Using EN flanges in B31.3 piping - any experience
Using EN flanges in B31.3 piping - any experience
(OP)
Im developing a spec where EN 1092-1 flanges (EN 10222-2 P245GH [1.0352]) have to be used in a B31.3 piping system.
Im using B31.3 304.7.2(a) to justify the use of EN 1092-1 flanges, as this standard is known for EN 13480 piping.
The flanges have a known and published rating, which covers part of it's p,T-rating. The wall thickness requirement also needs to be done to cover the 2nd part of the p,T-rating.
I check this using eq (3a) from 304.1.2. Since im dealing with a non-ASTM material spec, stress values have to be determined, which is done based on B31.3 302.3.2 (d).
Now here's the problem;
Where to find tensile strength values at temperature for P245GH flanges in EN 10222-2:2000? Table 2 only shows them for room temperature, whereas table 3 provides yield strength properties (Rp0,2) at temperature.
Any knows how to determine or get these?
Im using B31.3 304.7.2(a) to justify the use of EN 1092-1 flanges, as this standard is known for EN 13480 piping.
The flanges have a known and published rating, which covers part of it's p,T-rating. The wall thickness requirement also needs to be done to cover the 2nd part of the p,T-rating.
I check this using eq (3a) from 304.1.2. Since im dealing with a non-ASTM material spec, stress values have to be determined, which is done based on B31.3 302.3.2 (d).
Now here's the problem;
Where to find tensile strength values at temperature for P245GH flanges in EN 10222-2:2000? Table 2 only shows them for room temperature, whereas table 3 provides yield strength properties (Rp0,2) at temperature.
Any knows how to determine or get these?





RE: Using EN flanges in B31.3 piping - any experience
Denlow60
RE: Using EN flanges in B31.3 piping - any experience
RE: Using EN flanges in B31.3 piping - any experience
You should not look at tensile strength values but the pressure will be placed on the flange
RE: Using EN flanges in B31.3 piping - any experience
For B31.3 work its not sufficient to only look at the p,T-rating. Read my OP.
RE: Using EN flanges in B31.3 piping - any experience
RE: Using EN flanges in B31.3 piping - any experience
RE: Using EN flanges in B31.3 piping - any experience
With determining, I mean calculating, not validating by experimental means, or testing.
Im looking for values of tensile strength at temperature.
PS: please note that NEN in NEN-EN-ISO standards apply to EN-ISO standards for the Dutch market.
RE: Using EN flanges in B31.3 piping - any experience
a) I'm unfamiliar with B31.3 - what is the basis for allowable stress of a material not listed in Appendices? Is tensile at T really required?
b) Is it possible to calculate the design stress acc to EN 13480 (or similar) under B31.3?
c) Purchase the material for the flange with option for tensile test at elevated temperature
RE: Using EN flanges in B31.3 piping - any experience
Thank you for your valuable input.
Regards,
Hubert
RE: Using EN flanges in B31.3 piping - any experience
There are no tensile stresses at elevated temperatures available. I think one of the few EN standards that shows these tensile strength at elevated temperature is EN 10028 (plate) for stainless steels.