Stress diffuser
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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Description
Patent History
Patent number: T986007
Type: Grant
Filed: Feb 21, 1978
Date of Patent: Sep 4, 1979
Assignee: Mobil Oil Corporation
Inventor: Joseph D. Papia (Torrance, CA)
Application Number: 5/879,656
Type: Grant
Filed: Feb 21, 1978
Date of Patent: Sep 4, 1979
Assignee: Mobil Oil Corporation
Inventor: Joseph D. Papia (Torrance, CA)
Application Number: 5/879,656
Classifications