the canadian arctic offshore patrol ship (aops) design

© HER MAJESTY THE QUEEN IN RIGHT OF CANADA (2012)

The Canadian Arctic Offshore Patrol Ship (AOPS) Design

Joint SNAME CIMarE Technical MeetingFebruary 18, 2012

Dan McGreer Tony VollmersPrincipal Engineer Project Engineer

© HER MAJESTY THE QUEEN IN RIGHT OF CANADA (2012)24/02/2012 |

Overview

Company BackgroundPrimary Ship RequirementsProcurement ProcessPrincipal ParticularsGeneral ArrangementPropulsion SystemBoats and Cargo HandlingAviation Facilities


STX Marine Inc.

STX Canada Marine Inc. and STX US Marine Inc. are wholly owned subsidiaries of STX Offshore and Shipbuilding Korea with offices located in:

Vancouver, British Columbia, - Main technical office, 45 staff

Ottawa, Ontario, - Government projects, 3 staff

Houston, Texas, - Offshore Vessel projects, 15 staff


STX Marine

42 Vessels currently contracted for or under construction

8 are OPVs including 2 with LNG as fuel


AOPS Primary Ship Requirements

Designed to Class Society and Commercial Ship StandardsBreak up to 1m of Level Ice (IACS Polar Class 5)Open Water Speed of 17 knotsGood Seakeeping for Offshore Patrol MissionsLimited Command Management SystemGun Armament for Sovereignty EnforcementAccommodations for 85 personnel; 45 crew and 40 supernumerariesSupport Landing Craft and Boarding Boat OperationsAviation Facilities for Commercial and Military HelicoptersCargo Handling; 5 TEU containersFull Propulsion Redundancy


Procurement History

DELMS Contract - BMT Fleet Technology/STX Canada Marine - May 2008• Developed System Requirements Document (SRD)• Developed SOW and RFP for Project Implementation (PI) and In Service

Support (ISS).• Developed Definition Design to validate SRD• Developed Contract Design – Appraised by Lloyd’s Register

First Project in NSPS Combat Ship Work PackageCombat Work Package awarded to Halifax Shipyard under NSPS – Oct 2011DELMS Team to Provide Engineering Support to the Government during Construction.


Principal Particulars

LOA 98.0 mLWL 91.0 mLBP 86.4 mBOA 19.0 mBWL 18.4 mT 5.75 mDisplacement 5874 tonnesInstalled Power (Gensets) 4 x 3300 kW(Propulsion Motors) 2 x 4500 kW


Hull Form

Designed to have a strong balance of capabilities between icebreaking, seakeeping, manoeuvrability, and powering performance


Hull Form Optimization using Computational Fluid Dynamics


Model Tests at NRC Institute of Offshore Technology (IOT)

24/02/2012 |


Ice Model Tests

24/02/2012 |


Powering Performance Estimate

Powering Predictions - CFD vs Model Tests

0 2 4 6 8 10 12 14 16 18

Speed [knots]

CFD Results Model Test Results

Powering Predictions - CFD vs Model Tests

0 2 4 6 8 10 12 14 16 18

Speed [knots]

CFD Results Model Test Results


Wake Adapted Propeller Design

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Seakeeping

Potentially challenging due to combined performance requirements in open water and iceAnalyzed with ShipMo PC, ShipMo 3D and recent model testsRetractable active fin stabilisersEvaluated against NATO STANAG 4154Seakeeping requirements were evaluated at Sea State 6 for transit, fuelling, and boat launch and recovery; Sea State 5 for boarding operations; and Sea State 3 for helicopter operationsSeakeeping requirements were found to be feasible with limited slamming, wetness, and motion induced interruptions, no propeller emergence, and no operational restrictions.


General Arrangement


Boats and Cargo Handling

The AOPS is equipped with a flexible cargo deck aft that can be used to stow containers or a landing craft.A 20 tonne crane is used for cargo handling


Boats and Cargo Handling

The AOPS is equipped with two rescue/boarding boats that can be launched and recovered in SS 5.The ship has telescoping davits that can launch an RCMP RHIB or a lifeboat in the Arctic


Aviation Facilities


Aviation Facilities

The AOPS is equipped with aviation facilities to support:• Landing, stowing, refueling, and minor maintenance of a Bell

212 or 412• Landing, stowing, refueling, and minor maintenance of a

CH148 Cyclone• Landing and refueling of a CH149 Cormorant

The AOPS has a flight deck, fixed hangar, flight deck fire fighting capabilities, and night / limited visibility flight control capabilities.Flight operations are up to Sea State 3.

© HER MAJESTY THE QUEEN IN RIGHT OF CANADA (2012)Jun-11 |

Velocity contours at 19m elevation (rotor plane)for wind at 15 deg off bow

CFD – Air Turbulence Calculations


Combat and Navigation Systems

AOPS is a naval ship but is not considered a combatant. The Multipurpose Operations room will not be continually manned when ship is at sea.The AOPS has a small caliber gun for sovereignty enforcement, two machine guns, and weapons lockers.Use of Commercial Off The Shelf Equipment to be maximized.Design to promote efficient use of limited manpower resources. Software development to be minimized. Multi-function workstations to be utilized.Communications System to be integrated with LAN.


Propulsion System

AC-AC Diesel-electric Twin Screw Propulsion System• 3.8m prop dia, 1m hub, bolt on blades.• 400mm shaft, 450mm propeller shaft – PC5.

4500 kW per Shaft• Motors are capable of 150% over torque during ice

breaking/interactions4 x 3300 kW diesel gensets; IMO Tier 3 with SCR

• Although some benefits with father/son configuration; commonality of components for support won out

• Many engines in this power rangePMSR* Propulsion System Redundancy

• Each shaft line is completely segregated for fire/flood risks


Support Systems – Cold Temperature Protection

24/02/2012 |

Machinery and personnel support systems were developed with Winterization rules and the need to withstand -29°C

Tank heating, trace heating, reduced ventilation in extreme cold.

Extensive use of recovered heat from engine cooling circuits and exhaust recovery boiler for HVAC and tank heating.

Covered mooring flat with blast heaters sized to de-ice the deck above.

Machinery space ventilation heat recovery.

Deck de-icing to meet Winterization requirements.


Machinery Arrangement


Conclusion

The AOPS will be a flexible platform for sovereignty enforcement and patrol in the Arctic, Pacific and Atlantic Oceans.


Questions?

the canadian arctic offshore patrol ship (aops) design

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