Oil refining systems used for upgrading heavy oil, bitumen, tars, shale oil or refinery residues to lighter, lower viscosity products, for desanding oils storage tanks in the oil and gas industry, for maintaining oil tanks by removing slug from hydrocarbon storage tanks in the oil and gas industry, for pre-treating and dewatering crude emulsions in the oil and gas industry; for the separation of oil and water in the oil and gas, marine, power, steel, and automotive industries which produce by...