Method of installing pre-insulated piping

Details Method of installing pre-insulated piping Method of installing pre-insulated piping

2009-08-19

2011-10-11

Lagman, Frederick L (Department: 3672)

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Supporting, anchoring, or positioning of pipe or cable

C405S184000, C405S154100

Reexamination Certificate

active

08033754

ABSTRACT:
An installation technique is shown for use with a pre-insulated steam piping system having an inner steel carrier pipe surrounded by a layer of foam insulation and then by an outer protective jacket. An expansion loop is used to create an artificial low point in the overall pipeline which allows the pipeline to avoid a buried obstruction without the necessity of increasing the depth of the remaining portion of the pipeline on either side of the loop. The expansion loop has a pair of oppositely arranged side legs which are joined by a cross-leg portion of the loop, the cross-leg portion of the loop being angled downwardly at a predetermined angle, to thereby provide a change in elevation which avoids the buried obstruction in the pathway of the pipeline.

REFERENCES:
patent: 2823701 (1958-02-01), Burk
patent: 6585047 (2003-07-01), McClung, III
patent: 6978807 (2005-12-01), Keyes
patent: 7028717 (2006-04-01), Keyes
patent: 7143788 (2006-12-01), Keyes
patent: 7418979 (2008-09-01), Keyes
patent: 2007/0029008 (2007-02-01), Liu
patent: 2008/0173367 (2008-07-01), Keyes

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