maximum inlet nozzle size from tank roof

[mechfabricator]

what is the maximum inlet size for atmospheric tank as per api 650.
can we put a 20" inlet nozzle in roof of tank?

 

[fegenbush]

API 650 does not prescribe a maximum inlet size, but the maximum size listed in Table 5.6b is 60" NPS.

 

[Duwe6]

And please bear in mind that a generic roof design from 650 is essentially a 'rain hat'. It has no provisions for major loads, so it is incumbent on the tank designer to 'beef things up' to take that large, localized load.

 

[IFRs]

Spash fill is not recommended for volatile products
And what Duwe6 said.