In the catalytic diesel unit, the flash point of online samples does not match that of samples from the storage tanks
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At our facility, samples of catalyzed diesel were taken on the line leaving the processing unit; its flash point was 70. After it entered the storage tank, samples taken from within the tank showed a flash point of 55. After staying in the tank for one day, the flash point decreased by so much – and no reason could be identified. (The possibility of cable cross-talk has been ruled out.) I would like to ask my colleagues and experts: have you encountered similar problems? How can this phenomenon be explained?
This phenomenon may be caused by the following reasons: 1. Flash point testing method: If the testing methods for the two samples are different, it may lead to different results. It is recommended to ensure that the same testing method is used for both samples. 2. Sample collection and storage methods: If the methods for collecting and storing online samples and those from storage tanks differ, it may also affect the measurement of the flash point. For example, if the sample is exposed to air during collection or storage, volatile components may be lost, thereby reducing the flash point. 3. Equipment issues: Check your storage and measurement equipment to see if there are any faults or errors. 4. Temperature changes: The temperature inside the storage tank may be higher than that outside, leading to the vaporization of some components with low boiling points, and thus a decrease in the flash point. 5. Pollution issue: Ensure that the storage tank is not contaminated by other substances, as pollutants can change the flash point of diesel. It is recommended to conduct further experiments and equipment inspections to determine the specific cause. .