Investigation of Stress Conditions in a Full-Size Welded Branch Connection

This paper presents the results of an investigation of stress conditions in an 8-in.-diam, 0.500-in.-wall test manifold having a full-size welded branch connection. Stresses were determined from strain-gage measurements on the outer surface of the manifold at some 50 stations in the vicinity of the...

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Bibliographic Details
Published in:Journal of fluids engineering 1938-07, Vol.60, p.399-410
Main Authors: Everett, F. L., McCutchan, Arthur
Format: Article
Language:English
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Summary:This paper presents the results of an investigation of stress conditions in an 8-in.-diam, 0.500-in.-wall test manifold having a full-size welded branch connection. Stresses were determined from strain-gage measurements on the outer surface of the manifold at some 50 stations in the vicinity of the welded juncture of header and branch. High stresses were found to exist on the outer surface at the flat portion on the side of the manifold. No evidence of high stress was found on the outer surface of either the unreinforced or reinforced manifold in the vicinity of the crotch, although high stresses were deduced analytically as probably existing in the inside wall at this location in the unreinforced manifold. The ring-type of reinforcement was found to assume its share of the load in the region which it covered but to have little significant effect on adjoining areas, even increasing the measured strains where the ring joined the header at the side of the manifold. While permanent distortion occurred at the sides of the reinforced manifold at a pressure only 70 per cent of the pressure calculated to cause yielding of the pipe proper, eventual failure occurred in the header outside of the reinforced region at a pressure approximately the same as would be expected to burst a straight length of pipe. It is concluded that the ring type of reinforcement described herein will develop the full strength of the pipe.
ISSN:0098-2202
1528-901X
DOI:10.1115/1.4020772