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bimr, is this a significant expansion? The specific volume (m3/kg) of liquid water at 60C (140F) versus 147C (297F) is 0.0010172 and 0.0010850, respectively. To me this is not a significant expansion. Composite, I found the boiling point relevant because this is the temperature I'm assuming...

Compositepro, wish it was a HW problem then I might just skip it and move on with my life :) The safety concern is not a pipe burst but rather the expansion of the pressurized gas if the downstream valve of the pipe were suddenly opened. I'm not concerned with the max the steam can heat to, but...

The water inside the pipe is stagnant, the steam in the jacket would be flowing. I was planning on simplify my calculations by saying that the heat given to the water in the pipe is just the heat of vaporization lost from the condensing steam.

LittleInch, this neglects the enthalpy of the remaining liquid. I don't imagine all, or even most of the liquid will vaporize -- only enough to reach the point at which the vapor pressure reaches 50 psig. According to my calculations using just PV = nRT, if P = 50 psig (4.4 atm), T = 297F...

Yes, this is a safety concern, racookepe1978 -- Let me clarify, this scenario is certainly not something I'm trying to do, rather something I want to make sure is avoided :) It is a hypothetical "if this happened" exercise that is meant to avoid safety issues.

Well an air/water vapor mixture. The vapor content would be low before heating with the water content increasing as more water evaporates.

I am wondering how much steam would have to be provided to a pipe (3 ft long, 2 in diameter, 316 SS) containing water to produce a vapor pressure of 50 psig. I'm assuming the pipe is half full of water (or 0.0325 cu. ft.) at 140F -- and that the water is stagnant and isolated (i.e. no flow and...