U-STAMPED VESSEL VENTED TO ATMOSPHERE
U-STAMPED VESSEL VENTED TO ATMOSPHERE
(OP)
A steam condensate system has a condensate collection vessel U-stamped design pressure 5 barg open to atmosphere through a 8" line.
According to ASME should I install PSVa set at 5 barg?
Thanks
According to ASME should I install PSVa set at 5 barg?
Thanks





RE: U-STAMPED VESSEL VENTED TO ATMOSPHERE
The vent would probably need to be treated as a relief line with supporting calcs for overpressure protection capacity. Also, line should probably not have any restrictions/valves.
RE: U-STAMPED VESSEL VENTED TO ATMOSPHERE
Typically, this kind of a condensate collection tank has a generously sized vent (with no shutoff valves)open to atmosphere.
The fact that your tank has been designed to 5 barg (~73 psig) means to me that it was probably originally used in another service. Even deaerators that are slightlt pressurized are only designed to a MAWP of 30 or 50 psig.
Usually this type of tank has corrosion problems and is replaced every 4-7 years. Stainless steel and heavy wall cast iron models are available.
http://www
-MJC
RE: U-STAMPED VESSEL VENTED TO ATMOSPHERE
Initially the added shell thickness from design definitely helped with the corrosion/erosion aspect. When repairs are necessary the top section is changed to SS. In the later years several of the vessels were easily converted to flash tanks to generate low pressure steam and the appropriate CIDs’ generated and PSVs'aded to cover the change in service.
All these vessels are on the Vessel Inspection Schedule.