IP rotor blades removal - 150 MW turbine

The scope of works for IP rotors includes the exchange of the blades. To do it, firstly the existing blades have to be disassembled. I would like to show a blades dissasembly process.

The blades are put in on the rotor discs through a special prepared place. This "entry" is invisible before, but the dissasembly process starts exactly in this place.

The pictures shows a blades locking set . The locking inserts are marked, beetween them there are seven blades. The blade in the middle, marked with black dot is the locking blade.

We have to put out the locking blade and then the rest is quite simple.

The very first step is to get rid off the shrouds. As the new blades with the additional hardware will be installed, there is on needs to be gentle - a hand grinder is used.

We have to reach the two locking inserts, that is why the locking blades and couples adjacent ones are cut off.

Just now there is convinient acces to the locking inserts, which are disassembled.

Each locking insert consists of three parts.

The pictures presents the locking insert, which we managed to put out with minimum damages.

The middle parts of the insert can be removed as a one piece but it is very hard to do and consumes a lot of time, so we safed only a very few samples and a rest were destroied during the removal works.

We make a hole in middle parts of the insert, so this was changed into chips. Below the insert is visible after the blade cut off.
The insert boring:

150 MW turbines - continuation

Happy New Year to everyone who visits my blog ... .

I would like to specify what is the scope of work for the rotors, I mentioned in my previous post.
I think, that is a first approach and will be updated after fact finding activity we are doing since the middle of December , so here we have:

1. The HP rotors.
- blasting,
- NDT examination,
- measurement of the rotor's geometry,
- seal strips exchange,
- machining of a bearing journals, seal strips,

This is what I know for today but once any damages are revealed during NDT, the scope of work will be increased, certainly customer has to accept our proposals.

2. The IP rotors.
- blasting,
- NDT examination,
- measurement of the rotor's geometry,
- seal strips exchange,
- machining of a bearing journals, seal strips,
- all stages reblading

Similar remarks like above it had been defined before casings opening, so if customer agrees to accept an additional, necessary works, we will do it.

3. The LP rotors.
- blasting,
- NDT examination,
- measurement of the rotor's geometry,
- seal strips exchange,
- machining of a bearing journals, seal strips,
- reblading of L0 and L1 stages