There are many types of electrostatic precipitators but I will describe only
BHEL make ESP.
- ERECTION PLAN AND SEQUENCE.
- Check the foundation of ESP column .
- Mark the centre line .
- Check the distance between centre lines of ESP foundations.
Tolerance +/- 10mm.
-Top elevation of ESP foundations to be measured.
- Spacing between its foundation and diagonal difference.
- Bolt to Bolt pitches distance and diagonal distance to be measured
Tolerances for pitch +/-03mm and diagonal +/- 05 mm.
- Some of the foundation will have shear lugs also .All those measurement
are to be taken.
Top of the elevation and dimension of shear lug pocket is very important
for carrying out the secondary grouting by Ready Mix concrete like
conbextra , pagel , sikka , five star etc. Gap between foundation and column
pedestal will determine the volume of RMC required. Generally GAP is
restricted to 30 mm to maximum 70 mm. Secondary grout can be done
by one grade higher concrete but the curing time and settling time will be
21 days where as the same value can be achieved within 3 days of RMC
concreting. Cost of RMC is much more therefore optimum dimension should
be achieved during pre-concreting check of foundations.
Once all foundations are checked then we can start preparing for column
erection. For any 500MW ,600 MW or 660MW set either there will be
04 pass ESP or 06 pass ESP. The work involved in each pass will be the
same and repetitive. Erection should start from the centre pass of the ESP
then move out to outer side. This help us in optimisation of crane capacity
any deviation from this may attract the requirement of higher capacity crane
for erection of wall , inlet nozzle , roof truss etc. Interface with boiler erection
CHP , AHP and Duct structure will obstruct ESP erection. Therefore careful
planning is required to erect ESP .
- Sweep and camber of the columns to be checked .
- After erection column to be vertical. Tolerance 1mm/M ,max 10 mm.
- Horizontal bracing and diagonal bracing to be erected.
- Checking of orientation of column is must before erection.
we donot erect all the digonal bracing to allow movement of Hydra crane
between the columns . Otherwise same is not possible . Bracing are erected
when our requiremnent of Hydra crane reduces.
- After welding of all bracings etc bearing /slide supports are placed on the
top of the column.Diagonal Distance are measured from the top of the fixed
foot column to other bearing top and recorded.
contd to part-3
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
BHEL make ESP.
- ERECTION PLAN AND SEQUENCE.
- Check the foundation of ESP column .
- Mark the centre line .
- Check the distance between centre lines of ESP foundations.
Tolerance +/- 10mm.
-Top elevation of ESP foundations to be measured.
- Spacing between its foundation and diagonal difference.
- Bolt to Bolt pitches distance and diagonal distance to be measured
Tolerances for pitch +/-03mm and diagonal +/- 05 mm.
- Some of the foundation will have shear lugs also .All those measurement
are to be taken.
Top of the elevation and dimension of shear lug pocket is very important
for carrying out the secondary grouting by Ready Mix concrete like
conbextra , pagel , sikka , five star etc. Gap between foundation and column
pedestal will determine the volume of RMC required. Generally GAP is
restricted to 30 mm to maximum 70 mm. Secondary grout can be done
by one grade higher concrete but the curing time and settling time will be
21 days where as the same value can be achieved within 3 days of RMC
concreting. Cost of RMC is much more therefore optimum dimension should
be achieved during pre-concreting check of foundations.
Once all foundations are checked then we can start preparing for column
erection. For any 500MW ,600 MW or 660MW set either there will be
04 pass ESP or 06 pass ESP. The work involved in each pass will be the
same and repetitive. Erection should start from the centre pass of the ESP
then move out to outer side. This help us in optimisation of crane capacity
any deviation from this may attract the requirement of higher capacity crane
for erection of wall , inlet nozzle , roof truss etc. Interface with boiler erection
CHP , AHP and Duct structure will obstruct ESP erection. Therefore careful
planning is required to erect ESP .
- Sweep and camber of the columns to be checked .
- After erection column to be vertical. Tolerance 1mm/M ,max 10 mm.
- Horizontal bracing and diagonal bracing to be erected.
- Checking of orientation of column is must before erection.
we donot erect all the digonal bracing to allow movement of Hydra crane
between the columns . Otherwise same is not possible . Bracing are erected
when our requiremnent of Hydra crane reduces.
- After welding of all bracings etc bearing /slide supports are placed on the
top of the column.Diagonal Distance are measured from the top of the fixed
foot column to other bearing top and recorded.
contd to part-3
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
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