An effective tankage pretreatment programme stabilizes crude oil quality by maximising the amount of water removed from the crude prior to being charged to the crude unit. Feeding a more stable and consistent crude quality to the desalters reduces the risk of upsets, ensures performance is under control and minimizes the risks to downstream process units. With decades of experience, we offer products that complement our desalter treatment programs to enhance water separation and removal.
Crude oil receipts that have basic sediment and water (BS&W) levels above 0.5 percent can potentially benefit from additional water separation. Tankage pretreatment (dehydration), in which specific demulsifer chemistry is added to the crude as it is received, is often recommended under the following conditions:
Crude receipts are inconsistent in quality (usually barge or tanker shipments)
Crude receipts contain >0.5 percent water
Poor water/oil separation is seen in tank farm operations
Salt concentration in the desalted crude is consistently high
The desalter system is running at or above design resulting in overhead chloride targets that are difficult to achieve.
Stabilizing the quality of the crude being fed to the desalters often results in reduced demulsifier dose rates at the desalter and a reduction in the frequency of desalter upsets and their associated impacts on downstream units.