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Stress diffuser |
| T986007 |
Stress diffuser
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| Inventor: |
Papia |
| Date Issued: |
September 4, 1979 |
| Application: |
05/879,656 |
| Filed: |
February 21, 1978 |
| Inventors: |
Papia; Joseph D. (Torrance, CA)
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| U.S. Class: |
122/360 |
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| 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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