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GMT 23.08.2011

Through CE(I)/AGM(ME)

Sub: Retrofitting of TATA Honeywell IPC620 system.

Ref: MPR No:4198 dated 27/01/2009

We have raised the above MPR to replace the TATA

Honneywell IPC-620 system as it became obsolete. Offersreceived and the technical evaluation with recommendation

forwarded for approval and release of purchase order. But till

date the P.O is not released and on enquiry it is understood

that the file is with MD for approval.

Even though DCS is the most accepted process control

system for a continuous process plant we had gone for PC_PAC

system because of the very high cost of DCS during that period.The following are the other advantages if we go for YOKOGAWA

DCS system

1. We have YOKOGAWA DCS for our AGC and UHDE-I

Plants and so our Engineers who are operating the DCS and

maintaining the systems are trained and comfortable with

it.

2. DCS is more suitable for continuous process plants.

3. It is a proven system as far as our plants are

concerned and Globally.

4. We a have a local support team performing

satisfactorily as of now.

5. The system offered by M/s YOKOGAWA is latest and

more suitable.

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Now the pricing has come down and is comparable with PAC

system. We have taken a budgetary offer from the DCS supplier

and it is approximately Rs. 29 Lakhs where as the PAC systemwas about 34 Lakhs.In this context, it may be worth considering

the DCS because of the above advantages, both technical and

financial.

Decision in this regard may be taken at the earliest since we

cant do anything if the present system fail, which can happen

any time since its obsolete and no support is available. With

DCS process optimisation including hydrogen utilisation can be

carried out in a better way. We can monitor hydrogen pressure

at burner inlet and can even think of controlling the Hydrogen

valve from DCS. Please note that all Instrumentation, Operation

engineers and DCS operators in the control room prefer goingfor YOKOGAWA DCS because of their familiarity with the

system.

Instrumentation. DM(I)