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Re: Report on the 844 tube failure
Author: Bob Williams
Date: 08-23-2019 - 21:06

Seal welding of the joint between the tubes and the rear flue sheet after they had been rolled caused a gap to open on the water side of the joint. That combined with excessive free oxygen in the water supply caused accelerated corrosion of the tubes, ultimately resulting in tubes failing just ahead of the flue sheet.

Recommended corrective measures include lightly re-rolling the tubes after seal welding to close the gaps, and implementing better water quality control. There was no evidence of excessive rolling.

[www.kbsteam.com]

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Subject Written By Date/Time (PST)
  Steam loco with a failure something blew 08-22-2019 - 22:21
  Re: Steam loco with a failure RWS 08-22-2019 - 23:32
  Re: Steam loco with a failure Sum ting wong 08-23-2019 - 08:22
  Re: Steam loco with a failure HUTCH 7.62 08-23-2019 - 09:59
  Re: Steam loco with a failure Hot Water 08-23-2019 - 10:54
  Re: Steam loco with a failure David Dewey 08-23-2019 - 18:23
  Re: Report on the 844 tube failure Bob Williams 08-23-2019 - 21:06
  Re: Report on the 844 tube failure David Dewey 08-24-2019 - 22:37
  Re: Steam loco with a failure I know 08-25-2019 - 14:38


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