PPA Class Multi-Purpose Offshore Patrol Vessels, Italy
A class of seven multi-role offshore patrol vessels (Pattugliatori Polivalenti d'Altura (PPA)) on order for the Italian Navy will be delivered by 2026. Italian shipbuilding company Fincantieri is the prime contractor for the PPA-class.
Construction on the first patrol vessel began in February 2017. The ships are intended to perform a number of duties in Italy's territorial waters. Their mission capabilities include patrolling, surface combat, anti-piracy, monitoring, protection and control of maritime zones, and rescue of personnel in distress.
The keel-laying ceremony of the first PPA was held at Fincantieri's Muggiano shipyard in May 2017.
The first PPA will be delivered in 2021, and deliveries of the remaining vessels are scheduled to take place between 2022 and 2026.
PPA-class procurement details
The procurement of the PPA-class offshore patrol vessels is part of Italian Navy's fleet renewal plan, which is aimed at replacing the ageing fleet of patrol boats, corvettes and frigates.
In May 2015, the Organisation for Joint Armament Cooperation (OCCAR) awarded a €3.5bn ($3.89bn) multi-year contract to a consortium of Fincantieri and Finmeccanica (now Leonardo) for the construction of six PPAs, with an option for additional four units and one logistic support ship (LSS).
The contract also requires Fincantieri to provide integrated and in-service logistics support for the vessels for a period of ten years. A contract option was executed for the seventh vessel in November 2015, increasing the total contract value to approximately €5.4bn ($5.74bn).
The ships are being built at Fincantieri's integrated naval shipyards at Riva Trigoso and Muggiano, Italy.
Design and features of Italy's future offshore patrol vessels
Each offshore patrol vessel will be able to carry up to 171 crew members. The overall length is approximately 143m, while the length between perpendiculars is 133m. The depth and beams of the vessel are 10.5m and 16.5m respectively.
An 11m-long rigid hull inflatable boat (RHIB) will be carried in the middle of the ship for patrol and transportation missions. Launch and recovery of the RHIB will be performed either by the lateral cranes located beside the RHIB or through a hauling ramp located at the rear. The vessel's bridge is placed amidships.
A hangar located at the aft of the vessel will hold up to two NH90 or one EH101 medium-lift utility helicopter. A flight deck, which is placed next to the hangar near the stern of the ship, is intended to support the operations of one NH90 or one EH101 helicopter.
Armament of the PPA-class vessels
The PPA-class offshore patrol vessels will be armed with OTO Melara 127/64 LW high-calibre Vulcano gun system (main armament) and OTO Melara 76/62 medium-calibre gun mounts for defence against surface, airborne, maritime, and asymmetric targets.
Two 25mm remotely controlled small-calibre gun systems will be used for close-range combat operations, anti-smuggling and maritime interdiction. MBDA's anti-ballistic missile system will be fitted to further increase the vessel's anti-ship defence capability.
The multi-role vessels will use a heavy-weight torpedo system to detonate under-water targets.
Passive protection for the vessel will be provided by OTO Melara Decoy Launching System (ODLS) remote-control launching system, which is effective against infrared seeker-equipped missiles and radars as well as anti-submarine warfare decoys.
Elettronica's electronic warfare system will be used to provide self-protection for the ship.
Navigation and communications
The vessel's navigation and combat system operations will be performed by the crew members from the bridge using a combat management system, which integrates weapons, sensors and other units aboard the ship.
A number of sensors will be installed to ensure safe operation of the boat at sea. They include next-generation identification friend and foe (IFF) sensor with a circular antenna, infrared sensor, diver detection sonar, active towed array sonar system, NA30S MK2 weapon control system based on a multi-sensor fire control radar (X and Ka), LPI SPS732 air and ground surveillance radar, and KRONOS dual-band 3D multi-function active electronically-scanned array (AESA) radar with four C- and X-dual band radars.
Multiple non-rotating optical heads will be fitted on the four sides of the ship to provide 360° surveillance. Target detection and tracking will be performed by a static IRST (infrared search and track) system. A bathythermograph unit will be used for measuring the water temperature.
Communication for the boat will be provided by integrated communications systems including multi-band satellite systems, software-defined radios and long-range acoustic devices (LRAD).
PPA-class OPVs propulsion and performance
The PPA-class will be powered by a combined diesel and gas (CODAG) propulsion system consisting of two MTU 20V 8000 M91L engines, each developing 10,000kW of power, and one GE LM2500+G4 gas turbine with a capacity of 35,320kW.
The vessel will also feature four MAN 12V175D GenSets, each rated at 1,640kW, and two shafts, driving controllable-pitch propellers.
Driven by GE's shock-proof MV3000 drives, the small gearbox-mounted electric motors will be installed to drive the ship at low speeds, while generating power for the onboard sensors and weapons.
The offshore patrol vessel can achieve a maximum speed of more than 32kt and a range of 5,000nm. The MTU diesel engines alone allow the vessel to sail at speeds of 24kt.
Sensors and weapon systems for the PPA multi-role offshore patrol vessels will be supplied by MBDA, OTO Melara, Elettronica, and WASS.
Leonardo's subsidiary Selex is responsible for providing combat management system for the vessels. The company will develop a bridge system in co-operation with Fincantieri. In addition, Selex will provide assistance for subsystems such as sensors and weapons.
GE's Marine Solutions was selected to supply seven LM2500+G4 gas turbines in March 2016. The turbines will be developed by Avio Aero in Italy, while GE Power Conversion will produce drives.
Rolls-Royce won a contract in October 2016 to provide 14 MTU 20V 8000 M91L engines for seven PPA vessels, with deliveries scheduled to commence in 2017.
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