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from the Instrumentation department...
Ratio Control
Engineering topic
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Posted by Nasir Rais on 10 April, 2008 - 12:55 am
There is an inlet separator in one of the offshore platforms. It has a level transmitter on it. The discharge line has pumps (3 pumps). Immediately after the pumps there is a flow transmitter. Then there are 3 control valves in parallel. After the 3 valves, the 3 lines meet to form a discharge header. This header downstream is divided into 2 lines going to 2 different locations. Now the discharge to these 2 lines is to be ratio controlled with level transmitter providing the set point. The setup is such that one flow transmitter is immediately after the pumps providing the totalized flow and at one of the branches after the pump header there is the second flow transmitter. What I want to ask is that if I connect the level transmitter such that it provides a set point to the flow tranmitter and the output of the flow controller goes to the ratio controller block and the other flow transmitter is directly connected to the ratio controller block... can the ratio controller provide ratio control to the valves on each branch?? In case this is not possible, what can be done??

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