LA NAVAL Y LA RÍA

(Autor: Juan José Alonso Verástegui)

A las 16,30 horas del 9 de julio de 1917 la jovencísima madrina Carmen de Zubiría rompía la botella en la proa del vapor Conde de Zubiría en la ceremonia de la primera botadura del astillero de la Naval en Sestao. Para entonces la Compañía Euskalduna ya tenía a flote su construcción nº 39, el vapor escuela Artagan Mendi para Sota y Aznar, que lucía en su popa un mascarón de la Virgen de Begoña. Había sido lanzado al agua el 9 de junio en una muy feliz y festejada botadura en las anteriores mareas vivas, inaugurando también grada. En la del Conde de Zubiría hubo problemas con los sebos de las imadas y el barco se paró a mitad de trayecto y continuó hacia el agua 4 horas después cuando ya se habían marchado todos los invitados. Sufrió una avería en el casco y una copla que le hicieron los bilbaínos:

Ship tonnage: Its use and  an aproximate calculation method.

DEFINITIONS


The concept of ship tonnage is related to her size or volume, but it is not a physical particular than can be expressed in any measurement unit, but it is the result of some calculations performed with the ship's dimensions by applying a set of agreed rules.


Until recent times the words ship tonnage were suggesting that they referred to a weight when actually it is a volumetric concept. Ship tonnage nowadays is adimensional.


There are three tonnage classes: Gross, Net and Compensated gross

La Naval shipyard, of the Spanish shipbuilding group CNN builds a fall pipe type ship 

Last February La Naval shipyard, from Sestao, near Bilbao, launched the ship "Simon Stevin", of fall pipe type, having a double mission, rock dumping in water depths up to 1.700 m, and, at the other hand, deep water mineral mining. Rock dumping is devoted to marine works such as protection of submarine cables and pipes, sea bottom refilling in underwater works, etc.



This type of ship is a new one in Spanish shipbuilding and only a few of them are in operation worldwide.

La Naval from Sestao builds the world biggest suction trailing dredge

The dredge, named "Cristobal Colón", was contracted by the belgian company Jan de Nul Group, to be built by Constructores Navales del Norte (CNN) in their shipyard at Sestao, Spain, where, at present, they are ultimating her outfitting.

Main dredge particulars:

Cargo hopper capacity 46.000 m3
Deadweight 78.000 Tm
Total length 223,00 m
Breadth 41,00 m
Load draugth 15,15 m
Suction pipe diameter 1.300 mm
Maximum dredging depth 155,00 m
Propulsion power 2 x 19.200 Kw
Pumping output at dredging 2 x 6.500 Kw
Pumping output at discharging 16.000 Kw
Total diesel installed power 41.500 Kw
Speed 18 knots
Accommodations for 46

Here you can see some photos of the dredge in the yard