Design Pressure 1440 psi - Flanges S300
Design Pressure 1440 psi - Flanges S300
(OP)
ASME certified PV was built in 1959, max design pressure was 1440 psi, but most of flanges are S300 (ANSI B.16.5).
Maybe by that year flanges S300 could be used for different pressures than today (740 psi).
Any contribution to put light on this topic will be appreciated.
Note: see attached id. plate.
Maybe by that year flanges S300 could be used for different pressures than today (740 psi).
Any contribution to put light on this topic will be appreciated.
Note: see attached id. plate.





RE: Design Pressure 1440 psi - Flanges S300
RE: Design Pressure 1440 psi - Flanges S300
RE: Design Pressure 1440 psi - Flanges S300
RE: Design Pressure 1440 psi - Flanges S300
Why do you think they are class 300? - A stamp or have you checked dimensions?
Maybe the tank was designed for 1440a as a standard design, but only used for 740.
MAWP takes precedence?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Design Pressure 1440 psi - Flanges S300
The MAWP & MAWT are plainly stamped on the plate. Period.
Your speculations about the flanges are meaningless. If you really feel the need to reverse-engineer this Code vessel, you will need the U-1, the design calc's, and the design drawing(s). Without those, you are just guessing. BTDT.
RE: Design Pressure 1440 psi - Flanges S300
Dimensions of flanges were duly checked as per ANSI B16.5, they are #300.
RE: Design Pressure 1440 psi - Flanges S300
You would need to find the original drawings to make sure but after 60 years, it is a miracle the vessel is still there never mind not corroded or fatigued out.
Why the query?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Design Pressure 1440 psi - Flanges S300
Vessel is in operation for longer @ low pressure, the owner wants operate it in higher pressure taking advantage of the statements in the ID about the design pressure. te About flanges, all of them are WN, we also think that original flanges were changed by those ones.
Finally, vessel is in good condition without evidence of any visible damage mechanism affecting it and no report of cracking or whatever similar.
RE: Design Pressure 1440 psi - Flanges S300
Regards
R6155
RE: Design Pressure 1440 psi - Flanges S300
Still some odd issues.
You say that "most" of the flanges are S300. What are the rest.
You call them S300.Why? As far as I can tell the S stands for slip on.
What are the nozzles on this thing? Welded pipe with flanges on the end of the pipe?
Or flanges welded directly onto the vessel?
A picture or two would help!
In any event to use this at a higher pressure than you do now will need different flanges and a check on the entire system to find the lowest rated component. That's what gets you the MAWP of your system.
It would seem that the flanges don't match the vessel for some reason now lost in the mist of time, but an uprate of a 60yr old vessel needs more than a cursory visual inspection. Some UT wall thickness checks, a crack check on high stress locations and probably a pressure test are in order.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Design Pressure 1440 psi - Flanges S300
As to steps required to find out what MAWP might be safe for this vessel, with or without a flange replacement, you've been given good advice by others already.
RE: Design Pressure 1440 psi - Flanges S300
The MAWP & MAWT are plainly stamped on the plate. Period.
Your speculations about the flanges are meaningless. If you really feel the need to reverse-engineer this Code vessel, you will need the U-1, the design calc's, and the design drawing(s). Without those, you are just guessing. BTDT."
Right... Because vessel manufacturers always comply with each and every one of the rules of the Code of Construction 100% of the time, just like Authorized Inspectors always check every single calculation without ever missing anything. Oh, and field contractors never make modifications to existing vessels without first obtaining all of the necessary approvals.
-Christine
RE: Design Pressure 1440 psi - Flanges S300
What's the rest of the system rated to? Or in this case, maybe a safer question, what are the flange ratings?