Hello:
I am curious if there are known burst pressure ratings for ASME B16.5 Flanges, and what safety factor is put on the design stress of these components would be.
J
Hey Everyone:
Had a general question regarding Creep concerns. If I have a SA-516 Gr. 70 vessel with a allowable temperature of 650 deg. F that runs for 45 hours at 800 deg. F:
1) IF the vessel will no longer see temperatures above 650 deg F, is there any concern for creep failure?
2) Does...
Does the ASME Code (Division 1 or 2) limit the amount of weld overlay that could be used on a component to increase the overall thickness to handle a higher pressure? Example, if I had a 12" Diameter Carbon steel shell that is 1" thick, is there a limit to how much weld overlay could be put on...
Good evening everyone:
I have a extremely large liquid oxygen sphere that was originally designed for liquid nitrogen at -320 deg. F, built back in the mid 60's. I have a need to sub-cool my liquid nitrogen to around -340 deg F. If I were to perform a Code alteration per NBIC, I assume I...
Hey Everyone:
I know that the 2013 Code recently adopted Cold-Stretching for ASS vessels, but I wanted to confirm the Code allowable limit to the MDMT. I thought the Code says -320 deg. F is the lowest it can be used at, but I was hoping someone could determine where that comes from? Do any...
Hey Everyone:
I am working on a repair specification for a vessel from the 50's made of SA-285 Grade C (Firebox). I have to put some overlay patches on some corroded areas, and was hoping to get some opinions on what material to use. Will new SA-285 Grade C be ok? Can I still ignore the PWHT...
Hey Everybody:
Has anyone ever attached a nozzle to a cylindrical shell while only performing an external fillet weld? I want to do this for an alteration, and while I think I can, just wanted to see if anyone has done this before. Can you do it without any weld inspection if you are under...
Hey Everyone:
I have a 4" Natural gas line feeding a facility. I need to add a 4" earthquake proof valve to the line by cutting out a section of straight pipe and welding the valve in with slip on flanges. My question is does ASME B31.1 allow me to waive performing a pressure test on the...
Hey Everybody:
Does ASME Code require that the outlet of a conventional spring operated relief valve be larger than the inlet? I have seen a few NB marked valves that are 3/4" x 3/4", but the ones I am looking at our 3/4" x 1". My client currently has a coupling reducer on the outlet, turning...
Does anyone have a old copy of Code Case 1670-1, or can at least tell me what the Code Case was about? One of my cryogenic vessels references it in the U-1A form but I could not find much data on it.
So a question has come up recently that I started working on, but was curious if anyone had done a generic calculation that estimates the time it would take to vent a pressure vessel filled with a ideal gas.
Basically, I am assuming the simple case where a valve is installed on a nozzle, and...
Hi Everyone:
Someone once told me that ASME B&PV Code had an exception stating that UV stamped relief valves were NOT required if you are protecting against thermal releif or liquid expansion between two closed valves. Is this true?? Does B31.3 say anythign like this?
Thanks
Hi Everyone:
Hopefully this is a simple question...
Where does the 2010 ASME Section VIII Div. 2 Code deal with discontinuity analysis for the head/shell area of a vessel? I have a horizontal cylindrical vessel with spherical heads. The 95 Code was much clearer (in my view) on how to handle...
Hi Everybody:
Had a question regarding material callouts in ASME B16.5 Code. I have a 2500# flange that is made of SA-336 class 5A material, but the material is not listed in 16.5 in any of the matieral groups (at least I did not see it). I guess my two question are:
1) Are you allowed to...
Hi Everyone:
I have a copy of the 1956 ASME Section VIII Code. back then the maximum joint efficiency they allowed if you did X-Ray and stress relief was 95%. When did the Code Change and start allowing 100% efficiency?
Jason
Had a general question for the group regarding studs and nut selection based on flange selection. An issue I was having with 16.5 is it lists bolting specs based on strength or special alloys. Is thre a website out there or a reference where if you have the temperature range, pressure, and...
Hi:
Got a two part question for everyone. In a non-lethal, 10,000 psi pressure vessel, would a 1/2" grayloc hub being used as a nozzle on a hemispherical hub be required to have radiography performed on the weld? I did not think so due to the size and not using table UW-12 values in the...
Hi Everyone:
I have seen this referenced many place an talked about, but I am still a little confused on the terminology of some older steel plate.
What is the difference between Flange quality steel and firebox steel? I am looking at the old SA-212 specification, and it listed a Grade A and...
Going to be putting together a repair package for a 10,000 psig hydrogen service vessel. I need to replace a nozzle. was hoping for any recommendations/guidance in terms of material, tests, or anything else I should be aware of or discuss because it is in high pressyure hydrogen service (temp...
Hey everyone:
Just needed some clarificaiton. On the Secotion II, Part A material callouts. In the table with Checmical requirements for the various specficiations, what does it mean when there is a "..." under that checmical column??
Also, are single values listed the MAXIMIM amount of that...
