Definition(s)
Wax appearance temperature
The wax appearance temperature (WAT, also commonly known as the cloud point) is the temperature at which the first wax crystals form as the crude is cooled, while the pour point is the temperature below which the crude will no longer flow.
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards