METHOD OF WASHING TANKS FOR OIL, OIL PRODUCTS OR HAZARDOUS FLUIDS AND EQUIPMENT THEREFOR Russian patent published in 2016 - IPC B08B9/08 B08B9/93 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to safe cleaning of tanks for storing oil products and other dangerous fluids, contact of which with air is not allowed. Oil or dangerous fluid medium is pumped out from tanks with simultaneous filling of freed space with gas inert in respect to tank content. Tank is washed in inert gas medium by means of hot sea water mainly with detergent additives, followed by displacement of contaminated inert gas from the tank by ballast sea water with subsequent water pumping. After pumping out ballast sea water tank is filled with clean inert gas. Tank is blown by inert gas, then degassing-substitution of inert gas with air is performed, tank is ventilated with air to ensure access for personnel and carrying out examinations and required operations. Equipment complex includes washing monitors, instrumentation, immersed pumps with hydraulic drive and pipelines for pumping out washing water, installed on tank bottom, centrifugal high-pressure pumps with hydraulic drive to supply washing water, hydraulic station to allow operation of hydraulic equipment.

EFFECT: possibility to clean tanks automatically in safe inert medium, avoidance of oxygen containing gas medium access to storage tanks and risk of pyrophoric deposits inflammation prior to the end of drying, washing, cleaning, degassing and ventilating tank, safety of tank washing process on structure located in open sea or in coastal areas.

9 cl, 2 dwg