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US 4,382,421 AGranted
Tube coating apparatus
AssigneeVetco, Inc.
InventorsDavid A. Warren, Edwin D. McCrory, Jr.
Life of this patent
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Abstract
An apparatus for coating the interior of a tube (10) with fusible particles entrained in a flow of air. A measured charge is placed in an unpacked condition within a container (18) temporarily isolated (20) from a first end of the tube. A vacuum is established in the tube and in a tank (34) connected to the second end of the tube. A quick-opening valve (20) thereafter places the container in fluid communication with the first end of the tube.
Claims11
An apparatus for lining a heated tube comprising:
- means for supporting and rotating the tube to be lined;
- a container for holding fusible particles which are to be delivered to said tube;
- a feedpipe connected to said container and sealably connectable to one end of the tube to be coated;
- an imperforate tank having a volume greater than the tube to be coated, and having an inlet connection and an outlet connection;
- a discharge pipe connectable to the second end of the tube to be lined and connected to the inlet connection of said tank;
- a quick-opening valve located in said feedpipe;
- a vacuum pump connected to the outlet connection of said tank;
- sensing means for sensing the level of vacuum within the heated tube;
- and means for quickly opening said quick-opening valve in response to said sensing means when the measured vacuum level reaches a predetermined vacuum level.
6 more elements
Dependencies are inferred from the claim text.