Hi!

Good Day to Users of V94.3 Siemens GT:

We have recently experienced a failure of the Natural Gas (NG) Unloading Valve (solenoid-operated valve) coil on a Siemens V94.3 gas turbine during unit operation. The issue involved overheating of the 220V DC coil, leading to melting of the coil body and unintentional valve actuation, resulting in NG release and subsequent unit trip.

We are currently reviewing the root cause and exploring permanent corrective actions.

In this regard, we would like to kindly ask if any of you have encountered a similar issue at your site:

• If yes, what were the observed symptoms and operating conditions?
• What corrective or preventive actions were taken?
• Was any design or component modification recommended or implemented?
• Have you engaged Siemens or any other OEM for support or alternative solutions?

Any feedback or shared experience from your side would be highly appreciated and will support us in determining a robust and reliable solution.


Thank you in advance for your cooperation.

 

Hi!

Good Day to Users of V94.3 Siemens GT:

We have recently experienced a failure of the Natural Gas (NG) Unloading Valve (solenoid-operated valve) coil on a Siemens V94.3 gas turbine during unit operation. The issue involved overheating of the 220V DC coil, leading to melting of the coil body and unintentional valve actuation, resulting in NG release and subsequent unit trip.

We are currently reviewing the root cause and exploring permanent corrective actions.

In this regard, we would like to kindly ask if any of you have encountered a similar issue at your site:

• If yes, what were the observed symptoms and operating conditions?
• What corrective or preventive actions were taken?
• Was any design or component modification recommended or implemented?
• Have you engaged Siemens or any other OEM for support or alternative solutions?

Any feedback or shared experience from your side would be highly appreciated and will support us in determining a robust and reliable solution.


Thank you in advance for your cooperation.

Hi...
Recently we have also experienced same issue of NG Unloading Valve coil failure.

Can you share response from Siemens/ OEM/ your findings regarding this issue ?

 

Hi...
Recently we have also experienced same issue of NG Unloading Valve coil failure.

Can you share response from Siemens/ OEM/ your findings regarding this issue ?

Thanks for your query.

we requested or concern department to approach to Siemens with our concern and waiting for feedback.

can you share your experience and photos of coil and valve body of the said valve with valve data sheet? Compartment temperature and unloading valve body temperature while unit in service and rated temperature? Etc… if you can..

Thanks