Cold-state alignment diagram for compressor and turbine

When aligning the rotor, what is adjusted are the foot bolts of the cylinder block or their shims; however, the rotor is placed on the center line of the bearing pockets in the cylinder block. . . . . . . . . .

It is recommended to read relevant books first, and then ask questions specifically

OP, both the rotor and the cylinder block should be tilted! ! ! !

You should make sure that, after completing the cold alignment, when the machine is in operation and at operating temperature, the rotors of all cylinders are aligned on one line. In fact, you can think of it this way: theoretically, the rotors and the midplane are tilted, but this tilt is relatively small and does not affect the operation of the unit, as the machine has already been adjusted to within acceptable levels of levelness when you first adjusted its levelness. Don’t keep worrying about whether the equipment will become uneven during operation; this can lead to unnecessary concerns. In fact, during the process of leveling the equipment, it is only adjusted to a certain range – it isn’t made completely horizontal or vertical. As long as it stays within the values specified in the technical documents, we can assume that it can operate normally

The axis of the compressor rotor coincides with the axis of the cylinder block, and the axis of the turbine rotor also coincides with the axis of the cylinder. The center line of the bearing is determined once the bearing housings are installed in the compressor and turbine factories; this center line coincides with that of the cylinder. During cold alignment, one of the turbines or compressors is first brought to a horizontal position, and alignment is adjusted with respect to this already horizontally fixed unit, so as to adjust the other unit as well.

An absolutely perfect levelness in theory cannot be achieved by any manufacturer; there is inevitably some tilt in the mid-plane of the stator, and the rotor itself is also bent. Alignment involves adjusting the levelness of the stator to an acceptable range, so as to bring the geometric centers of the stator and rotor as close together as possible, thereby minimizing the offset between their geometric center lines as well as the angular deviation. Even then, the centroid line of the rotor does not coincide with its geometric center line. Therefore, alignment does not mean striving for an exact coincidence of the geometric centers of the rotor and stator; however, this aspect is difficult to achieve perfectly, and it is ideal if the geometric center lines can be brought as close together as possible during operation.

The 5th floor has already explained it in great detail~~~ I’ve learned something new; those tiny angles can also be considered horizontal. As long as the deviation doesn’t exceed the specified values, it’s fine

There is no absolute alignment for machine alignment; only relative alignment exists. When using graphical methods, it is necessary to know the amount of expansion and contraction of the front and rear feet, and then draw the diagrams using the inverse ratio method, as errors are inevitable. For the calculation method, you need to know the length from the foot to the coupling, and there is also error involved

Not thorough enough! ! ! I hope all of you will give me your strong support! ! ! :lol

What’s not thorough enough? It’s just a straight line between two points, right?