Stress diffuser

  • Inventors:
  • Assignees: Mobil Oil Corporation
  • Publication Date: September 04, 1979
  • Publication Number: US-T986007-I4

Abstract

means are provided for diffusing stresses, particularly in couplings between vertical heater tubes 2 and the connection to a tube (pigtail) 3 leading to a manifold, arising from temperature changes during start-up or shut-down, bending moments and vibration during operation. The stress diffuser may be installed at the connection of the manifold connection such as a "pigtail", to a heater tube and is constituted by a short tube 1 machined to varying inside diameter (preferably constant OD) by tapered wall thickness from a mid-section of maximum wall thickness to lesser wall thickness toward the ends of the stress diffuser. For ease of repair and replacement, the stress diffuser is fitted in a collar 4 on the heater tube.

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    EP-0161815-A1November 21, 1985THE BABCOCK & WILCOX COMPANYMéthode pour remplacer des tubes dans un collecteur ou un réservoir
    EP-0704651-A1April 03, 1996Rockwell International CorporationBuse pour tube ayant réduction des efforts transitoires thermiques