PN 677: Saipem Pipelay Vessel PLV CASTORONE

During February 2007 Navalprogetti was asked by Saipem to provide engineering assistance for the completion of design of PLV. The design of this ship is based on the design already carried out by Navalprogetti for Pipelay S260 in 2006 (see PN 664) as it is evident comparing the longitudinal views of vessels. The ship is under construction in China.

Ship main characteristics are as follows:
Characteristics Value
LOA abt. 280,0 m
LBP266,4 m
B39,0 m
Double bottom height2,50 m
H to Main deck 24,0 m
H to Lower deck (Freeboard deck)15,0 m
Firing line deck height30,0 m/td>
T in operation mode 9,5 m
T in sailing conditions abt. 6,5 m/td>
Speed in transitnot less than 14,00 kn
Pipelay capabilitiesS lay (J lay option)
Crane capacity600 t
Power Plant approximately67.2 MW

In February 2007 Navalprogetti experts conducted, in behalf of Saipem, the resistance and propulsion tests of the ship at KSRI in St. Petersburg. The next step in Navalprogetti work was to review completely the design of hull at bow in order to increase the buoyancy and structural support capacity in that (heavy loaded) area. Consequential to this the length between perpendiculars has been increased from 260 to 266.4 m. In this new part of the ship Navalprogetti designed the structures. Also the whole hull has been faired and fitted in the after part with two structural skegs to support the shaft line (whose preliminary design has also been carried out by us, drawing and scantlings). Furthermore we provided KSRI with 3D surface of the hull for the construction of model used in seakeeping tests. Also a new form and arrangement of rudders has been proposed to and accepted by Saipem. Moreover Navalprogetti designed the mechanical ventilation system in pipe preparation area.

Below a more complete list of documents produced is reported:

  • Body lines
  • Skeg lines
  • Resistance and selfpropulsion tests report
  • Fore Ship Lines
  • Construction frames
  • Hydrostatic Properties
  • Forebody Structures
  • Rudder Arrangement
  • Shell Bossing
  • Shell skeg
  • Tween deck 19200 design
  • Mechanical ventilation in large working areas - One line diagram
  • Specification of mechanical ventilation in large working areas
  • Shaft line scantlings
  • Shaft line arrangement
  • Calculation of pressure losses in exhaus gas piping
  • Technical Specification Shaft Line and Propeller

At the moment Navalprogetti is responsible for the firing line equipment engineering.