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Earl   AST Forum  

Erection Procedure for tank over 140 ft HEIGHT

Wednesday, August 29, 2018   By: TankCons [1946] 0 Stars
Does anyone know of any special procedures from safety perspective for erection of a tank of 140 in height? We are planning to use jack-up method and wanted to know if any temporary guy ropes would be needed for each shell course to ensure stability during jack-up? Something else as well?

Any thoughts on this?

Yes, I agree this is a seriously abnormal height for a tank. But this is a Thermal Energy Storage tank and there are severe space restrictions. The tank dia is going to be close to 130 ft, but the height is critical here. Going by OSHA, the tallest TES tank in the world was constructed by CBI and its 150 tall. So, this is going to be pretty close. Anyone here knows if CBI did the erection using jack-up or conventional?

Any other concerns that you feel would need to be addressed? FYI, we are in seismic Zone 2B.

Thanks in advance for your thoughts and comments.

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Thursday, August 30, 2018   By: ITS [1678] 4 Stars
I cannot say much about using guy wires for the purpose of comfort when building a 140 foot vertical tank that is about 130 foot in diameter. But, this note might guide you.

The purpose of using guyed wires on a vessel or tank is to restrain the tank or vessel. Bare with me. Guyed wires essentially reduces the size of the foundation including reducing the number of anchor bolts and their size. This is because the guyed anchorage is now consider. But, there are trade off for the wire are a nuisance to say the least.

Using guyed wires for anchorage seems impractical during the building process of the tank.
The idea that the tank is 140 feet tall is not as important as the slenderness ratio of the vessel or tank.

So, how is the soil? Is the soil and foundation supportive enough and are their other structures around the tank to help manage the live loads like wind. Do these other surrounding foundations influence or stabilize the ground where your tank foot print will be located?

Good luck.

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Published on ast-forum.com

 

Featured
Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.
------------------

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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