IFR air raise calcs

[jimbobNTL]

I did the calculations on a IFR we are planning to air raise in a couple months. Its 110' diameter with a combined weight of 250.59t. I came up with 302 mm h20. can someone verify my numbers are correct?

Also, I'm trying to source fans for the project. i cant seems to find ones that meet the requirements. Would anyone be willing to share a link to where i may find what I'm looking for?

I've been part of many air raising projects, but this is my first time on calculation and set up side of it.

thank you

 

[LittleInch]

Define what is "t"

Short ton, long ton or metric tonne.

Seems to be about right but define this first.

I suspect you need a "blower" not a "fan", so search for that instead.

Air raising or "hair" raising....?

 

[goutam_freelance]

It appears this is a huge fan with 302 mm H2O fan head.

TLT fans is a company supplying FD/ID fans for coal power plants which look similar in size and rating.

Howden is another company.

 

[HTURKAK]

Its 110' diameter with a combined weight of 250.59t.

My points,
- Check your figures . If i had designed a tank having dimensions 33D X 10 H and if the total weight were 250 metric tons , my boss surely would fire me.
- What is the reason for air lift ? can you provide a sketch of the proposed IFR ?

 

[Geoff13]

At 250 tons and 110 ft diameter that's 26 psf. A standard 3/16" steel deck is only 8 psf. What does your IFR look like to be so heavy?

Next, 26 psf is only 5" (125 mm) water column. How did you arrive at 12" (300 mm) WC? A more reasonable weight will reduce this pressure even further.

Air raising a floating roof is a piece of cake (with the right tools and procedures). I remember being on one and helping drop/pin the legs in 1981.

 

[LittleInch]

At 250 tons and 110 ft diameter that's 26 psf. A standard 3/16" steel deck is only 8 psf. What does your IFR look like to be so heavy?

Next, 26 psf is only 5" (125 mm) water column. How did you arrive at 12" (300 mm) WC? A more reasonable weight will reduce this pressure even further.

Air raising a floating roof is a piece of cake (with the right tools and procedures). I remember being on one and helping drop/pin the legs in 1981.

I get nearly 59 psf....

But agree its a heavy roof. Double skin?

 

[Geoff13]

I get nearly 59 psf....

Oops, I did kips instead of tons, so double my numbers. Thanks.

Crazy heavy either way.