API 650 Detail A - Figure F.2 1

[Kathia Buena]

Hello,

If I´m using Detail a - Figure F.2, D=16m (52.49ft), H=12m (39.4ft), P= -0.25psi/+0.5psi, is it possible to meet 5.10.2.6 a 3)?

3) The roof is attached to the top angle with a single continuous fillet weld on the top side (only) that does not
exceed 5 mm (3/16 in.). No underside welding of roof to top angle (including seal welding) is permitted.

Per 4) The roof-to-top angle compression ring is limited to details a through e in Figure F-2, seems possible, but i have the doubt due previous paragraph 3), where it seems to indicate that only details b to e could be used, and not a.

Thanks in advance.

KB

 

[Geoff13]

While I'm certain that detail (a) is permitted I wouldn't want to build it.

The roof radius and circumference have to perfectly match the top of shell radius and circumference. Easily done on the drawing, but nearly impossible in the field. Details (b) thru (e) allow a landing area for the roof, making it much easier for the field to build correctly.

 

[Kathia Buena]

Geoff13, thank you very much for the recommendation, I think detail (b) would be much better.

KB