CONDENSER - AUXILIARIES OF STG SETS PART II-ABC OF THERMAL POWER PLANT

Depending on site conditions, the preassembly of the plate will be done.If the foundation and 

approach is ready then it would be directly assembled on the foundation. However, if the foundations 

are not ready it would be assembled separately outside. The bottom plateis in four parts and two of them will be pre-assembled outside. On each half the hot well and the spring supports will be welded/tacked. As the opening on the foundation is big enough the preassembled bottom plate can be lowered flat without any risk  by EOT crane .However fixing of lug plate for mounting D-Shakle should be carefully done considering the weight of the plates and accessories.

 Both sidewalls are carrying in four parts. Two joints would be welded outside the foundation.

Each dome wall, both upper and lower is in two parts. These would be assembled together before erection.

DOME SHIFTING STRUCTURE

The central portion of the structure shall be assembled outside.

 CLEANING OF COMPONENTS

 The cleaning of components shall be done either by sand blasting using low-pressure air (2.5 kg) or by alkali and hot water.

 TUBING  

The tubing of the condenser shall be carried out from the end of the condenser. The opening in “A” 

row    in front   of the condenser is not to be closed till tubing is complete. Tubes shall be transported 

on a long bed trailer so that the overhang is not more than 1.5mm either side. In case a small crane 

and space is available the tube boxes shall be unloaded near “A” row columns. However, in normal 

cases the boxes shall be unloaded inside the TG hall by EOT crane and shifted   to position   

manually. However when site is  ready with A_row civil work then tubing should be done from A –Row side. The Platform for tubing to be made flexible and can be  lifted time to time after completion of certain height of tubing. Therefore total platform should be held by eight  chain pulley block with adequate capacity. Rough  weight calculation to be done before finalising the pulley block. At present all vendors brought specialised gang to do this job therefore time is considerably reduced .  

 WATER BOX HANDLING DEVICE

This would be erected when the welding of internals is in the progress.  In case this is not available it would be better to have suitable openings   on TG Floor and oil canal from where the slings can be inserted   to handle the water boxes when they are opened for tube inspection.

Check the foundation for dimensional accuracy in accordance with the plate foundation drawings. Set the support plates in mortar and align with the positions in which the spring elements will be mounted.

Tack the base plates to the spring elements. Lower hot well below and place it on the ground. Lower 

the sections making up the bottom plate onto the support plates of the condenser foundation.  

Assemble and align the sections which have been lowered onto the foundation.  Weld bottom plate 

as per sequence. Lift hot well and weld with bottom plate. Align the bottom plate to the turbine axis 

in zero elevation. Raise bottom plate in axial direction and into zero elevation, taking care that when 

condenser is finally tilted, its center line would match with turbine axis.  When the bottom plate is at 

zero elevation, shim assembly of the water boxes and condenser shell internals, the support bolts of 

all the spring elements must be in their uppermost positions before the work is commenced.    Detach 

the tack welded base plates from the spring elements and eliminate the weld spotsplates under all 

spring elements.  In order to avoid displacement of the bottom plate during  assembly of the water 

boxes and condenser shell internals, the support bolts of all the spring elements must be in their 

uppermost positions before the work is commenced.    Detach the tack welded base plates from the 

spring elements and eliminate the weld spots.

Typical pre-assembly bay of condensed on urbine floor. Very first work done which is not listed in

OEM manual is jointing of stiffenr rod of condenser. Please note tonnes of welding rod is necessarry

to complete the job which is time consuming and labour oriented. Some of the TSP are lying for 

cleaning and checking.

An opening of LP turbine is visible when A Row civil work is not ready but EOT crane is ready then

hotwell , bottom  plate and other material goes through this route. It is experienced that the area 

between paddle flange and condenser foundation takes considerable time to complete because of 

water accumulation..

continued to part-iii.


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