Mitigating Processes
Mitigating Processes
(OP)
I am evaluating a tube rupture RV case. Due to the tube size (3") and high pressure diffential, the calculated flow is huge. The calculated RV size is 24", which is larger than any nozzle. I am hoping that one of the forum members might have encounted this problem. Does ASME allow for mitigation via upgraded preventive/predictive maintenance?
Thanks in advance.
Thanks in advance.





RE: Mitigating Processes
I have one question. Did you use the hydrotest pressure of the shell as your low pressure? This may help reduce your required rate.
In addition, API 521 also allows credit for the normal volumetric capacity of the system. This is based on the assumption that as soon as the tube ruptures, the normal flow will stop, and all that will be going downstream is from the high pressure side.
RE: Mitigating Processes
Tube rupture is a rare phenomena and you're talking about a huge (probably bigger even than is commercially available) PSV. Why not go with a rupture disk which anyway will offer better protection from a rapidly acting pressure surge such as the tube rupture scenario. If you do use one or more RD's, put one in the center of the tube bundle; for several, space them around the center of the tube bundle.
RE: Mitigating Processes
RE: Mitigating Processes
RE: Mitigating Processes
RE: Mitigating Processes