Home › Forums › Coking › Technical › Antifoam, Quench Oil, Level Control › Antifoam › Coker Operating Pressure vs Antifoam Consumption This topic contains 0 replies, has 1 voice, and was last updated by Freddy Martinez 13 years, 4 months ago. Author Posts September 30, 2009 at 12:56 pm #2986 Freddy MartinezParticipant Can anyone help me with this? When the coker drum pressure increases: – the coke yield – C4 and lighter gas yields both increase, but – the total liquid yield decreases, because more HCGO remains in the drum and is converted to lighter products. Being so, can we expect the antifoam consumption to increase when P increases? Author Posts You must be logged in to reply to this topic.