Hydraulic expansion pre-straining of heat exchanger tubing
US6357114B1 · kind B1 · utility
18Cited by
11References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Nov 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49863
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of hydraulically prestraining the tubes of a once-through steam generator by welding the tubes to their respective tubesheets prior to the application of hydraulic expansion to produce tensile stresses which shorten the tubes an equal and predetermined amount to increase the margin to buckling and increase the natural frequency of the tubes reducing flow induced vibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.