Experimental assessment of thermal grain boundary embrittlement after tubeplate failure in a petrochemical heat exchanger

Otegui, J.L.; Booman, J.; Massone, Juan Miguel

doi:10.1016/j.engfailanal.2017.04.022

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The design of tube-to-tubesheet joints varies widely depending on the severity of the service conditions [ 5 ]. They can be made by tube expansion, by welding, or by a combination of welding and plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Weld defects during the manufacturing stage can be the cause of many failures in service, due to the presence of porosity, inclusions, lack of fusion and penetration, shrinkage cracks or internal stresses [ 12 ]. Therefore, the selection of appropriate base and weld material, process parameters, performance of the welding, application of heat treatments and release of mechanical stresses are well known factors that generally speaking must be taken into account [ 5 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Otegui et al [ 5 ] analyzed and discussed the causes of multiple cracks found in a heat exchanger tubesheet at a petrochemical plant, which had been repaired several times. The analysis they performed showed embrittlement of the heat affected zone (HAZ) of the welds, and a lack of penetration and fusion at the weld roots.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Tube-to-Tubesheet Welding in Carbon Steel Heat Exchangers of a Double Plate Header Box

González¹,

Hernández‐Ortega

Jiménez

et al. 2021

Materials

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The rear wall of the header box serves as a tubesheet in heat exchangers of double plate header box. Tube-to-tubesheet welding must be performed using orbital Gas Tungsten Arc Welding (GTAW) with a head extension, which is passed through the corresponding hole in the front wall (plugsheet) of the header box, where the welding machine is supported. In this project, the effect of parallelism deviations between the plugsheet and the tubesheet of carbon steel header box is analyzed to evaluate its influence on the quality of the tube-to-tubesheet welding. Welded tube (SA-210 Gr. A1) to tubesheet (SA-516 Gr. 70) coupons are manufactured simulating the parallelism deviations previously analyzed in two double plate header boxes of air-cooled heat exchangers using two different preheating temperatures. Macrographic analysis is performed in order to evaluate the weld penetration (minimum leak path) and length of the weld leg in tube-to-tubesheet joints. The results obtained show important variations in those parameters when the parallelism deviations are equal to or greater than −1 mm over the theoretical distance as well as when the distance approaches +1 mm or more. Finally, the incorporation of dimensional controls prior to the welding process is discussed and the implementation of improvements in orbital GTAW equipment is recommended as an optimal solution for this kind of heat exchangers.

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Section: Introductionmentioning

confidence: 99%