Steel Stacks Canopy Practices

[Fizza453]

I am looking for some good engineering practices for canopy of steel stacks like
What shall be the diameter of canopy if stack diameter is 3000 mm?
What should be height of the canopy ?
and what are other considerations for canopy dimensions and design?




Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

 

[IROK]

Hi I'm unsure what you mean by canopy but assume that you are referring to the base section of the chimney? There is a code for chimney structural design called the CICIND code.It is produced by the international committee on industrial chimneys. I have used it to design steel chimneys and is very good.

 

[vpl]

Fizza (Nasir)

I took "canopy" to mean a structure open on the sides but covered from the top that would prevent rain or snow from getting on the pipes.

Here in the midwestern USA, we often get rain and snow that blows "sideways" as well as straight down. Therefore, canopies don't do much good. However, sometimes things are covered by a tarp -- a impermeable sheet that covers the material completely and is tied down so it doesn't blow away. Sometimes two or three of them are used, depending on what's being covered. The size is basically "big enough to cover what you want covered.

Patricia Lougheed

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[Fizza453]

Patricia Lougheed,

Yes you are correct, I take canopy in the meaning of the top cover that is suspended at the top of stack by means of some supports welded to stack shell, it acts as a rain hood. Here in Pakistan, no snowfall.


Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN