GE gas turbines

IS this a military engine? Or an engine with a military equivalent. The military makes maintenance manuals that are available for sale online sometimes.

It is difficult since no OEMs will give you (incl me). These are company classified materials. When a part is supplied to the customers, it is only a tiny part (sorry but it is what it is)

It is expected that a component like GT is repaired by authorised repair plant under supervision of OEM or by OEM itself

And how it is expected to be answered actally ? how much repair is done ? in A GT that we manufactured (long back) the internal protocol was approximately 300-400 pages (including check points of course) in which the flange to flange asly itself might have been about 200 pages.

If you have gone for minor repair, check only what is repaired and cross your fingers. If it is done by OEM, it is his guarantee and responsibility and no OEM worth his will give any thing sub-standard to you.

I as an ex Q man (now no more in the said industry and/or deptt ) can say that the things that customers can not or could not find were identified by us and rectified (of course we have allowed him to be satisfied and sign the dotted lines) and till it is pointed out they can not find out (a few times not even then)

For you it is one off Gt for us it is the experience of 100s of them.

these information not supposed to be secret of the manufacturer. what i know is that the owner or the user of the equipment should have a qualified team or department for these quality inspections.

i am talking about gas turbine parts which are reconditioned by the OEM or any other vendor. as a user or maintenance man we cannot gurantee the quality of repair by the OEM.

Memory tells me that these Frame 5 gas turbines were in the order of 20 to 25 MWatts with air cooled generators. The ones that I was familiar with came with very good documentation and drawings. If you do not have a good set of drawings, purchase one. These are the best source of information that the OEM (assuming you are speaking of the OEM repair shop), has or will make available to you on a routine basis. Even if it is not the OEM shop it will give you good guidance in the inspection of returned components.

You may want to re-evaluate your in house talent, a "good machinist" can be worth his weight in gold. Get your best people involved, set up your own program.

Remember that you should be in an enviable position, you are the customer, and if you are dealing with the OEM you are paying top dollar plus. That plus allows you some wiggle room when dealing with the vendor. Let the person know ahead of time that you want to know what he is doing with your equipment and how he is controlling quality. Inquire as to what special processes he is going to employ, hardness, surface finish etc. Get a commitment from him to supply you with documentation as to what the results of his work were. Then check everything you have the capability to check.

If there are obvious signs of poor workmanship such as burrs, nick's and such you should immediately make the supplier aware of the condition and demand that it be corrected.

Be careful when evaluating surface finishes, if the drawing calls for flame cutting that is what it is going to look like. On the other hand if a surface has a mirror finish it says little or nothing about the flatness and parallelism.

Final analysis there are tons of people out there that truly want your business and the OEM is aware of it.

I am sorry to disagree - For GT repair - to be of the quality that the OEM supplies (and i am proud to have been one of them) you may not get even on finger tips.

The accuracy and requirements for a 5200 RPM (may be 25MW yes but the Turbine portion generates 100MW) forget about tons i have my own doubts about number of persons that can do the nozzle harmonic check, blade tip grinding etc with-out compromising the performance, forget about the high speed dynamic balancing of rotor (or even rotor assemblies)

Pl remember a Gas turbine is not a steam turbine (for that too we at our zone have "tons of" service personnel- but their capabilities have the limitation)

Any way why to go into arguements, every body has his own limitation (and no body comes to the OEM unnecessarily if there are non OEMs equally capable available).

I am happy that you were and are an individual that took and takes pride in his work and the work of his associates. I have no doubt that you are the type of individual that is worth top dollar plus. I have also observed that you give advise freely and openly and are genuinely concerned about your fellow engineers and customers. I am certain that in your dealings with a customer you are just as open and giving as you are in this forum.

Guess what you are worth doing business with, I bet you don't have any customers addressing a forum trying to find out what you are doing to him. Or how he can check up on you.

My reference to the rating of the machine was to establish that we were not talking about an "H" style or such. Gas and steam turbines require the same exacting details and procedures. My point is you are talking about tried and true equipment, you don't have to tolerate people not treating you fairly. Also machine size is defined by the use, guess how much pressure you are going to get in a paper mill when his 500 HP line drive turbine is down.

Thanks a lot (I try my best to help others and in turn i get helped - a lot of the threads have made me brush the dust off my text books - alas >30 yrs old) but i still once in a while go to the ol'book shop and buy a one that fancies me (the current interest should i say )

My only point was that always I believe that OEMs are in market becauase they are the OEMs, And you know about R&M- it is almost in certain cases more than making the machines (I know in my current area certain machine re-conditionings takae about 5 weeks against a couple of week of a new machine) that is after the RLA is over and we know that the components to be changed (and delay in only certain case is due to inventory)

The problem happens when you open a machine (say GT) and see that a few blades are gone (not totally) but the resid life will not be adequate. Now a customer gives me a machine to make it new and not one that will run for an extended like on a Life supp system.

My companies approach will be to call the cust, explain the problem and tell him the pros and cons (not only additional cost more important the delay - I may or may not hhave the total blade set available, or prior commitment to other customers may not allow me to divert the existing inventory) allow the customer to decide.

I have not seen the same response when I have send one production machine for the R&M job - not from the OEM - but from open market (reputed firm of course) he did to the fine prints of what was ordered - no pro-active action (and within a year of that we have a break down and we are still struggling - now only we found what he has messed up and rectified - worse part is that we are not OEM for the machine so more difficult for us to find the root cause of problem)

And remember he is talking about GE who pride in their workmanship and responsibilities even their subsidiaries in other countries have the same commitment.

I was an Engineer in Rotors & Components Repair, I'm forget how many time I have did it for GE. as specially MS5001, but I'm not from the company of the OEM. For QC Inspection it was depend on the Component You check, Part Number or Drawing Number that you have. If You want to following the OEM, I think is very hard to get the information if You are not a member of GE, it was very exclussive I think. The only one of the guide line is the Drawing Number of the component. Goodluck.