Bonjour à tous,

for a piping calculation with negative temperature (T1=-100°C ; T2=-50°C), I remarked that fh1
 It seems that the Young modulus ratio is inverted for negative temperature.

fa=U(1.25fc+0.25fh) (Eh/Ec)

h-> hot=Operation
c-> cold = ambient temperature...

On my understanding.

Is that normal?

Best regards.

MH

Please read "I remarked that fh1

Best regards.

MH

Please read

"I remarked that fh1 < fh2"

Best regards.

MH

Hello,

The answer is in the question.

I miss understoond
h-> hot= metal the hotter
c-> cold = metal the colder

for cryogenic application fa(-100°C) < fa(-50°C)

It is normal

Best regards.

MH

MH

When you say fa(-100°C) < fa(-50°C) you would remember that fa is the allowable stress range, as EN 13480 says.