Thank you 'akpipelineengr'
You're right, I had it backwards.
I guess my basic question is looking at the results in the two example Cases that were described above, specifically Case 1
Case 1: Lower stress ratio, a higher Tr. Putting that higher value in equation 3.5 and then taking the 'Max'...
API 579 section 3.4.3 b) has me confused. Especially step 4 and equation 3.5 and how that relates to Figure 3.7 for the ‘Temperature Reductions’.
I’ve been determining the MAT on sections of a relief valve’s discharges in cases of auto-refrigeration and temperatures below -20 deg F, either the...
Can an tank, built to API 650, that was not x-rayed at the time it was fabricated, be x-rayed in order to improve the MAWP and/or the MAWV at some time in the future?
The relief valve calculations have considered the case for an exterior fire around the vessel that it is protecting and the resulting discharge rate. We are now at the stage of evaluating the discharge piping under the resulting forces and the piping restraint requirements. The question was...
Performing pipe stress analysis on relief valve discharge lines during an exterior fire scenario (vaporization), a lot of times results in higher discharge rates than other relieving scenarios (Failure of Automatic controls, Check valve failure, fully opened control valve by-pass, etc) a lot of...
You could contact the National Board for out of date re-prints.
http://www.nationalboard.org/Index.aspx?pageID=134&ID=290
Out-of-Print ASME Editions
The National Board has a library service designed to assist organizations that use out-of-print editions and addenda of the ASME BPV Code. By...
Section UG33 (a) (1) provides to use Section UG32 (d), along with UG33 (d) for external pressure on ellipsoidal heads.
Section UG32 (d) formula (1) is applicable for 2:1 elliptical heads (manufacture's standard). What if the head is fabricated for a large vessel, where say the inside diameter...
We are in the process of performing fatigue studies on branch connection (like a weld-o-let) that contain relief valves under a "Chatter" scenario in order to predict future failure. The question is: How do you measure, and record, the resulting forces at the branch during a chattering event so...
In a re-rate scenario, the original fabrication documents did not indicate that the welds were x-rayed. As a result an efficiency of 0.70 was used to determine the current retirement thickness. Is is allowed to now perform a spot or full x-ray and then to use either a joint efficiency of 0.85 or...
