15-DLN1 Rev.1.0 April2001 (Dry Low NOx 1 System Operation)

e

Dry Low NOx I System Operation Operation

GENERAL The purpose of the Dry Low NOx-1 (DLN-1) control system is to regulate the distribution of the fuel and the location of flame in the staged multi-nozzle combustors around the gas turbine. A diagram of a DLN-1 combustor is provided in Figure CPDLN-1. CPDLN-1.

Figur e CPDLN-1

GAS FUEL SYSTEM A schematic of the DLN-1 fuel delivery systems is shown in Figure CPDLN-2. The gas fuel system is made up of the gas fuel stop/ratio valve, the gas control valve, the gas splitter valve, and the gas transfer valve.

DLN1_DSC.DOC rev. 1.0 19 April, 2001 jrc

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cp d Primary Gas Purge Dual fuel only

GSV GSV Primary

SRV GCV GCV Secondary Transfer

cp d

SEC LIQUID FUEL PURGE Transfer Purge

FLOW CONTROL ORIFICE

PRIMARY LIQ FUEL X10

FROM FLOW DIVIDER

SECONDARY LIQ FUEL X10

Figur e CPDLN-2 CPDLN-2

The stop/ratio valve (SRV) is designed to maintain a predetermined pressure, P2, at the control valve inlet. The gas control valve (GCV) regulates the desired overall gas fuel flow delivered to the turbine in response to the command signal FSR from the control c ontrol panel. The total gas flow is separated into three stages by the DLN-1 system valves, the gas splitter valve (GSV) and the gas transfer valve (GTV). The DLN-1 valves control the percentage of the total fuel flow delivered to the different stages of the DLN-1 multi-nozzle combustor. The gas splitter valve (GSV) regulates the distribution of the fuel flow to the primary and secondary zones in the combustor. Refer to Figure CPDLN-1 for a diagram of the DLN-1 combustor. The gas transfer valve (GTV) divides the fuel supplied to the secondary zone between two separate flow paths in the secondary fuel nozzle. The secondary fuel nozzle assembly contains a flow radial flow passage exiting fuel out of premixing pegs, ("secondary" nozzle) and a normal diffusion type passage ("transfer" nozzle). nozzle). Refer to figure CPDLN-3.


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Seco cond nda ary Fue Fuell Nozz ozzle le Flame Fla me detector por t Secondary Se condary pegs Transrer Tra nsrer holes

CPDLN-3

LIQUID FUEL SYSTEM (If Applicable) The liquid fuel system in Figure CPDLN-2 is composed of the liquid fuel stop valve, main fuel pump, control valve, fuel filter, flow divider, and the liquid fuel secondary isolation valve. The fuel pump and control valve work in conjunction with the flow divider to supply each combustion chamber with the required fuel flow. Liquid fuel can be supplied to a set of liquid fuel nozzles in the primary zone and a nozzle in the secondary zone of the DLN-1 combustor. The liquid fuel is staged with an on/off type valve that is used to divert a fixed percentage of the total fuel flow down the secondary zone flow path. Typically, an orifice in the liquid fuel piping is sized to govern this fixed percentage split through through pressure flow division. division. Typical DLN-1 liquid fuel fuel operation requires diluent injection to meet emissions requirements.

FLAME DETECTION Reliable detection of the flame l ocation in the DLN-1 system is critical to the control of the combustion process and to the protection of the gas turbine hardware. Four flame detectors in separate combustion chambers around the gas turbine are mounted to detect primary zone flame. Also, four flame detectors in separate combustion chambers are dedicated to detect the presence of secondary flame. The signals from these flame detectors are processed in control logic and used for various control and protection functions including the DLN combustion mode determination.


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IGNITION SYSTEM Two spark plugs located in different combustion chambers are used to ignite the fuel flow in the primary zone of the combustors. These spark plugs are energized to ignite the fuel during startup and during certain DLN-1 mode changes that require re-ignition of the primary combustion zone. Flame is propagated to those combustion chambers without spark plugs through crossfire tubes that connect the primary zones of adjacent combustion chambers around the gas turbine. Flame is introduced in the secondary zone of the combustion chambers by igniting the secondary fuel flow with flame from the primary zone.

Combustion reference temperature The combustion reference temperature signal, (TT RF1), is generated by a calculation in the DLN-1 control software. This calculated temperature represents a reference for com bustor mode sequencing and fuel split scheduling, but not unit load control. control. It should be noted that TTRF1 is not a true indication of actual machine firing temperature, only a reference for DLN-1 mode transition transition sequencing. A careful checkout of the combustion reference temperature during initial commissioning is required.

DLN-1 Inlet Bleed Heat Operation of the gas turbine with reduced m inimum IGV settings can be used to extend the Premix operating region from 75%-Base load to 50%50%- Base load. Reducing the minimum IGV angle allows allows the combustor to operate at a firing temperature high enough to support premix operation. Inlet bleed heating, (IBH), through the use of recirculated compressor discharge airflow, is necessary when operating with reduced IGV angles. angles. Inlet heating protects the compressor from stall by relieving the discharge pressure and by increasing the inlet air stream temperature. The inlet bleed heat system regulates compressor discharge bleed flow through a control valve and into a manifold located in the compressor inlet air stream. The control valve varies the inlet heating air flow as a function of IGV angle. At minimum IGV angles the inlet bleed flow is controlled to a maximum of 5.0% of the total compressor discharge flow. As the IGV's are opened at higher loads, the inlet bleed flow will proportionally proportionally decrease until shut off. The IBH control valve is monitored for its its ability to track the command setpoint. setpoint. If the valve command setpoint differs from the actual valve position by a prescribed amount for a period of time, an alarm will annunciate to warn the operator. If the condition persist for an extended amount of time, the inlet bleed heat system will be tripped and the IGV's minimum reference will be raised to the default value. The IBH system monitors the temperature temperature rise in the compressor inlet airflow. This temperature rise serves as an indication of bleed flow. Failure to detect a sufficient temperature temperature rise in a set amount of time will will cause the inlet bleed heat system system to be tripped and an alarm annunciated. A diagram of inlet bleed bleed heat system system is provided in Figure CPDLN-4.


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Inlet Bleed Heat System

Compressor

Inlet Airflow

Combustion

Turbine

Exhaust Flow

VM15-1

Manual or Motor operated Isolation Valve CT-IF-1,2

VA20-1

Air Operated I/P Control Valve

VA30-1

Solenoid Drive Drain Valve Figur e CPDLN-4 CPDLN-4

GAS FUEL OPERATION

The DLN-1 fuel system operation is a fully automated, sequencing the combustion system through a number of staging modes prior to reaching full load. Figure CPDLN-5 CPDLN-5 represents typical operation operation sequence, from firing to full load fuel flow staging associated with DLN-1 operation. operation. The primary controlling parameter for fuel staging is the calculated combustion reference temperature (TTRF1), (as discussed earlier in this document). The fuel flow split between the DLN-1 combustion chamber fuel nozzles and the location of the flame is regulated as a function of TTRF1. Other DLN-1 DLN-1 operation influencing influencing parameters available available to the the operator are the selection of IGV IGV temperature control “on” or “off”, and the selection of inlet bleed heat “on” or “off”. To achieve maximum exhaust temperature as well as an expanded load range for optimal emission, IGV temperature control should be selected “ON”, and inlet bleed heat should be selected “ON”. “ON”. Temperature control and Inlet Inlet bleed heat operation operation will be discussed later in this document.


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DLN-1 TYPICAL MODE TRANSITION

START

PRIMARY MODE

LOADING SEQUENCE

LEAN LEAN MODE

EXTENDED LEAN -LEAN SELECTED “ON” (OPTIONAL SELECTION)

SECONDARY TRANSFER MODE

EXTENDED EXTENDED LEA NLEAN LEA N MODE

PREMIX TRANSFER MODE

PREMIX STEADY STATE MODE

Figur e CPDLN-5

Primary: Fuel and combustion are are only in the primary zone. The typical typical combustion reference temperature temperature TTRF1 range for this mode is from startup ignition through full speed no load to approximately 1600 F*. °

Lean-Lean: Fuel and combustion are in both the primary and secondary secondary zones. Typical combustion reference temperature for the Lean-Lean mode are between 1600 F and 1950 F*. °

°

Secondary: All fuel and combustion occur in the secondary secondary zone of the combustor. Secondary Secondary mode is a transitory mode during the transfer from Lean-Lean to the Premix mode of operation. A typical combustion reference temperature for this mode is 1900 F*. °

Premix Transfer: A transitionary transitionary mode where fuel fuel is modulated from 100% secondary to the the premix transfer destination flow split setpoint. Premix: In this mode, fuel is in both the primary and secondary zones, with with combustion only occurring occurring in the the secondary zone. Basically, air and a majority of the fuel are mixed in the primary zone and flow into the secondary zone to be burned. "Premixing" the air and fuel reduces gas turbine exhaust NOx emissions. T he typical combustion reference temperature range for this mode of operation is above 1900 F*. °

*NOTE: Refer to the Control Specifications for the correct combustion reference temperature settings for a specific turbine. Figure CPDLN-6 is a plot of the DLN-1 operational modes as a function of combustion reference temperature. During normal loading of a unit operating on gas fuel, the system will progress through Primary, Lean-Lean, Secondary and Premix modes. Normal unloading of the machine from high loads on gas fuel will go from Premix to


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Lean-Lean after the spark plugs re-ignite the primary combustion zone. Further unloading will cause Primary mode operation to be initiated which will continue through breaker opening until turbine shutdown.

Gas Fuel Splitter Valve Schedule (Loading toPremix)

100% Primary

FXSP3

FXSL

Premix % Primary

Lean-lean Loading Extended Lean-lean

0% FXKTL1

FXKTS1

FXKTL3

TTRF1

Figur e CPDLN-6

In certain operational situations, such as load rejection, the fuel gas control system may divert all fuel to the primary zones depending upon the operational mode and combustion reference temperature. The controls software generates a signal to rapidly move the GSV actuator servovalve to stroke the gas splitter valve to a 100% primary position. During the transfer from Lean-Lean to Premix, the gas transfer valve splits the gas fuel flow in the combustors' secondary stage fuel nozzle between the premixing "secondary" passage and the diffusion "transfer" passage. It is necessary to route some of the secondary fuel flow through the diffusion section of the secondary nozzle during this transfer period in order to lower combustion dynamics and stabilize the secondary flame. Figure CPDLN-7 is a typical trace of the DLN-1 valve positions during the transfer from Lean-Lean to Premix mode*. The gas transfer valve will normally be in the 0% stroke position, meaning that 100% of the secondary fuel flow will be to the secondary premixing passage in the secondary nozzle nozzle assembly. During transfer to the Secondary mode of operation, flame is extinguished in the primary zone by the gas splitter valve diverting all flow to the secondary zone. In Secondary mode, the gas transfer valve will move to an intermediate position in order to route part of the secondary duel flow through the diffusion passage.


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MS7EA MS7EA 9/25 9/25 Premi xe d Transfer Sequ ence 90 80 70 60 n e 50 p O 40 %

GSV GTV GTV

30 20 10 0 1

2

3

4

Step

MS9E MS9E' Prem ix ed Transfer Sequence 100 90 80 70 n 60 e p 50 O % 40

GSV GTV GTV

30 20 10 0 1

2

3

4

5

6

7

Step

Figur e CPDLN-7 CPDLN-7

After flame has been extinguished in the primary com bustion zone, the machine begins to transfer into the Premix mode of operation. The gas splitter valve moves to admit fuel into the primary zone and the gas transfer valve ramps to a position that will cause most of the secondary fuel flow to be routed to the transfer diffusion passage of the secondary nozzle. After the gas splitter valve has reached its steady-state Premix mode position, the gas transfer valve will ramp to its normal position, diverting all of the secondary fuel flow through the secondary passages once again. *Refer to the Control Specifications for the correct settings for a specific turbine.


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LIQUID FUEL OPERATION (If Applicable) In the DLN-1 system, liquid fuel combustion occurs in either the Primary mode or the Lean-Lean mode. Figures CPDLN-8A & B show the liquid fuel operation modes. The DLN-1 combustor is ignited during startup and operated in the Primary mode up to full speed no-load.

PRIMARY MODE c pd Primary Gas Purge Dual fuel only

GSV GSV Primary


SEC LIQUID FUEL PURGE

c pd Transfer Purge



LIQUID FUEL from flow divider


SHEAR ISOLATION VALVE Figur e CPDLN-8A CPDLN-8A


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LEAN-LEAN MODE c pd Primary Gas Purge Dual fuel only

GSV GSV Primary


SEC LIQUID FUEL PURGE

c pd Transfer Purge



LIQUID FUEL from flow divider


SHEAR ISOLATION VALVE Figur e CPDLN-8B CPDLN-8B

When the combustion reference temperature reaches a set value at some part load point, the liquid fuel secondary isolation valve, (also know as the shear isolation valve), will open and divert a fixed percentage of the total fuel flow down the liquid fuel passage in the secondary nozzle assembly. Diverting some of the total fuel flow into the secondary zone is necessary to prevent primary zone flame from impinging on and damaging the combustion liner venturi which separates the primary and secondary zones. The constant fuel flow split between the primary zone and the secondary zone continues up to the full turbine output point (base load). Normal unloading of the turbine on liquid fuel from base load progresses at a constant split between primary and secondary fuel flow until a combustion reference temperature setpoint causes the liquid fuel secondary isolation valve to shutoff the secondary fuel flow. The turbine is then unloaded and shutdown in the Primary mode. Refer to the Control Specifications for the correct settings for a specific turbine.

DLN1_DSC.DOC rev. 1.0 19 April, 2001 j rc

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DLN-1 System Annunciator Troubleshooting Chart The following is a list of additional alarms and corrective actions for a gas turbine supplied with DLN-1 DLN-1 and related systems. This list is intended to be a supplement to the Annunciator Annunciator chart contained in the standard gas turbine operating procedures.

DLN-1 ALARMS

ALARM MESSAGE MESSAGE L30FX1_ALM FAILURE TO FLAME OUT PRIMARY DURING TRANSFER ALARM L94FX1 FAILURE TO FLAME OUT PRIMARY DURING TRANSFER - TRIP L30FX3_ALM FAILURE TO RE-IGNITE PRIMARY AFTER SEC SEC LOAD RECOVERY - ALARM

CAUSE FLAME FAILS TO EXTINGUISH IN THE PRIMARY ZONE

ACTION VERIFY CALIBRATION OF GSV, VALVE IS REACHING 0% STROKE

ABNORMALLY ABNORMALLY LOW LOAD RAISE LOAD TO REACH OPERATING POINT IN PREMIX MODE FLAME IN THE PRIMARY ZONE IS NOT DETECTED UPON RE-IGNITION

VERIFY PROPER OPERATION OF SPARK PLUGS, VERIFY CALIBRATION OF GSV VERIFY PROPER OPERATION OF SPARK PLUGS, VERIFY CALIBRATION OF GSV, VERIFY PROPER OPERATION OF PRIMARY FLAME DETECTORS VERIFY PROPER OPERATION OF SPARK PLUGS, VERIFY CALIBRATION OF GSV, VERIFY PROPER OPERATION OF PRIMARY FLAME DETECTORS CONSULT WITH GE TO RESOLVE FAILURE TO TRANSFER TO PREMIX IF EXTENDED LEAN LEAN IS SELECTED - NO ACTION VERIFY PROPER OPERATION OF SPARK PLUGS, VERIFY CALIBRATION OF GSV, VERIFY PROPER OPERATION OF PRIMARY FLAME DETECTORS

L94FX3 FAILURE TO RE-IGNITE PRIMARY AFTER SEC LOAD RECOVERY TRIP

FLAME IN THE PRIMARY ZONE IS NOT DETECTED UPON RE-IGNITION

L83LLEXT_ALM EXT LEAN-LEAN MODE HIGH EMISSIONS

UNIT FAILED TO TRANSFER TO PREMIX STEADY STATE MODE, OR WAS SELECTED TO OPERATE IN EXTENDED LEAN LEAN FLAME IN THE PRIMARY ZONE IS NOT DETECTED UPON RE-IGNITION

L30FX2_ALM FAILURE TO RE-IGNITE PRIMARY ZONE - ALARM


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ALARM MESSAGE MESSAGE L94FX2 FAILURE TO RE-IGNITE PRIMARY ZONE - TRIP

CAUSE FLAME IN THE PRIMARY ZONE IS NOT DETECTED UPON RE-IGNITION

L86GSVA GAS SPLITTER VALVE CONTROL TROUBLE

GSV COMMAND SETPOINT DIFFERENT FROM ACTUAL POSITION GSV COMMAND SETPOINT DIFFERENT FROM ACTUAL POSITION FOR AN EXTENDED PERIOD GSV SERVO TROUBLE, SERVO CURRENT EXCESSIVE, LVDT DRIFTING, VALVE DRIFTING GTV COMMAND SETPOINT DIFFERENT FROM ACTUAL POSITION GTV COMMAND SETPOINT DIFFERENT FROM ACTUAL POSITION FOR AN EXTENDED PERIOD GTV SERVO TROUBLE, SERVO CURRENT EXCESSIVE, LVDT DRIFTING, VALVE DRIFTING INTERVALVE PRESSURE OUT OF LIMITS

L86GSVT GAS SPLITTER VALVE TROUBLE - TRIP

L3GSVFLT GAS SPLITTER VALVE POSITION TROUBLE

L86GTVA GAS TRANSFER VALVE CONTROL TROUBLE L86GTVT GAS TRANSFER VALVE TROUBLE - TRIP L3GTVFLT GAS TRANSFER VALVE POSITION TROUBLE L63PG2H_ALM GAS TRANSFER PURGE INTERVAVLE PRESS HIGH L86PGTLO_ALM GAS TRANSFER PURGE VALVE FAIL TO CLOSE

L30PGTOF_ALM TRANSFER PURGE VALVE FAULT


ACTION VERIFY PROPER OPERATION OF SPARK PLUGS, VERIFY CALIBRATION OF GSV, VERIFY PROPER OPERATION OF PRIMARY FLAME DETECTORS EXAMINE GSV FOR STICKY OPERATION, JAMMING AND LVDT TROUBLE EXAMINE GSV FOR STICKY OPERATION, JAMMING AND LVDT TROUBLE EXAMINE GSV SERVO VALVE AND LVDT'S FOR PROPER OPERATION EXAMINE GTV FOR STICKY OPERATION, JAMMING AND LVDT TROUBLE EXAMINE GTV FOR STICKY OPERATION, JAMMING AND LVDT TROUBLE EXAMINE GTV SERVO VALVE AND LVDT'S FOR PROPER OPERATION

EXAMINE PRESSURE SWITCHES, PROPER VALVE POSITION & ENSURE NO VALVE LEAKAGE TRANSFER PURGE VALVE VERIFY VALVE POSITION, FAIL TO CLOSE PROPERLY CHECK POSITION FEEDBACK DEVICES. CHECK ACTUATION SYSTEM, CHECK ACTUATION TIME PURGE VALVE FAIL TO OPEN VERIFY VALVE POSITION, PROPERLY CHECK POSITION FEEDBACK DEVICES. CHECK ACTUATION SYSTEM, CHECK ACTUATION TIME

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ALARM MESSAGE MESSAGE L86PGVL_ALM AUTO LOWERING LOAD LOAD GAS XFER PURGE VLV FAULT

L94GSDW COMBUSTION PROTECTION SHUTDOWN LOCKOUT

L83RBO REMOTE BREAKER OPEN DETECTED L4DLNT_ALM DLN SYSTEM TROUBLE TRIP

CAUSE ACTION PURGE VALVE FAIL TO OPEN VERIFY VALVE POSITION, PROPERLY - LOCKED OUT CHECK POSITION OF PREMIX OPERATION FEEDBACK UNTIL RESOLVED - MASTER DEVICES. CHECK RESET REQUIRED UPON ACTUATION RESOLUTION OF PROBLEM SYSTEM, CHECK ACTUATION TIME THE GAS SPLITTER VALVE DLN SYSTEM FAULT, POSITION IS GREATER THAN A UNSAFE TO OPERATE AT CONSTANT & THE LOAD IS CURRENT LOAD POINT. GREATER THAN A CONSTANT VERIFY TTRF1 & PRIMARY FLAME IS CALCULATION ACCURACY DETECTED & CONDITIONS EXISTS FOR 10 SECONDS UNIT IS STILL MODE TRANSITIONS WILL SYNCHRONIZED AND NOT BE POSSIBLE IN THIS OPERATING ON LOCAL GRID MODE, ESSENTIALLY ISOCHRONOUS OPERATION DLN SYSTEM FAULT, TRIP IS CHECK DLN SYSTEM TRIPS REQUIRED. AND ALL OTHER ANNUNCIATED ANNUNCIATED ALARMS ALARMS (M(MRESET REQUIRED)

DLN-1 Inlet Bleed Heat Option ALARM MESSAGE MESSAGE NO INLET HEATING AIR FLOW DETECTED

CAUSE LACK OF TEMPERATURE RISE AT INLET BELL- MOUTH WITH BLEED HEAT ENABLED

BLEED HEAT DRAIN VALVE FAIL TO CLOSE

IBH DRAIN VALVE STUCK OR FAULTY POSITION FEEDBACK

BLEED HEAT VALVE POSITION TROUBLE

IBH CONTROL VALVE STUCK OR FAULTY POSITION FEEDBACK CONTROL VALVE STUCK CLOSED OR FAULTY INLET THERMOCOUPLE READINGS MANUAL ISOLATION/STOP VALVE MAY BE CLOSED

BLEED HEAT SYS NOT OPERATIONAL - TRIP


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ACTION VERIFY MANUAL ISOLATION VALVE IS OPEN, VERIFY CONTROL VALVE OPERATION CHECK INLET THERMOCOUPLES INSPECT VALVE, VERIFY POSITION, CHECK POSITION FEEDBACK INSPECT VALVE, VERIFY POSITION, CHECK POSITION FEEDBACK OBSERVE THE CONTROL STROKE AND CHECK THE INLET THERMOCOUPLES. CHECK THE MANUAL ISOLATION VALVE

DLN-1 Liquid Fuel Option ALARM MESSAGE MESSAGE L33PGFT GAS FUEL PURGE VALVE FAIL TO CLOSE

L33PGO_ALM GAS FUEL PURGE VALVE FAIL TO OPEN

L94PGT GAS FUEL PURGE PROBLEM-TRIP

L30PLP_ALM PRIMARY LIQUID FUEL PURGE PRESSURE LOW - ALARM

L86PLP PRIMARY LIQUID FUEL PURGE PRESSURE LOW - TRIP

L30PLS_ALM SECONDARY LIQUID FUEL PURGE PRESSURE LOW - ALARM

L86PLS SECONDARY LIQUID FUEL PURGE PRESSURE LOW - TRIP


CAUSE PURGE VALVE FAIL TO CLOSE PROPERLY

ACTION VERIFY VALVE POSITION, CHECK POSITION FEEDBACK DEVICES. CHECK ACTUATION SYSTEM, CHECK ACTUATION TIME PURGE VALVE FAIL TO OPEN VERIFY VALVE POSITION, PROPERLY CHECK POSITION FEEDBACK DEVICES. CHECK ACTUATION SYSTEM, CHECK ACTUATION TIME PURGE VALVE FAIL TO VERIFY VALVE POSITION, FOLLOW REFERENCE CHECK POSITION FEEDBACK DEVICES. CHECK ACTUATION SYSTEM, CHECK ACTUATION TIME INADEQUATE PRIMARY CHECK FOR PROPER LIQUID FUEL PURGE SOLENOID OPERATION, PRESSURE INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION INADEQUATE PRIMARY CHECK FOR PROPER LIQUID FUEL PURGE SOLENOID OPERATION, PRESSURE FOR AN INSTRUMENT AIR, EXTENDED PERIOD OF TIME PRESSURE SWITCH OPERATION AND CALIBRATION INADEQUATE SECONDARY CHECK FOR PROPER LIQUID FUEL PURGE SOLENOID OPERATION, PRESSURE INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION INADEQUATE SECONDARY CHECK FOR PROPER LIQUID FUEL PURGE SOLENOID OPERATION, PRESSURE FOR AN INSTRUMENT AIR, EXTENDED PERIOD OF TIME PRESSURE SWITCH OPERATION AND CALIBRATION

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ALARM MESSAGE MESSAGE L30PWP_ALM PRIMARY WATER INJECTION PURGE PRESSURE LOW - ALARM

CAUSE INADEQUATE PRIMARY WATER INJECTION PURGE PRESSURE

L86PWP PRIMARY WATER INJECTION PURGE PRESSURE LOW - TRIP

INADEQUATE PRIMARY WATER INJECTION PURGE PRESSURE FOR AND EXTENDED PERIOD OF TIME

L30PWS_ALM SECONDARY WATER WAT ER INJECTION PURGE PRESSURE LOW - ALARM

INADEQUATE SECONDARY WATER INJECTION PURGE PRESSURE

L86PWS SECONDARY WATER INJECTION PURGE PRESSURE LOW - TRIP

INADEQUATE SECONDARY WATER INJECTION PURGE PRESSURE FOR AND EXTENDED PERIOD OF TIME

L30PCD_ALM PURGE FAULT DETECTION INOPERABLE CPD LOW PRESSURE- ALARM L33FK1C_ALM OIL SPLITTER VALVE FAIL TO OPEN L33FK1O_ALM OIL SPLITTER VALVE FAIL TO CLOSE

DETECTED ABNORMALLY LOW COMPRESSOR DISCHARGE PRESSURE


OIL SPLITTER VALVE REMAINS DETECTED CLOSE OIL SPLITTER VALVE IS NOT DETECTED CLOSE

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ACTION CHECK FOR PROPER SOLENOID OPERATION, INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION CHECK FOR PROPER SOLENOID OPERATION, INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION CHECK FOR PROPER SOLENOID OPERATION, INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION CHECK FOR PROPER SOLENOID OPERATION, INSTRUMENT AIR, PRESSURE SWITCH OPERATION AND CALIBRATION CHECK CPD CONNECTIONS, PRESSURE SWITCH OPERATION AND CALIBRATION CHECK VALVE POSITION, POSITION LIMIT SWITCH, ACTUATION SOURCE CHECK VALVE POSITION, POSITION LIMIT SWITCH, ACTUATION SOURCE

DLN-1 WATER INJECTION OPTION ALARM MESSAGE MESSAGE L26WNL_ALM LOG ; WATER INJECTION WATER TEMPERATURE TEMPERATURE LOW L63WN3H_ALM LOG ; WATER INJECTION FILTER DIFF PRESS HIGH L20WN9X_ALM LOG ; WATER INJ. ISOLATION SHEAR VLV PRI. TROUBLE L49WN1X_ALM LOG ; WATER INJECTION MOTOR OVERLOAD ALARM L20WN10X_ALM LOG ; WATER INJ. ISOLATION SHEAR VLV SEC. TROUBLE


CAUSE INADEQUATE INADEQUATE WATER INJECTION SUPPLY TEMPERATURE

ACTION CHECK WATER SOURCE SUPPLY, HEATERS, TEMPERATURE LIMITS

FILTER IS BECOMING CLOGGED

REPLACE FILTER

VALVE IS NOT FOLLOWING REFERENCE MOTOR IS REQUIRED AN EXCESSIVE AMOUNT OF CURRENT VALVE IS NOT FOLLOWING REFERENCE

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CHECK VALVE POSITION, POSITION LIMIT SWITCH, ACTUATION SOURCE CHECK FOR EXCESSIVE MOTOR LOADING, EXCESSIVE HEAT, MOTOR DAMAGE, PUMP DAMAGE CHECK VALVE POSITION, POSITION LIMIT SWITCH, ACTUATION SOURCE

15-DLN1 Rev.1.0 April2001 (Dry Low NOx 1 System Operation)

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