Chapter 1. Gas Turbine Package & Systems Overview

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Chapter 1

Gas Turbine Package &

Systems Overview

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Chapter 1 Gas Turbine Package &

Systems Overview

CONTENTS

Gas Turbine Engine Section 1.

Lubricating Oil System Section 2.

Fuel System Section 3.

Engine Auxiliary System Section 4.

Air Distribution System Section 5.

Starting System Section 6.

Turbine Underbase, Acoustic Enclosure

and Air Supply/Exhaust Systems Section 7.

Fire and Gas Protection System Section 8.

Gearbox and Generator Section 9.

Control Panels and Electrical Equipment Section 10.

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Gas Turbine Sectional Arrangement

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Cooling and Sealing Air System Diagram

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1. Gas Turbine Engine

1.1. Introduction

The SGT-300 is a single shaft, simple open cycle, non–regenerative industrial gas turbine designed for constant speed operation driving an AC generator through a reduction gearbox.

1.2. General Description

Refer to the Sectional Arrangement Drawing located at the end of this section.

The turbine consists of a radial inlet casing through which air enters the ten stage axial compressor for compression prior to entry to the combustion system.

The combustion system employs reverse flow combustion chambers to mix, burn and expand the air fuel mixture to drive the two stage turbine assembly and exit through the exhaust diffuser.

The integrated compressor and turbine rotor assembly is supported and located by journal and thrust bearings in the inlet and compressor turbine bearing housings.

A cold end driven epicyclic gearbox is used to reduce the turbine speed to that consistent with the AC generator.

1.2.1. Air Inlet Casing

The air inlet casing is secured to the gearbox casing and inlet bearing housing and is shaped to provide a smooth path for the incoming airflow to the compressor. An inlet screen, and a flexible joint which accommodates relative movements due to thermal expansion, are fitted to the rectangular casing entry point to which external ducting is connected.

1.2.2. Inlet Bearing Housing

The inlet bearing housing, which is mounted on the main gearbox/turbine support casing, provides support for the air inlet casing and low pressure compressor stator casing. A tilting pad journal and thrust bearing assembly within the housing supports and locates the inlet end of the turbine rotor.

1.2.3. Compressor Stator Casings

The compressor stator casings consist of a low pressure casing and a high pressure insert in which are located the compressor stator blades.

The low pressure stator casing is split along its centre line and flanged to the inlet bearing housing at its inlet end and the turbine centre casing at its exit end.

Boroscope access holes are provided in the top half casing to enable examination of the compressor stator and rotor blades.

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Variable geometry inlet guide vanes form the first four rows of compressor stator blading to facilitate starting and prevention of compressor surge. An externally mounted operating mechanism controls the movement of the vanes. The remaining low pressure stator blades are retained by dovetail grooves in the casing.

The high pressure stator casing is in the form of an insert split along its horizontal centre line and located in the centre casing. The high pressure stator blades are retained by dovetail grooves in the insert.

1.2.4. Compressor Turbine Bearing Housing

The compressor turbine bearing housing provides support for the hot end of the turbine assembly including the combustion, power turbine stator and exhaust systems. A tilting pad journal bearing provides support for the exit end of the turbine rotor.

1.2.5. Turbine Rotor Assembly

The gas turbine rotor assembly comprises of Compressor and Turbine rotor sections.

The compressor rotor is a single spool 10 stage axial design made up of a series of discs carrying dovetail rooted compressor blades, located together with Hirth couplings at the outside diameter and held together with a central tension bolt.

The Turbine Rotor is a two stage axial design consisting of one high pressure (HP) and one low pressure (LP) rotor disc carrying fir tree rooted turbine blades.

The turbine rotor discs are overhung from the compressor rotor, located with Hirth couplings and secured to the compressor rotor with a central tension stud bolt.

1.2.6. Combustion System

The combustion system comprises of six symmetrically positioned combustion chambers which are inclined at 30 degrees to the engine axis.

The system is of the reverse flow design. Air leaving the compressor exit nozzle is reversed and enters the heads of the combustion chambers via swirler plates which impart a rapid swirling motion to the flow to ensure complete mixing of fuel and air.

1.2.7. Turbine Pressure Casing

The turbine pressure casing is flanged to the turbine bearing housing and provides location for the turbine stator assembly and support for the exhaust diffuser.

1.2.8. Exhaust Diffuser

The lagged exhaust diffuser, which is mounted on the turbine pressure casing, provides diffusion of the exhaust gases for the exhaust ducting system.

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1.2.9. Gearbox

The turbine drive shaft is connected to a gearbox which reduces the speed for the generator drive. The gearbox, which is epicyclic and reverses the direction of rotation of the power shafting, is mounted on the underbase.

The gearbox also provides auxiliary power inputs and outputs for the starting system and the main lubricating oil system.

1.2.10. Cooling and Sealing Air System

Compressor air is used for sealing at labyrinth seals and cooling of high temperature components.

Refer to Cooling and Sealing Air diagram located at the end of this section.

Medium pressure air, taken from the bleed band at the sixth stage of the compressor, is used to:

i) Pressurise the inlet labyrinth seal

ii) Pressurise the labyrinth seals located either side of the compressor turbine journal bearing to prevent stage ten high pressure air entering the bearing housing.

Stage ten high pressure bleed air taken from before the compressor exit guide vane is used to:

i) Balance the medium pressure air used to pressurise the labyrinth seals at the compressor journal bearing

ii) Cool the turbine rotor discs and the interstage diaphragm.

Compressor exit air is used to:

i) Cool the high pressure (HP) nozzle assembly via holes in the nozzle inner and outer carrier rings into the cooling tube of each nozzle followed by discharge into the gas stream by trailing edge slots.

ii) Cool the high pressure rotor blades via their triple pass convection system prior to being ejected into the gas stream.

Used medium pressure air is vented to atmosphere through the secondary breather system. Used stage ten high pressure air is vented into the exhaust system through the primary breather system.

1.3. Instrumentation

1.3.1. Turbine Instrumentation

Instrumentation is provided to monitor the turbine parameters and provide warning and trip control functions.

A schematic diagram of the instrumentation can be found at the end of this section

Temperature Monitoring

Resistance temperature detectors (RTD1 and RTD48) mounted in the air inlet casing, and thermocouples (TC1 to TC13 inclusive) mounted in the exhaust outlet monitor turbine operating temperature and temperature deviation.

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Additionally the outlet thermocouples monitor combustion condition and will shut the turbine down in the event of flame out in one of the combustion chambers.

Single plus redundant thermocouples (TC21 to TC24, TC91 to TC92 and TC261 to TC262 inclusive) positioned in the appropriate bearings, measure journal and thrust bearing temperatures.

Speed monitoring

Speed probes (SD3 and SD6) are used for speed detection and overspeed protection, and speed probes (SD1, SD2 and SD5) are used for speed control indication and overspeed protection. Probes monitor from the cold end of the compressor rotor.

Vibration Monitoring

X-Y non–contacting vibration probes (UD10X1, UD10Y1, UD11X1 and UD11Y1) are provided adjacent to each rotor journal bearing to monitor radial vibration.

Probes (UD10X2, UD10Y2, UD11X2 and UD11Y2) are fitted as non–active spares.

Axial non contacting vibration probes (ZD10T1 and ZD10T2) monitor axial rotor movements at the inlet end of the compressor.

Key phaser probe (ND10K1) provides a phase angle reference. Key phaser probe (ND10K2) is fitted as a non-active spare.

Pressure Monitoring (Applicable to DLE Engines only)

Pressure transmitters are provided to facilitate engine control as follows:

i) Turbine compressor exit pressure (PT8).

ii) Power turbine exit pressure (PT259).

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Turbine Instrumentation Schematic Diagram

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Tag No. Description Tag No. Description

HV67 Isolating and Vent/Calibrating Valve TC21R Thermocouple, GG Inlet Thrust Bearing (Redundant)

HV187 Isolating and Vent/Calibrating Valve TC22 Thermocouple, GG Inlet Thrust Bearing (Redundant)

ND10K1 Key Phasor, Gas Generator TC22R Thermocouple, GG Inlet Thrust Bearing (Redundant)

ND10K2 Key Phasor, Gas Generator

(Redundant) TC23 Thermocouple, GG Inlet Journal Bearing PT8 Pressure Transmitter, Comp.

Discharge Pressure TC23R Thermocouple, GG Inlet Journal Bearing (Redundant)

PT259 Pressure Transmitter, Power Turbine

Exit TC24 Thermocouple, GG Outlet Journal

Bearing RTD1 Resistance Temperature Detector,

Combustion Air Intake TC24R Thermocouple, GG Outlet Journal Bearing (Redundant)

RTD48 Resistance Temperature Detector,

Combustion Air Intake TC91 Thermocouple, GG Inlet Journal Bearing SD1 Speed Probe, Speed Control

Indication and Overspeed Protection TC91R Thermocouple, GG Inlet Journal Bearing (Redundant)

SD3 Speed Probe, Overspeed Protection TC92 Thermocouple, GG Outlet Journal Bearing

SD5 Speed Probe, Speed Control

Indication and Overspeed Protection TC92R Thermocouple, GG Outlet Journal Bearing (Redundant)

SD6 Speed Probe, Speed Control

Indication and Overspeed Protection (Redundant)

TC261 Thermocouple, GG Inlet Thrust Bearing

TC1 Thermocouple, Exhaust TC261R Thermocouple, GG Inlet Thrust Bearing (Redundant)

TC2 Thermocouple, Exhaust TC262 Thermocouple, GG Inlet Thrust Bearing TC3 Thermocouple, Exhaust TC262R Thermocouple, GG Inlet Thrust Bearing

(Redundant)

TC4 Thermocouple, Exhaust UD10X1 Vibration Probe, GG Inlet End X-Axis TC5 Thermocouple, Exhaust UD10X2 Vibration Probe, GG Inlet End X-Axis

(Redundant)

TC6 Thermocouple, Exhaust UD10Y1 Vibration Probe, GG Inlet End Y-Axis TC7 Thermocouple, Exhaust UD10Y2 Vibration Probe, GG Inlet End Y-Axis

(Redundant)

TC8 Thermocouple, Exhaust UD11X1 Vibration Probe, GG Outlet End X-Axis TC9 Thermocouple, Exhaust UD11X2 Vibration Probe, GG Outlet End X-

Axis(Redundant)

TC10 Thermocouple, Exhaust UD11Y1 Vibration Probe, GG Outlet End Y-Axis TC11 Thermocouple, Exhaust UD11Y2 Vibration Probe, GG Outlet End Y-

Axis(Redundant)

TC12 Thermocouple, Exhaust ZD10T1 Vibration Probe (Axial), GG Inlet TC13 Thermocouple, Exhaust ZD10T2 Vibration Probe (Axial), GG Inlet TC21 Thermocouple, GG Inlet Thrust

Bearing

Key to Turbine Instrumentation Schematic Diagram

Note: Refer to Contract Piping and Instrumentation Diagram listed in the front sheets of this manual for specific detail applicable to this application.

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Turbine Auxiliary Equipment Schematic Diagram

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1

Tag No. Description Tag No. Description

FLX73 Flexible Pipe, Waterwash Supply XV59 Interstage Bleed Valve FLX125 Flexible Pipe, Waterwash Supply XV60 Pilot Valve, Interstage Bleed HV1007 Hand Valve, Waterwash On-Line /

Off-Line 3 Way Diverter XX42 Force Feedback, Variable Guide Vane Actuator

TD44 Temperature Detector, Internal VGV Actuator Temperature (High Force)

ZC4 Position Drive Signal, Variable Guide Vane Actuator

XF27 Filter, Last Chance to Waterwash

Nozzles ZT9 Position Transmitter, Variable

Guide Vane Actuator XF146 Filter, Last Chance to Waterwash

Nozzles ZZ8 Variable Guide Vane Actuator

Key to Turbine Auxiliary Equipment Schematic Diagram

Note: Refer to Contract Piping and Instrumentation Diagram listed in the front sheets of this manual for specific detail applicable to this application.

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2. Lubricating Oil System

Lubricating oil is used to lubricate and cool the turbine journal and thrust bearings, the generator bearings and the gearbox bearings, gears and splines.

The oil is also used as a hydraulic oil to operate the hydraulic starting system when starting the turbine.

The oil is delivered from an on-skid lubricating oil tank and circulated throughout the lubricating system under normal running conditions by a main oil pump. The system includes a temperature control valve, pressure control valve, filter, instrumentation and associated piping to provide the correct delivery conditions.

The used oil is returned to the tank by gravity drainage to create a continuously circulating system.

Heat is removed from the oil by an oil cooler circuit which is controlled by the temperature control valve.

A lubricating oil tank breather system is provided to vent to atmosphere oil fumes that are generated whilst the turbine is running.

A schematic diagram of the lubricating oil system is located at the rear of this section.

2.2.1. Lubricating Oil Tank

The lubricating oil tank is integrated into the underbase fabrication and is provided with internal baffles to aid circulation and maximise removal of entrapped air. Covers are provided to facilitate cleaning of the interior if contamination occurs.

The tank is fitted with immersion heater(s) to maintain the correct pre-start oil temperature. Integral thermal protection is provided.

Flip lid filler point(s) with integral strainers are provided for filling and replenishment.

Level gauge(s) provide visual indication of the oil level within the oil tank.

2.2.2. Lubricating Oil Pumps

Three lubricating oil pumps are provided:

i) The main pump (XP1) which is mounted on, and driven by the auxiliary gearbox, provides lubrication during normal running.

ii) The auxiliary pump (XP2) which is mounted within the lubricating oil tank and driven by an AC motor, provides lubrication during turbine start, run up and post shutdown.

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iii) The emergency pump (XP3) which is mounted within the lubricating oil tank and driven by a DC motor, provides essential lubrication to the turbine hot bearing in the event of the auxiliary pump or AC power failure, during or after shutdown.

Circulation between the three pumps is controlled by non-return valves, located in each pump delivery system.

Each pump is provided with a pressure relief valve to guard against over- pressurisation.

A strainer is provided at each pump suction inlet.

2.2.3. Temperature Control Valve

A temperature control valve (XV428) operates at a set value to divert lubricating oil through the oil cooler (TH1) as necessary to maintain the temperature of the oil at the optimum level.

2.2.4. Pressure Control Valve

The oil pressure to the bearings during turbine running is maintained at a constant pressure by pressure control valve (PCV1). The excess oil is spilled back through the valve to the lubricating oil tank.

2.2.5. Lubricating Oil Filters Two filters are provided:

i) The main filter(s) (XF2 and XF3), which are installed downstream of the pressure control valve, filters the main line flow of lubricating oil from the main and auxiliary pumps.

ii) The lubricating oil flow from the DC motor driven emergency pump, which is separate from the main line flow, is filtered by an emergency filter (XF4).

2.2.6. Oil Cooler Circuit

An oil cooler circuit incorporating an air blast oil cooler (TH1) is used to dissipate heat from the lubricating oil prior to its entry into the main supply line. Flow to the cooler circuit is controlled by the temperature control valve (XV428).

Non return valves (XV26 and XV27) are fitted in the supply and return lines to prevent the lubricating oil draining back to the tank when the turbine is shutdown.

2.2.7. Oil Mist Eliminator

An oil mist eliminator (XF7) is provided in the lubricating oil tank breather system to reduce the amount of oil mist being exhausted to atmosphere.

2.2.8. Lubricating Oil Tank Breather System Flame Trap

The breather system contains a flame trap (XF6) to prevent the ignition of any oil mist which may cause a subsequent explosion in the lubricating oil tank.

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2.2.9. Secondary Breather Flame Trap

A flame trap (XF15) is fitted in the compressor turbine secondary breather system to prevent the ignition of any oil mist which may cause a subsequent explosion in the breather passages.

2.3. Instrumentation

Instrumentation is provided to monitor the lubricating oil system parameters, provide warning and trip control functions.

Refer to the Lubricating Oil System schematic diagram located at the rear of this section.

2.3.1. Temperature Monitoring

A resistance temperature detector (TT7) mounted in the lubricating oil supply tank monitors the tank oil temperature and provides a permissive signal for tank immersion heater(s) control. The information is also used to inhibit a start until the tank oil temperature is above a set value.

The temperature of the lubricating oil is measured by resistance temperature detectors (TT66A and TT66B) mounted in the manifold block to provide high oil temperature warning and shutdown.

2.3.2. Pressure Monitoring

Pressure transmitters (PT6A and PT6B) are mounted in the compressor turbine supply line to provide lubricating oil pressure low/high warning and emergency lubricating oil pump control signals.

The pressure drop across the main lubricating oil filter assembly is monitored by a pressure differential transmitter (PDT8) to provide a warning of deteriorating element condition.

Each main lubricating oil filter housing (XF2, XF3) and the emergency oil filter housing (XF4) is fitted with a pop up indicator button to provide a visual indication of filter blockage.

2.3.3. Lubricating Oil Tank Level Monitoring

A level transmitter (LT1) is used to monitor the level of the oil in the lubricating oil tank. The information provided is used to inhibit starts if the oil level is below a set value during the gas turbine starting process and to annunciate a warning or shutdown if the oil level falls below a set value during normal gas turbine operation.

The level transmitter is also used to inhibit the operation of the immersion heater(s) if the level of the oil in the tank is below a pre-determined level.

2.4. Lubricating Oil System Requirements

In normal conditions the turbine is designed to run on oil to ISO/VG46 in accordance with company Fluids Specification 65/0027, which is available on request. Where, due to prevailing ambient conditions or driven machinery requirements, it is necessary to use a heavier or lighter viscosity grade of oil,

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ISO/VG68 or ISO/VG32 may be used respectively. However, the company must be consulted before the use of these alternative oils.

CAUTION:

IT IS IMPORTANT TO USE THE CORRECT TYPE OF LUBRICATING OIL. THE USE OF OIL WITH INSUFFICIENT OR INCORRECT ADDITIVES WILL CAUSE OIL PERFORMANCE TO DETERIORATE.

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Lubricating Oil System - Schematic Diagram

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Tag No. Description Tag No. Description

DCC3 Direct Current Control MCC200 Motor control centre order signal

FI1 Flow Indicator, Oil to Driven Unit MCC380A Motor Control Centre order signal temperature switch

FI2 Flow Indicator, Oil to Driven Unit MCC380B Motor Control Centre order signal temperature switch

FI30 Flow Indicator, Main Filter Vent Valve PCV1 Pressure Control Valve, Oil Supply to Brgs FI31 Flow Indicator, Standby Filter Vent Valve PDI1 Differential Pressure Indicator, Main Oil Filter

(Pop-Up Type)

FLX20A Flexible Pipe PDI90 Differential Pressure Indicator, Emergency Oil Filter (Pop-Up Type)

FLX20B Flexible Pipe PDT8 Differential Pressure Transmitter, Main Oil Filter

FLX30 Flexible Pipe, CT Bearing Breather PDT44 Differential pressure transmitter monitoring the differential pressure over the lube oil mist coalescer

FLX83 Flexible Pipe, Supply to CT Journal Brg PI5 Pressure Gauge, Turbine Oil Supply FLX88 Flexible Pipe, Oil Line to Cooler PI202 Pressure Gauge, I/P Converter FLX89 Flexible Pipe, Oil Line from Cooler PSV7 Pressure Relief Valve, Main Oil Pump FLX107 Flexible Pipe, RH CT Drain PSV8 Pressure Relief Valve, Auxiliary Oil Pump FLX108 Flexible Pipe, LH CT Drain PSV9 Pressure Relief Valve, Emergency Oil Pump FLX123 Flexible Pipe, CT Brg Primary Breather PT6A Pressure Transmitter, Oil Supply to CT Brgs FO91 Flow Restrictor, Supply to CT Brg PT6B Pressure Transmitter, Oil Supply to CT Brgs FO110 Flow Orifice, Filter Element Vent Valve PT6C Pressure Transmitter, Oil Supply to CT Brg FO111 Flow Orifice, Filter Element Vent Valve TH1 Lube Oil Cooler (Air Blast)

FO119 Flow Orifice, Oil PCV1 Drain TI2 Temperature Gauge, Turbine Oil Supply HS24 Local Stop Pushbutton, Lube Oil Cooler

Fan TS38A Temp. Switch, Oil Heater High Temp. Cut-out

HS26 Local Stop Pushbutton, Auxiliary Pump

Motor TS38B Temperature Switch, Oil Heater Thermostat

HS29 Local Stop Pushbutton, Emergency

Pump Motor TS39A Temp. Switch, Oil Heater High Temp. Cut-out HS56 Local Stop Pushbutton, Lube Oil Cooler

Fan TS39B Temperature Switch, Oil Heater Thermostat

HS67 Local Stop Pushbutton, Lube Oil Cooler

Fan TS40A Temp. Switch, Oil Heater High Temp. Cut-out

HV1A Hand Valve, Oil Filter Element Drain TS40B Temperature Switch, Oil Heater Thermostat HV1B Hand Valve, Oil Filter Element Drain TS134 Temperature Switch, Oil Cooler Inlet Header

Immersion Heater Thermostat

HV28A Isolating and Vent/Calibrating Valve TS135 Temperature Switch, Oil Cooler Outlet Header Immersion Heater Thermostat

HV28B Isolating and Vent/Calibrating Valve TT7 Temperature Transmitter, Oil Tank HV28C Isolating and Vent/Calibrating Valve

HV29 Isolating and Vent/Calibrating Valve

(option) TT66A Temperature Transmitter, Oil Manifold

HV57 Isolating, Vent/Calibrating and Equalising

Valve TT66B Temperature Transmitter, Oil Manifold

HV59 Control Valve, Oil Supply to Generator

Brg XF1 Suction Strainer, Main Oil Pump

HV60 Control Valve, Oil Supply to Generator

Brg XF2 Duplex Filter, Main Oil

HV184 Changeover Valve, Duplex Filter XF3 Duplex Filter, Main Oil HV305 Isolation Valve, Lub Oil Conditioner

Outlet XF4 Filter, Emergency Oil Supply

HV306 Isolation Valve, Lub Oil Conditioner

Return XF5 Strainer, Oil Filler

Key to Lubricating Oil System Schematic Diagram (1)

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HV351 Drain Valve, Lubricating Oil Tank XF6 Flame Trap, Oil Tank Breather Line HV561 Hand Valve, Oil Filter Balance Line XF7 Oil Mist Eliminator

HV562 Hand Valve, Oil Cooler Return Strainer

Isolation XF15 Flame Trap, CT Brg Breather Line

HV566 Hand Valve, Manifold Flushing Diverter XF16 Suction Strainer, Auxiliary Oil Pump HV605 Drain Valve, Strainer (XF186) XF17 Suction Strainer, Emergency Oil Pump HV615B Hand Valve, Lube Oil Tank Level Gauge

Isolation XF133 Strainer, External Oil Tank Filler

HV1001 Hand Valve, Oil Cooler Supply Line Drain XF186 Strainer in Oil Cooler Return Line HV1002 Hand Valve, Oil Cooler Return Line Drain XM1 AC Motor, Auxiliary Oil Pump HV1423 5 valve manifold Monitoring of Differential

Pressure of Lub Oil Coalescer XM2 DC Motor, Emergency Oil Pump IH1 Immersion Heater. Lube Oil Tank XM11 Electric Motor AC. Lube Oil Cooler Fan IH2 Immersion Heater. Lube Oil Tank XM33 Electric Motor AC. Lube Oil Cooler Fan IH3 Immersion Heater. Lube Oil Tank XM70 Motor Lube Oil Cooler Fan 3

IH36 Immersion Heater. Lube Oil Cooler XP1 Pump, Main Lubricating Oil IH37 Immersion Heater. Lube Oil Cooler XP2 Pump, Auxiliary Lubricating Oil IH38 Immersion Heater. Lube Oil Cooler XP3 Pump, Emergency Lubricating Oil IY14 I/P Converter, PCV1 Fill XV2 Non Return Valve, Auxiliary Oil Supply LG1 Sight Glass, Oil Tank XV5 Non Return Valve, Emergency Oil Supply to

Brgs

LG19 Sight Glass, Lube Oil Tank XV26 Non Return Valve, Oil Cooler Outlet LT1 Level Transmitter, Oil Tank XV27 Non Return Valve, Oil Cooler Inlet MCC3 Motor control centre order signal XV52 Non Return Valve, Oil to CT Bearing MCC4 Motor Control Centre XV428 Temperature Control Valve, Oil

MCC8 Motor Control Centre ZC42 Position Drive Signal, Oil Temperature Control Valve

MCC8A Motor Control Centre ZC48 Position Drive Signal, PCV1 Pressure Control MCC8B Motor Control Centre ZY31 Position Converter, Oil Temperature Control

Valve MCC17 Motor control centre order signal

Key to Lubricating Oil System Schematic Diagram (2)

Note: Refer to Contract Piping and Instrumentation Diagram for specific details.

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3. Fuel System

The fuel system is designed to deliver either gas or liquid fuel to the combustion system at the correct pressure and flow required for the applicable power demand.

The burner arrangement provides for forward/reverse purging of the liquid fuel during fuel changeover and turbine shut down.

The liquid purges are designed to prevent fuel being trapped in the burners, decomposing and carburising/blocking the burner nozzle. The forward purge also provides cooling for the burner walls to further assist the prevention of blockages.

An air assist system aids liquid fuel combustion.

A schematic diagram of the fuel system is located at the rear of this section.

The fuel system comprises of:

Off-skid Components

i) block and vent valve assembly (XV30, XV31) ii) demister (XX5) (if applicable)

On-skid components

i) gas fuel supply strainer (XF94) ii) two block valves (XV6, XV7) iii) vent valve (XV212)

iv) main fuel control valve/actuator assembly (XV150, XM26) v) pilot fuel control valve/actuator assembly (XV149, XM27) vi) electronic control unit

vii) system monitoring and control instrumentation viii) pipeline trace heating (if applicable).

3.3. Gas Fuel System Components 3.3.1. Off–Skid Block and Vent Valve

The block and vent valve assembly is located in the customers gas supply line.

The assembly comprises of a block valve (XV30) and a vent valve (XV31). Both valves are controlled by pneumatically operated rotary actuators. Air is directed to the actuators by solenoid valves (SOL12 and SOL11) respectively. When the situation demands, the block valve closes to prevent gas entering the on-skid fuel system and the vent valve opens to vent the interconnecting pipework.

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The block valve is spring loaded to fail in the ‘closed’ position. The vent valve is spring loaded to fail in the ‘open’ position.

3.3.2. Coalescer Filter (if applicable)

The off-skid coalescer filter (XX5) is used to remove liquids from the gas fuel.

The gas enters the vessel at the inlet pipe and passes through a special filter element into the top chamber, from where it leaves the vessel in a clean dry condition via the outlet pipe.

3.3.3. Pipeline Trace Heating (if applicable)

The gas fuel pipelines are trace heated to prevent the formation of condensation in the gas system.

3.3.4. Block Valves

The primary (XV7) and secondary (XV6) block valves provide isolation of the on–skid fuel system from the gas supply. They are controlled by integral actuators which are operated by instrument air and spring pressure. The instrument air supply to the actuators is controlled by pilot solenoids (SOL5 and SOL110).

The block valves are designed to fail in the closed position.

3.3.5. Vent Valve

The vent valve (XV212) provides for venting of the gas fuel pipework between the two block valves on turbine shutdown. The valve is controlled by an integral actuator operated by instrument air and spring pressure. The instrument air supply to the actuator is controlled by a pilot solenoid (SOL470).

The vent valve is designed to fail in the open position.

3.3.6. Fuel Control Valve/Actuator Assemblies

The main and pilot fuel control valves (XV150 and XV149) are of the rotary ball valve type and operated through a zero backlash coupling by electrically operated rotary actuators (XM26 and XM27). Each valve/actuator assembly is rigidly fixed to a frame and firmly mounted and connected into the fuel system.

The valves are calibrated and set up to meter the fuel flow to the burners under the control of an integral electronic control unit. Integral position transmitters (ZT12 and ZT103) monitor the position of the control valve actuators.

3.3.7. Electronic Control Unit (ECU)

The ECU is an integral part of the fuel system and interfaces with the fuel control valve actuator and the turbine governor to provide accurate fuel control, utilising a high speed microprocessor at its heart.

The ECU constantly receives fuel condition input signals, and uses this information to calculate the correct position of the fuel valve according to the flow rates demanded by the turbine governor. The ECU also provides feedback of valve position and fault conditions to the turbine control system.

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3.4. Liquid Fuel System General Description

A schematic diagram of the liquid fuel system is located at the rear of this section.

The liquid fuel system comprises of components as follows:

Off-skid Components

i) block valve assembly (XV75) ii) hand valve, isolating (HV39) On-skid components

iii) AC electric motor, liquid fuel pump drive (XM5)

iv) tandem fuel pump and metering valve assembly (XP36, XP37, XV213, XV214)

v) selector yalve, purge/fuel supply to pilot and main liquid burners (XV423A, XV423B)

vi) duplex filter assembly (XF19, XF98) 3.4.1. Tandem Fuel and Metering Valve Assembly

The complete assembly consists of two pressure compensated radial piston pump (XP36, XP37) and metering valve assemblies (XV213, XV214) driven in tandem from a single motor (XM5) via a bellhousing and flexible coupling. One pump assembly controls fuel flow to the pilot burner, the other pump assembly controls fuel flow to the main burner.

Each pump assembly is made up of a variable displacement radial piston pump with a control manifold block mounted directly on the discharge port and a pressure compensation valve mounted on the pump control piston. A direct drive valve (DDV) controlled by the engine governor is mounted on each control manifold block. The pressure compensation valve adjusts pump displacement to maintain a constant pressure drop across the DDV which meters flow to the engine. The main pump has a manifold block mounted on the suction port bringing together the suction ports of the two pumps to a single connection.

Each control manifold block has two cartridge valves (PSV171, PSV172) to limit system pressure. One of the cartridge valves de-strokes the pump if burner pressure exceeds the spring setting and the other valve is a safety relief valve on the pump delivery. Under normal circumstances the de-stroking valve should limit the maximum pump delivery pressure so that the relief valve does not open.

3.4.2. Off-skid Fuel Inlet Block Valve

The block valve (XV75) provides system isolation on shutdown or when gas fuel is selected. The block valve is controlled by a pneumatically operated rotary actuator and the instrument air supply to the actuator is controlled by pilot solenoid (SOL15).

The block valve is designed to fail in the closed position.

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3.4.3. Selector Valve, Purge/Fuel Supply to Burners

This assembly consists of two ball valves (XV423A, XV423B) ganged together and operated by a single solenoid (SOL618) operated vane type actuator with spring return.

When the gas turbine is running on liquid fuel, the solenoid (SOL618) is energized to direct instrument air to the rotary actuator to open the ball valves (XV423A, XV423B) which are located in the pilot and main liquid fuel lines.

In the de-energised condition the fuel supply is shut off and the burners are connected directly to the drain / purge system.

3.4.4. Liquid Fuel Filter Assembly

The high efficiency duplex low pressure filter (XF19 and XF98) conditions the incoming liquid fuel supply to the filtration level required for satisfactory system operation.

3.5. Purge System General Description Off-skid Components

i) heat exchanger, P2 purge supply (TH8) On-skid components

i) selector valve, purge/drain of liquid fuel burners (XV424) ii) selector valve, process/P2 air to burners (XV427)

iii) selector valve, process airpurge block and vent (XV127) iv) block valve, purge air supply to gas fuel pilot burner (XV148) v) block valve, P2 supply to gas fuel pilot burner (XV152)

vi) block valve, liquid fuel prime to drain tank (XV425A, XV425B) vii) purge air control valve (XV585)

3.5.1. Block Valve, Liquid Fuel Prime to Drain Tank

This assembly consists of two ball valves (XV425A, XV425B) ganged together and operated by a single vane type actuator with spring return. The actuator is actuated by a solenoid (SOL620) operated exhaust valve (XV459).

In the de-energised position the valves are open to recirculate metered fuel (pilot and main) from the burner supply to the drain tank or to the customer’s tank (via diverting hand valve (HV1000) when applicable.

In the energised condition the valves are closed and recirculating fuel is shut off.

3.5.2. Selector Valve, Purge / Drain of Liquid Fuel Burners

This assembly consists of a ball valve (XV424) operated by a solenoid (SOL619) operated vane type actuator with spring return.

The valve connects the burners to either drain or purge supply.

In the de-energised condition purge supply is shut off and the common port is connected to drain.

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1-3-5 rw_ops_1_3_dual_140912.doc

3.5.3. Purge Air Control Valve

This assembly consists of a ball valve (XV585) and actuator operated via an electrically actuated positioner (ZY32).

The valve controls both process air and cooled P2 purge flow to the liquid pilot burner air assist passages.

The actuator is opened with an increasing 4-20mA demand signal and closed with a reducing signal.

3.5.4. Selector Valve, P2 Air to Burners

The valve enables automatic selection of process air or cooled P2 purge flow to the burners.

3.5.5. Selector Valve, Process Air Purge Block / Vent

The valve enables automatic isolation of the process purge air when required.

3.5.6. Block Valve, Process Purge Air Supply to Gas Fuel Pilot Burner

When energized this valve enables the flow of process purge air to the gas fuel pilot burner. In the de-energised condition the valve is closed.

3.5.7. Block Valve, P2 Purge Air Supply to Gas Fuel Pilot Burner

When energized this valve enables the flow of P2 purge air to the gas fuel pilot burner. In the de-energised condition the valve is closed.

3.5.8. P2 Purge Supply Heat Exchanger

A natural convection heat exchanger is located on the enclosure roof to provide cooling of the P2 air from the centre casing of the engine to a temperature suitable for use in the purge passageways and pipework of the fuel system.

3.6. Combustion Components 3.6.1. Fuel Burners

The burners incorporate main and pilot gas ports to introduce the correct proportion of fuel for the combustion process during starting and turbine operation.

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3.6.2. Igniter

An igniter (IG1 to IG6) is incorporated in each combuster flame tube to provide a heat source to the fuel during engine starting. The units are connected by high tension leads to a high-energy spark generator.

3.7. Instrumentation 3.7.1. Position Monitoring

Position switches (ZS12 and ZS45) monitors the open/closed position of the offskid block valve and switches (ZS44 and ZS11) monitor the open/closed position of the off-skid vent valve.

Position switches (ZS178 and ZS5) monitor the open/closed position of the primary on-skid block valve, switches (ZS207 and ZS208) monitor the open/closed position of the secondary on-skid block valve and switches (ZS742 and ZS743) monitor the open/closed position of the vent valve.

The switches initiate a start inhibit signal if the any of the valves are wrongly positioned prior to start.

3.7.2. Pressure Monitoring

Pressure transmitters (PT2A, PT2B, PT181A and PT181B) monitor the gas supply pressure at the input and the demand pressure at the output of the main gas fuel control valve respectively. The pressure differential across the valve is used in conjunction with the valve feedback position to calculate the approximate percentage fuel flow through the valve.

Pressure transmitters (PT220A, PT220B, PT182A and PT182B) monitor the gas supply pressure at the input and the demand pressure at the output of the pilot gas fuel control valve respectively. The pressure differential across the valve is used in conjunction with the valve feedback position to calculate the approximate percentage fuel flow through the valve.

Dynamic air pressure through the centre casing is monitored by a pressure transmitter (PT200).

3.7.3. Temperature Monitoring

A temperature transmitter (TT6) monitors the gas fuel supply temperature upstream of the gas fuel control valve(s). The transmitter relays temperature information to the ECU and programmable controller and provides low and high temperature shutdown signals.

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1

Gas Fuel System - Schematic Diagram

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rw_ops_1_3a_dual_140610.doc 1

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1

Tag No. Description Tag No. Description FG18 Sight Glass. Fuel Gas Coalescing

Filter (OPT) PT181A Pressure Transmitter, Fuel Gas Main Control Valve Outlet (Voting) FG19 Sight Glass. Fuel Gas Coalescing

Filter Vessel No2 (OPT) PT181B Pressure Transmitter, Fuel Gas Main Control Valve Outlet (Voting) FO109 Flow Restrictor. Coalescing Filter

Hydrocarbon Condensate Drain

(OPT) PT181C Pressure Transmitter. Secondary Fuel

Gas Control Valve Inlet (OPT) FO126 Flow Restrictor. Quick Exhaust Valve PT182A Pressure Transmitter, Fuel Gas Pilot

Control Valve Outlet (Voting) (OPT) FO127 Flow Restrictor. Quick Exhaust Valve PT182B Pressure Transmitter, Fuel Gas Pilot

Control Valve Outlet (Voting (OPT)) FO128 Flow Restrictor. PT182C Pressure Transmitter. Secondary Pilot

Fuel Gas Control Valve Outlet (OPT) FT1 Flow Transmitter, Fuel Gas Inlet

(OPT) PT220A Pressure Transmitter, Fuel Gas Pilot

Control Valve Inlet (Voting) (OPT) HV31 Manual Shut-off Valve, Gas Fuel

Supply PT220B Pressure Transmitter, Fuel Gas Pilot

Control Valve Inlet (Voting) (OPT) HV550 Combined Isolating and

Vent/calibrating Valve (OPT) TT6 Temperature Transmitter, Fuel Gas Supply

HV551 Combined Isolating and

Vent/calibrating Valve (OPT) TT6C Temperature Transmitter, Fuel Gas Supply (OPT)

Vent/calibrating Valve (OPT) SOL5 Solenoid Valve. Pilot For Fuel Gas Block Valve

Vent/calibrating Valv (OPT)e SOL11 Solenoid Valve. Pilot For Off Skid Fuel Gas Vent Valve

HV672 Combined Isolating &

Vent/Calibrating Valve (OPT) SOL12 Solenoid Valve. Pilot For Off Skid Fuel Gas Block Valve

HV673 Hand Valve. Coalescing Filter Hydrocarbon Condensate Drain

(OPT) SOL110 Solenoid Valve. Pilot For Fuel Gas

Block Valve

HV674 Hand Valve. Coalescing Filter Hydrocarbon Condensate Drain

(OPT) SOL470 Solenoid Valve. Pilot For Main Gas

Vent Valve Assembly (OPT) HV677 Hand Valve. Flow Transmitter By-

Pass (OPT) XF94 Strainer, Fuel Gas Supply

HV678 Isolation Valve. Flow Transmitter

(OPT) XF97 Coalescer/Filter Element. Fuel Gas Off

Skid Vessel No1 (OPT) HV679 Isolation Valve. Flow Transmitter

(OPT) XF204 Coalescer/Filter Element. Fuel Gas Off

Skid Vessel No2 (OPT) HV680 Combined Isolating &

Vent/Calibrating Valve. Pressure

Differential Indicator (OPT) XM26 Actuator, Main Fuel Gas Control Valve

Vent/Calibrating Valve (OPT) XM27 Actuator, Pilot Fuel Gas Control Valve (OPT)

Vent/Calibrating Valve (OPT) XV6 Block Valve, Fuel Gas Secondary Block Valve

HV1015 Block Valve. Fuel Gas Coalescing

Filter Upstream (OPT) XV7 Block Valve, Fuel Gas Primary Block Valve

HV1016 Block Valve. Fuel Gas Coalescing

Filter Downstream (OPT) XV30 Block Valve, Fuel Gas Off-skid HV1017A Block Valve. Gas Coalescing Filter Upstream (OPT) XV31 Vent Valve, Fuel Gas Off-skid HV1017B Block Valve. Gas Coalescing Filter Upstream (OPT) XV149 Control Valve, Pilot Fuel Gas (OPT) HV1018 Vent Valve. Gas Coalescing Filter

(OPT) XV150 Control Valve, Main Fuel Gas

HV1019A Block Valve. Gas Coalescing Filter Downstream (OPT) XV212 Vent Valve, Fuel Gas (OPT) HV1019B Block Valve. Gas Coalescing Filter Downstream (OPT) XV463 Quick Exhaust Valve

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rw_ops_1_3a_dual_140610.doc 1 Tag No. Description Tag No. Description

HV1020 Vent Valve. Gas Coalescing Filter

(OPT) XV464 Quick Exhaust Valve

HV1021A Block Valve. Gas Coalescing Filter Upstream (OPT) XV616A Valve HV1021B Block Valve. Gas Coalescing Filter Upstream (OPT) XV616B Valve HV1022 Vent Valve. Gas Coalescing Filter

(OPT) XV616C Valve (OPT)

HV1023A Block Valve. Gas Coalescing Filter Downstream (OPT) XX5 Coalescer/Filter Vessel. Fuel Gas Off Skid (OPT)

HV1023B Block Valve. Gas Coalescing Filter Downstream (OPT) XX66 Coalescer/Filter Vessel No2. Fuel Gas Off Skid (OPT)

HV1024 Vent Valve. Gas Coalescing Filter

(OPT) ZC12 Position Control. Main Fuel Gas

Control Valve HV1025 Hand Valve. Gas Coalescing Filter

Vessel No2 Condensate Drain

(OPT) ZC13 Position Control. Pilot Fuel Gas Control

Valve (OPT)

HV1026 Hand Valve. Gas Coalescing Filter Vessel No2 Condensate Drain

(OPT) ZS5 Position Switch, Fuel Gas Primary

Block Valve Closed LD103 Level Detector. Fuel Gas Coalescing

Filter (OPT) ZS11 Position Switch, Off-skid Fuel Gas Vent Valve Closed

LD104 Level Detector. Fuel Gas Coalescing

Filter (OPT) ZS12 Position Switch, Off-skid Fuel Gas

Block Valve Open PDI107 Pressure Differential Indicator. Fuel

Gas Coalescing Filter (OPT) ZS44 Position Switch, Off-skid Fuel Gas Vent Valve Open

PDT140 Pressure Differential Transmitter.

Fuel Gas Coalescing Filter (OPT) ZS45 Position Switch, Off-skid Fuel Gas Block Valve Closed

PI16 Pressure Gauge. Fuel Gas Control

Valve Inlet (OPT) ZS178 Position Switch, Fuel Gas Primary Block Valve Open

PI203 Pressure Gauge. Gas Coalescing

Filter (OPT) ZS207 Position Switch, Fuel Gas Secondary

Block Valve Open PI204 Pressure Gauge. Gas Coalescing

Filter (OPT) ZS208 Position Switch, Fuel Gas Secondary

Block Valve Closed PT2A Pressure Transmitter, Fuel Gas Main

Control Valve Inlet (Voting) ZS742 Position Switch, Fuel Gas Vent Valve Open (OPT)

PT2B Pressure Transmitter, Fuel Gas Main

Control Valve Inlet (Voting) ZS743 Position Switch, Fuel Gas Vent Valve Closed (OPT)

PT2C Pressure Transmitter. Secondary

Fuel Gas Control Valve Inlet (OPT) ZT12 Position Transmitter, Main Fuel Gas Control Valve

ZT103 Position Transmitter, Pilot Fuel Gas Control Valve (OPT)

Key to Gas Fuel System Schematic Diagram

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1

Liquid Fuel System - Schematic Diagram

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1

Tag No. Description Tag No. Description

FI28 Flow Indicator, Fuel Filter, Drain XF179 Filter, P2 Condensate, Drain FLX1 Flexible Pipe, Main Gas fuel, Supply XF235 Filter. Air Supply to XV585

FLX2 Flexible Pipe, Pilot Gas fuel ,Supply XM5 AC Electric Motor, Liquid Fuel Pump Drive

FLX111 Flexible Pipe, Liquid Fuel Filter Priming

Line XP36 Pump, Liquid Fuel, Main

FLX112 Flexible Pipe, Liquid Fuel Filter Priming

Line XP37 Pump, Liquid Fuel, Pilot

FLX113 Flexible Pipe, Liquid Fuel Filters to

Metering Unit XV75 Block Valve, Off-skid Liquid Fuel

Isolation

FLX178 Flexible Pipe. Instrument Air To XV585 XV147 Selector Valve, Process Air Purge Block/Vent

FO41 Flow Restrictor, Process Air to Gas Fuel

Pilot XV148 Block Valve, Purge Supply to Gas Fuel

Burner

FO95 Flow Restrictor, Liquid Fuel Main Line XV152 Block Valve, P2 Supply to Gas Fuel Burner

FO96 Flow Restrictor, Liquid Fuel Pilot Line XV213 Flow Control Valve, Liquid Fuel Pilot FO105 Flow Restrictor, P2 Condensate Drain

after Cooler XV214 Flow Control Valve, Liquid Fuel Main FO121 Flow Restrictor, Differential Sensing

Liquid Fuel Main XV373 Non Return Valve, Process Air Supply to Liquid Fuel Module

FO123 Flow Restrictor, Differential Sensing

Liquid Fuel Pilot XV388 Block Valve. Ignition / Purge Gas FO136 Flow Restrictor, Exhaust Valve (SOL15) XV423A Selector Valve, Purge/ Fuel Supply to

Liquid Fuel Pilot Burner FO141 Flow Restrictor, P2 Purge Supply to Gas

Fuel Pilot XV423B Selector Valve, Purge/ Fuel Supply to Liquid Fuel Main Burner

FT3 Flow Transmitter. Liquid Fuel Supply

(OPT) XV424 Selector Valve, Purge/ Drain of Liquid

Fuel Burners HS27 Local Stop Pushbutton, Liquid Fuel

Pump Motor XV425A Block Valve, Liquid Fuel Main Prime to Drain Tank

HV39 Hand Valve, Liquid Fuel Skid Isolation XV425B Block Valve, Liquid Fuel Pilot Prime to Drain Tank

HV42 Combined Isolating and Vent/ Calibrating

Valve XV427 Selector Valve, Process or P2 Air to

Burners HV43 Combined Isolating and Vent/ Calibrating

Valve XV455 Pressure Compensator, Liquid Fuel

Main HV152 Combined Isolating & Vent/Calibrating

Valve (OPT) XV456 Pressure Compensator, Liquid Fuel

Pilot HV224 Combined Isolating and Vent/ Calibrating

Valve XV457 Non Return Valve. Priming Line

HV225 Changeover Valve, Liquid Fuel Filter XV459 Quick Exhaust Valve HV231 Combined Isolating and Vent/ Calibrating

Valve XV501A Non Return Valve, Instrument Air to

SOL619

HV554 Hand Valve, Liquid Fuel Filter Vent XV501B Non Return Valve, Instrument Air to SOL618

HV555 Hand Valve, Liquid Fuel Filter Drain XV501C Non Return Valve, Instrument Air to PCV160 Positioner

HV557 Hand Valve, Liquid Fuel Filter Vent XV501D Non Return Valve, Instrument Air to SOL350

HV558 Hand Valve, Liquid Fuel Filter Drain XV501E Non Return Valve, Instrument Air to SOL620

HV559 Hand Valve, Liquid Fuel Filter Fill Valve XV501F Non Return Valve, Instrument Air to SOL622

HV560 Combined Isolating and Vent/ Calibrating

Valve XV501G Non Return Valve, Instrument Air to

SOL351

HV1000 Hand Valve, Liquid Fuel Prime, Diverter XV501H Non Return Valve. Instrument Air To SOL1

HV1004 Hand Valve. Flow Transmitter By-Pass

(OPT) XV501J Non Return Valve, Instrument Air to

SOL172

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rw_ops_1_3b_liquid_140623.doc 1 Tag No. Description Tag No. Description

HV1005 Isolation Valve. Flow Transmitter (OPT) XV585 Purge Air Control Valve, Air Assist HV1006 Isolation Valve. Flow Transmitter (OPT) XV586 Non Return Valve, Main Liquid Fuel

Supply

MCC2 Motor Control Centre XV587 Non Return Valve, Pilot Liquid Fuel Supply

PDI2 Pressure Differential Indicator XV638 Quick Exhaust Valve PDT6 Differential Pressure Transmitter, Liquid

Fuel Filter ZC2 Pilot Fuel Flow Valve Demand

PI14 Pressure Gauge. Liquid Fuel Supply

(OPT) ZC20 Main Fuel Flow Valve Demand

PSV167 Pressure Relief Valve. Liquid Fuel Filter

Thermal Relief. ZC46 Position Drive Signal, Purge Air Control Valve

PSV168 Pressure Relief Valve. Liquid Fuel Filter

Thermal Relief. ZS10 Position Switch, Liquid Fuel Offskid Block Valve, Valve Fully Closed PSV169 Pressure Relief Valve, Liquid Fuel Main ZS15 Position Switch, Liquid Fuel Offskid

Block Valve, Valve Fully Open

PSV170 Pressure Relief Valve, Liquid Fuel Pilot ZS382 Position Switch, P2 Supply to Gas Fuel Pilot Burner Block Valve, Fully Open PSV171 Pressure Relief Valve, Liquid Fuel Main ZS383 Position Switch, P2 Supply to Gas Fuel

Pilot Burner Block Valve, Fully Closed PSV172 Pressure Relief Valve, Liquid Fuel Pilot ZS926 Position Switch. Ignition / Purge Gas

Block Valve. Closed

PT10 Pressure Transmitter, Liquid Fuel Supply ZS927 Position Switch. Ignition / Purge Gas Block Valve. Open

PT238 Pressure Transmitter, Purge Supply to

Air Assist ZS979 Position Switch, Purge/Fuel Supply to

Burner Selector Valve, De-energised State

PT279 Pressure Transmitter, Liquid Fuel Pilot

Supply to Burner ZS980 Position Switch, Purge/Fuel Supply to Burner Selector Valve, Energised State PT351 Pressure Transmitter, Liquid Fuel main

Supply to Burner ZS981 Position Switch, Purge/Drain of Liquid Fuel Burners Selector Valve, De- energised State

SOL1 Solenoid Valve. Ignition / Purge Gas

Block Valve. ZS982 Position Switch, Purge/Drain of Liquid Fuel Burners Selector Valve, Energised State

SOL15 Solenoid Valve, Off-skid Liquid Fuel

Isolation Valve ZS983 Position Switch, Liquid Fuel Prime to Drain Tank Block Valves, Valve Fully Closed

SOL172 Solenoid Valve, P2 Supply to Gas Fuel

Pilot Burner ZS984 Position Switch, Liquid Fuel Prime to Drain Tank Block Valves, Valve Fully Open

SOL350 Solenoid Valve, Process Air Purge

Block/Vent ZS987 Position Switch, Process or P2 Air to Burners Selector Valve, De-energised State

SOL351 Solenoid Valve, Purge Supply to Gas

Fuel Burner ZS988 Position Switch, Process or P2 Air to Burners Selector Valve, Energised State

SOL618 Solenoid Valve, Purge/Fuel Supply to

Liquid Burners ZS989 Position Switch, Process Air Purge Block/Vent Selector Valve, De- energised State

SOL619 Solenoid Valve, Purge/Drain of Liquid

Burners ZS990 Position Switch, Process Air Purge

Block/Vent Selector Valve, Energised State

SOL620 Solenoid Valve, Liquid Fuel Prime to

Drain Tank ZS991 Position Switch, Purge Supply to Gas

Fuel Pilot Burner Block Valve, Valve Fully Closed

SOL622 Solenoid Valve, Process or P2 Air to

Burners ZS992 Position Switch, Purge Supply to Gas

Fuel Pilot Burner Block Valve, Valve Fully Open

TH8 Heat Exchanger, P2 Purge Supply ZT13 Main Fuel Flow Valve Feedback

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1

Tag No. Description Tag No. Description TT133 Temperature Transmitter, P2 Cooler

Discharge Temperature ZT108 Pilot Fuel Flow Valve Feedback XF19 Filter, Liquid Fuel Main ZT165 Position Transmitter, Purge Air Control

Valve

XF98 Filter, Liquid Fuel Standby ZY32 Position Convertor, Purge Air Control Valve

XF103 Filter, P2 Purge Supply to Engine XF176 Filter. Propane Supply To Gas Fuel Pilot

Burner (OPT)

Key to Liquid Fuel Fuel System Schematic Diagram