1.Adding antifoam in the feed is not acceptable as anti foams work with surface tension principle.To supress the foaming it has to be added on the Surface.The maximum possibility of foam generation is expected in the VL Separator as the circulation is forced and chances of foam due to heavy turbulence.
2.We feel the stair case width is much lesser , any how we shall getback to you after checking the industrial  norms.It is also not convenient for the men movement.
3.Indicate the nature of internal surface finish for the process euipment.
4.Let us Know the PLC and HMI Make. 