Safety technical code for cleaning of double layer oil tank

1. The oil tank cleaning operation department shall, according to the different conditions of the operation site, formulate specific and feasible oil tank cleaning scheme and safety measures. The commander of oil tank cleaning must be present at the site during the oil tank cleaning operation to solve and deal with the problems found in time. The scheme and safety measures of oil tank cleaning shall be implemented after discussion and approval by the manager in charge.

2. Before the double layer oil tank cleaning operation, the relevant personnel shall be given pre job education on safety and related pressure vessel cleaning operation technology according to the division of labor, and they can only take the post after passing the assessment. When there are operators inspecting the pressure vessel, a full-time supervisor shall be set outside the manhole of the oil tank, and one supervisor shall not supervise two operation points at the same time. The safe distance shall be determined in the workplace, safety boundary markers or fences shall be set, and special personnel shall be responsible for monitoring the safety boundary markers or fences.

3. When the concentration of oil and gas exceeds 1% and is lower than 4% of the lower explosion limit of the oil, the operators are allowed to enter the tank for operation in a short time without breathing apparatus, but they shall wear gas mask and each operation shall not exceed 15 minutes.

4. When the concentration of oil and gas in the tank exceeds the allowable value due to the impact of operation, the operators shall evacuate from the site quickly. Ventilate again until the concentration of oil and gas drops to the specified value, then continue the operation. 5. When the concentration of oil and gas in the oil tank and its working place exceeds 20% of the lower explosion limit of the oil product, the area within 35 meters (the horizontal oil tank can be reduced by 50%) is a fire and explosion dangerous place. When entering the place to clean the oil tank, the electrical equipment and its installation introduced into the place must be in accordance with the relevant national regulations on safe electricity use, and the iron and other phases shall be strictly prevented in the place To hit.

6. Before double layer oil tank cleaning, a proper amount of fire-fighting equipment shall be equipped in the upwind direction of the work site, and the on-site fire watch personnel shall make full preparation for fire fighting.

7. It is strictly prohibited for oil tank cleaning operators to wear chemical fiber clothing, chemical fiber ropes and chemical fiber rags, etc. gas detection personnel must wear anti-static clothes and shoes.

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