Heave compensation apparatus for a marine mining vessel
US3943868A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Jun 13, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/09
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ship in which a string of heavy pipe is raised or lowered vertically beneath the ship at a substantially constant velocity in spite of heaving movement of the ship. The equipment for raising and lowering the pipe string is supported by the vessel through heave compensation means that permits vertical movement of the ship relative to the pipe raising and lowering mechanism. The heave compensation means is a passive damped pneumatic-hydraulic spring system for isolating the vertical movement of the ship from the pipe raising and lowering equipment. The spring system operates over a very wide range of load imposed by the raising, lowering and supporting of a very long heavy pipe string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.