公开(公告)号：US20180022422A1

公开(公告)日：2018-01-25

申请号：US15549450

申请日：2016-02-09

Applicant: Saipem S.p.A.

Inventor： Valerio BREGONZIO ,  Cristian SCAINI

IPC: B63B22/04 ,  C25D3/44 ,  B63B43/14

CPC classification number: B63B22/04 ,  B63B43/14 ,  C23C18/1635 ,  C23C18/1653 ,  C23C18/22 ,  C23C18/32 ,  C23C18/38 ,  C25D3/44 ,  C25D5/18 ,  C25D7/006 ,  E21B17/012

Abstract: A buoyancy device (1) comprises a support structure 2, 4 which can be connected to an underwater application (3) and one or more buoyancy spheres (4) having a specific weight of less than 500 kg/m3 connected to the support structure (2) and having a light metal spherical shell (5) defining a spherical inner volume (6) and which has an outer diameter (d) greater than 0.5cm, and a radial thickness (t) greater than 0.08mm, wherein the spherical shell (5) is obtained in one piece in nano-crystalline metal with an average grain size of less than 1000 nanometers.