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conwaysci
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Standards for Aboveground, Atmospheric Bulk Storage Tanks

05/29/2012 1:27 PM

I know ASME does standards for pressurized vessels but I'm not sure if they list standards for atmospheric.

I'm specifically looking for size and number specifications for access points (hand holes and/or man holes) into large bulk, aboveground storage for atmospheric liquids (petroleum).

Tank sizes: > 330,000 gallons

Any pointers in the right direction would be appreciated.

Thanks,

CS
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lyn
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#1

Re: Standards for Aboveground, Atmospheric Bulk Storage Tanks

05/29/2012 3:55 PM

Go here: Search GlobalSpec and type in: "American Petroleum Institute"

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Lolo Jack
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#2

Re: Standards for Aboveground, Atmospheric Bulk Storage Tanks

05/29/2012 11:24 PM

ASME deals only with tanks or vessels with pressures 15 psi or greater. Below 15 psi, you must refer to API 650 or API 620 standards.
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MJCronin
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#3

Re: Standards for Aboveground, Atmospheric Bulk Storage Tanks

05/30/2012 7:57 AM

API-650 and 620 are commonly referenced as the code of record for many tanks, worldwide.

The API standards give construction details for manway and nozzle configurations but do not specify the number necessay. The minimum configuration for any flat-bottomed tank is one manway in the shell and one in the roof.

The tank owner or his design representative selects the number and sizes of all manways and nozzles. Manways should be no smaler than 24" NPS

A good rule of thumb is one shell manway per 60 ft of tank circumference. (round up)

Flat roofs (w/pontoons)should have one manway/access hatch per compartment

Handholes are used in small compartments......

Tell us more about your tanks.....

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conwaysci
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#4
In reply to #3

Re: Standards for Aboveground, Atmospheric Bulk Storage Tanks

05/31/2012 1:05 PM

Thank you all for the pointers. Looking at API 650: 3-12 I found the following diameters listed 20", 24", 30", and 36".

In addition, this API 650 summary listed vents were typically 0.2 m^2, with a minimum of 4 per tank, and spaced every 10 feet.

p. 45 http://www.nistm.org/houstonSept2009/docs/2009_HoustonConf_Pres/Basic_API650.pdf

If I could ask a follow up question, is there an API guideline to sizing input/output pipes associated with an atmospheric tank of N million gallons. Its a theoretical tank, so I do not have a facility process to design to.
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MJCronin
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#5
In reply to #4

Re: Standards for Aboveground, Atmospheric Bulk Storage Tanks

06/01/2012 3:55 PM

In response to your follow-up question, I do not believe that there are any guidelines that size the nozzles based on the tank size.

Theoretically, you have a large tank because you have a large flow rate; in or out.

Suction and discharge nozzles in a crude-oil tank with millions of gallons of storage would be in the range of 30"-48"

There may be multiple inlets and outlets for a tank of this size....

Regards

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