2in. Blind flange API 6bx of rating 10k

[mforoutanfar]

Hi everyone.

I'm a bit confused about an item our customer has required from us in a project. The item is a blind 2 inch API flange of 10K rating (I assume it should be a 6BX flange, right?).

The problem is that the nominal size of blind 6BX flanges in API 6A standard starts from 5 inch(ish...), while numerous manufacturers have claimed on their websites that they can supply flanges under 5" with our required spec.

I was hoping someone could shed some light on this matter.

 

[calimechengr]

Look on page 276 and 277 of API 6A 20th Ed. You will find the specs for nominal blind flanges of nominal size 1-13/16 thru 5-1/8. Keep in mind, API nominal sizes differ in nomenclature. The nominal sizes available are 1-13/16, 2-1/16 2-9/16, 3-1/16, etc... A scan through 6A and you get the gist.

Check with the customer. If a 2" API blind flange w/ 10 ksi rating was requested, they probably meant 2-1/16 10 ksi.

I hope this helps

 

[mforoutanfar]

Thanks for the info. I do believe our customer also meant 2-1/16.

My problem is that the table for blind flanges in API 6A (Table 46 in 19th edition) starts from size 5-1/8 for the pressure rating I require. For unlisted sizes, the table refers me to another table (44, which is for blind and test flanges). But this table doesn't include any dimensions for the added hub thickness.

 

[jbeckhou]

Mforoutanfar

See table B.44 Type 6BX Blind and test flanges, API-6A 19th.

Please note API-6A is know in the 20th ed.



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