Open and Closed Dewatering (B-FSM-159)
There are two classes of final dewatering – Open and Closed. The selection depends on the level of hazardous contaminants in the system.
Open Dewatering
- Uses bulk dewatering bag and open frame or covered bin (splash guard)
- Vapors to atmosphere
- Gravity filter/drain of liquid to skid pan and return to open drain
- Solids retained in dewatering bag
- Simple and cheap process and operation
Closed Dewatering
- Uses bulk dewatering bag and enclosed frame
- Vapors captured to vent or process system
- Gravity filter/drain of liquid to enclosed skid pan and return to closed drain or process
- Solids retained in dewatering bag
- Enclosed bin with removable lid, sight glasses, vent, sloped bottom drain, and internal frame to hold dewatering bag
- Bin sits on load cell platform and entire system in frame
- Costly and complex design and operation
References:
- Rawlins, C.H. and Wang, I. 2001. “Design and Installation of a Sand-Separation and -Handling System for a Gulf of Mexico Oil Production Facility”. SPE Production and Facilities, August, pp. 134-140. https://doi.org/10.2118/72999-PA
- Rawlins, C.H. 2019. “Enhanced Production Through Surface Facilities Sand Management.” SPE Distinguished Lecturer presentation. Link here
- Rawlins, C.H. “What to do with Produced Solids after Separation: Dewatering, Transport, and Disposal.”. White Paper Publication, eProcess Technologies. Link here
Next week I will cover the dewatering filter-bag system.
