Recent content by alwaysahobbyist

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    Yokogawa FCS Time Drift Issue

    We recently upgraded CS3000 to Centum VP. Yokogawa DCS. Processor CP471. After the commissioning was done, things went smoothly for a few months. Later some DPR data started drifting off and DPRs were not getting generated at correct times. After investigation it was found that the CPU time is...
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    Sudden Load Fluctuations: Causes?

    Sorry for the delay in posting a feedback. Perhaps our folks are looking at a Fuel Control Card Issue. Its not yet established but trying to check it in another running machine and see if the responses match. Meanwhile, I dont have a word on the APD frequency thing. Its there in the drawing...
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    Sudden Load Fluctuations: Causes?

    Okay, I get it... Lemme confirm S2's exact role tomorrow...!! Its late here...!! Thanks again and regards
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    Sudden Load Fluctuations: Causes?

    I am not very sure of APD Freq thing...!! Wud try and fetch details tomorrow...!! The PCV is at the upstream of GTs Fuel Control Valve (The Governor)...!! The PCV ideally is supposed to keep the pressure at the inlet of FCV constant (15 - 16 Kgs)...!! However, its not functional for some...
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    Sudden Load Fluctuations: Causes?

    PMA is Permanent Magnet Alternator Electrical Load is mostly Gas Lift Compressors - Range 650 to 700 kW... Gas Injection Plant basically injects high pressure Gas into the formation to boost Oil pressure and help it come to the surface. Some smaller compressor loads are also present - about 100...
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    Overfueling with load grab 6-20MW in 5 seconds

    I am no expert on turbines... But as someone who worked long back with Mark II systems for sometime, I recall there used to be an acceleration control feature in MK II machines then...!! The feature (usually manifested as a light on the front panel) would kick in whenever the rate of change of...
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    Sudden Load Fluctuations: Causes?

    Request experts on the forum to kindly help us with the following problem with one of the two Gas Turbines. The problem is being faced by my colleagues in a remote field so am posting their proximate experience here. Pardon me for any missed out information. Have tried my best to collate...
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    What is Process Noise? What are its sources

    In theory we often read about the impact of high freq noise affecting derivative control of a PID Controller...!! Assuming a simple Level or Temperature Control Loop of a static process vessel, what would Process Noise be like...!! What would be the sources of Process Noise which can affect...
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    High Pressure Compressor Tripping on Surge during Start up

    Compressor Details: Gas compressor, Dresser Rand, Siemens PLC, Two Custom Controls Anti Surge Controllers (One for each stage), Two Stages, Centrifugal Compressor, Inlet Pressure ~5 Kgf/Cm2, Discharge Pressure on full load ~66-70 Kgf/Cm2... While trying to load the machine, the compressor...
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