Flange Hydrotest pressure (EN1092-1)

[pingmi]

Hello,

I referred to EN 1092-1-2007 standard for hydrostatic test pressures & test duration of PN designated flanges. However I could not find any such reference in that standard.

If I recall correctly, old versions of applicable DIN standards for steel flanges used to mention minimum test presure equal to 1.5 x maximum working pressure of flange at 20°C as per P/T rating.

Can anyone help me with this?

Thanks in advance
(This thread is also copied in CEN / ECN Code issues forum)

 

[Jmoore1]

B31.3 provides hydrotesting pressures and calculations. Min test pressure is 1.5 *design pressure * Km (Km is a temperature correction factor for the weakest part of the system, which will be your flange in most cases)

So if DT is 800 F DP is 800 PSI, go to your flange material in b31.3 stress tables at 800F, Km=(S at room temp)/(S at 800F)

Plug into your formula, check that the hoop stress does not exceed your materials yield stress (HoopStress=PD/2T)

Done.

 

[pingmi]

Thanks Jmoore1 for your reply. I need to have a basis / reference from EN standard to justify the hydro test pressures & test duration of a PN rated flanged fitting or valve. Very often such references are required to convince the local inspection authorities.

Would you please help me with this?

Thanks.

 

[europipe]

For the authorities, I think you mean testing acc.
Directive 97/23/EG PED.
This is 1.43x PN of the piping system, not only the flanges.