How is finished oil sampling carried out at various refineries?
Thread Content
In recent years, the quality of petroleum products has become extremely important. However, the control of the quality of finished products in refineries may vary; some refineries simply check the products in the storage tanks and consider them acceptable if they meet the standards once. But during this process, there are interruptions in loading and unloading from these tanks, and changes in temperature and volume surely occur. It’s impossible to know whether the quality remains unchanged under such conditions； Is there any sampling based on the condition at the time of manufacture? Is it more reliable to monitor the final quality stage in this way? Or both pick the jars and leave the factory? Detailed information on high-quality rice, along with standardized quality control criteria – an introduction for general awareness~~~
I don’t quite understand what that means. In our tank area, the finished products are blended in tanks, sealed, allowed to settle, and then sampled. If the sampling is successful, the quality control department issues a certificate of approval; once this is issued, no more oil products can be poured into that tank – they must be sent out for sale. If you say that changes in quality occur after the tank is sealed, due to variations in temperature or something similar, then I personally don’t think that’s the case. As long as the tank is properly sealed, fluctuations in temperature (or large differences in temperature) should not have an impact on the quality of the oil.
After the tank is sealed, there are many valves in front of it, and these valves are not airtight; as a result, the risk of oil leakage is high. If only samples are taken from the tank, it’s difficult to ensure 100% reliability in terms of quality throughout the entire production cycle. What I’m asking is: isn’t there any step in the refinery’s process, such as sampling before loading onto vehicles, to ensure that quality issues don’t occur before the products leave the factory?
We do the first train, but we don’t do cars either. It depends on the specific circumstances; if everything is done, the work efficiency will be too low.
It’s not specified in the regulations (at least we don’t have it). In the situation you mentioned, it’s possible to add samples depending on the actual circumstances, but the quality control team will curse at you severely. I used to work in scheduling as well, and similar situations occurred there; every time the teams below requested additional samples, we had to ask the quality control department to do so in an authoritative tone, which eventually led to problems on the part of the quality control staff.
Oh, we install an online analyzer before the setup, as a basis for production control. The quality inspection of the refined oil inside the tank is carried out 24 hours after the tank is sealed. Our factory is several kilometers away from the loading dock, and the pipelines are used for separate transportation, so there is no risk of oil mixing.
I would like to ask whether your online sampling analysis can be put into use immediately? Do we still have to collect data first? Here at our facility, we also have automatic sampling and analysis as well as online blending, but according to the manufacturer, it takes about a year to accumulate enough data for sampling. It’s been several years with no progress; currently, engineers still manually calculate the ratios and then issue commands to the operators.