vessel re-rate
vessel re-rate
(OP)
I want to re-rate a vessel which is designed for 1.5 MPag @ 190degC. This vessel has another design criteria which is 50kPag @200degC which has been ignored during the design. to re-rate it, Should I only check the design for 50kPag@ 200degC or I need to rerate the vessel for 1.5MPag @ 190degC.
basically should I consider the highest pressure @highest temperature for vessel re-rating or only checking the vessel design for missing operating condition will suffice?
Thanks.
basically should I consider the highest pressure @highest temperature for vessel re-rating or only checking the vessel design for missing operating condition will suffice?
Thanks.





RE: vessel re-rate
RE: vessel re-rate
If it passes 1.5 @ 200C, then 50kpa @ 200C should be OK.
You really need to understand where this data comes from and how much spare has been added from max operating to design temps.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: vessel re-rate
RE: vessel re-rate
I have had to re-rate piping with a sliding scale of pressure based on monitoring UT thicknesses, but that wasn't at original design.
Perhaps it came from the PSV sizing? What service is this vessel in?