Nº

TECHNICAL SPECIFICATION I-ET-3010.00-5529-854-PAZ-005

CLIENT: PAGE
PETROBRAS E&P 1 OF 15
PROGRAM:

AREA:
FLOATING PRODUCTION UNITS
TITLE:

DDP&T/SUB/ES/DCT
MODA RISER MONITORING SYSTEM – NP-1
FPSO SCOPE DDP&T/SUB/ES/DCT

REVISION INDEX

REV. DESCRIPTION AND/OR REVISED PAGES

0 ORIGINAL

A UPDATES ON MODA CABINET NETWORK CONNECTION, FBG INTERROGATOR

SPECIFICATION, NETWORK SWITCH SPECIFICATION, SPLICE BOX SPECIFICATION
AND SOME FIGURES. MAJOR CHANGES ARE HIGHLIGHTED IN GREY.

REV. 0 REV. A REV. B REV. C REV. D REV. E

DATE 16-JUN-2015 14-SET-2016

DESIGN E&P-CORP/EEPIP/ES DDP&T/SUB/ES/DCT

EXECUTION B. SANTIAGO B. SANTIAGO

E. TOSI E. TOSI
CHECK
S. MORIKAWA S. MORIKAWA
APPROVAL A. FRANÇA A. FRANÇA
THIS DOCUMENT IS PETROBRAS PROPERTY AND MAY NOT BE USED FOR PURPOSES OTHER THAN THOSE SPECIFICALLY INDICATED HEREIN.
HIS FORM IS PART OF PETROBRAS STANDARD N-381 REV. L.
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MODA RISER MONITORING SYSTEM – NP-1
FPSO SCOPE DDP&T/SUB/ES/DCT

INDEX SUMMARY

1. Introduction 3
1.1. Objective 3
1.2. References 3
1.3. Acronyms 3
1.4. Definitions 3
2. MODA System Overview 4
3. FPSO Scope 7
3.1. MODA System Layout 7
3.2. MODA Cabinet(s) 8
3.3. MODA Cabinet(s) Equipments and Accessories 9
3.3.1 FBG Interrogators 9
3.3.2 Server Computers 10
3.3.3 Network Switch(es) 10
3.3.4 KVM Console 11
3.3.5 Fiber Patch Panels 11
3.3.6 Optical Pigtails 11
3.3.7 FBG Sensor Array 11
3.4. Cabinet Optical Cables 11
3.5. Splice Boxes 12
3.6. Trays for the Riser Optical Cable 13
3.7. Inspection and Testing 13
4. Review of the FPSO Scope 13
5. Review of Information to be exchanged with PETROBRAS 14
5.1. Information defined on PARENT DOCUMENT 14
5.2. Detailed design 14
5.3. Inspection and Testing 15
5.4. Databook 15
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MODA RISER MONITORING SYSTEM – NP-1
FPSO SCOPE DDP&T/SUB/ES/DCT

1. Introduction
1.1. Objective

The objective of this document is to describe the MODA riser monitoring system, define the scope
of the MODA System in the FPSO contract and identify the FPSO interfaces with other parts of
the MODA System.

1.2. References

[1] Patent EP2489824A2 Scuttle for the monitoring and inspection of a flexible riser.
[2] IEC 60079-28 Explosive atmospheres - Part 28: Protection of equipment and transmission
systems using optical radiation.
[3] ITU-T G.652 Characteristics of a single-mode optical fibre and cable.
[4] ITU-T G.654 Characteristics of a cut-off shifted single-mode optical fibre and cable.

1.3. Acronyms
APC Angle Polished Connector

FBG Fiber Bragg Grating

FPSO Floating Production, Storage and Offloading.

MODA Monitoramento Óptico Direto no Arame (Optical Monitoring Directly on the Wire).
LSZH Low Smoke Zero Halogen.

1.4. Definitions

FPSO CONTRACTOR The Company contracted to supply the FPSO or the topside part of the
FPSO.
FPSO OPERATOR The Company that operates the FPSO, which may be the FPSO
CONTRACTOR, PETROBRAS or a third company.
RISER CONTRACTOR The Company contracted to supply flexible risers.
PETROBRAS Oil operator that uses the MODA system for riser integrity management. Any
information to be exchanged with PETROBRAS shall be addressed to the
subsea engineering group.
PARENT DOCUMENT FPSO GTD, FPSO Subsea Interface Document, Material Requisition, or
similar document that includes this technical specification in the scope of the
FPSO CONTRACTOR.
Cabinet Optical Cable Optical cable between the MODA Cabinet and a splice box in the riser deck.
Riser Optical Cable Optical cable between the riser and a splice box in the riser deck. It is a
short optical cable with a submersible dry-mate optical connector pre-
installed on one end and a length of unterminated cable at the other end.
Splice Box Weatherproof encasement that envelops the exposed area between spliced
cables and protect the exposed fibers from mechanical damage.
Spyhole End Fitting End fitting for flexible risers/jumpers with scuttles for inspection and
installation of monitoring systems.
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FPSO SCOPE DDP&T/SUB/ES/DCT

2. MODA System Overview

PETROBRAS’ MODA system uses optical sensors based on Fiber Bragg Grating (FBG)
technology to measure strains in the outer wire layer of flexible risers/jumpers, in order to identify
broken wires and detect events related to wire ruptures. These optical fiber sensors are located on
the top region of the riser/jumper, within the Spyhole End Fitting [1], as illustrated in figure 1.

Figure 1 – Spyhole End Fitting with MODA sensors.

The flexible risers/jumpers are supplied to PETROBRAS by the RISER CONTRACTOR including
the sensors (installed inside the Spyhole end fitting), cable conduits, optical cables and a
submersible dry-mate optical connector mounted at the shoulder of the end fitting body.
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The RISER CONTRACTOR also supplies to PETROBRAS the Riser Optical Cable, which is a 10
meter optical cable piece (with 8 single mode optical fibers) attached in one of it ends to the
submersible dry-mate optical connector (male part). The other end is supplied unterminated, for
further splicing and installation on a splice box at the riser deck, as illustrated in figures 2 and 3.

Figure 2 – Riser Optical Cable Sketch.

Figure 3 – Riser Optical Cable Picture | Unterminated End Picture.

After the pull-in of each riser/jumper, PETROBRAS shall go on board the FPSO, connect the
Riser Optical Cable on the riser, lay it on previously installed cable tray, splice the fibers of this
cable with the fibers of a previously installed Cabinet Optical Cable and protect them on the
previously installed splice box. This previously installed optical cable runs from the riser deck
directly to the MODA Cabinet(s), located on non-classified and temperature controlled area, as
illustrated in figure 4.
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Figure 4 – Sketch of two risers connected to the MODA Cabinet

On the MODA Cabinet the optical cable is terminated on a fiber patch panel and the fibers are
connected to a FBG interrogators that reads the sensors installed on the risers. The data collected
by the FBG interrogators are processed on server computers installed on the MODA Cabinet and
transmitted onshore through PETROBRAS Networks, as illustrated in figure 5.

Figure 5 – MODA Cabinet Sketch (for several risers).

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The FBG Interrogator specified by Petrobras is an inherently safe optical radiation transmitting
equipment (Ex op is T4 Ga) as defined on the standard IEC 60079-28 [2], meaning the
interrogator shall be located and operated in a safe zone. However the passive components of the
system (optical cables, splices, splice boxes, optical connectors and FBG sensors) can be
installed and operated in Zone 0, 1 or 2 environments.
As the FBG Interrogator distance range capacity is within some thousand meters, there are no
severe limitations on the optical cable path for the MODA System. Other precautions shall be
taken in account such as careful observance to the optical cable handling/installation, proper
splicing and termination of the fibers.

3. FPSO Scope

The MODA System can be divided in two parts:

 The MODA sensors, located within the Spyhole End Fitting of each riser and the Riser Optical
Cables, both in the scope of the RISER CONTRACTOR;

 The MODA topside infra-structure, which is scope of the FPSO CONTRACTOR, and includes
cable trays, cabinet optical cables, splice boxes, cabinet(s) and MODA equipment (FBG
interrogators, server computers, network switch, KVM, patch panels).
Detailed design, installation, testing and commissioning of MODA topside infra-structure are in the
scope of the FPSO CONTRACTOR.
The MODA software is out of the scope of supply and shall be installed offshore by PETROBRAS.
The commissioning of the complete MODA system can only be executed offshore, after riser
installation and integration with the topside part of the MODA System. After each riser installation,
PETROBRAS and the FPSO OPERATOR shall collaborate to interconnect the Riser Optical
Cable in the splice box. The commissioning of the complete system, including risers’ FBG
sensors, submersible wet connectors and software is out of the scope of the FPSO
CONTRACTOR.
Any information to be exchanged with PETROBRAS shall be addressed to the subsea
engineering group.

3.1. MODA System Layout

The MODA system layout is closely related to the infra-structure for the MODA system, which is in
the scope of the FPSO CONTRACTOR. There are some layout possibilities and the FPSO
CONTRACTOR shall propose a layout and submit it for PETROBRAS approval.
Every flexible riser/jumper, except umbilicals, shall be interconnected to the MODA Cabinet,
including production risers, service risers, exportation risers, water injection riser and gas injection
risers. Each riser/jumper has 8 optical fibers to be connected and the infra-structure must be
designed accordingly. The number of MODA cabinets may vary with the number of flexible
risers/jumpers connected to the FPSO.
A splice box is necessary near each riser slot, to connect the Riser Optical Cable with the Cabinet
Optical Cable. The length of Riser Optical Cable in the layout shall be limited to 8 meters to
compensate the necessary fiber over length during the cable installation.
The FPSO CONTRACTOR has some layout options for the Cabinet Optical Cable and splice
boxes. In RECOMMENDED OPTION 1 each riser/jumper has its own splice box and its own
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Cabinet Optical Cable, which has at least 8 fibers. In RECOMMENDED OPTION 2 each group of
2 nearby risers/jumpers shares a splice box and a Cabinet Optical Cable, which has at least 16
fibers. Figure 6 illustrates the two recommended layout options.

Figure 6 – MODA recommended layout options.

PETROBRAS does not recommend grouping more than 2 risers (the Riser Optical Cable length is
too short for that) and the use of multi-cables with intermediate splice boxes (adds extra failure
points, makes the commissioning more difficult).

3.2. MODA Cabinet(s)

The FPSO CONTRACTOR shall design, supply and install cabinet(s) for the MODA System, as
defined on the PARENT DOCUMENT. The number of necessary cabinets may vary with the
number of flexible risers/jumpers expected to be connected in the FPSO. The FPSO
CONTRACTOR shall confirm with PETROBRAS the number of necessary cabinets. The MODA
cabinet(s) have the following minimum requirements:

 Dimensions:
Height: 42 U of rack space (approximately 2000 mm);
Depth: 1000 mm;
Width: 800mm;

 Installed at safe and temperature controlled (24 oC) area;

 The cabinet(s) shall be able to house the MODA equipment (19” rack mounted equipment);
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 Each cabinet shall be interconnected, by Cat 6 cable, to Petrobras cabinet where is placed
Petrobras Firewall. If cable lengths exceed 90 meters shall be cabled with fiber optic in
according with ANSI/EIA/TIA 568-B3. In this case shall be provided optic/ethernet converters in
both sides.

 Each cabinet shall be designed for frontal and back access for proper racks/devices installation
and for maintenance purposes;

 Electrical power consumption and heat dissipation shall be calculated by the FPSO
CONTRACTOR (based on the specifications of the equipment listed on the next session) and
submitted for PETROBRAS approval. PETROBRAS early estimates are around 3 kW.

 The FPSO CONTRACTOR shall propose a detailed design of the MODA cabinet(s) and submit
for PETROBRAS approval.

3.3. MODA Cabinet(s) Equipments and Accessories

The FPSO CONTRACTOR shall supply FBG interrogators, server computers, network switch(es),
KVM console(s) and fiber patch panels, as defined on the PARENT DOCUMENT. The FPSO
CONTRACTOR shall confirm the scope of supply with PETROBRAS.
FPSO CONTRACTOR shall propose model specification of the equipment and submit for
PETROBRAS approval before procurement.
All equipment of the MODA Cabinet with a network port shall be connected to the MODA Cabinet
network switch(es).
The FPSO CONTRACTOR shall supply cabinet accessories (circuit breakers, power strips, heat
dissipation fans, electric cabling, network cabling, optical pigtails, etc) according to the detailed
design of the MODA cabinet(s).
The FPSO CONTRACTOR shall install MODA equipment and accessories in the MODA Cabinet.
All equipment shall be tested by the FPSO CONTRACTOR. Before the test, the FPSO
CONTRACTOR shall submit the testing procedure for PETROBRAS approval. After the test, the
FPSO CONTRACTOR shall submit to PETROBRAS a report with the test results.

3.3.1 FBG Interrogators

The FBG Interrogators shall have the following minimum requirements:

 Swept wavelength laser scan frequency: 125 Hz or better (per channel simultaneously);
 Wavelength range: from 1510 to 1590 nm;
 Wavelength scan range: 80 nm or wider (must include the wavelengths from the previous item);
 Optical channels: 16 channels per interrogator;
 Wavelength accuracy: 2 pm or better;
 Wavelength repeatability: 1 pm or better;
 Dynamic range: 21 dB or better;
 Full spectrum measurement;
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 Peak detection functionality;

 ATEX certification for sensors operation in Zone 0, 1 or 2 environments (Ex op is T4 Ga) as
defined on IEC 60079-28 [2];

 SC/APC or LC/APC Optical Connectors;

 Ethernet Port;
 Sensing Analysis Software;
 Rack Mounted or supplied with rack mount kit;
 Height: 70 mm or less.
NOTE: The only FBG interrogator manufacturer Petrobras has experience with the MODA System
is Micron Optics (www.micronoptics.com). Petrobras has successfully tested Micron Optics FBG
interrogators in many laboratory tests and offshore applications.

3.3.2 Server Computers

The server computers shall have the following minimum requirements:

 Processor clock: 3 GHz or better;
 Processor cache: 8MB or better;
 RAM memory: 8 GB or better;
 2 hard disk drives of at least 500GB each;
 Support to RAID technology;
 2 Ethernet ports;
 Operational system: Microsoft Windows with licenses and all requirements of PETROBRAS
Technical Specifications;
 Rack Mounted;
 Height: 1U.
3.3.3 Network Switch(es)

The network switches(s) shall have the following minimum requirements:

 Gigabit Ethernet ports to accommodate all FBG interrogators and servers computers from the
MODA Cabinet.
 Support Spanning Tree Protocols, Virtual Local Area Networks, Link Aggregation, Flow Control,
Class of Service, Remote Access, Simple Network Management Protocol, Remote Network
Monitoring;
 Rack Mounted;
 Height: 1U.
NOTE: The details of network switch specification shall be clarified with PETROBRAS
telecommunication engineering.
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3.3.4 KVM Console

The KVM console(s) have the following minimum requirements:

 LCD KVM (Keyboard, Video, Mouse) console integrated with KVM switch
 Enough ports to accommodate all server computers in the MODA Cabinet
 Rack Mounted
 Height: 1U
3.3.5 Fiber Patch Panels

The fiber patch panels have the following minimum requirements:

 SC/APC Connectors
 Enough connectors to terminate every optical fiber from the risers (8 fibers per riser), according
to the MODA System layout.

 Rack Mounted
3.3.6 Optical Pigtails

The optical pigtails have the following minimum requirements:

 The length and optical connectors of the optical pigtails shall allow the individual connection of
the FBG Interrogators channels (SC/APC or LC/APC Connectors) to any fiber patch panel
(SC/APC Connectors) of the MODA Cabinet.

 The FPSO CONTRACTOR shall supply one optical pigtail per FBG Interrogator optical channel
(i.e. 16 optical pigtails per FBG interrogator).

3.3.7 FBG Sensor Array

For each MODA Cabinet the FPSO CONTRACTOR shall supply one array of FBG sensors from
the same manufacturer of the FBG Interrogators.

 The array of FBG sensors shall be used in the commissioning of MODA Cabinet and for
troubleshooting purposes. It shall be stored on a rack mounted drawer in the MODA Cabinet.

 The array of FBG sensors shall have the same type of connector of the FBG Interrogators
(SC/APC or LC/APC connectors).

3.4. Cabinet Optical Cables

The Cabinet Optical Cables interconnect the MODA cabinet to the splice boxes at the riser deck.
These optical cables are supplied and installed by the FPSO CONTRACTOR, with the following
requirements:

 Number of fibers: As many fibers as necessary (8 fibers per riser), according to the system
layout proposed by the FPSO CONTRACTOR and approved by PETROBRAS;

 Fiber type: standard single mode fibers (ITU-T G.652 or ITU-T G.654);
 Water blocked;
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 Flame retardant (100% LSZH).

The Cabinet Optical Cables shall be installed in cable trays, also supplied and installed by the
FPSO CONTRACTOR, respecting the cable minimum bending radius. The optical cables shall
withstand any mechanical loads that may be imposed on installation and operation, including
tensile and crush loads.
PETROBRAS recommends the cable to be tight buffered configuration (non-gel filled), breakout
construction. PETROBRAS also recommends the outer sheath to be orange.
The FPSO CONTRACTOR shall submit the chosen optical cable specification for PETROBRAS
approval.
The FPSO CONTRACTOR shall follow the handling/installation recommendations from the optical
cable manufacturer to avoid broken fibers and excessive attenuation in the fibers. After the
installation of the Cabinet Optical Cables, the FPSO CONTRACTOR shall test these cables for
continuity / insertion loss. Cables with broken fibers or excessive attenuation are not going to be
accepted and shall be replaced. Before the test, the FPSO CONTRACTOR shall submit the
testing procedure for PETROBRAS approval. After the test, the FPSO CONTRACTOR shall
submit to PETROBRAS a report with the test results.

3.5. Splice Boxes

The splice box is the interface between the Cabinet Optical Cable and the Riser Optical Cable. It
is a component of the MODA system supplied and installed by the FPSO CONTRACTOR in an
area with easy access on the riser deck. The FPSO CONTRACTOR shall also install the Cabinet
Optical Cable in the splice box, however it is PETROBRAS in cooperation with the FPSO
OPERATOR that installs the Riser Optical Cable in the splice box and makes the splices by
fusion.
The splice box shall have enough splice trays to accommodate every optical fiber from the optical
cables (e.g. A splice box for two risers shall be able to accommodate at least 16 splices).
Since the optical radiation of the MODA system is inherently safe, the splice box not need to be
explosion proof. The only purpose of the splice box is to protect the splices and optical cables
ends from harsh environment thus it shall be sealed against dust and powerful water jets (IP 66 or
better).
The FPSO CONTRACTOR shall supply cable glands for the Cabinet Optical Cable.
For each Riser Optical Cable to be connected to the splice box, according to the system layout,
the splice box shall have one 3/4 inch outside diameter male 37°flare tube fitting (37º JIC size 12)
(reference: SS-1210-6-12AN). Since the Riser Optical Cable only will be installed offshore, each
male 37° flare shall be protected with a matching female cap.
The FPSO CONTRACTOR shall submit the chosen splice box (or adapted junction box), cable
glands, tube fittings and other accessories specifications for PETROBRAS approval.
When the FPSO CONTRACTOR installs the Cabinet Optical Cable on the splice box it is
necessary to leave at least 2 meters of cable over length inside the splice box. The over length
allows a proper splice without mechanical stress, which is relieved by turns. The over length also
allows rework in case of damaged splices.
The information necessary to purchase the splice box (Cabinet Optical Cable diameter, number of
cables, numbers of splices, installation procedure) are defined by the FPSO CONTRACTOR. The
information about the Riser Optical Cable is described on the section below.
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3.6. Trays for the Riser Optical Cable

If the splice box is not located right beside the End Fitting (riser slot), a cable tray between the
riser slot and the splice box is necessary to protect the cable after the riser installation. The FPSO
CONTRACTOR shall supply and install these trays.
The cable tray design needs to account for the length of the Riser Optical Cable, including bends
and at least 2 meters of over length for fiber splicing.
The Riser Optical Cable is a component of the MODA system supplied by the RISER
CONTRACTOR and installed by PETROBRAS in cooperation with the FPSO OPERATOR with
the following specifications:

 Maximum Length: 10 m;
 Number of fibers: 8 single mode fibers (ITU-T G.652 or ITU-T G.654);
 Water blocked, flame retardant (100% LSZH);
 Nominal outer diameter: approximately 30 mm;
 Minimum Bending Radius: 150 mm.
3.7. Inspection and Testing

As discussed on the previous sections, after installation the FPSO CONTRACTOR shall test
MODA system infrastructure, including optical cables and equipment.
The FPSO CONTRACTOR shall submit the test procedures for PETROBRAS approval.
The tests shall be witnessed by PETROBRAS specialists on the MODA System. The FPSO
CONTRACTOR shall submit to PETROBRAS a test schedule 15 days before the test execution.
The FPSO CONTRACTOR shall submit the test procedures for PETROBRAS approval.
The FBG interrogators are the main equipments of the MODA system and PETROBRAS
recommends the FPSO CONTRACTOR to ask vendor/manufacturer support during the
elaboration of the testing procedures of these equipments.
PETROBRAS specialists on the MODA System shall also inspect the installed MODA
infrastructure.
Nonconformities identified in inspection and testing shall be fixed by the FPSO CONTRACTOR
and inspected/tested again.
The FPSO CONTRACTOR shall submit the final test report (without nonconformities) for
PETROBRAS approval, including the results of all tests.

4. Review of the FPSO Scope

As defined in the previously sections, the FPSO scope includes:

 Supply and installation of cable trays for the Riser Optical Cable of each flexible riser / jumper;
 Supply and installation of splice boxes for each flexible riser / jumper;
 Supply and installation of cable trays for the Cabinet Optical Cable;
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 Supply, installation and testing of the Cabinet Optical Cables;

 Supply, installation and testing of the MODA system cabinet, including equipments and
accessories;

 Detailed design of the MODA System Layout and the MODA Cabinet.

5. Review of Information to be exchanged with PETROBRAS

As defined on the previous sections there are several information the FPSO CONTRACTOR shall
confirm with PETROBRAS, submit for PETROBRAS approval and inform to PETROBRAS.
Any information to be exchanged with PETROBRAS shall be addressed to the subsea
engineering group at Petrobras’ headquarters.

5.1. Information defined on PARENT DOCUMENT

The FPSO CONTRACTOR scope of supply is defined on the PARENT document and before
initiating any design the FPSO CONTRACTOR shall confirm this scope with PETROBRAS.
The scope of supply information that need to be confirmed includes:

 Number of risers/jumpers to be connected on the MODA System;

 Quantity of MODA cabinets;
 Quantity of equipments on the MODA Cabinets (FBG interrogator, server computers, etc).
5.2. Detailed design

During the detailed design done by the FPSO CONTRACTOR and before the procurement of any
material in the FPSO CONTRACTOR scope of supply, the FPSO CONTRACTOR shall submit for
PETROBRAS approval the design documents and equipment model specifications, including:

 MODA System Layout;

 MODA cabinet(s) drawings and schematics;
 MODA cabinet(s) power and heat estimates calculations;
 Cabinet Optical Cable datasheet;
 FBG interrogator datasheet;
 Server computers datasheet;
 LCD KVM console datasheet;
 Network switch datasheet;
 Fiber patch panels datasheet;
 Splice box drawings and datasheet;
 Splice box cable glands drawings and datasheet.
 Splice box tube fittings drawings and datasheet.
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5.3. Inspection and Testing

Before the installation of the MODA infrastructure on the FPSO the FPSO Contractor shall submit
the tests procedures of the infrastructure for PETROBRAS approval, including:

 MODA cabinet equipments and accessories test procedures, specially FBG interrogators;
 Optical cables test procedures.
Before the test execution the FPSO Contractor shall submit the test schedule to PETROBRAS. As
defined on previous sections, PETROBRAS MODA specialists shall witness the test execution.
After tests execution the FPSO CONTRACTOR shall submit to PETROBRAS the test reports.
In case of corrective actions for identified nonconformities and, eventually, new tests, the FPSO
CONTRACTOR shall submit to PETROBRAS the updated test reports.

5.4. Databook

After the final commissioning of the MODA infrastructure the FPSO CONTRACTOR shall submit
to PETROBRAS the MODA System databook, including:

 Documentation informing which fiber of which riser is connected to which patch panel and FBG
Interrogator;

 Updated version (as-built) of documentation submitted during detailed design phase;

 Model and serial number of installed equipment on the MODA Cabinet;
 Final test reports.