SU1705181A1 - Method of cleaning segregated ballast tank of mud - Google Patents

Abstract

The invention relates to shipbuilding, in particular to methods for cleaning isolated tanker ballast tanks by washing, and can be used in cleaning tanks from silt deposits. The purpose of the invention is to increase the cleaning efficiency by ensuring that the downward flow moves relative to the bottom of the tank. The hose 1 is laid at the bow bulkhead 2. and the hose 3 - at the aft-4. The hoses are equipped with regulating valves 5 and 6. At the beginning of operation, the air with maximum pressure is supplied to the hose 1 through the valve 5, and a circulation flow is formed that covers the entire skimming. After some time (say, 0.1 times the full cycle), the valve 6 of the hose 3 opens. As a result, a second circulation loop is created, pushing the persian loop away from the aft bulkhead. As the air pressure in the hose 3 rises, the front shifts to the middle of the tank and, if the pressures are equal, in both hoses it is installed in the middle. Then by gradually closing the valve 5, the pressure in the hose 1 is reduced, as a result of which the front shifts to the bow bulkhead and reaches it with the valve 5 completely closed. After a pause, by gradually opening the valve 5, the operation of moving the front in the opposite direction to the aft bulkhead is repeated . 3 il. (Ls

Description

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The invention relates to shipbuilding, in particular, to methods for cleaning insulated ballast tanks of tankers by means of promshka. and can be used - - .. to clean the tank sediment from silt.

Target- - gain - increased cleaning efficiency by ensuring the movement of the downward flow relative to the bottom of the tank.

FIG. 1-3 shows a scheme implementing the proposed method.

Hose 1 is laid at the bow bulkhead 2, and went ngZ-at the aft bulkhead 4. The hoses are equipped with shut-off and control valves 5 and 6 .. In addition, position 7 denotes the bottom of the tank, position 8 - the bottom of the vessel.

The method is carried out as follows.

At the beginning of the operation (Fig. 1), air with maximum pressure is supplied to the hose 1 through the valve 5, in this case a circulation flow is formed, covering the entire framing. After some time (say, 0.1 times the full cycle), the valve 6 of the hose 3 opens. As a result, a second circulation loop is created (Fig. 2), pushing the first loop away from the aft bulkhead. As the air pressure in the hose increases, the front-end moves toward the center of the tank and, if the pressures are equal, the two hoses are installed in the middle. Then, by closing the valve 5 by closing, pressure in the hose 1 is reduced. As a result

the front shifts to the nasal bulkhead and reaches it when the valve 5 is completely closed (FIG. 3). After a pause, by gradually opening the valve 5, the operation of moving the front in the opposite direction to the aft bulkhead repeats in reverse order.

Thus, by changing the time pressure of the late for hoses 1 and 3, you can

achieve the movement of the collision flow front from one bulkhead to another and vice versa. The current as the direction of flow in the front is perpendicular to the surface of the sludge, it has an additional dynamic effect on it.

The invention of the method of cleaning an isolated ballast tank from sludge, including the creation of circulating water flows by supplying air through races, fed devices, characterized in that, in order to increase the cleaning efficiency by ensuring the downward movement

flow relative to the bottom of the tank, the air is supplied periodically with variable flow through two switchgears located at the bottom along the fore and aft bulkheads of the tank, and in each period, reducing the air flow from one switchgear to zero, simultaneously increasing the air flow from another switchgear to maximum.

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Claims (1)

Claim A method of cleaning a tank of insulated ballast from sludge, including the creation of circulating water flows of 20 by supplying air through switchgears. Characterized in that, in order to increase the cleaning efficiency by ensuring the movement of a downward flow of 25 relative to the tank bottom, air is supplied periodically with a variable flow rate through two distribution devices. located at the bottom along the bow and stern bulkheads of the tank, and in each period, reducing air flow from one switchgear to zero, at the same time increase the air flow from another switchgear to the maximum.