11-801 traning course- deaerator
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TRAINING COURSE
DEAERATOR C-EG1001
General Consideration
Operating Condition
Equipment Description
Erection
Star-Up
Maintenance
TRAINING COURSE
DEAERATOR C-EG1001
General Consideration
Deaerator is mainly used to eliminate the oxygen, carbon dioxide and other non-condensable gas fromthe water.
Operation: the water is sprayed-down inside deaeratingtower and heated by the steam flowing in upward direction. The water reaches the saturation temperature at working pressure and release the dissolved gas.
Process Design Condition 180°C
TRAINING COURSE
DEAERATOR C-EG1001
111051010Pressure (kg/cm2 g)
12012016018012580Temperature °C
500337980522001545010830260000Mass Flow Rate(kg/h)
Vent
(air + steam)
BFWBFW from
Ammonia Plant
Heating Steam
L.P
Condensate
Make-up
water
OUTLETINLET
Process Design Condition 225°C
112.5448.7Pressure (kg/cm2 g)
12012013022510080Temperature °C
500340600522001810010830260000Mass Flow Rate(kg/h)
Vent
(air + steam)
BFWBFW from
Ammonia Plant
Heating SteamL.P
Condensate
Make-up
water
OUTLETINLET
TRAINING COURSE
DEAERATOR C-EG1001
1016052200BFW from ammonia
1012510830L.P Condensate
1080260000Make-up Water
Pressure(kg/cm2 g)Temperature (°C)Flow (kg/h)
Normal Operating Condition
1016052200BFW from ammonia
1012510830L.P Condensate
1080260000Make-up Water
Pressure(kg/cm2 g)Temperature (°C)Flow (kg/h)
DEAERATOR
TRAINING COURSE
DEAERATOR C-EG1001
DEAERATOR GENERAL ARRANGMENT
-S316/316LTrays/Spay Valve
5/FV kg/cm2 g5/FV kg/cm2 gDesign Pressure
160°C350°CDesign Temperature
SA 516 Gr. 70 NSa 240 Gr. 304LShell material
Holding tankTower
NCG
Make-Up water
Stripping Steam
Start-Up heating steam Deaerated Water
Tower
Holding Tank
TRAINING COURSE
DEAERATOR C-EG1001
DEAERATOR TOWER
2940 mmCylindrical Length
2024 x 12 mmInternal Diameter
DEAERATOR DETAILS-SPRAY VALVES
TRAINING COURSE
DEAERATOR C-EG1001
3mmSpraying Nozzle size
15N°Installed
SPRAY VALVES HEADER
TRAINING COURSE
DEAERATOR C-EG1001
DEAERATOR DETAILS-HOLDING TANK
106 m3Volume
14000 mmCylindrical Length
3028 x 14 mmInternal Diameter
351 mmLow Low Level (LLL)
938 mmLow Level (LL)
2360 mmNormal Level ( NL)
2561 mmHigh Level ( HL)
OPERATING LEVEL
TRAINING COURSE
DEAERATOR C-EG1001
ERECTIONERECTION
The following prescription is intended as a general giudance for the executionof the main activities to be carried out during site erection.
NOTE: DEAERATOR IS ASME CALCULATED FOR PRESSURE AND VACUUM OPERATION,THEREFORE MODIFICATION OF ANY PART OF THE VESSELARE STRICTLY FORBIDDEN.
Check that no internals and auxiliaries have been broken during the transport or lifting.
During the erection phase, the nozzles of vessels and equipment must be protected with wooden matching flanges or plugs,to avoid any damage to the surfaces in case of accidental impacts.
The correct orientation of equipment nozzles must also be checked to ensure correct location of the equipment.
Supports shall be checked.
TRAINING COURSE
DEAERATOR C-EG1001
The following main erection phases shall be considered:
Positioning of holding tank, tightening the fixed saddle
Positioning of deaerating tower and connecting downcomer and internal steam balance nozzle, tightening the relevant bolts;
Tightening of tower supporting saddles;
Installation of platform and ladders;
Positioning of piping, supports and other equipment;
Installation of electrical/instruments;
Installation of deaerating tower internal parts
NOTE: INTERNAL PARTS TO BE INSTALLED AFTER FLUSHING
TRAINING COURSE
DEAERATOR C-EG1001
TRAYS INSTALLATION (1)
Tray modules shall be carefully handled for introduction and assembling to avoidany damage.
The tray modules introduction shall be done through the manhole which is on the external deaerator head.
Before introduction check that tray modules and fixing accessories are clean. If necessary wash (with soft water) and dry them.
Check that the tray support frames inside the tower are perfectly horizontal and free from any obstructing matters. Put crosswise over them adequate walking wooden planks.
Introduce each tray module and pile them inside the deaerator as per IOM.Remove step by step the walking wooden planks.
Once the last modules have been fitted, it will be advisable to tighten definitively the bolts of the fixing packaging modules accessories gettingin and moving on the package only after having placed suitablewooden boards in order to prevent damaging and deformation of the modules.
TRAINING COURSE
DEAERATOR C-EG1001
SPRAY VALVES INSTALLATION
Valves are delivered already properly fixed and no controls are recommended
TRAINING COURSE
DEAERATOR C-EG1001
START-UP AND OPERATIONNormal procedure to be followed
Check that level indicator valves are open if any.
Release condensate water, slowly in the holding tank increasing flow up to the design level.
Release start up steam slowly in the holding tank until the deaerator temperaturereaches the required value.
Release steam into the deaerating tower.
Release condensate water into the deaerating tower, increasing flow up to the design conditions.
Check that steam reaches and maintains the foreseen pressure value.
Should some bangs been heard, reduce water flow rate.
Shut down
TRAINING COURSE
DEAERATOR C-EG1001
WHEN THE DEAERATOR MUSTS BE PUT OUT OFCOMMISSIONG, THE DUTY HAS TO BE REDUCED GRADUALLY, IN ORDER TO AVOID WATER HAMMERING.
Fault finding
TRAINING COURSE
DEAERATOR C-EG1001
Make sure that the regulation of the condensate flow is smooth and thatstorage tank volume can meet the possible fluctuations; sudden changes in working conditions may cause an insufficient venting.
Working fluctuationsG
Make sure that vent pipes both inside and outside the degassing tower are not obstructed.
An insufficient venting may cause the retention of non condensable gasses
F
Check that seats are clean not encrusted or worn out.Make sure that the valve stem slides free inside the shutterMake sure that the inside distribution valves have no obstructive matters, ags,etc.Check the springs tension and release the relevant bolts, if necessary.
The inlet water through the spray valves is insufficient
E
Check the control system of the relevant valve, comparing its pressure with theone given on the tower pressure gauge.Make sure that the steam regulation valve does never open completely; if this occurs, may be that steam sometimes is insufficient.
Inlet steam pressure below design data
D
Check the temperature of condensate at a point very next to the deaerator and make the necessary adjustments to the up-stream equipment.
Temperature below/above design data
C
Check the control system of relevant valve.Synchronize working time with the steam regulation valve.Make sure that no obstructive matters or scale prevent the normal working.
Inlet water flow-rate higherthan design data
B
Perform an additional measurement.Check that no air leakage is present before sampling point (to be evaluated andchecked in their correctness).
Excess of oxygen content (or improper sample Collecting)
A
TRAINING COURSE
DEAERATOR C-EG1001
MAINTENANCEREGULAR AND PREVENTIVE MAINTENANCE
Regular and preventive maintenance is the periodic check of the equipment working conditions during normal operation and the removal of defects and inconsistencies observed during equipment operation.
Checking vibrations of machinery, temperature/pressure of equipment, etc.
Providing maintenance recommended by instruments manufacturers
Replacing or cleaning spray valves and similar equipment
Checking correct operation and readings of instruments
Replacing gaskets
Eliminating leaks
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