Monday, March 28, 2011
Saturday, March 19, 2011
DEH Pump
(3/8/11)
* unable to built up pressure during pump change over
* status after trial with coordinating electrical,mechanical and instrument team
- running pump 2A current 4.4 amp, pressure 38.30 kg/cm2, vibration normal,no sound
- pump 2B started at 09:41, current 4.3 amp, during both pump running pressure gradually increased up to 39.13 kg/cm2, vibration normal, no sound
- after taking trial for 10 minutes pump 2B stop at 09:51, pressured drop up to 37.25 Kg/cm2 (which is normal).
(DEH pump checking 7/3/11)
 |
| pump checking with open the venting plug and rotate manual the motor by hand, oil coming out normal |
 |
| take out the motor and checking condition of coupling, teeth of coupling & teflon still in good condition |
 |
| lift / take out the pump check all condition of connection and bolt also suction filter pump, all in good |
* after all checking than reassembly and trial, pressure ok, keep in stand by, with running pump 2A
* instrument replace pressure indicator with new one
MTC advice after checking:
" we suggest to electrical for tightening connection cable to the motor better use proper tools not tighten the nut with plier "
Tuesday, March 15, 2011
Condenser & Turbine Extractions
Introduction
What is condensation
* process of conversion from vapour to liquid
Vacuum
* vacuum is sub-atmospheric pressure, measured as the pressure depression below atmospheric
* vacuum is created in a closed chamber of the gas or vapour whose molecules are responsible for the internal fluid pressure, is partially withdrawn
* one Kg of water vapour at 0.1 bar occupies 14.695 cubicmt whereas after condensation it will occupy only 0.0010102 cubicmt of liquid
How is vacuum created
* the liquidating of most the vapour molecules creates region of emptiness thus creating vacuum
What is condenser
* heat exchanger, to condense steam from the exhaust of the turbine to water
Where is it located
* at the exhaust of turbine
Why is it required
* to receive large volumes of steam exhausted from steam prime mover (turbine)
Low Pressure Heater - 2
What is condensation
* process of conversion from vapour to liquid
Vacuum
* vacuum is sub-atmospheric pressure, measured as the pressure depression below atmospheric
* vacuum is created in a closed chamber of the gas or vapour whose molecules are responsible for the internal fluid pressure, is partially withdrawn
* one Kg of water vapour at 0.1 bar occupies 14.695 cubicmt whereas after condensation it will occupy only 0.0010102 cubicmt of liquid
How is vacuum created
* the liquidating of most the vapour molecules creates region of emptiness thus creating vacuum
What is condenser
* heat exchanger, to condense steam from the exhaust of the turbine to water
Where is it located
* at the exhaust of turbine
Why is it required
* to receive large volumes of steam exhausted from steam prime mover (turbine)
* to condense large volumes of steam to water which may be used again in boiler
* to maintain pressure below atmisphere to increase work output from the prime mover (turbine)€
Type of condenser
* surface condensers
* jet condensers
Condenser specification
* manufacturer GEC
* steam flow 50.84 Kg/s
* vacuum 115 mbar
* surface area 3459.8 SqM
* outside dia of tubes 19.05 mm
* tube wall thickness 1.016 mm
* number of tubes 6322
* tube materials admirality mixture brass
* cooling water i/l temp 34 DegC
* cooling water o/l temp 43.38 DegC
* cooling water quantity 10231.2 tph
* tube plate material carbon steel
* number of passes 1
* cooling water temp rise 9.38 DegC
Low Pressure Heater - 1
* surface area 130.81 sq.m
* no of tubes 210
* tube material stainles steel
* shell material carbon steel
* water quantity 61.09 Kg/s
* head loss 4.64 m
* steam quantity 3.773 Kg/s
Low Pressure Heater - 2
* surface area 130.81 sq.m
* no of tubes 210
* tube material stainles steel
* shell material carbon steel
* water quantity 61.09 Kg/s
* head loss 4.64 m
* steam quantity 4.33 Kg/s
Deaerator
* tank storage capacity 49.59 cu.m
* feed inlet quantity 61.09 Kg/s
* temperature 114.6 DegC
* heater drain quantity 12.40 Kg/s
* heater drain temp 202.4 DegC
* bled steam quantity 3.794 Kg/s
* bled steam temp 189 DegC
* feed water outlet quantity 77.28 Kg/s
* feed water temp 155.6 DegC
High Pressure Heater - 4
* surface area 264.2 sq.m
* desuperheating 35.39 sq.m
* no of tubes 372
* tube & shell materaial carboon steel
* water quantity 77.28 Kg/s
* water velocity 1.427 m/s* head loss 1.74 m
* feed water inlet temp 157.6 deg C
* feed water outlet temp 200.7 deg C
* steam quantity 6.33 Kg/s
* steam temp 296.6 deg C
* steam pressure 15.88 bar
High Pressure Heater - 5
* surface area 264.2 sq.m
* desuperheating 53.18 sq.m
* no of tubes 372
* tube & shell materaial carboon steel
* water quantity 77.28 Kg/s
* water velocity 1.508 m/s* head loss 2 m
* feed water inlet temp 200.7 deg C
* feed water outlet temp 237.7 deg C
* steam quantity 6.07 Kg/s
* steam temp 380.1 deg C
* steam pressure 31.18 bar prepared by Girish R
Saturday, March 12, 2011
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