Dear Sir,

I am designing column ( 3800mm ID X 22200 mm Tan/Tan and skirt OD is 3846 mm). my question is, when we do calculation in PV Elite it is not considering complete height of skirt i.e transition length from top of skirt to tangent length is not considering and my client is asking me justification so please advise me on this. please see below sketch for your reference.

(skirt heigh 1995+1995+1495+1495+1043 =8023 mm but it is suppose to be 8200 mm)

dear sameercnn
in chinese code ,it is 400mm~600 generally.

you can increase the skirt length by the same length of transition to take it into account !!!

Also it will ensure a marginal increase in the stresses at the skirt's bottom

Dear Sameer
Software doesn’t know what your transition length is. It just calculate, as per given input. However, as far as stress calculation is concern, junction (i.e. Skirt to Head) is formed at 8023 mm, not at 8200 mm. therefore, Calculation is adequate. Normally skit length from B.T.L only provided for easiness of dimensioning, as Bottom T.L is reference point for vessel construction.