Tubular bodies and methods of forming same
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United States of America Patent
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Jun 27, 2017
Grant Date -
Oct 30, 2014
app pub date -
Oct 31, 2012
filing date -
Nov 1, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a tubular article (10), such as may be used as an oil and gas pipeline, having a longitudinal axis X comprising inner and outer separate strips (12, 14) of spirally wound overlapping material each having a longitudinal axis L and first and second edges (16, 18, 16′, 18′), in which each strip (12, 14) comprises two or more longitudinally extending ridges (20, 22, 20′, 22′), each of which extends along said longitudinally extending axis L in parallel to each other and in which said ridges (20, 22, 20′, 22′) each comprise asymmetric ridges having a leading edge (24, 24′) forming a contact portion (28, 28′) and wherein said leading edges (24, 24′) are each in contact with each other and further comprising a non-contact trailing edge portion (26, 26′) which are spaced from each other by an amount G.
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