Determining if heat exchanger met ASME, AISC and other code design criteria
We performed vibration, shock and lifting load analysis of a shipboard heat exchanger to determine if it met ASME, AISC and other code design criteria. Because the supported exchangers are shipboard equipment, the American Bureau of Ships (ABS) requires that they be analyzed for stresses caused by motion loads.
The unit was specified to maintain vibration conditions defined in MIL-STD-167-1 for frequencies up to 50 Hertz. A modal analysis was conducted to identify natural frequencies under 50 Hertz, and to confirm there were no frequencies in the range of 0 to 33 Hertz, with the exception of rigid body movement of the unit on the vibration isolation springs. The results of a modal analysis with a finite element model revealed seven natural frequencies below 33 Hertz.
A finite element analysis (FEA) of the unit was conducted for static shock loading, using the following assumptions:
1) Isotropic, linear elastic material behavior is assumed with small displacement theory.
2) Stresses in the vibration spring isolators are acceptable for the applied loads.
The finite element model of the unit was subjected to a vertical shock load of 18.5g and horizontal shock loads of 5.1g. The loads were applied independently of each other. The maximum stresses in all of the unit’s structural components and fasteners were found below the allowable stress limits.
We perform design and (stress, vibration and shock) analysis to codes including AWS, API and ASME.
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