Method for maximizing the sharing of tensile load for cement-sheathed multi-wall pipe
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United States of America Patent
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May 20, 2008
Grant Date -
Dec 20, 2007
app pub date -
Jun 16, 2006
filing date -
Jun 16, 2006
priority date (Note) -
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Abstract
A method for installing a fiberglass or stainless steel liner into a steel casing which results in a reduction of strain on the casing. Conventional means are used to place the liner into the casing and to fill the annular space with cement. Thereafter, maximum design operating pressure on the liner is maintained while the pressure on the annular space is reduced; maintenance of those pressures keep the liner in an expanded state while the grout cures. As a result, the liner shares the load with the casing; pressure from the fluids contained in the system during operation is not transferred to the casing through the grout until the liner's preset internal pressure is reached. The use of the method greatly reduces the possibility of flowline failure.
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