bp fpso ff application - fieldbus foundation · fieldbus on fpso nola ogar bp exploration operating...

Foundation Fieldbus Seminar Singapore & MalaysiaAugust 20091

Fieldbus FoundationTM

An Owner’s perspective on Foundation Fieldbus on FPSO

Nola OgarBP Exploration Operating CO. Ltd.

On behalf ofFieldbus Foundation TM marketing Society (Singapore)


PSVM (Plutao, Saturno, Venus and Marte) development by BP in Angola’s offshore Block 31 oilfield

The developments is based on clustered subsea production wells, 2000 m water depth, tied-back to an external turret moored converted FPSO.

The topsides comprises of process modules for fluid reception, separation, treatment, dehydration, metering and export of the crude oil to export tankers. Utilities modules will be provided for power generation, air compression, etc, and an accommodation module will be located towards the stern of the vessel.

The accommodation module will include a Central Control Room (CCR), for control and monitoring of the overall facility


Integrated, Control and Safety System

The ICSS includes Yokogawa CENTUM® VP Integrated Production Control System, ProSafe®-RS Safety Instrumented System and ExaquantumTM integrated information system.

The ICSS will provide fully integrated and seamless control and safety functions for the subsea, marine, hull, and topside facilities of the FPSO.

The ICSS provides a single interface for operators to start, control, and monitor all facilities from a central control room.

The project fully leverages the potential benefits of FOUNDATION™ fieldbus technology.


Integrated Control and Safety Systems Equipment Location

TURRET

FORWARD LER (FLER)

E-House

CCR & LQ LER

Engine Room


Foundation TM Fieldbus Design

Fieldbus Intrinsically Safe Concept (FISCO)– Highest levels of operational safety in hazardous

areas– Fully live-workable IS circuits throughout the

FOUNDATION FieldbusTM field networkPerformance and online diagnostics.Control in the field device (valve)Pre-assembled FF Junction Boxes containing MTL-Relcom FISCO Megablocks for 12 devices.Surge protection for the network trunk. Spur short-circuit protection is already accommodated within the Megablock wiring hub.


Foundation Fieldbus ‘H1’: 31,25kb/s

FF DCS

Fieldbus power conditioner

Field WiringHub

Zone/Division 2

Zone/Division 1FOUNDATION Fieldbus Devices

24Vdc

FOUNDATIONFieldbus H1 network

Safe areaSafe area

FIELD

CONTROL ROOM

I

t

IB = 10 mA

19 mA

1 mA

1 Bit

Bits: 1 0 1 1 0


FISCO Design

FISCO as defined by IEC standard 60079-27FISCO power supplies – Redundant power supply configuration for high system availability– Integrated connections to redundant Yokogawa ALF111 FOUNDATION

fieldbus™ H1 communication modulesFF field devices FISCO approved– Must not provide power to the bus (passive)– Iin ≥ 10mA, ensures device is passive at +/- 9mA– Li ≤10µH, Ci ≤ 5nF (internal inductance and capacitance is negligible)

Standardized Ex parameters (U: 17.5V; I: 380mA; P: 5.32W)Defined cable parameters(Rc=15 … 150 Ω/km, Lc=0,4 … 1 mH/ km, Cc=45 … 200 nF/km)(Note: Typical Fieldbus cable has 44ohms/km, 0.8mH/km and 120nF/km)Limited total cable length (trunk + all spurs)Spur length max. 60m


Energy limited trunk - Principles

• The bulk power is connected to a Entity/FISCO power supply

• The Entity/FISCO power supply provides energy-limited power to the field devices

• The fieldbus communication signal is superimposed on the power


FISCO TYPICAL INSTALLATION

FISCO power supply

FIELD

CONTROL ROOM

Intrinsically Safe Field wiring hub

Intrinsically safe FISCO Fieldbus devices

Zone 1Division 1

24Vdc24Vdc

Fieldbus control system (DCS)

Redundant 24V bulk power input

Live-workable spurs

Live-workable trunk


Redundant FISCO 4-segment carrier

– Redundant FISCO power supplies per segment

– 4 segments per carrier– Connections for redundant

ALF111 H1 host interface cards via AKB336 cables

– Redundant 24V dc bulk power inputs

– Alarm output (to Digital Input card)

– Robust, panel-mount construction

Segment 1

A

B


4-segment power supply carrier

ALF111 A ALF111 B

Alarm 24V A 24V B

Seg 1 Seg 2 Seg 3 Seg 4


Intrinsically Safe: original Entity model

• In IS Fieldbus applications the Intrinsic Safety must be verified (IEC 60079-14)

L0 C0

U0 I0 P0

R‘ L‘ C‘

Ui1 Ii1 Pi1

Ui2 Ii2 Pi2Ci1 Li1

Ci2 Li2

Ui > U0

Ii > I0Pi > P0

C0 > Ci1 + Ci2 + CcableL0 > Li1 + Li2 + Lcable

Ccable < C0 – ∑ CiLcable < L0 - ∑ Li

FBT1-IS

Safe Area

Zone 1 / Div1Hazardous Area


Intrinsically Safe: original Entity model

• Entity• Verification of intrinsic safety according to IEC

60079-14– U, I, P, C, L

• Cable parameters (CC, LC) are to be considered• Instrument capacitance (Ci) and inductance (Li)

not negligible• Increasing cable length means new I.S.

calculation• Adding a field device means new I.S. calculation• Different field devices have different Ci and Li → devices not interchangeable

• Risk of incorrect/no verification


Intrinsically Safe: FISCO model


Connecting ‘Entity’ devices to FISCO


Typical Segment Calculation: 12 devices


Advantages of FISCO

International Standard IEC 60079-27: 2005High reliabilityUp to 16 instruments (limited by host, power

and macrocycle)Most economic concept for any number of

instruments Verification of intrinsic safety documented by FISCO

Trunk and Spurs are intrinsically safeNo change in maintenance procedures

compared to 4-20 mANo mix of protection methodsLowest risk of explosion


Business Case


Business Case cont..

Intrinsically Safe DesignIncreased production up-time

•Fully utilises the digital medium•Performance enhancing diagnostics•Simple device health checks•Less downtime – Higher production

Reduced Maintenance Costs •Prioritises alarms and automatic notification•Simplifies device recognition and replacement•Remote maintenance available•Reduced trip to the site and fieldwork

Reduce human risk through minimizing field visitsLower CAPEX and OPEXTotal Cost of Ownership Reduction


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bp fpso ff application - fieldbus foundation · fieldbus on fpso nola ogar bp exploration operating...

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