Dear Sir
Thank you very much for your kindly reply.
I would like to clearify the point you mention in the following:
1. The new drawing pdf file was attached but I still miss the inlet line with its on-off valve to the tank.
2. The valve C in the previous post should be control valve. This is my typo.
3. The PEG is the product in the tank and will be transfered to the drumming and isotank.
4. The valve to the drumming is 1-1/2" with 68% opening. (This is vender information and I would really appreciate that you show me any useful sofeware website for calculating %open and cv value)
5. The filling operation are manual operation. Operator can manualy open the block valve first, and the light will kept green for 1 min if the block valve is not closed by this operation. And, then operator will start the
process through lock push button in 1 min to start the flow control valve D.
6. The minimun flow by pass valve is on-off valve and orfice ( not show in the drawing). The on-off valve setting is for the fully recircultion flow when the drumming/isotank not in operation state..
7. Sorry, I still not show the level transmitter on the tank and psv valve on the tank. The tank is operatiing in ATM.
8. The flulid storing is PEG.
My question is:
1. Is any premissive interlock should be put on the valve upstream drumming/isotank? For example, if ZSO-B(on-off vlave B limit swith is not actuated), the wrong message will show on the DCS panel.
Thank you very much for your help.