The process of Crude Oil Storage Tank Cleaning is somewhat a challenge to many. It is a comprehensive activity involving the removal of the bottom crude oil sludge, treating the oil sludge and washing the receptacle . There is the conventional method of washing it and several scientific methods that come up every day as research goes on.
Starting with the conventional method, the sludge is manually removed from the tank bottom. It may take about 100 days depending on the number of personnel working on it and the machines being used. With more operators it can even take 2 months. At times tank cleaning machines that are remotely operated are used; this can take double the time taken above.
The removed sludge is then treated in the second step. It is separated into oil, solid wastes and water. The process is done right in the storage chamber before pumping it out of system.
After removing and separating the sludge the tank will then be washed in the third stage. It involves the use of high pressure cleaners that washes the walls, roof and floors of the storage chamber. This process includes de-rusting by the use of sand blasting and may take between 40 to 60days. For two teams working concurrently, this may take around 30 days to complete. The external walls of the storage chamber also require another thirty (30) to sixty (60) days to de-ruts and de-paint. However if ultra-high pressure cleaner is used, this process can take very few days though it is more expensive.
There is also a one step tank cleaning technology in use. It is more efficient than the conventional method and takes relatively less time. Here, nozzles are fitted on top the storage chamber and diesel is pumped through them into the sludge. This washes the sludge after which the mixture of diesel and sludge is pumped out of the receptacle.
Using this method may be efficient but some solid sludge may take time to dissolve. For a 100,000KL tank this may take up to 4 months to dissolve. Temporary storage of the diesel/sludge mixture should be made as it is planned how to separate them into oil, solid and water. Another receptacle is required to contain the pumped out mixture when a receptacle is being cleaned.
The other method is a two step washing procedure. This is very advanced and way more effective than the first two. Very fast in cleaning and recovers more crude oil in the process. The first step is the use of a rotary jet mixer that is submerged into the sludge. It thoroughly mixes the sludge suspending it in the solution and recovers about 90% of the hydrocarbons. The machine needs 7 days to set up and only 3 days to complete the mixing.
The second step can be skipped if the client feels so. But if there is a need, then the residual sludge is removed. And since it is only 10%, the process will take way less time. And after the thorough and violent mixing, the remaining sludge is quite soft and easy to handle as compared to when using the conventional method of Crude Oil Storage Tank Cleaning.
Starting with the conventional method, the sludge is manually removed from the tank bottom. It may take about 100 days depending on the number of personnel working on it and the machines being used. With more operators it can even take 2 months. At times tank cleaning machines that are remotely operated are used; this can take double the time taken above.
The removed sludge is then treated in the second step. It is separated into oil, solid wastes and water. The process is done right in the storage chamber before pumping it out of system.
After removing and separating the sludge the tank will then be washed in the third stage. It involves the use of high pressure cleaners that washes the walls, roof and floors of the storage chamber. This process includes de-rusting by the use of sand blasting and may take between 40 to 60days. For two teams working concurrently, this may take around 30 days to complete. The external walls of the storage chamber also require another thirty (30) to sixty (60) days to de-ruts and de-paint. However if ultra-high pressure cleaner is used, this process can take very few days though it is more expensive.
There is also a one step tank cleaning technology in use. It is more efficient than the conventional method and takes relatively less time. Here, nozzles are fitted on top the storage chamber and diesel is pumped through them into the sludge. This washes the sludge after which the mixture of diesel and sludge is pumped out of the receptacle.
Using this method may be efficient but some solid sludge may take time to dissolve. For a 100,000KL tank this may take up to 4 months to dissolve. Temporary storage of the diesel/sludge mixture should be made as it is planned how to separate them into oil, solid and water. Another receptacle is required to contain the pumped out mixture when a receptacle is being cleaned.
The other method is a two step washing procedure. This is very advanced and way more effective than the first two. Very fast in cleaning and recovers more crude oil in the process. The first step is the use of a rotary jet mixer that is submerged into the sludge. It thoroughly mixes the sludge suspending it in the solution and recovers about 90% of the hydrocarbons. The machine needs 7 days to set up and only 3 days to complete the mixing.
The second step can be skipped if the client feels so. But if there is a need, then the residual sludge is removed. And since it is only 10%, the process will take way less time. And after the thorough and violent mixing, the remaining sludge is quite soft and easy to handle as compared to when using the conventional method of Crude Oil Storage Tank Cleaning.
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