2.5-Fuel Oil Discription

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MAPNA GROUP Co.(Private Joint Stock) Company Code :IRAN POWER PLANT PROJECTS MANAGEMENT

ISSUED BY :

MAPNA TS S ENGINEERING DEPUTY

Tech. Spec. Code:

2.5. FUEL OIL SYSTEM

DESCRIPTION

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0 The First Issue

Rev. Description Prepared Date Checked Date Approved Date

Prepared by: Date MAR.2009

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CONTENTS:

Item No. Title1 System Description1.1 Fuel oil system description1.2 Design criteria1.3 Codes and standards

1.1 FUEL OIL SUPPLY SYSTEM

1.1.1 Fuel Oil System General Requirements


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The liquid fuel supply system shall be as shown in P & ID No. IPP/ AL -00

/BP-M-02-FG0-001(6sheets) and shall fulfill the following requirements:

- Supply of liquid fuel to the gas turbines.-Supply of liquid fuel to the new emergency diesel generators

-Supply of liquid fuel to the new diesel driven fire pump-Supply of liquid fuel to the new HVAC building

The fuel oil system shall be designed in accordance with NFPA

1.1.2 Function

The function of the system is supply fuel oil for 2 gas turbines and the auxiliaryequipment such as the fire diesel pump and the emergency diesel generator withthe specified requirements. Fuel oil shall be utilized as a back up fuel, whennatural gas is not available for gas turbines . Fuel oil shall be stored in 4 verticaltanks with a holding capacity of 20,000 m for each tank.

1.1.3Fuel oil unloading system (EXISTING(

Unloading from fuel oil tankers performs at existing 6 unloading bays at a

rate of 40 m3/hr from each tanker and from there the fuel flows by gravity tothe underground steel reservoir tank with capacity 100 m. Loading of new fueloil storage tanks shall be performed by 2 unloading pumps each of capacity150 m/hr AND 40 m head.

All Connection to the road tankers are existing with 2 1/2 hosesequipped with quick coupling connectors.

The unloading pump sets deliver the fuel oil to the 4 existing 20000 m3storage tanks and also new three storage tanks. Start / Stop of pumpsshall be manual, auto stop is foreseen in case of low level ofunderground tank, or high level of storage tanks. The fuel oil beingloaded in fuel oil storage tanks shall be metered by means of a flowmeter installed at the unloading pump discharge line.

1.1.4 Fuel oil Storage tanks (EXISTING)

At Ardebil power plant there are 2x 20000 m3 storage tanks and forextension Four (4) storage tanks with a capacity of 20,000 m each shall beprovided for the gas oil.


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Each tank is vertical, cylindrical, fixed supported cone roof type and equipped

with siphon type inlet. The tanks shall be located in the dike. The dike shallhave sufficient capacity to hold oil equal to one tank capacity. The tanks areprovided with vents to allow for the escape of vapors during temperature rises.There is over flow for each tank. The tanks are equipped with draw off sumpsfor drain of each tank. (In storage tanks portion there are no any action for thiscontract.(

1.1.5 Fuel oil daily tanks (EXTENSION PROJECT)

Three separate daily tanks are considered for new emergency diesel

generator , new fire fighting diesel pump and also new HVAC building.

Supplying fuel oil to the these buildings are indicated in the doc. :TSM/AD-00/BP-M-FR3-182

1.1.6 Forwarding Pumps

Two (2x100%) forwarding pumps shall be provided for each gas

turbine and 1x100% duplex filter with capacity 65 m/hr.

The forwarding pumps shall draw oil from the storage tanks via a commonsuction header with suction branches to each forwarding pump skid.The low points of the interconnecting pipe work to the forwarding pump skidshall incorporate a drain valve. Similarly, all high points shall incorporate avent valve.

In the inlet of each forwarding pump a duplex type filter is installed. In order toclean one of the filters the manual changeover valve is included so that achangeover may be performed without interruption of operations. The

differential pressure across the operational filter and therefore the degree ofclogging is indicated locally by the differential pressure gauge.If the differential pressure over-runs the pre-determine value then thedifferential pressure switch raises an alarm signal in CCR to indicate that achangeover is required.The filter chambers can be vented through the valves to prevent any overpressure due to thermal expansion when the section is isolated.


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The skid outlet pressure is indicated locally by pressure gauges. Moreover low

pressure signal of pumps discharge, detected by pressure switches, shall besend to GT control system for auto change over of pumps.For filling the 3 new daily tanks it is necessary to branch off from existing headerof auxiliary fuel pumps and routed to the buildings.

1.1.7 Pressure holder (accumulator)

For each gas turbine unit, an oil accumulator shall be provided to maintain fueloil pressure within acceptable limit at the suction of injection pump during thetransient period when the running forwarding pump trips and the stand bypump is yet to come into operation.

No:2 , V=400 lit. .

1.1.8 Fuel Oil Return Line

Fuel oil return lines (two lines from each gas turbine) shall be routed to thestorage talks as shown in the P & ID.

A three-way motor operated valve shall be provided on the dischargeline of the GT fuel pumps of each unit to return fuel from turbine hall.These valves shall be located in turbine hall and are controlled by

means of GT control.

1.1.9 Vents and Drains

All skid internal vents and drains are piped to the sump drain tank integrated inthe skid base frame. The arrangement of the relief valves shall be such thatultimately the discharged oil shall be relieved into a tank.

1.1.10 Instrumentation and control

Instrumentation shall be designed to allow for a coordinated and safeoperation of the tanker unloading system, storage of the oil and forwarding itto the various consumers.

Analogue and binary signals shall be used for monitoring the operation of thesystem.

A conventional control panel (for 7 storage tanks the four existing ones andthe three extension tanks) shall be foreseen in the unloading pump house for


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control and monitoring fuel unloading system. (This panel will replace the old

existing panel which controls 4 existing storage tanks.)Control and monitoring of fuel oil forwarding pumps to GTGs and three-waymotor operating valves will be carried out by GT control system from GTslocal control rooms and Central Control Room.

Interface signals from storage tanks and forwarding system shall be gatheredon a marshalling panel which shall be located in the switch gear room of theforwarding pump house.

One control panel shall be foreseen in the switch gear room of forwardingpump house for control and monitoring of forwarding pumps to Auxiliaries.Monitoring of fuel oil tanks level and temperature shall also be provided onthis panel. (one such panel already exists for the 4 existing storage tanks Indications of the new 3 tanks shall be added to the panel if possible-otherwise it should be replaced with new panel.)

Control of the 3 steam motorized continuous control valves for heating of the3 extension storage tanks shall be considered in control panels/mcc in theunloading or forwarding pump house.

If a PLC would be provided for fuel oil common control system, it shall beconformed to PLC's technical specification in this contract. Also PLCshall be provided from the same manufacturer for whole used PLC's inBOP.

All field transmitters and switches shall have an ingress protection classof IP65. Field instruments shall be selected to fulfil standardrequirements in according to the hazardous area classification document.

For more technical specifications of PLC, field instrument and I&C cablesrefer to the relevant documents in this contract.

The basic functions of the instrumentation culminate in the following:

- Start and stop of the unloading pumps.

- Meter the delivered oil volume to the plant

- Monitor the function of the filters- Monitor and control the level in the fuel oil underground tank and

storage tanks

- Start and stop of the forwarding pumps to GTGs (from GTs controlrooms/containers and Central Control Room)

- Control of three-way MOVs from GTs control room and CentralControl Room)

- Monitor of temperature in the storage tanks


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- Monitoring different valves position in the tank yard according to

the pattern selected on the unloading control panel.-

1.1.11 Electrical

Complete electrical system and accessories within the

battery limit including:

- LV motors for fuel system

- Local control box for LV motors- Motor control center and power distribution panels and

accessories (2 cells withdrawable type add to pervious MCC )

- All protection and measuring equipment panel and accessories

- Indoor Cable trays, race way and conduits wherever necessary

- Power & control cables

- Complete heat tracing system for oil pipes, including power

- distribution board and temperature control cabinet andaccessories

- Secondary earthing system- All other accessories necessary to make the system complete

- Heat tracing for fuel system

1.2 Design criteria

1) System data

Valves and piping:

Design pressure: 10 bar (g)Design temperature: +50 C

min.: -30 C

1.3Codes & standard


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This system shall be designed and constructed to the applicablerequirements of the following codes and standard or equivalent international

codes:

ASME: American Society of Mechanical EngineersANSI: American National Standards InstituteASTM: American Society for Testing and MaterialEPA: Environmental Protection AgencySSPC: Steel Structures Painting CouncilAWS: American Welding SocietyApplicable DIN standards

BS: Applicable British Standards


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ORUMIEHSITE CONDITION

1313mElevation

37CMaximum absolute temperature

-20CMinimum absolute temperature

92%Maximum relative humidity

27%Minimum relative humidity

60%Average yearly relative humidity

331.7mmAnnual precipitation

2.5-Fuel Oil Discription

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