Blisters in firetube boilers
Blisters in firetube boilers
(OP)
What causes a blister in the furnance tube of a firetube boiler. I know it is due to plate lamination but what causes the blister after 20 years of service with no problems ?
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Blisters in firetube boilers
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RE: Blisters in firetube boilers
3.4.7 BULGES AND BLISTERS
a) A bulge may be caused by overheating of the entire thickness of the metal, thereby lowering the strength
of the metal which is then deformed by the pressure. Bulges may also be caused by creep or temperature
gradients.
b) A blister may be caused by a defect in the metal, such as a lamination, where the side exposed to the fire
overheats but the other side retains its strength due to cooling effect of water or other medium. Blisters
may also be caused by a hydrogen environment (See NBIC Part 2, 3.4.5).
So, you may have blisters that formed from an event and if the event is not repeated, they could be dormant in service. However, this requires careful evaluation.
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers
RE: Blisters in firetube boilers