Nozzle Failing Under UG 45

I am designing a hygienic vessel. For which requirement of pipe is as per DIN 11850.

Design pressure of vessel is 1.65 bar. Total Height is 10 m. Vessel wall thickness is 6 mm.

As per DIN11850, maximum pipe thickness available is 2 mm. Available pipe sizes are DN10 to DN150.

While designing nozzles, these pipes are failing under clause of UG 45 due to 2 mm thickness.

I checked with adding pad plate but still it is not passing.

The min. required thickness of nozzle is more than 2 mm.

Solution for this problem will be highly appreciated.

Can we exempt UG 45 ?