Semisubmersible vessel with forward-mounted crane

Details Semisubmersible vessel with forward-mounted crane Semisubmersible vessel with forward-mounted crane

1995-03-15

1996-09-24

Avila, Stephen

Ships

Floating platform

212309, B62B 2700

Patent

active

055580378

ABSTRACT:
A drilling tender (2) has a pair of laterally spaced buoyant hulls (4) with ballast chambers to permit the hulls to be moved between a submerged condition and a surface floating condition. Each hull (4) supports a row of columns (8). The columns (8) support a working platform (10) including a main deck (12) and a pipe rack deck (30) above the main deck (12). A bow deck (48) above a forward portion of the pipe rack deck (30) has mounted on a corner portion thereof a main heavy duty crane (50). The support structure for the crane (50) extends downwardly through the decks (12, 30, 48) and down into one of the columns (8). Between the main and pipe rack decks, the support structure is formed by a plurality of bulkheads. These bulkheads have portions extending down into the column (8) to transmit forces created by operation of the crane (50) to the column (8). A personnel bridge (80) is pivotably mounted on the bow deck (48) to allow its free end to be pivoted onto a fixed-position work platform being serviced by the tender (2). An auxiliary crane (70) is mounted on the pipe rack deck (30) rearwardly of and laterally opposite the main crane (50).

REFERENCES:
patent: 3685305 (1972-08-01), Lloyd, III
patent: 3835800 (1974-09-01), Lloyd, III et al.
patent: 3894503 (1975-07-01), McClure
patent: 4165702 (1979-08-01), Lloyd, III et al.
patent: 4207828 (1980-06-01), Horowitz et al.
patent: 4231313 (1980-11-01), Heerema et al.
patent: 4232625 (1980-11-01), Goren et al.
patent: 4281615 (1981-08-01), Wilson et al.
patent: 4385583 (1983-05-01), Ayers
patent: 4417664 (1983-11-01), Gordon
patent: 4471708 (1984-09-01), Wilson et al.

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