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?
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...
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...
