Valves management in automatic modality allows the system to carry out the compressor pressurization before the compressor starts, without the operator’s intervention. It also manages the permissive to start and the compressor trips. Every panel is composed of one SIEMENS WinCC SCADA supervision systems installed in the computer on front panel.Ĭontrol system manages all the auxiliaries and the machine, valves through automatic or manual sequences. In each panel the PLC SIEMENS 400H in “hot-stand-by” redundancy configuration is installed. SSE supplied the Unit Control Panels (one per compressor) and SSE technician operates during commissioning activities providing also technical assistance during all critical start-up phases of the cycle. Compressor loading procedure can be automatically “paused” if overload is approaching to occur.Flow measure compensation using measured propane gas pressure and temperature to allow the maximum closing of antisurge valves before the speed increasing.Dedicated start-up procedure to allow the maximum closing of antisurge valves before the speed increasing.To avoid this some dedicated functions are developed in the control system: These means that, when compressor starts, electric motor overload trip could occurs. In really, when plant starts for the first time, propane gas conditions shall be very different from design conditions: propane temperature shall be close to environment temperature and propane pressure depends on the amount of propane which has been used to pressurize the cycle. This process has a particular start-up procedure because electric motors and compressors are designed to operate at process working condition: propane gas in compressors suction should be close the vacuum pressure and temperature should be 10☌ as maximum. Propane gas is used as refrigerant gas in the process.Īll liquefaction processes are similar and are realized using two compressors of the same type.įollowing figure shows a SIMPLIFIED LAY-OUT OF THE STATION: Liquefaction plant exploits the freezer cycle concepts as show in the following figure: Vorecon system is installed between electric motor and compressor to allow the control of compressor speed changing electric motor torque. Plant consist of three different compressors type driven by electric motors installed on different natural gas Liquefaction processes: number 6 compressors named V6 (Nuovo Pignone 3BCL525 centrifugal compressor), number 2 compressors named V2 (Nuovo Pignone 3BCL606 centrifugal compressors), number 2 compressor named GB2 (Nuovo Pignone BCL503 centrifugal compressors).Įlectric motors operate at fixed rotating speed. PLANT LOCATION: IRAN – SOUTH PARS – ASSALUYEH PROJECT DESCRIPTION << ROTATING EQUIPMENT ENGINEERED SOLUTIONS AND SERVICES CENTRIFUGAL COMPRESSOR CONTROL
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