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US 5,706,869 AGranted
Filling the annulus between concentric tubes with resin
AssigneeAcoust-A-Fiber Research and Development, Inc.
InventorsJerry M. Wolf, Hiten T. Shah, Steven J. Crosbie, James D. Crosby
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Abstract
Concentric conduits are supplied for the purpose of minimizing heat transfer from within the inner conduit through the outer conduit. The air gap or annulus around the inner conduit is filled with a resin mixture which is mixed with vermiculite and mineral fiber to form a slurry. The slurry is pumped into an open end of the annulus to fill the annulus and enhance the heat insulation characteristics of the concentric conduits.
Claims11
A process of filling the annulus between concentric conduits with fluid material comprising,
- providing concentric conduits secured together at one end and being of similar length, a bridge blocking the passage of fluid through said annulus where said conduits are secured together, said conduits terminating at a location remote from said bridge and forming an open inner passage in said inner conduit and an open annulus between said conduits,
- forming a bleed hole in the outer of the concentric conduits, said hole being near said bridge,
- inserting the discharge end of a nozzle into said open inner passage,
- injecting fluid material into said nozzle through a feed opening,
- blocking flow of said material from said nozzle into said open inner passage,
- discharging said fluid material from said nozzle only into said open annulus,
- exhausting any gaseous material in said annulus through said bleed hole while said fluid material flows in said annulus along said conduits toward said bridge, and
- determining when said annulus is full of said material by observing the discharge of fluid material through said bleed hole.
5 more elements
Dependencies are inferred from the claim text.