Archives for ROTATING EQUIPMENT ENGINEERED SOLUTIONS AND SERVICES

<<  ROTATING EQUIPMENT ENGINEERED SOLUTIONS AND SERVICES

TURBO COMPRESSION PIPELINE STATIONS

PLANT LOCATION:     CHINA – VARIUS SITE LOCATION ALONG PIPELINE

 

PROJECT DESCRIPTION

 

West-East Gas Pipeline Project (WEPP) is one of the major natural gas transmission projects intended for the development of the western regions in China.

The project involves construction for gas pipelines connecting the eastern markets of China with the western resources to allow mutual and sustainable development.

Each station is composed by two GE PGT25 + S.A.C. Gas Turbine with Centrifugal Compressor and one station by two Electric Motor + Centrifugal Compressor.

 

PROJECT DEVELOPMENT

 

SSE was involved in the project supplying control panels for eleven compressors station.

 

Turbine Control Panel manages:

• Gas Turbine Speed/Load control through fuel control.
• Start and stop sequences.
• Emergency shutdown and primary protections (as overspeed protection) using dedicated devices.
• Auxiliaries sequences control.
• Process plant control and process valves control.

 

There are two control system installed on TCP.

GE MarkVIe (TMR configuration) dedicated for turbocompressor controls unit and PLC GE Fanuc 9070 (GMR configuration) that manages the critical trips involved in safe and it’s intended as Emergency Shutdown System.

 

MarkVIe TMR control system manages process plant regulation as Load Sharing and centrifugal compressor protection, as Anti Surge algorithm.

  

<<  ROTATING EQUIPMENT ENGINEERED SOLUTIONS AND SERVICES

POWER GENERATION

PLANT LOCATION:     AUSTRALIA – BARROW ISLAND – GORGON LNG

 

PROJECT DESCRIPTION

 

Gorgon project is one of the world’s largest natural gas projects and the largest single resource natural gas project in Australia’s history.
A part of project contemplete the installation of five generator driven by gas turbine MS9001E DLN1.

 

PROJECT DEVELOPMENT

 

Turbine Control Panel manages machine protections, machine auxiliaries and utilities start and stop sequences, process valves, machine start-up and stop sequences, speed controller thought the control of fuel, internal overspeed protection, electrical power control.

A particular algorithm is implemented to control the exhaust quality (DLN1).

There are two control system installed on TCP. GE MarkVIe controls turbogenerator machine and GE MarkVies manages the critical trips involved in safe. MarkVIes, in fact, is designed according IEC61508 “Functional Safety of programmable electronic safety system” to achieve, depending MarkVIes configuration, Safety Integrity Level 3 (SIL3).

MarkVIes than can be used as Safety Control System in Safety Instrumented System (SIS) which includes Safety Shutdown System and Emergency Shutdown System.

MarkVIe control system manages synchronization operations to close Generator Breker (52G). Electrical parameters are acquired make the use of MarkVIe specified modules.

 

 

 

 

 

For this project SSE supplies the five Turbine Control Panels (one per turbogenerator). SSE technician partecipated on gas turbine tests in Customer test area.

<<  ROTATING EQUIPMENT ENGINEERED SOLUTIONS AND SERVICES

CENTRIFUGAL COMPRESSOR CONTROL

PLANT LOCATION:     IRAN – SOUTH PARS – ASSALUYEH

PROJECT DESCRIPTION

 

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).

Electric motors operate at fixed rotating speed. Vorecon system is installed between electric motor and compressor to allow the control of compressor speed changing electric motor torque.

Liquefaction plant exploits the freezer cycle concepts as show in the following figure:

Propane gas is used as refrigerant gas in the process.

All liquefaction processes are similar and are realized using two compressors of the same type.

Following figure shows a SIMPLIFIED LAY-OUT OF THE STATION:

PROJECT DEVELOPMENT

 

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°C as maximum. 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. These means that, when compressor starts, electric motor overload trip could occurs.

To avoid this some dedicated functions are developed in the control system:

• Dedicated start-up procedure to allow the maximum closing of antisurge valves before the speed increasing;
• Flow measure compensation using measured propane gas pressure and temperature to allow the maximum closing of antisurge valves before the speed increasing;
• Compressor loading procedure can be automatically “paused” if overload is approaching to occur.

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.

In each panel the PLC SIEMENS 400H in “hot-stand-by” redundancy configuration is installed. Every panel is composed of one SIEMENS WinCC SCADA supervision systems  installed in the computer on front panel.

Control system manages all the auxiliaries and the machine, valves through automatic or manual sequences. It also manages the permissive to start and the compressor trips.
Valves management in automatic modality allows the system to carry out the compressor pressurization before the compressor starts, without the operator’s intervention.