Tank truck cleaning method
There are four methods for tank cleaning, namely dry cleaning, wet cleaning, steam cleaning and chemical cleaning.
1. Safety requirements and procedures of the Dry Cleaning Law
1. Eliminate the oil in the tank;
2. Ventilate the oil and gas in the tank and measure the oil and gas concentration to a safe range;
3. Personnel enter the tank to clean up oil, water and other sediments;
4. Dry clean with sawdust;
5. Remove sawdust and use copper tools to remove local corrosion;
6. Wipe thoroughly with a mop;
7. Dry cleaning quality inspection and acceptance.
2. Safety requirements and procedures for wet cleaning
1. Eliminate the oil in the tank;
2. Ventilate the oil and gas in the tank and measure the oil and gas concentration to a safe range;
3. Personnel enter the tank to clean up oil, water and other deposits
4. Use 290~490Kpa high pressure water to flush the oil and floating rust in the tank;
5. Remove the flushing sewage as soon as possible, and wipe it with a mop;
6. Dehumidify with dry wind;
7. Use copper tools to remove local corrosion;
8. Wet cleaning quality inspection and acceptance.
3. Safety requirements and procedures of steam washing method
1. Eliminate the oil in the tank;
2. Ventilate the oil and gas in the tank and measure the oil and gas concentration to a safe range;
3. Personnel enter the tank to clean up oil, water and other sediments;
4. Use steam to clean, this method mainly cleans the sticky oil tank;
5. Use high-pressure water to wash oil stains, drain sewage, and dry clean with sawdust;
6. Remove the sawdust and use a copper tool to get out the local rust;
7. Use the mop to completely remove the stolen goods;
8. Check and accept the quality of tank washing
4. Safety requirements and procedures of chemical washing method
1. Eliminate the oil in the tank;
2. Ventilate the oil and gas in the tank and measure the oil and gas concentration to a safe range;
3. Personnel enter the tank to clean up oil, water and other sediments;
4. Use the tank washing machine to spray water to flush the system and equipment;
5. Pickling and rust removal for 90~120min;
6. Remove the acid, rinse with clean water for about 20 minutes, and make the rinse fluid neutral;
7. Drain the sewage and do 2 passivation treatments, the first time is about 3 minutes, and the second time is 8 minutes;
8. 5~10min after passivation, rinse with 290Kpa pressure water for 8~12min;
9. Drain the flushing water and wipe it with a mop;
10. Ventilated and dry;
11. Check and accept the quality of chemical tank washing.
Safety precautions when cleaning the oil tank
Oil tank cleaning is a relatively dangerous operation in the tank, because the oil vapor is not only flammable and explosive, but also toxic. Therefore, the following safety regulations must be strictly observed when washing tanks.
1. Open the manhole, check the quality of the oil at the bottom of the tank layer by layer, and determine the oil removal and treatment plan.
2. The person entering the tank must wear work clothes, work shoes, work gloves, and gas masks. Also bring a signal rope and a safety belt, and a special person outside the tank should supervise the tank. The time for entering the tank should not be too long. Generally, 15~20min is appropriate and work in shifts. In addition, there should be medical staff on duty
3. Use brooms or wooden tools to clean residual oily sewage, and it is strictly forbidden to use iron and steel tools.
4. Effective ventilation must be used.
5. Steam method-all holes in the tank should be closed at the beginning. When the temperature reaches 60~70℃, open the cover and continue steaming until the residual oil in the tank is completely dissolved. The cleaning of oil tanks must follow the requirements of regulations and strict operating procedures to minimize the hazards of cleaning and operations in the oil tank.
