Holland Class offshore patrol vessels (OPVs) were built by Damen Schelde Naval Shipbuilding for the Royal Netherlands Navy. A series of four OPVs are named after Dutch coastal provinces.
The Royal Netherlands Navy deploys the OPVs in the Caribbean and the North Sea. The vessels can support international task forces in anti-piracy missions, counter-drug operations and block ships in coastal areas during crises.
With the ability to carry supplies and more than 100 people, the vessels can also carry out emergency missions.
Holland Class OPV design and features
The vessel has a broad platform to provide stability in marine seas. Its stealthy design incorporates innovative techniques to reduce radar reflectivity. The body is built with thick steel, which has a lower tensile strength. It is heavier than the steel used for frigates and can resist the impact of small-calibre weapons.
The hull is stretched and the bridge and superstructure are placed aftwards, to help optimise the seakeeping capabilities of the vessel. The speed is cut down to reduce fuel consumption and increase the range of the vessel. Two rigid-hulled inflatable boats (RHIBs) and one NH-90 helicopter are also carried to support interception operations.
Hr. Ms. Groningen (P843)
The Holland Class is also equipped with a CAMS-Force Vision integrated fire control system and two monitors for non-lethal protection and fire fighting. The OPV also features a gas citadel, explosion-resistant structures, redundant and decentralised systems.
The vessel is fitted with highly automated systems, including a shore support and management system, calamity system, warning system and monitoring system. The patrol vessel has an overall length of 108.4m, a width of 16m and a draught of 4.55m. Displacement of the vessel is 3,750t.
The OPV can accommodate 50 ship crew members and up to 40 non-listed persons, including a helicopter detachment, law enforcement detachment (LED), a platoon of marines or a medical team.
Approximately 100 evacuees can also be boarded. The ship can sail at a speed 21.5kt. Its maximum range is 5,000nm.
(© : MER ET MARINE – VINCENT GROIZELEAU) – meretmarine.com
Two rigid-hulled inflatable boats (RHIBs)
Holland Class offshore patrol vessel construction details
In December 2007, the Royal Netherlands Navy signed a contract with Damen Schelde Naval Shipbuilding in Vlissingen, the Netherlands, for the construction of four patrol vessels.
Construction was carried out in parallel, with the first two at Damen Schelde Naval Shipbuilding in Vlissingen, the Netherlands, and the remaining at Damen’s sister shipyard in Galatz, Romania. The project cost was estimated at €467.8m ($687.9m). These ships were built between 2008 and 2012, and the fourth ship was built in 2013.
Ships in class
The ships were named after Dutch provinces of historical maritime importance.
|Pennant number||Ship||Laid down||Launched||Commissioned|
|P840||Holland||8 December 2008||2 February 2010||6 July 2012|
|P841||Zeeland||5 October 2009||20 November 2010||23 August 2013|
|P842||Friesland||26 November 2009||4 November 2010||22 January 2013|
|P843||Groningen||9 April 2010||21 April 2011||29 November 2013|
OPV guns and weapons
The main gun is a 76mm Oto Melara Super Rapid gun. It has a firing rate of 120 rounds a minute and a range of 16km. The vessel is also fitted with a 30mm Oto Melara Marlin WS gun, two 12.7mm Oto Melara Hitrole NT guns and two 12.7mm M2HB machine guns. The guns onboard can be remotely operated.
1 × 76 mm Oto Melara Super Rapid
The Oto-Melara / Oto-Breda 76/62SR 76mm (3-inches) 62-caliber Super Rapid gun is a lightweight, automatic loading, rapid fire naval gun system used against shore, sea and air targets.
Manufacturer: 1963-2001 Oto-Melara / 2001- OtoBreda
Produced: Compact: 1963- / Super Rapid: 1988-
Caliber: 3 inches / 76,2 mm
Barrel lenght: 186 inches / 4,72 meters (= 62 caliber)
Weight: 7900kg, empty (Super Rapid)
Shell: 76 x 900 mm / 12,34 kilograms
Elevation: – 15° to + 85°
Rate of fire: Compact: 85 rpm / Super Rapid: selectable from single shot up to 120 rpm
Muzzle Velocity: 925 m/s (1100 m/s – DART)
Magazine: Compact: 80 rounds / SR: 85 rounds
16 kilometers with standard ammunition
20 km with extended range ammunition
up to 40 km with VULCANO ammunition
– Super Rapid
– Stealth casing
– DAVIDE/STRALES radio frequency guidance system for DART guided ammunition
– HE (high explosive) – 6,296kg / Range 16km / effective range 8km (4km vs. air targets at elev. 85°)
– MOM (multi-role OTO munition)
– PFF (pre-formed fragmentation) – anti-missile ammunition
– SAPOM (semi-armored piercing OTO munition) – 6,35kg / Range 16km
– SAPOMER (semi-armored piercing OTO munition, extended range) – Range 20km
– DART (driven ammunition reduced time of flight) – sub-calibre guided ammunition against multiple targets
(missiles and maneuvering targets at sea) 4,2kg in barrel / 3,5kg in flight / 660mm lenght / effective range >8km
– VULCANO (76mm unguided and guided extended range ammunition) – under development
1 × 30 mm Oto Melara Marlin WS
The MARLIN – WS is a highly accurate and reliable multi-role system, particularly effective in the simultaneous engagement of multiple targets such as swarms of Fast Inshore Attack Crafts.
2 × 12.7 mm Oto Melara Hitrole NT
HITROLE® 12.7mm naval turret is a modern system fully controlled from a remote station via an advanced control console that allows the gunner to operate from a protected position within the ship’s structure: any operation, including loading and recocking, can be undertaken with maximum safety for the operator.
Low weight and high level of flexibility make this turret particularly suitable for installation as main armament of any small patrol vessel engaged in border control, maritime traffic interdiction or as a secondary armament on larger ships for self protection in the anti-terrorism role.
The turret is electrically operated and very accurate due to powerful digital servos.
Sighting and tracking actions are performed by means of a high performance day TV camera.
2 x 12.7mm M2HB machine guns
|Designation||0.50″ (12.7 mm) M2 Browning Machine Gun (BMG)
Navy Fixed Right Hand Feed: 1005-00-122-9339
Navy Fixed Left Hand Feed: 1005-00-122-9368
|Ship Class Used On||Almost all warships 1930s
Many warships 2000s
|Date Of Design||Original design: about 1920
M2 version: 1932
|Date In Service||about 1933 on US Navy ships|
|Gun Weight||Air-cooled: 84 lbs. (38 kg)
Water-cooled: 100.5 lbs. (45.6 kg), 121 lbs. (54.9 kg) with water
Aircraft: 61 lbs. (27.7 kg)
|Gun Length oa||Air-cooled: 61.4 in (156 cm)
Water-cooled: 65 in (165 cm)
Aircraft: 37 in (0.940 m)
|Barrel Length||Air-cooled: 45 in (1.143 m)
|Rifling Length||Air-cooled: 41.9 in (1.064 m)
|Chamber Volume||1.5 in3 (24.6 cm3)|
|Rate Of Fire 1||Air-cooled: 550 rounds per minute cyclic
Water-cooled: 450 – 600 rounds per minute cyclic
Aircraft: 750 – 850 rounds per minute cyclic
The practical rate of fire for these weapons varies widely depending upon the model and application. For the HB version, infantry training in the 1970s was to fire bursts of 8-10 rounds at a time, each followed by a short pause. Shipboard gunners of the 1930s-40s using water-cooled versions were trained to fire continuously in order to be able to “walk” the tracers onto the target. As the practical range against aircraft for this weapon was approximately 1,500 yards (1,400 m), an aircraft approaching at 200 knots would be under fire for about 14 seconds, or the rough equivalent of one belt of 100 rounds.
6 x 7,62 mm FN MG
Caliber: 7,62x51mm NATO
Weight: 11 – 13 kg on bipod (depending on version), ~21 kg on tripod
Length: 1260 mm
Barrel length: 545 mm
Rate of fire: selectable, 650-750 and 950-1000 rounds per minute
Hr. Ms. Zealand (P841)
NH-90 helicopter facilities
Hanger (© : MER ET MARINE – VINCENT GROIZELEAU) – meretmarine.com(© : MER ET MARINE – VINCENT GROIZELEAU) – meretmarine.com
The patrol vessel has a fully-equipped hangar to support the operations of a NH-90 helicopter. The helicopter is equipped with homing torpedoes and a sensor system. The sonar and radar on the helicopter allows it to make observations beyond the radar horizon of the OPV. Space is available under the helicopter to accommodate containers of relief supplies.
Holland Class OPV sensor technology
The OPV is the first vessel in the Royal Netherlands Navy to be fitted with Thales Integrated Sensor & Communication Systems (ISCS).
The sensor suite includes a Sea Master 400 air warning radar, a Watcher 100 active phased-array surface detection and tracking radar, identification friend or foe (IFF) system, electro-optic or infra-red panoramic surveillance system, a combat management system, a command and information centre, a mine detection sonar, RADIAC sensors and an infra-red Gatekeeper / electro-optical warning system. The OPV can make observations within a range of 140nm.
The system integrates optical sensors, RF systems and radars. ISCS includes:
- Sea Master 400 SMILE air warning radar;
- SeaWatcher 100 active phased-array surface detection and tracking radar;
- gateKeeper Electro-optical 360° surveillance system;
- Satellite Radio Communication System.
Sea Master 400 SMILE air warning radar
Sea Master 400 is a non-rotating, four faced S-band (NATO E/F-band) volume search radar designed to simultaneously provide air surveillance, helicopter control, surface surveillance and weapon control functions. Drawing on technology previously proved in Thales’ SMART-L, SMART-S Mk 2 and APAR radar systems, Sea Master 400 uses active phased array multibeam technology to enable the concurrent provision of situational and critical awareness through a single highly automated mode of operation.
Exploiting proven multi-beam and Doppler processing principles, Sea Master 400’s advanced system architecture delivers simultaneous functionality at high update rates regardless of environmental and clutter conditions. These include large search volume with high elevation coverage, reliable detection of small targets, rapid automatic track initiation, low false alarm rates, and helicopter detection and approach control.
Sea Master 400 has been specifically engineered for installation in an integrated mast structure. Its four faces provide unrestricted coverage, while the hardware design allows for easy accessibility for maintainers inside the mast, so promoting a high Mean Time To Replacement and limiting the exposure to external hazards. Sea Master 400 is known as SMILE in the IM400 systems contracted by the Royal Netherlands Navy.
SeaWatcher 100 active phased-array surface detection and tracking radar
Thales SEASTAR being assembled to the main mast
– X-band (I/J) active phased array radar for all weather surface surveillance.
– Per antenna module ~1 kW transmitter power is radiated.
– 360 degrees unblocked surface coverage
– An exceptionally high degree of automation allowing the operator to focus on the operational picture
– Designed for operation in highly cluttered littoral environments.
– Dedicated detection and tracking algorithms for small targets like asymmetric threats, mines,
swimmers and periscopes.
– The Sea Watcher 100 architecture allows for strongly reduced logistical support, while using fully solid-state technology and non-rotating antenna design with high MTBCF and low MTTR.
– Minimum target speed for track initiation: 0 m/s
– Radar resolution cell: 7.5 m / 1 degree. (short/medium range), 30 m / 1 degree (long range).
– Update time: 1 s (short range), 1.6 s (medium range), 5 s (long range), employed simultaneously all in one mode.
– Thanks to the user-friendly design, the Sea Watcher 100 requires a minimum level of operator
Sea Watcher 100 with its unique architecture overcomes the need for dedicated detection modes for different target types and enables long dwell time -for good Doppler resolution- combined with high update rate, as would be impossible with conventional rotating radars. Sea Watcher 100 employs three search patterns with different update rates simultaneously and is thus able to automatically select optimal search patterns for short, medium
and long range surveillance.
Sea Watcher 100 has a modular design based on 1 to 4 antenna faces for 100 up to 360 degrees
coverage in azimuth, allowing the customer to balance the coverage requirements with installation constraints. The Sea Watcher 100 can track more than 200 targets simultaneously.
GateKeeper Electro-optical 360° surveillance system
Gatekeeper is the latest addition in the passive surveillance product family. Non-rotating (staring) IR/TV cameras provide a continuous 360deg panoramic visual overview of the own ship environment. Adequate tracking facilities are provided to track even the smallest surface target.
Gatekeeper has been designed as an automatic own ship close-range security sensor when in harbor, at anchor or sailing close to unfriendly shores.
The system is ideally suited as clip-on for existing platforms. It provides 24-hour, day/night surveillance allowing the crew to be deployed more efficiently with personnel being able to stay inside a protected, airconditioned environment rather than having to stand watch on deck.
Gatekeeper also allows the ship to have a relaxed alert state and still be able to respond quickly in case of an emerging threat. Gatekeeper excels in harbours and confined waterways where radar use is restricted and radar performance is limited.
A Gatekeeper system will have up to 4 sensor units, each comprising non-cooled IR and three TV cameras with a combined view of 120° in azimuth. The 360° surveillance image is available for multiple operator stations, where each operator has his own “software controlled window” for amplification of track data and zoom-in without disturbing the 360° view for other users at the bridge, operations room or watch stand. The panoramic view can be displayed on large screen(s) in the combat information center.
Holland Class WCMS
The wireless communication and messaging system on board Holland Class is about using function based workflow to provide intelligent messaging to and from crew members.
The first group of intelligent messaging is called system maintenance messaging and provides real time maintenance information from platform systems generating system messages & tasks to be accepted by the responsible crew member. These system messages will be controlled by supervisors and/or automated escalation control procedures eg a non-confirmed fire detection notification. In this case the damage control assistant, responsible for lets say the damage control section AFT, will receive a short system instruction to check the fire alarm accordingly. DCA-AFT is requested to report immediately along the chain of command towards the damage control officer.
The second group of intelligent messaging is all about crew member conference grouping, intercom users setting up predefined voice conference groups to retrieve and share information between high mobile crew members at the calamity spots and low mobile crew members at the information management centres. Source heipcompany.nl
Equipped with a combined electric or diesel (CODELOD) propulsion system, the patrol vessel is powered with two MAN 12V28/33 diesel engines rated at 5,400kW, fitted to a Renk gearbox.
Two MAN 12V28/33 diesel engines
Two MAN 12V28/33 diesel engines rated at 5,400kW
Each propulsion system drives a Rolls-Royce controllable pitch propeller. The electric propulsion is principally deployed for low-speed missions and minimises fuel consumption, while maximising the vessel’s endurance.
The keel for the first vessel, Hr Ms Holland (P840), was laid in December 2008. It was launched in February 2010 and commissioned in May 2011.
The keel for Hr. Ms. Zealand (P841) was laid in October 2009 and the vessel was launched in November 2010. Zealand commenced its sea acceptance trials (SAT) in August 2011. It was commissioned in October 2011.
The third vessel, Hr. Ms. Friesland (P842), was laid in November 2009 and launched in November 2010. The SAT for the Friesland began in September 2011 and was completed in November 2011. The vessel was commissioned in April 2012.
The keel for the last in the class, Hr. Ms. Groningen (P843), was laid in April 2010. It was launched in April 2011 and commissioned in November 2013.
|Displacement:||3750 tons (full load)|
|Propulsion:||combined diesel-electric or diesel drive (CODELOD)
4 Wartsila 12V26 diesel engines (5400 kW)
2 shafts, 2 controlable pitch propellers (CPP), 3,20 meters diameter
|Aviation:||platform & hangar for 1 Helicopter (NH-90)|
|Armament:||1 x 3” 76mm/62 caliber Oto-Melara super rapid gun
1 x 30mm Oto-Melara MARLIN WS (Modular Advanced Remotely Controlled Lightweight Naval Weapon Station)
2 x 12,7 mm Oto-Melara Hitrole NT
2 x 12,7 mm Browning M2HB MG
6 x 7,62 mm FN MG
|Systems:||THALES Integrated Mast (IMAST) Module with:
– Sea Master 400, non-rotating, four-face, active phased array volume air search radar
– Sea Watcher 100, non-rotating, active phased array surface detection and tracking radar
– non-rotating IFF-system (IFF interrogator antenna / IFF transponder antenna / Link-16 transmit antenna)
– electro-optical security system
– Radar ESM
– Communication ESM
– ICAS – Integrated Communications Antenna System:
> VHF, UHF, AIS, Link-16 tactical datalink, GSM/UMTS, Iridium, Wimax, Satcom
Combat management system
Command and Information Center
Integrated internal & external communication system with 7 separated networks
|Complement:||50 (+additional space for 40)|
Technical data seaforces.org
Main material source naval-technology.com
Revised Dec 30, 2017