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Wednesday, 2 April 2014

ERECTION OF TURBINE GENERATOR PKG PART-V, PEDESTAL, BASE PLATE ERECTION, INSTRUMENTS - ABC OF THERMAL POWER PLANT.


Part –V

PLACEMENT OF LP BASE PLATE,

Clean all the four base plates.

Mark/punch centre line on the base plate as per drawing.

Ensure proper cleaning of base plate on bottom side.

Put identification marks on each base plate to avoid any mistake in positioning of the same.

Do colour matching of all the eight nos. carrier plate on both the faces.

Match LP base plate with the individual carrier plate.

Place all the four base plates in position along with their levelling screws and foundation bolts.

Provisionally align and level all the four base plates.

Assemble protection sheet in the foundation bolt holes.

ALIGNMENT OF PEDESTALS AND LP BASE PLATES


Provisionally align and level all the four pedestals including LP base plates with reference to the earlier marked longitudinal and transverse axis. The elevation reference is to be taken from the already positioned plate for this purpose.
Align and level LP rear pedestal and set the elevation as per machine centre line.

Use piano wire arrangement with micro- meter for centering of pedestal bore and use water level jar for setting of elevation or use any other instruments like dumpy level /total station etc. . Use measuring tape to maintain pitching of the bearing from one pedestal to another. Pedestals are to be set in level condition on both longitudinal and transverse direction. Align and level HP front, HP rear and LP front pedestals. Elevation of the pedestals are to be set as per catenary of the machine considering the half bore error of the pedestal if any.
Align and level, LP base plates. Elevation of LP base plate is to be kept higher than the rear pair of LP base plate in line with catenary of rotor.
After alignment of LP rear pedestal weld the locating rings as mentioned in the drawing.
During welding of locating ring, ensure that there is no movement in the pedestal in any of the direction.
Some of the precision tools used during the erection of steam turbine or any rotating machines is given below. These tools are readily available in India. All the tool manufacturer is having their sales office in India .











Continued to PART-VI

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3 comments:

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