Safety Data Sheet
Oil Tank Cleaning CGII Site Operating Procedures
- Tend to Corporate Health, Safety, and Environmental requirements.
- Define and isolate the work area(s).
- Record the fluid volume contained within the tank, the tank capacity (bbl size), and determine if the service fluids are sweet (not bearing hydrogen sulfide) or sour (those bearing hydrogen sulfide).
- Isolate the tank with a lock-out/tag-out technique.
- Using tank and vacuum trucks, drain free volumes from the tank.
- If required, arrange for a supplied air trailer on location.
- Insert a stinger into an available valve and remove free debris (sand/solids) with the use of a combo-vac or a pressure truck and vacuum truck combination.
- If required, open the top hatch and purge the tank with air or nitrogen.
- Remove the access hatch and test for atmospheric properties. Equip workers with supplied air.
- Insert a gamma-jet agitator into the tank and feed the line through the stinger. This may be installed through the stinger tool (depending on valve size).
- Reinstall the access hatch to limit spraying.
- Confirm the presence of a hotsie (or equivalent pressurized heating device). Fluids must be in the 160 to 185 Fahrenheit range to effectively remove heavy oil. The hotter the fluid, the easier cleaning will be.
- Slipstream the treating chemical into the hotsie feed stock.
- Cycle hot treating fluid through the hotsie at maximum rate and pressure for the gamma jet for a period of 1.0 to 2.0 hours (timing is dependent on factors such as oil viscosity, gamma jet/hotsie throughput, and available heating capacity).
- Recommended volumes of CG-100 (these volumes can be adjusted based on site-specific observations):
- 400 bbl tank: 2 – 3 pails of CG-100
- 750 bbl tank: 3 – 4 pails of CG-100
- 1,000 bbl tank: 4 – 5 pails of CG-100
- Use a vacuum truck to remove the liquids from the bottom of the tank.
- Remove the access panel and assess for residual oil on the walls.
- If required, pressure wash the tank walls under the protection of supplied air.
- Squee-gee remaining fluids from the tank bottom. Remove cleaning equipment from the tank.
- Fully re-install the access panel.
- If the intent is to return the vessel to service, resume flow.
- If the intent is to remove the tank, consult engineering for additional preparatory requirements to facilitate a move (e.g., stairway/instrumentation/burner tube removal).