english 
The safety distance regulations for waste oil tanks are mainly aimed at preventing fire, explosion, and oil leakage accidents, protecting the safety of people and property, and reducing environmental pollution. Here are some common regulations:
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Distance between Tanks
For waste oil tanks with a capacity of more than 15,000 gallons (56,780 liters), if the tank construction is not fire-resistance-rated, the separation distance should be at least 1.5 times the diameter or 15 meters, whichever is greater. If it is fire-resistance-rated, the separation distance should be at least 0.75 times the diameter or 7.5 meters, whichever is greater.
For smaller-capacity tanks, specific local regulations or industry standards should be referred to. Generally, the distance should be enough to prevent the spread of fire and the impact of an accident in one tank on adjacent tanks.
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Distance from Surrounding Facilities
The waste oil tank should be at least 18 meters away from open flames or spark-emitting locations to avoid ignition of the oil in the tank.
It should be at least 18 meters away from outdoor substations to prevent electrical fires from affecting the tank.
The distance from non-fire-rated eaves of buildings, non-fire-rated structures, and openings in fire-rated structures should be at least 1.8 meters. The distance from non-fire-rated boundaries should be at least 0.76 meters, and that from foliage and vegetation should be at least 0.6 meters.
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Distance from Overhead Circuits
Overhead circuits should not cross over the waste oil tank, and the safe distance should be at least 5 meters to avoid the risk of short-circuits and fires.