The Horn class is a three-ship class of reefer ships with ro-ro properties from the former Hamburger Horn line .
The Horn-class ships were built by the Uljanik shipyard in Pula for the Pluto Shipping Monrovia shipping company and chartered out to the Horn-Linie. The lead ship, the Hornbay , was delivered at the end of 1990, the other two ships of the class were delivered in 1991 ( Horncap ) and 1992 ( Horncliff ).
The ships were designed for the transport of refrigerated cargo. They have 525,000 ft³ of refrigerated cargo space in 15 holds, four hatches and four decks. The loading space height is 2.2 m and the ships are therefore suitable for transporting pallets .
There are four side ports on the port side for cargo handling in the loading ports . In the port of discharge, the fruit cartons are unloaded for a long time with land-side elevators, from 1995 increasingly as pallet goods with on-board cranes. The refrigerated containers on deck are also handled with the four electro-hydraulic cranes with a crane capacity of 25 t. In the so-called "twin operation mode" a synchronized operation of two cranes is possible, in the coupled operation 50 t are achieved. The insulated folding hatch covers on deck and in the holds are operated hydraulically.
The ships can operate as RoRo ships on the ballast voyage , as they are equipped with a stern ramp with dimensions of 23 × 5 m and a garage in the stern. In the upper cargo compartments there are hydraulically operated doors with an opening of 2.5 × 2 m in the insulated cargo compartment bulkheads so that cars can be loaded quickly via the rear ramp and through the bulkheads . The garage in the rear has high spaces, so trucks, construction machinery and even helicopters can be transported here. Around 300 refrigerated containers can be stowed on deck .
Propulsion and power generation
The fixed propeller is driven by a slow-running two - stroke engine of the type MAN-B & W 6L60 MC with six cylinders , which has a nominal speed of 117 rpm and drives a shaft generator with a nominal output of 1,100 kW. Three MAN 6L28 / 32 diesel generators with an output of 1,250 kW at 720 rpm are also available for power generation. The Siemens / Uljanik S 7213 generators have an output of 1,440 kVA, cos 0.8, 60 Hz and a voltage of 440 V. With the exception of the emergency diesel, all diesel engines are powered by heavy fuel oil . A bow thruster with 600 kW power at 380 rpm is installed for better maneuvering .
Cargo cooling system
The cargo cooling system with temperatures down to −25 ° C consists of the direct cooling system, the refrigerant compressors, the evaporators in the cargo hold and the air cooling system. The holds can be divided into seven temperature zones in order to transport refrigerated goods with different temperature requirements. The total of eight screw compressors with the seawater cooled condensers for liquefying the refrigerant R22 are located in the deckhouses between hatches 1 and 2 and 3 and 4. The evaporator rooms with the cargo hold fans are located directly below. The electric motors of the cargo space fans are pole-changing and, depending on the necessary hourly air circulation rate, can each with the speeds 1800 / min (90-fold air change for bananas), 900 / min (60-fold air change, apples, pears), 600 / min ( 30 air changes, frozen goods) can be operated.
The total space for pallets in the cargo hold is around 5,500 m² with the "sideshorings" that are tucked up to make the package load stable. The air circuit in the cargo hold is designed for an air exchange in relation to the empty cargo hold. The air flow is from bottom to top, i.e. H. The fans in the evaporator compartments suck the air out of the top of the cargo compartment and push the air through the evaporator, where the charge heat is transferred to the evaporating refrigerant. The cooled air then flows under the grating of the hold and through holes into the cooling cargo standing on the grating. The air flowing through the cargo absorbs the cargo heat and flows upwards, where it is sucked off again, thereby closing the air cycle. When the fruit load is breathing, the CO 2 content in the hold atmosphere is measured as a measure of the change in the ripening processes in the fruit. If the CO 2 limit is exceeded, up to twice the hourly fresh air can be supplied with separate fans. This slows down the ripening process again.
The fire extinguishing system consists of two electrically driven centrifugal pumps with a volume flow of 83 m³ / h each at a nominal pressure of 8 bar. The emergency fire extinguishing pumps, which are electrically driven via the emergency switchboard in the event of a power failure, have a volume flow of 66 m / h. at a nominal pressure of 8 bar. A CO 2 fire extinguishing system will also be installed for the engine room and the cargo holds.
The two bow anchors each weigh around 5 t and the anchor chains are around 310 m (starboard) and around 280 m (port) in length.
|Ship name||Build number||IMO number||delivery||Client||Renaming and whereabouts|
|Hornbay||389||8802002||December 12, 1990||Pluto Shipping Corp., Liberia||in motion|
|Horn cap||390||8802014||June 28, 1991||Pluto Shipping Corp., Liberia||in motion|
|Horncliff||398||8912041||April 16, 1992||Pluto Shipping Corp., Liberia||2017 demolition in Aliağa|
- Karl-Heinz Hochhaus: Deutsche Kühlschiffahrt (1902–1995) , Hauschild Verlag, Bremen, 1996
- Die Deutsche Handelsflotte 1996 , Seehafenverlag Erik Blumenfeld, Hamburg, p. 282.
- The Reefer Register and Reefer Containership Register 1996 , Clarksons Research Studies, London, p. 147.