Recently a customer asked, "How much water is contained in a pound of saturated steam?" That question as asked can't be answered, we would need more information.
Saturated steam (steam at saturated temperature/pressure) can be described using the metric “quality" or “dryness”. At one end of the range is 100% [which is all dry steam (gas) with no wetness (liquid) at all]. At the other end is 0%, all saturated water and no steam at all.
The answer to the question, if it has 100% dryness, is that it has no water (moisture) at all. In practice, normal ranges are around 80-95%. A sample of steam with 80% dryness (or quality) would mean that for every pound of what is in the pipe, 80% of that is steam, and 20% is entrained water.
Does you have questions about steam, air or water you'd like answered? Send them to us and we'll do our best to answer them for you.
Posted on Wed, April 13, 2016