Installation procedure of BWCP or CC
PUMP.
Generally this pump is getting
erected under the supervision of
supplier’ s representatives. However all the necessary inputs and
environment to be provided by the client
or customer. However a standard check list is given below for understanding.
Ensure pump was stored and rotated per manufacturer’s recommendations. If it is a long storage then this
should be stored vertically as actual position.
Insulation resistance is measured
periodically by HT insulation testing machine.
All connecting pipe are attached with
proper cleaning. Any particle present may stall and damage the pump. One should
be very particular about flushing and cleaning of the pipes.
Check the impeller wear ring
clearance diameter.
Check all the piping supports showing
the drawing are erected ,set as per drawing.
Check all the PWHT and NDE data
before commissioning.
Check the alignment data of mating flange pre welding and post
welding. The flange should be perfectly horizontal with known tolerances.
Check that motor orientation is as
per drawing and Gasket are fitted as per drawing .
Compression of gasket is also an
important data. Studs are fitted with anti seize compound ( as recommended by
supplier).
Stud compression is to be done as per
manufactures recommendation i.e sequence and value.
Assure that the heat exchanger is completely
flushed with warm water.
Connect heat exchanger and associated
piping to circulation pump motor.
Assure welding/NDE has been completed
per applicable code/contract requirements.
Install gauges and recorder for
temperature and pressure.
Install temporary strainer in
exchanger low-pressure system.
Assure that motor and heat exchanger
are filled with inhibitor, treated water or condensate.
High Pressure water connection are
taken from BFP discharge and condensate Pump discharge. Emergency water
connection is taken from a small tank installed at height ( for our unit it is
77 metre). All lines connected to this and BWCP to completed and flushed and
made ready for commissioning. This is emergency supply when there is total
failure of power in the system.
Individual hoist are supplied with
individual pump to facilitate module insertion. It is highly recommended to
commission this facility before BWCP erection. As the pump is vertical and gap
is very low one should take extra
precaution to erect it. On that time this facility will help to insert the
module very slowly and in vertical position. Please note that the pump should be
erected around 10 meter level from ground level. Approach for the same in coal
fired boiler is a problem.
COAL FEEDER
Other important equipment is called COAL Feeder.
Coal from coal bunker ( generally it holds 8 hours coal of per mill capacity. The sizes of bunker depends on calorific value of coal and mill size) fed to coal feeder connected to each mill. The coal feeder is belt type with weighing facilities and microprocessor controlled speed of the feeder belt ,amount of coal fed into mill etc.
Each coal feeder consists of inlet shut of gate and outlet shut of gate per mill. Speed of the feeder is controlled through Combustion control philosophy.
Number of coal feeder in a 500MW or above boiler varies from six to nine depend on coal caloric value ( Indian or imported or blended).
During commissioning and operation two aspect may be noticed one No Coal alarm and coal bridge at bunker outlet ( hopper portion).
Continued to PART -I of Turbine Erection. ( TG island)
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