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Title: Double wall vacuum tubing and method of manufacture

Abstract

An evacuated double wall tubing is shown together with a method for the manufacture of such tubing which includes providing a first pipe of predetermined larger diameter and a second pipe having an O.D. substantially smaller than the I.D. of the first pipe. An evacuation opening is then in the first pipe. The second pipe is inserted inside the first pipe with an annular space therebetween. The pipes are welded together at one end. A stretching tool is secured to the other end of the second pipe after welding. The second pipe is then prestressed mechanically with the stretching tool an amount sufficient to prevent substantial buckling of the second pipe under normal operating conditions of the double wall pipe. The other ends of the first pipe and the prestressed second pipe are welded together, preferably by explosion welding, without the introduction of mechanical spacers between the pipes. The annulus between the pipes is evacuated through the evacuation opening, and the evacuation opening is finally sealed. The first pipe is preferably of steel and the second pipe is preferably of titanium. The pipes may be of a size and wall thickness sufficient for the double wall pipe to be structurallymore » load bearing or may be of a size and wall thickness insufficient for the double wall pipe to be structurally load bearing, and the double wall pipe positioned with a sliding fit inside a third pipe of a load-bearing size.« less

Inventors:
 [1];  [2];  [2]
  1. Scotia, NY
  2. Houston, TX
Publication Date:
Research Org.:
CARBOTEK INC
OSTI Identifier:
867157
Patent Number(s):
US 4876780
Assignee:
Carbotek, Inc. (Houston, TX)
DOE Contract Number:  
AC02-87ER80447
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
double; wall; vacuum; tubing; method; manufacture; evacuated; shown; providing; pipe; predetermined; larger; diameter; substantially; evacuation; inserted; inside; annular; space; therebetween; pipes; welded; stretching; tool; secured; welding; prestressed; mechanically; amount; sufficient; prevent; substantial; buckling; normal; operating; conditions; preferably; explosion; introduction; mechanical; spacers; annulus; finally; sealed; steel; titanium; size; thickness; structurally; load; bearing; insufficient; positioned; sliding; fit; third; load-bearing; thickness sufficient; load bearing; wall thickness; operating conditions; double wall; amount sufficient; annular space; larger diameter; operating condition; space therebetween; normal operating; wall vacuum; /138/29/

Citation Formats

Stahl, Charles R, Gibson, Michael A, and Knudsen, Christian W. Double wall vacuum tubing and method of manufacture. United States: N. p., 1989. Web.
Stahl, Charles R, Gibson, Michael A, & Knudsen, Christian W. Double wall vacuum tubing and method of manufacture. United States.
Stahl, Charles R, Gibson, Michael A, and Knudsen, Christian W. Sun . "Double wall vacuum tubing and method of manufacture". United States. https://www.osti.gov/servlets/purl/867157.
@article{osti_867157,
title = {Double wall vacuum tubing and method of manufacture},
author = {Stahl, Charles R and Gibson, Michael A and Knudsen, Christian W},
abstractNote = {An evacuated double wall tubing is shown together with a method for the manufacture of such tubing which includes providing a first pipe of predetermined larger diameter and a second pipe having an O.D. substantially smaller than the I.D. of the first pipe. An evacuation opening is then in the first pipe. The second pipe is inserted inside the first pipe with an annular space therebetween. The pipes are welded together at one end. A stretching tool is secured to the other end of the second pipe after welding. The second pipe is then prestressed mechanically with the stretching tool an amount sufficient to prevent substantial buckling of the second pipe under normal operating conditions of the double wall pipe. The other ends of the first pipe and the prestressed second pipe are welded together, preferably by explosion welding, without the introduction of mechanical spacers between the pipes. The annulus between the pipes is evacuated through the evacuation opening, and the evacuation opening is finally sealed. The first pipe is preferably of steel and the second pipe is preferably of titanium. The pipes may be of a size and wall thickness sufficient for the double wall pipe to be structurally load bearing or may be of a size and wall thickness insufficient for the double wall pipe to be structurally load bearing, and the double wall pipe positioned with a sliding fit inside a third pipe of a load-bearing size.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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