TGN-PE-03 Cracking in Fire Tube Boilers - ATHRA
joints in drums, shells, headers, pipes, and tubes; any welded butt joint within a sphere or within a formed or flat head or tubesheet; and welded butt joints attaching insert‐nozzles of the type shown in Figure PW-16.1, illustrations (q‐1) through (q‐4). The National Board of Boiler and Pressure Vessel Inspectors 15
May 04, 2009 · Erosion. Fire side corrosion (Called also as High temperature Corrosion) Lack of quality control. These lead to twenty-two primary causes that can cause a tube failure in a high pressure boiler: Short term overheating failure. Long term overheating failure (called also as creep failures) Dissimilar metal weld failure.
Tube Failures in High Pressure Boilers - Bright Hub
400°C. Tube plate cracking typically starts at toes of boiler tube fillet welds and grows across the tube plate ligament from one boiler tube to another. Cracking has also occurred from centre-pop marks forming a small notch in the edge of the tube hole with expanded tubes. Ligament cracking is serious. Depending on the age and fracture toughness of the tube plate, material crack extension can occur
The boiler tubes are under high pressure and/or high-temperature conditions. They are subject to potential degradation by a variety of mechanical and thermal stresses and environmental attack on both the fluid and fireside. Mechanical components can fail due to creep, fatigue, erosion, and corrosion
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Sep 04, 2006 · This sounds like a firetube boiler. If so you probably have a build up on the waterside that allowed the tubesheet/plate to be become overheated and crack. We used to call them "firechecks",tough to weld repair as it is full of residue and the carbon may be cooked out. Suggest you tear all the tubes and check the sheets after a good cleaning.