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Fired vertical Radiant Tube

Fired vertical Radiant Tube

Fired vertical Radiant Tube


After inspecting of a fired cylindrical vertical heater, two radiant tubes were dented (mechanical damage)at about the medium length of the tubes (photo attache).

From where does this defect result from? How one can confirm such defect is acceptable to remain for several years until the next shutdown? or when tube replacement is necessary?

Fluid: Water
DT; 180 degrees Celsius
DP: 700Kpa
CA: 1.5 mm
Tube: 6"
Tube material: A106 Gr. B

Have a nice work and day


RE: Fired vertical Radiant Tube

Is that a dent or a buckle?

Has this come from thermal stress?

Acceptability is quite hard to certain. First see if there are any cracks - dye penetrant maybe?

Can you do some hardness checks on the most deformed bit?

A U/T inspection to get actual thickness?

A more exact dimensional check on what this feature is a sit's difficult to see from the photo

Probably good for the life of the heater, but needs a bit more investigation.

Or just plug it off and remove it or isolate it.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Fired vertical Radiant Tube

You said the fluid circulating inside the tubes is water?

please confirm.


RE: Fired vertical Radiant Tube

Yes, water

RE: Fired vertical Radiant Tube


Is there any possibility to have flame impingement?



RE: Fired vertical Radiant Tube


Thanks for the input.

Can we skip the metallographic examination in this case?

Flame impingement had less tendency to occur at the respective areas.


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