I was assisting in the startup of two absorbtion chillers, 100 tons each. Same steam supply at 200 psig, each with there own step down regulator. One has 2.5" supply and 2.5" regulator, low press. side 14 psig and about 235 deg. F. The other one has a 2.5" supply with a 1" regulator stepping back up to 2.5" pipe, at 10 psig and (280 deg. F)! How is this possible, steam temp. for 10 psig is around 220 deg. or so right? Keep in mind steam source is the same from a plant a couple of miles away, and no superheaters. Why is steam superheated so much more on this one? Is it the smaller regulator?