PRESSURE PART ERECTION OF BOILER IN A THEMAL POWER PLANT.

We have completed the discussion about structural erection of Boiler  in brief. Please note

erection strategy  to finalised before starting of erection. This will give control over cost

and time. Interface with civil work will be there but it should minimum . The whole planning

should be discussed amongst the team for setting priority. Structural member where ever

possible should be pre-assembled on ground . This will help us to reduce number   of lift to

performed. It is  sign of Good erection if we complete all the platform work including

hand railing. Once we complete the structural erection of roof and aligned the girder , WB

and rolled beam etc .then we are ready for Pressure Part erection. Before we discuss about

the erection sequence a brief description of Pressure Parts for a 660 MW boiler with MNC

design ( as Indian manufacturer does not have the technology) is given below. It has been

seen that for Pressure Parts the weight of  component of Indo-American company and the 

Chinese company is more or less same . However  one can compare the same system wise

a conclusion can be drawn.

Before we start explaining let us add some photos to understand how pressure parts look like.

The above picture shows that pressure parts components are hanged by suspension rod from

rolled beam of roof structure. 

The above picture shows the erection of separator and collector vessel and their interconnection

piping. In super critical boiler there is no drum instead we have separator vessel.

DETAILED DESCRIPTION OF PRESSURE PARTS

PPA ( Pressure Parts arrangements)

The pressure part system of once through units consist of the following.

a. Economiser System

b. Furnace System.

c. Start up system ( new and different from sub critical unit)

d. Super heater System.

e. Re heater System.

A.  Economiser System

The economiser is plain tube inland type and made of carbon steel tubing. The numbers of 

elements are 04 nos in the project we have worked for. There are two banks of economiser.

The coils are supported by hanger tubes  The economiser inlet headers and outlet headers

are positioned inside the flue gas path.

(to be continued)