Purifying technology of ship tanks by the set of the MKO-1000 was introduced by the company "Pure World M" ("Чистый Мир М") in 2001, held numerous practical tests and modifications, and became known throughout the world. The technical detergent used in the technology, is one of the best detergent for washing the internal surfaces of tanks and reservoirs.
For washing the ship tanks the purification complex MKO-1000 is based in port, for which allocated a place on the pier. Washing station has several backup tanks to drain the recoverable oil and condensate liquid gas ballast and bilge water, sludge and solids. More expedient to build a wash station for washing of oil tankers and tankers flushing gas tanks - LPG carriers.
Washing station operates in a closed cycle, the heating of the washing solution is produced by the latest coolants (isothermal oil), so heat loss is kept to a minimum, and for the removal of heavy sediments are used eroded hydrocarbons, heated to 120 degrees or more. This technology is environmentally friendly, because the technology of washing tanks of vessels is operated in a closed cycle with pumping waste solutions, what prevents harmful emissions into the environment. At the washing station installed mobile unit for disposal of waste and sludge recovered so harmful emissions from landfilled waste excluded.
Specialists of "Pure World M" ("Чистый Мир М") have developed a technology for cleaning washed off oil residues and gas hydrocarbons from contamination, based on separation of aqueous solution and hydrocarbon using a special formulation with high demulsibility. Using physical, chemical and technological methods of practical application, the company has fulfilled the optimal composition of the reagent for various contaminants and methods of purification. The detergent is used as an aqueous solution with a working concentration of 1-3%, belongs to the 4th class of danger. Its structure includes polyelectrolytes, which activate the cleaning process, corrosion inhibitors, anti foam additives, demulsifiers, and other substances improving washing efficiency of tankers. Thus, a high quality of washing tankers and process safety is provided. Aqueous solution is applied in multiple steps with the temperature used 60-90°C in a closed loop, without waste and loss. The use of the aqueous solution in the tanks in the form of hot jets produced by a washing machines of the brand "MMT" developed by "Pure World M".
Washing machine is lowered into the tanks through special hatches diameter of 318 mm, which are located at a distance of 6-10 m from the bulkhead tanks for optimal washing of walls. Location deck hatches is that after washing tank washing machines need for manual labor is eliminated. Deck hatches capped with quick-devices..
Full cycle wash compartment of the tank cleaning machine lasts 10-15 minutes, the number of cycles is up to 100 per ton of deadweight tankers for large (more than 10 000 tonnes). For quality washing sections of the tank machine is lowered or raised alternately. The capacity of the complex of the MKO-1000 for the aqueous solution contains 16 m3. Access hatches, as a rule, is carried out on the open deck to dissipate the toxic and explosive gases in the atmosphere. Surface cleaning tanks by new technology, can significantly reduce heat loss, energy consumption, shorten the duration of treatment, and to make the process continuous and accurate. In addition to washing machines used ejectors for better washing tanks, pumping of oily emulsions produced by membrane pumps. The aqueous solution can be used in the next cycle, and cleaned with special filters oil product returned to the customer. Immediately after rinsing tanks and extract impurities carried rinse tanks of hot clean water using washing machines, which is held for 30-40 min., Then degassed tanks are dried and ventilated.
Flushing gas tanks of tankers characterized in that the liquefied gas is much purer than the crude oil. After pumping the liquefied gas from gas holder at the discharge port at the bottom of it remains water up to 3%, and the precipitate impurities in the form of condensate gelatinous mass within 0.1%. Liquefied natural gas from the gas tank is pumped to the end, since the transport of its pressure up to 5 MPa. Given the slope of the bottom wall of the gas tank and bulge outward, bottom residues LPG easily bilge pump complex MKO-1000. Water during the passage of residues from the bottom of the gas tank is separated in a complex MKO-1000, a solid mass of the product gas is separated and subsequently processed as slime.
After cleaning the tanks the inspection is held, then issued various certificates (to allow for loading, on the compatibility of the internal coating of tanks on degassing of complete unloading cargo, etc.). Inspection conducted by independent tanker companies or authorized surveyors. Before acceptance and inspection of the tank held its additional degassing.
*) heat-generating plants and diesel generator are set in the absence of on-site heat and power.
Disposal of residues from the bottom of tanks of ships, regardless of the type of sludge is the most important part of the final process of washing and cleaning of tankers. Oil sludge residues obtained after the separation of the bottom sediments of marine tanks using the technology of washing stations can be utilized on specialized equipment for environmentally friendly technologies. The technological process of disposing of sludge by removing sediment oil and other hydrocarbons maximizes valuable petroleum extract of the sediment in tankers. Work done in the purification tank farms using equipment MKO-1000 in practice has shown that the sediments consist of oil (from 20% to 85%), water (10% to 40%) and solids (from 5% to 15%) . Mechanical impurities in a composition containing sand, clay deposits, resins, asphaltenes, abrasives and other contaminants. During the work on the erosion and pumping sludge, mainly composed of oil, sediment, mixed with technical detergent to form a water-oil emulsion "oil in water", together with suspended solids that when pumping is removed together with the emulsion tank.
Technical detergent has a unique feature: an aqueous solution concentration of 1.5 - 3%, forming emulsion "oil in water" in the course of cleaning jobs in a short time in the quiescent state fall into oil residues washed off and the aqueous solution. This aqueous solution maintains its cleaning properties. This is extremely important, since it allows to use the working solution in the working mode, and the technology is characterized by its wastelessness.
Cleaning pipes inside cargo tanks and placed on the deck pipelines operating in a contactless manner using detergent. Before the process of cleaning pipes and pumps the washing station system is connected to the ship pipelines (input - output) and due to the circular motion of the cleaning solution on the ship's highways and MKO-1000 carried out cleaning and removal of sediments and oil residues.
Tanks of ships, as well as vertical steel tanks engaged in a closed lopp, so any special conditions to ensure the isolation of the working area by means of an inert gas is not required. In an extreme case, for this purpose can be used a water saturated steam.
The capacity of the tank washing machine, designed and manufactured the holding company "Pure World M» — 24 m3/h, manual hose — 12 - 15 m3/h.
The final operation of degassing, drying and ventilation can be performed with the help of the air handling unit of MKO-1000, and with the help of the degassing unit posted on the washing station.
Tanker ballast, of course, will affect the time the cleaning process, but the quality of the work performed is not affected.
Demurrage at the pier will be much shorter than the traditional methods of cleaning tanks, as the available means of mechanization of the proposed substation allow virtually eliminate manual labor and due to this increase productivity.
