Centrifugal compressor turbine axial displacement increase
Centrifugal compressor turbine axial displacement increase
(OP)
Hi, we started recycle gas comp. driven by high pressure steam turbine this july after coupling inspection and routine maintenance during turn-around period in our refinery hydrocracking unit. After start up, turbine side axial displacement(to active side) has been increasing step by step and recently almost reaching its trip set 0.6mm. Furthermore, recent trend shows comp. side axial displacement also increasing to inactive side, but lube oil analysis data and color is good condition, temperature of bearings are also in reasonable pigures. With this situation, we are on the verge of deciding somthing to do such as shutting down the unit or operating compressor more. So,If any body experienced something similar to our situation, please let me know.





RE: Centrifugal compressor turbine axial displacement increase
What type of coupling is between ST and compressor? Does the compressor have its own thrust?
I would think that the coupling should allow for axial growth of the two elements. for example if the coupling is a gear/spline type, there should have gear lenght to allow the two elements to float. The flexiable plate type couplings should have cold preloading axially that when elements grow, will reach a nuetral position.
I have seen these couplings misassembled and apply addition thrust loading (and reverse thrusting situations)
Does your maintance records include the element's thrust "bump" dimension and an external position referance. A planned shutdown and checking the ST's thrust bump sounds warrented if instrumentation show excessive wear.
It may be that thrust bump is ok and instrumentation is vibrating out of adjustment
RE: Centrifugal compressor turbine axial displacement increase
Regards
Dave
RE: Centrifugal compressor turbine axial displacement increase
saludos.
a.
RE: Centrifugal compressor turbine axial displacement increase
RE: Centrifugal compressor turbine axial displacement increase