M. & B. Benetti Shipyards, Viareggio, Italy, delivered this sophisticated 12,000-dwt chemical carrier to Carbocoke S.p.A. di Navigazione of Palermo. The Marigola's propulsion—a G.M.T. CC 600.5 engine—is the pioneer commercial application of the new G.M.T. low-speed diesel.
The engine produces 8,250 hp at 250 rpm, driving a four-blade controllable-pitch propeller through a gearbox having a 2.083:1 reduction ratio. A power takeoff from the gearbox drives a 750-kw Ansaldo generator. The auxiliary machinery consists of two G.M.T. BL 230.6 diesel engines, each developing 1,225 hp at 900 rpm.
The Marigola has 22 cargo tanks — eight center stainless-steel and 14 wing tanks coated with Rustban 191. The ship can load and unload three different products simultaneously. All the tanks are fitted with stainless-steel coils; the center tanks having AISI 316L Mos grade coils.
Each tank has its own piping and pumping system. There are 22 hydraulically powered submersible pumps, 16 of which are Termomeccanica Italiano CDVS 100s with a 80 m3/h capacity at 80 m head, and six are CDVS 150s with a 150 m3/h at 110 head. The stainless-steel pumps are fed by a hydraulic station supplying 960 kw of power.
Hydraulic power units are remotely controlled through two control panels arranged in a small room on the main deck. One panel is hydraulic and permits the readout and adjustment of the pressures; the other is electric and allows control of the main functions of the cargo plant.
The deck machinery, manufactured by the Benetti yard, consists of two hydraulic self-tensioning windlasses, two hydraulic self-tensioning warping capstans of nine-ton capacity, and four 4-ton hydraulic windlasses for Great Lakes service. Other deck gear includes two 3.5-ton landing booms, a hydraulic davit two-ton at 11.5 m and a portable davit for the portable pumps. The electrohydraulic steering gear is a Frydenbo type HS 181D set.
The wheelhouse is equipped with two Decca radars (type RM 1226C) with plotting, azimuth stabilizer, and performance monitor; Decca satellite navigator, type D53; Plath Angulus radio direction finder with homing system; Kelvin Hughes echosounder; and Microtecnica Sirius Mk 2 gyrocompass. A Dancom HF 1200 radio station is installed in the communications room.
According to AMLICO of Stamford, Conn., exclusive U.S. representative of G.M.T., the Marigola's hull was designed by the shipyard with a view to achieving the best performance, service speed, maximum tank volume, and deadweight to meet owner requirements. The design was tested extensively in ship model basins in Vienna and Rome.
The chemical carrier was classed by Registro Navale Italiano, meeting all IMCO, SOLAS, and U.S. Coast Guard requirements.