Failure of boiler tubes 2

Short term overheat (stress rupture) caused by total or partial blockage within the tube circuit.

Checkout the picture in the short term overheat section.

Keep in mind that it doesn't have to look exactly like this photograph. There can be any ammount of distortion as long as it looks like a "Fish Mouth".

That is a great link UncleSyd. I'll bookmark that one.

Cheers.

overheating schema



long term overheating (on short term overheating the edges of the fish mouth are thinner)




creep schema



creep failure



luis marques

A 293-page book of material (with lots of color photos) as shown by 0707 and in unclesyd's link is
The NALCO Guide to Boiler Failure Analysis ISBN: 0070458731 (1990). "Description: This book illustrates and explains virtually all common failure modes which adversely affect boiler reliability. Each failure mode is well illustrated with case histories. The corrective steps necessary to reduce or eliminate each failure type, as well as precautionary notes, are provided. The book is a comprehensive, authoritative field guide for the identification and elimination of boilure failures. Boilers of virtually all pressures and many construction designs are presented."