## EN 1591-3 Flanges

## EN 1591-3 Flanges

(OP)

Hi, I have for the last few weeks dedicated a serious amount of time producing an Excel calculation table for EN 1591-3. I have managed to get so far but for some reason can not calculate FGΔ. Can anyone tell me what the max all I≠0 means in the calculation as im sure I am missing a trick here. Thanks

## RE: EN 1591-3 Flanges

## RE: EN 1591-3 Flanges

I too spent quite a long time few years back in producing excel calcs according to EN13445-3 annex G. Nowadays there are commercial softwares such as VVD that does these calculations.

But calculating FGΔ according to EN1591-1 (equation 51) means that you have to calculate FGΔ in every subsequent condition and then the max value calculated is FGΔ.

For example: Subsequent conditions 1, 2, ...n

FGΔ1=(FG1min x YG1+(FQ1 x YQ1 +(FR1 x YR1 - FR0 x YR0)+ ΔU1)) / YG0

FGΔ2=(FG2min x YG2+(FQ2 x YQ2 +(FR2 x YR2 - FR0 x YR0)+ ΔU2)) / YG0

FGΔn=(FGnmin x YGn+(FQn x YQn +(FRn x YRn - FR0 x YR0)+ ΔUn)) / YG0

and finally

FGΔ = max(FGΔ1 ; FGΔ2 ; ... ; FGΔn)

Hope this helps...

Regards

Harri

## RE: EN 1591-3 Flanges

## RE: EN 1591-3 Flanges

When checking the admissible loads in Section 6 if for example the conditions in the table state that ψZ=ψmax is ψmax calculated at Js=+1, ks=+1 and km+1. Also if the conditions state that ψZ=ψopt is ψopt calculated at Js=0, ks=0 and km=0. Thanks a lot for any help.

## RE: EN 1591-3 Flanges

Calculation sequence is presented after table 2 in the standard EN1591-1. When calculating for example ψmax, calculate ψmax with the equation 82 using js=+1, km=+1 and ks=+1. ψmin is calculated with js=-1, km=-1 and ks=+1 and so on.

Then you have to determine the value of jm (equation 80) and ψopt (83).

Finally for example if jm=+1 and ψopt >= ψmax, then km=+1 and ψz = ψmax.

I attached some example from calculation of integral flanges. I think that this was very useful when I did my calculations. It has all the required initial data to begin the calculations like dimensions, materials, etc. And there are results so that it was easy to compare my own calculations and this example. It should be reliable, one of our NB inspectors gave it to me.

Regards

Harri

## RE: EN 1591-3 Flanges

Regards,

James