PSV & ATEX
PSV & ATEX
(OP)
Hi
i red in 94/9/CE guideline that safety protection system needs only Ex specific marking, it's true?
what is the correct marking (PSV in Zone 2, explosion atmosphere by gasoline vapours)?
1) Ex
2) Ex - II
3) Ex - II 2G
4) Ex - II 2G - IIB
5) Ex - II 2G - IIB TX
6) Ex - II 2G - IIB T3
thanks
i red in 94/9/CE guideline that safety protection system needs only Ex specific marking, it's true?
what is the correct marking (PSV in Zone 2, explosion atmosphere by gasoline vapours)?
1) Ex
2) Ex - II
3) Ex - II 2G
4) Ex - II 2G - IIB
5) Ex - II 2G - IIB TX
6) Ex - II 2G - IIB T3
thanks





RE: PSV & ATEX
Second: I never heard of a (spring loaded) PSV which has a special marking acc. to 94/9/CE. What shall be the ignition source?
I know that LESER went through the 94/9/CE for their safety valves and the result is that the valves can be used for all group II installations. But the valves are not especially stamped. That would only be necessary if there are any restictions.
RE: PSV & ATEX
1G, 2G, 3G
possible ignition source:
- surface temperature
- electrostatic charges
I think micalbrch's right but I want to have documented confirmation, if there is one
RE: PSV & ATEX
Best regrads
Morten
RE: PSV & ATEX
The surface temperature is not caused by the valve but only by the fluid. So, that is not an ignition source caused by the valve. Electrostatic? If there is no plactic in the valve, then there will no electrostatic.