What is the material for Turbine coupling bolts?
What is the material for Turbine coupling bolts?
(OP)
Last December our Refinery had a major failure on one of our turbine-generators. We want to make new coupling bolts and would like to know what material is best to use for coupling bolts. (material chemical composition)
Turbine and generator are solid coupled.
Can any one assist me on this?
Thanks in advance.
Turbine and generator are solid coupled.
Can any one assist me on this?
Thanks in advance.





RE: What is the material for Turbine coupling bolts?
RE: What is the material for Turbine coupling bolts?
What failed?
What was the mode of failure?
What is the power of the turbine?
What is the type and size of the coupling?
This and any other information you have will help you get sound advice and hopefully the proper direction.
RE: What is the material for Turbine coupling bolts?
bolts supplied. It may indicate the
strength of fastener needed.
RE: What is the material for Turbine coupling bolts?
It is also a Solid coupled arrangement meaning no coupling between "hubs".
The vibration levels on the BN panel were jumping out of proportion before tripping the machine.
Because of this extensive failure we don't want to use the same bolts.
Thanks,
Jp
RE: What is the material for Turbine coupling bolts?
- material chemical composition
- macro hardness to establish approximate strength level
- microstructure evaluation to establish heat treatment of the coupling bolts
Make sure that you receive all material test reports and nondestructive testing reports for the reverse engineered coupling bolts.
If the coupling bolts cased the failure, you need to investigate the root cause.
RE: What is the material for Turbine coupling bolts?
Being a solid coupling were the bolts fitted or have an interference fit?
If either of the above make sure you check the coupling bolt holes.
Have the coupling bolts ever been changed out?
What axis/direction was your first indication of high vibrations?
Expedite the metallurgical evaluation of the shaft fracture.
RE: What is the material for Turbine coupling bolts?
Unclsyd would you know what the clearances should be on a solid coupling? How many thousands?
We made every provision with broken shaft (sent to metallurgical lab)
RE: What is the material for Turbine coupling bolts?
Without a lot more information it would be impossible to give any specific information.
The information should be in the operating manual or you should be able to contact the manufacturer or his represenetive. The name of the manufacturer should be on the coupling or in the operating literature.
Come back with the specific clearances you are concerned with.
RE: What is the material for Turbine coupling bolts?
I think the best advice you've recieved so far is to ask the manufacturer and use what he supplies. anything else and you'll regret it proabably.
RE: What is the material for Turbine coupling bolts?
I agree with many of these posts however you should approach this event as carefully and as scientifically as possible to find the correct "Root Cause" of this costly failure in order not to "reverse engineer" the same event at a future date. Coupling bolt design is based on many factors including type of coupling, fit tolerances, alignment toleances, fastener style, (taper sleeve, hammer tight, etc) bolting material characteristics, applied torque, inertia, thread type, operating enviroment etc.
Before attempting to have a third party "reverse engineer" anything I would gather as much information as possible and find the failure mode and root cause of the failure before moving forward.
Regards
Romefu12