Upstream – part of a steam system located before a specified location.
Steam and condensate glossary
Wet steam, wet saturated steam – saturated steam, but still in the presence of water’s liquid phase. When the boiler sends through the piping saturated steam containing droplets of water, we speak of entrainment. It should be noted that the expression “wet saturated steam” doesn’t describe a physical state of steam, but rather a special case of saturated steam.