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Join Date: Nov 2011
Posts: 20

### Calculate a Tank With API650

06/15/2012 4:33 PM

hello

i want to calculate a tank with API 650

when i have to use self supported roof?

when i have to use supported roof?

D=6.34m

H=6.1m

V=173m3

material:WATER G=1

STEEL:A-36

seismic zone :3

velocity of wind=100km/hr

pressure:atmospheric

if i calculate a supported roof

how to calculate that?

thanks

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Guru

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#1

### Re: calculate a tank with API650

06/15/2012 4:57 PM

With a wind velocity of 100MPH, I'd bury it and put a supported roof on it.

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#2

### Re: calculate a tank with API650

06/16/2012 12:04 AM

You said IT

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#3

### Re: Calculate a Tank With API650

06/16/2012 7:31 AM

(not an engineer - bloody self educating theoreticist - just loading the actual real life problems data base cluster)

yahoo -> http://search.yahoo.com/search;_ylt=A0oG7jm7atxP3mUABfql87UF?p=%22API%20650%22&fr=404_web&fr2=sfp -> http://www.nistm.org/houstonSept2009/docs/2009_HoustonConf_Pres/Basic_API650.pdf (->K:\PDF-s\_planetary_-sattelite_sciences\Mars\*.* -- i gonna study it when the net is down F;Y (mu ha haa))

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Location: Central Midwest
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#4

### Re: Calculate a Tank With API650

06/16/2012 3:51 PM

In the USA, self supported roofs are used up to a diameter of about 30 ft.

Consider filling the tank to only 90% of the shell height to prevent roof damage during any seismic event.

Is this your first tank design?

Where will the tank be located ?

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#5

### Re: Calculate a Tank With API650

06/17/2012 10:56 AM

well

is my first time i design a tank

the tank will located in Peru Tana (Peru is a place with much seismic activity especially in the coast)

it's for a system fire protection

excuse me if i write bad so i don't know much English

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Location: Central Midwest
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#7

### Re: Calculate a Tank With API650

06/17/2012 2:11 PM

Your English is fine......you seem polite and are not arrogant and demanding of answers, like so many others who post on this forum

You many not want to design your tank to API-650 (although following the rules of this standard will produce a strong tank)

In the USA, we follow the rules of NFPA-22 for fire water storage. It is very similar to API-650....

Your selection of a tank diameter matching the shell height is wise in a seismic zone.

Perform a detailed seismic calculation on tank anchorage. The eight bolts I suggested above may not be enough. Evaluate the flexibility of all tank connections during a seismic event (i.e. nozzle piping, vents, ladders and walkways)

You may want to investigate that standard

Good luck

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#6

### Re: Calculate a Tank With API650

06/17/2012 11:15 AM
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#8

### Re: Calculate a Tank With API650

06/21/2012 12:39 AM

There is a certain clause in API 650 that refer that maximum thickness for the self supported roof should be 12.7 mm at some max. degree ( sorry if i quoted wrong as it was way long back when i worked on tanks). If your design is not complying with this limit than you have to go for the internally supported or externally stiffening roof.

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#9

### Re: Calculate a Tank With API650

06/21/2012 10:58 PM

Or you can bypass API 650 AND OTHER CODES ALTOGETHER-- GO FOR A HALF UNDERGROUND --- Precast Reinforced Concrete plate lined tank.

It is only water-- you can avoid a roof .