Method for reducing silicone antifoam usage in delayed coking processes

A method for precluding foam-over during a petroleum coking operation comprising:

• filling a coke drum with a coke feedstock;
• monitoring the coke feedstock level within said coke drum;
• stopping flow of coke feedstock when said feedstock occupies from about 66% to about 80% of the internal volume of said coke drum;
• injecting an anti-foam agent into said coke drum wherein the volume of the anti-foam agent is sufficient to preclude a foam layer on the surface of said feedstock from entering an overhead line carried by said coke drum and, wherein said step of injecting an anti-foam agent begins when said drum is filled between about 60% to about 70% of its total internal capacity;
• wherein said anti-foam agent comprises silicone and a carrier fluid, wherein said carrier fluid has an aromatic concentration by weight greater than 90%.