OK thank you both.

I mis understood what was being quoted in explanation of "No RFT/WLT in reduced fitting SIF" checkbox and assumed that it meant that it would include these fittings in WRC329 unless the checkbox was checked.

I have now seen the error of my ways as reading page 6-100 RFT & WLT are excluded from your WRC329 calcs.

Very sorry for the confusion I must check thru' the manuals more.

I had noticed that WRC329 did not include for reinforced branches but only because there was not enough data to make any definitive recommendations & I had assumed (wrongly) that you were including them.

There again my gut feeling is that as long as repads are not to wide then same kind of stresses will apply to headers & branches as for weldolets and unreinforced branches.