Thanks LittleInch.
The pipe is indeed just out of the PRV, with a short length to atmosphere.
@shvet, this PRV is installed on a saturated steam line, with the lift pressure set to 22 barg, and is piped straight-up approx. 8 meters.
I'm confident that there is no back pressure issue, and very...
When installing a pressure relief valve, does the outlet pipe need to use the same flange pressure rating as the valve?
i.e. a PRV with DN50 PN40 flanges, can a DN50 PN10 flange be used for the blow off piping, seen as it is exposed directly to atmosphere and does not actually see any...