Rod accumulator riser tensioning cylinder assembly
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United States of America Patent
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-
Oct 12, 1993
Grant Date -
N/A
app pub date -
Jul 13, 1992
filing date -
Jul 13, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A 'rod accumulator' riser tensioning cylinder assembly for use with off-shore production and exploratory drilling facilities. The tensioner is basically a hydro-pneumatic spring having a tubular cylinder equipped with a hollow rod containing sufficient volume to act as an accumulator. The rod is internally ported to the annulus of the cylinder. The cylinder exterior is coated with a material that will insulate the unit when exposed to high temperature and flame. A wear sleeve is supplied over the insulation material to provide a low friction surface for an outer, cylindrically shaped rod insulation jacket to slide over the cylinder when the rod is stroked into the cylinder. When the rod is stroked out, the jacket is also extended, protecting the rod from flame and high temperature due to its insulative properties. This is a low mass and low volume system, with low lateral area so that an increased number of such cylinder assemblies can be provided in a given horizontal area.
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