PED 2014 water temperature

[Ehiman1]

Hello,
I can’t find in PED 2014/68 UE legislation where water is considered as gas only at temperature higher than 109 C and not from 100 C. Does someone can help me please?

 

[Compositepro]

Pressure vessels are regulated only when the operating pressure exceeds 15 psi ( at least in US). 109C is where the vapor pressure of water is about that.

 

[Ehiman1]

Ok but at 100 C we have tension vapour already at 1 barg, so to me this means that water should be considered out of liquid phase. For PED it is valid only from 109 C but I can t find in the legislation the paragraph

 

[XL83NL]

Article 4, para 1(b), is where that limit is first described, among other sections. Please note it says higher than 110 deg C, say anything at design of 110 deg C is outside that scope.

Huub
- You never get what you expect, you only get what you inspect.

 

[Ehiman1]

Thank you, because to me water has vapour pressure higher than 0.5 barg from 100 C and not 109/100 C. There is no evidence on the legislation

 

[XL83NL]

It’s about the vapour pressure at design temperature: when that vapour pressure is more than 0.5 bar above atmospheric pressure, it’s considered a gas.

Huub
- You never get what you expect, you only get what you inspect.

 

[XL83NL]

Solved it?

Huub
- You never get what you expect, you only get what you inspect.

 

[Ehiman1]

Yes thank you very much