A given hydrocarbon gas-water-model oil system, used as a reference system for testing of new hydrate inhibitors, has been evaluated for experimental reproducibility of hydrate formation and behavior at flow conditions. The system was remixed five times in a 2 " ID high-pressure flow loop and tested for the reproducibility both within one mixture (closed system) and between the remixtures. The results indicated good reproducibility both within the closed system and between the remixtures.