will still be determined by the height of the water in the condensation tank until either the boiling rate exceeds the relief flow rate capacity of the tubes or the water in the condensing tank reaches boiling off.

There is no physical way to cause a sudden pressure drop in the lower tank because your one way valves ensure that you can't "burp" the system and quench the steam/water mixture in the boiling tank.