Settlement of hydro test tanks - allowable limt

[Narasimha Rao]

Hi All,

 

       I Would like to know how much settlement allowed during hydro test of floating roof tank.

       

        At my site, the tank foundations are placed on concrete pilings due to soft soil conditions.. Piling depth around 22 mtrs from ground level. Tank dia 40 Mtrs. Height 18 mtrs. Even after strong piling for every one meter distance ( pile to pile, pile dia 600mm).Around 150 piles layed below the tank foundation. During hydro test of tanks we observed at one side settlement around 100mm observed.

       

        What is the allowble settlement for tanks with piling and without piling foundations.In which API code mentioned.

 

       

 Regards.

 

K V Narasimha Rao

Sr. Principal Engineer

IRS - TPI

 

[Aron Luke]

Dear Mr. Narsimharao,

650 is silent on the acceptable limits of settlement.  It does say, however that if settlement measurements are specified by the Purchaser, any differential settlement greater than 13 mm per 10 m (1/2 in. per 32 ft) of circumference or a uniform settlement over 50 mm (2 in.) 

 

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Aron Luke G

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[Dr-alaa Zg]

Dear Mr. K V Narasimha Rao I think you have to ask the designer engineer of tanks, he is already documented the allowable deformation according to the standards that followed. Other than, I think I need a details of the tanks design to help you in determining the deformation allowances.. Accept my profound regards…   Dr. Eng. Alaa A. Atiyah --- On Fri, 7/6/12, Narasimha Rao <narasimh...@gmail.com> wrote:

[Muthu Samy]

Dear Rao,
Any uniform (50 mm) or differential (13 mm) settlement noticed over than the value to be informed to the purchaser. There is no acceptance criteria.

 

Muthusamy@balu
QA/QC Manager

Lima Heavy Industries

UAE
00971558580689

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