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2009-10-24 · I would also lightly grind some clear areas on the bundle face, if that's where the crack is the widest, and immediately do a PT test while the metal is warm. If possible I would look at the shell side to the tube sheet. Could you comeback with a little more information on your tubesheet\tube bundle design and physical conditions.
2019-7-31 · In order to determine the cause of a transgranular failure, it is necessary to study both the design and the operating conditions of the boiler. Straight tube, shell-and-tube waste heat boilers frequently develop tube and tube sheet failures due to the imposition of unequal stresses.
2017-9-21 · A REVIEW OF THE COMMON CAUSES OF BOILER FAILURE IN THE SUGAR INDUSTRY K B MCINTYRE Alstom Power - John Thompson Boiler Division, Cape Town, South Africa the crack will run into and through the ligaments resulting in costly replacement of the tube sheet. The ends of the furnace tube/flue can also suffer from thermal fatigue in a similar manner.
2016-4-7 · Cracking in fire-tube boilers at welded joints is a frequent, costly and potentially dangerous occurrence. The shortest recorded time for serious cracking to leak is 3 years, representing less than 20,000 cycles, and occurred on a laundry boiler subjected to frequent and rapid firing.
Tube ends that are projecting beyond the tube sheet more than the Code allows can overheat and crack. If the tubes are attached to the tube sheet by welding, cracks in the tube ends can propagate to the tube sheet, and possibly run into the ligaments between the tubes. A tube sheet can easily be damaged beyond repair with cracks of this nature
2019-5-22 · (f) Cracks may be welded between tube holes in the shell of water tube boiler drums, provided there are not more than two cracks in any one row in any direction, nor more than a total of four cracks in a drum, and further provided the welding meets the requirements of this subchapter for Class I welded pressure vessels and is approved by the
2017-1-11 · of the tube sheet. To avoid this issue, the boiler should never be operated outside its own design specifications for temperature and pressure. Steam Blanketing. Steam blanketing is a phenomenon in which steam and water separate and flow through a given tube in separated
The boiler rear tube sheet appeared visually acceptable and was initially considered safe by others. However, the boiler rear tube sheet was found to have a reduction in boiler plate strength and the boiler plate microstructure changed and that was consistent with moderate to long term localized elevated temperatures in the ASME carbon steel
2017-8-6 · Boiler tube sheet. by Poland308 » Fri Aug 04 kinda seems like with thermal movement from cold start up & dramatic thickness difference between tube plate & tubes they're going to crack - I seen emergency welded repairs to keep an old boiler going but not on this scale. Going to let our weld engineers decide if they want try cutting out