Flange Hydrotest pressure (EN1092-1)
Flange Hydrotest pressure (EN1092-1)
(OP)
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.
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.





RE: Flange Hydrotest pressure (EN1092-1)
In ASME B16.5 regular flanges doesn't need hydrotesting, but flanged fittings do and I think it works the same way in the EN world.
RE: Flange Hydrotest pressure (EN1092-1)
Would you be able to help me further with this?
Thanks.
RE: Flange Hydrotest pressure (EN1092-1)
"The test pressure (see A.1.6) shall be a minimum of 1,5 times the allowable pressure at room temperature."
RE: Flange Hydrotest pressure (EN1092-1)
"-at assembly and testing 200 MPa (Ptest = 1,43 × PN)."
So it seems you should use a higher PN-rate when your pressure testing becomes higher that 1,34xPN.
Kelly
RE: Flange Hydrotest pressure (EN1092-1)
The 1,43PN is taken directly from the PED and that pressure will create a stress in the material that can be up to 95% of the yield strength of the material, which also happens to be what most EN standards specify as their max allowed stress at test condition. So I would say that you only need to worry about the test pressure when it gets higher than 1,43PN.
RE: Flange Hydrotest pressure (EN1092-1)
Referring to the statement:-
The test pressure (see A.1.6) shall be a minimum of 1,5 times the allowable pressure at room temperature."
I was wondering if there is any limit specified in standards on the maximum allowable hydrotest pressure.
Please comment.
RE: Flange Hydrotest pressure (EN1092-1)
RE: Flange Hydrotest pressure (EN1092-1)