I have had encountered several instances of confusion regarding the proper determination of cloud point in crude oil. I have always adhered to ASTM 2500, placing a specimen in a cooling bath until wax crystals began to form and the crude becomes hazy, from experience the cloud point is about 20 degrees F above the pour point. Working in the Texas Panhandle, I have encountreed production people who have a very different definition of cloud point, suggesting that the specimen must be heated and cooled to room temperature until a haze forms, calling it cloud point and that most crudes have cloud points greater than room temperature? Could someone please provide some insight into this confusion, differences in terminology result in some labs reporting 10F for the cloud point and other labs reporting 83F.
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