Tube Thickness of a Boiler

[Aamir Sohail]

`Dear Colleagues,
Is there any formula to know the normal and minimum required thickness of tubes of a boiler e.g. I know the design and normal pressures, media which is to be passed through the tubes and the temperature.
Secondly, I want to know, out of flue gasses and water/steam, which one is erosive in boilers?
I will be very thankful for the support.

 

[RJW000]

See ASME BPVC Section I

 

[MJCronin]

Ahmir

Since this is obviously your first job dealing with a vast subject (boilers, heat transfer, Codes and Standards)you have a long way to go.

There are many different calculations of minimum wall thicknesses of modern boilers as there are many different types of boilers and many different types of boiler components.

Calculation of superheater tubes is different than downcomers which are, of course different than economizer tubes.

You ask: I want to know, out of flue gasses and water/steam, which one is erosive in boilers?

The answer, of course, is both, but it depends ....

http://www.123seminarsonly.com/Seminar-Reports/043/17054124-Boiler-Basics.pdf

...

https://www.aiche.org/sites/default/files/docs/pages/boiler_project_fundamentals.pdf

What, exactly are you trying to accomplish ?

Do you have any experience with combustion, heat transfer or boiler design ? ..... Are you an engineer ?

We have to establish a basis of knowledge before a fruitful and productive discussion can occur.

Tell us more




MJCronin
Sr. Process Engineer

 

[Aamir Sohail]

Dear MJCronin,
Yes I am a mechanical Engineer but I am not specialized to Boiler Design. I am a maintenance engineer of all static and rotary machinery.
Regarding the thickness of the tube, an HRSG of 210 tonn/hr capacity is installed at our site. We have tube leakages issue in our Condensate Pre-heater Section. The thickness of the tubes is 2.4 mm with an tube OD of 38.1 mm. The maximum design pressure is 23 barg. I wanted to calculate if there is any issue with the tube thickness or not.
Secondly, I asked it for my better understanding how tubes are eroded. As our HRSG is water tube and due to velocity of water inside the tube, erosion occurs. Sometime, we call it FAC, sometimes I also get confused in it. But I would like to know how fuel gasses erode tubes.
Best Regards