SCHEME OF DEAERATOR WITH CONNECTIONS

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TABLE OF CONTENT

1:- Deaerator an introduction
2:- Deaerator connections
3:- Deaerator schemes

DEAERATOR AN INTRODUCTION
1. Highest vessel in the system.
2. Remove dissolved gases.
3. Used for heating of feed water. 
4. Reduce the amount of steam in the system and hence energy flow to the plant.
5. Extraction steam enters from the bottom of the tanks.
6. Steam passes over the water droplets.
7. As the extraction steam condensed the water droplets releases the non-condensable gases vented to the atmosphere.
8. The deaerated feed water & condensed steam mixed and drained out to the FST.
9. FST supply feed water to the boiler feed pumps.
10. Acted as a open type feed water heater.

CONNECTION
1:-One pipe line coming from CEP discharge via through ejectors, GSC D/R coolers LPH-1, 2, 3 which supply the water to the Deaerator.
2:-Two pipe lines are connected to the Deaerator which are coming from HPH-5 & HPH -6 drips.
3:-Two vent pipe lines are connected to the Deaerator tank coming from HPH-5 & HPH-6 shell vents. (Since they have high pressure and high temperature i.e. high energy vent so it is supplied to the Deaerator, for saving of DM water and utilization of its energy).
4:- Three lines (in various plant one line) for the boiler feed pump suction for supplying water to BFP (TDBFP  & MDBFP).
5:- Three lines are connected to the FST which recirculate the water which tapped from discharge line of boiler feed water pump (for maintaining minimum flow for BFP),(TDBFP  & MDBFP).
6:- One Deaerator drain line connected which further goes to the unit flash tank and goes to drain            out.
7:- One deaerator over flow line which goes  the LPDFT tank (excess water over flow through this line and goes to hot well).
8:- On deaerator sampling line which is used for sampling of water.
9:-   A initial heating line to the FST water from the steam taken from LT PRDS.*
10:- Deaerator extraction line coming through the extraction of IPT (this steam is used as deaerating steam). 
11:- A line  from CRH supply the steam for Deaerating.*
(* all these three lines are connected through a common header  and then goes to the deaerator but from HTPRDS  before supply valve a lines is tapped for initial heating            of water in to the FST).
12:- A line for initial filling is connected to FST for initial filling of FST (it save the energy if filled by CEP).
13:- A manhole is provided for overhauling and maintenance work in both Deaerator & FST.
14:-Two stand pipes are connected for installements of level transmitters and local gauge glass ( for measuring of level of deaerator ).
15:-Also some instruments are instealled for temperature, pressure measurement of system.

SCHEME OF DEAERATOR WITH CONNECTIONS



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