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[MW:12909] Second PWHT acc.to EN 100216-2

By Materials & Welding
Dear experts
i have a question about pwht.
Our subcontractor made overall pwht on butt joints pipe to pipe
connection before welding all branch connections.so they need to
complete outstanding branch connections and do again pwht. because of
first welded branch connections there is about 53 cm overlaping area
which will undergo for second pwht.

i made an calculation acc. to en 100216 -2 # 8.2.4 and annex 2 that
2nd. pwht can be done below 30 °C below the first pwht temperature in
order to do not exceed Pcr value given in the annex 2 , by calculating
P1 value for 1st pwht and P2 value for 2nd. pwht on overlaping zone
and calculating the mean (p1+p2):2 for that zone.

I would like to know if is it possible to do such calculation acc.
stndart for overlapping zone and apply it.

thanks


Sedef Pala

Iws-2009

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