OPERATOR 2 2 Flashcards
(29 cards)
If conductivity or silica in the HP drum reaches and exceeds a high limit what would be the corrective action taken.
shutdown the unit
If conductivity or silica in the HP drum reaches and exceeds a high limit what would be the corrective action taken.
increase the blowdown
On the exhaust plenum of the gas turbines how many exhaust thermocouples are there?
27
What chemicals are used in the ro system and why
aNTI-SCALENT- PREVENT CORROSION
sodium bisulfite- eliminate any chlorine
caustic-increase ph
What does steam temperature matching mean on GTs?
Using the Gas Turbine hot exhaust gases to control the steam temperature going to the steam turbine.
What is considered a cold start on the steam turbine?
The HP turbine 1st stage bowl and Reheat Bowl temp is < 400 degrees Fahrenheit
What is the function of phosphate?
Phosphate is added to the feedwater to combine with any calcium or magnesium to form a soft fluid sludge, which can easily be removed by blowdown
What is the function of the CBV’s “Compressor Bleed Valves” on the Gas Turbine
Fully open at start up, the valves reduce the air flow on compressor stages downstream of the 9th & 13th stage air extraction points. This reduces starting torque and provides pulsation protection and smooth loading of the compressor as turbine RPMs rise
What is the function of the IGV “Inlet Guide Vanes” on the Gas Turbine.
regulate how mcuh is air is coming into the gt.
What is the function of the Inlet Bleed Heat Valve on the Gas Turbine.*
heat the incoming air
What is the function of the PM valves “Premix Valves” on the Gas Turbine.
mix the air and fuel
What is the most important factor to consider when making the decision on when to roll the ST.
To ensure that the steam supplied is at the proper pressure and temperature and that all steam lines have all residual condensation removed.
What is the normal operating pressure of Seal oil at the turbine end seal?
6-8psi
What is the purpose of arming the bypasses on the steam bypasses?
What is the purpose of Water Washing the Compressor on a Gas Turbine.
Loss of performance during operation as result of deposits of contaminants on internal components. This loss is indicated by a decrease in power output and an increase in heat rate. The deposits of atmospheric contaminants on the blades are removed by was
What is the temperature of the Fuel Gas on the outlet side of the performance heater?
340
What is the tolerance for Steam Seal Header Pressure in normal operation?*
1.5-3.4psi
What two different things could a bypass around the CTG Seal Oil Regulator be used for?
realignment or if regulator fails.
When do the HRH and HP bypass valves go into Cascade control?
At IPC (Inlet Pressure Control) is when HP bypass will go to Cascade, Forward flow is when the HRH Bypass go to cascade
Why is it extremely important to maintain proper water level in a steam drum.
high level could carryover into the steam flow to the turbine, low drum level could cavitation the BFP and burnup the boiler tubes
Why is seal oil DP so important?
if the seal oil pressure isn’t higher than the H2 pressure the H2 could escape the generator or air could enter the generator reducing purity and causing a potentially explosive mixture of H2 and air
Explain the difference between a storm water drain and process drain.
PROCESS WATER HAS TO BE FILTERED WHILE STORM DRAIN CAN BE IMMADILY HARDER.
Explain the duties of the authorized Entrant in a confined space.
Trained and Authorized to enter Confined Space, performs work, understands use and limitations of equipment, can identify hazards of the space, exits the space if needed.
Explain when you would be required to use fall protection.
WORKING OVER 4 FEET.
