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Thanks to all for your assistance! Regards.

CBX254-125 Note that there is a 1/2" nozzle in the tank that is plugged. This cannot be used for a PSV. Removal of the plug invalidates the manufacturer warranty and can cause bladder damage.

Can anyone here provide additional insight on this thread? I got some feedback from another forum, but not sufficient to answer my question. TIA thread794-482742

Is there aa acceptable method to get ppl from other forums to review this thread? TO get some additional thoughts?

Piping is ASME B31.3 (2004ish) and vessels ASME Section VIII D1 (2010ish).

TBP - But if the expansion tank is an ASME Section VIII, D1 vessel - then pressure protection must be provided for the vessel or an analysis performed in accordance with UG-140, overpressure protection of a pressure vessel by system design, must be performed. In this case, overpressure by fire...

So, in my world (Department of Energy - Nuclear Waste Management), if its an ASME vessel and fire case is plausible - then yes a PSV for fire case is required. Basically, we say that a fire is just as possible to happen during a maintenance event (i.e. vessel LOTO) as during a normal operations...

Thanks - did not know about the double posting policy. I will rectify that situation shortly. When we evaluate fire case, we assume that the vessel is blocked in, thus there would be no pathway for liquid to exit the vessel. Mounting the PSV on liquid side would temporarily help the...

I have a chilled water system with an ASME Section VIII, D1 expansion tank. The expansion tank has an internal bladder, which is the connection to chilled water system (i.e. water inside of bladder). The tank itself is charged with air. Being that this is an ASME vessel, I need to provide...

The design pressure is 0 psig. But never-the-less, section 3.10.8 addresses emergency venting requirements regardless of the nameplate design pressure. It requires you to calculate, in accordance with F.4.1, the permitted pressure accumulation in the tank that serves as driving force for...

So I am evaluating an existing API 650 tank for emergency venting (fire case). The tank is anchored, so per 3.10.8.3.b the limit on internal pressure for emergency venting is determined via F.4.1. The tank has been constructed with an ASME F&D head, with no compression ring. The equation for...

Let me add another condition....I am working to an earlier edition of B31.3. Sorry that tidbit was not originally included.

I know that B31.3 excludes instruments. But I have a question regarding thermowells - unlisted component or not? What say you? Thanks, Tony

Thanks for the help. I have another related question. If I enter nozzle loads into the WRC 107 portion of COMPRESS, will these nozzle loads be treated as external forces and be considered in calculation of the base shear and overturning moment in seismic?

I am applying an external vertical force to the vessel. Is this external force included in determining the weight of the vessel to be used in calculation of the seismic force Fp?