On your first point, I agree that where the discharge line ties into the large volume of the flare header, this expansion to a large volume should behave similar to an open relief. So we could apply a reaction force at that location, though a large relief header should be able to handle that...
That photo is of an open discharge relief, not a closed system. The jet force is obvious in this situation and needs to be designed for.
My question is regarding steady state forces for closed systems where steady state flow is established quickly when the valve opens. At the PSV, the change...
Yes, this is the ambiguity I'm referring to from the code.
This statement seems to imply that loading is small enough to not be considered, except at sudden expansion (presumably at the point where the piping connects to the large volume of the flare header). But then goes on to say, a complex...
Is there a reaction forced imposed on PSV inlet/discharge piping in a closed system relieving to a flare header? And should piping and structures be designed to handle that loading in steady state?
I know many companies who do not consider reaction forces on closed systems, and several who...
All great input. I appreciate it.
It's apparent I need to involve a materials specialist, and an FE model is expected as well.
One thought I have is to suggest extending refractory beyond the dissimilar weld so the temperatures at the weld are lower, and the temperature gradient curve is less...
A client is requesting a Stress analysis for a proposed design that would involve welding a short spool of 316H piping between two sections of refractory lined Carbon Steel piping.
Fluid operating temperatures are between 1300°F and 1400°F. I do not have details on the refractory lined pipe's...
ASME B31Ea-2010 Paragraph 3.4 requires that PD/4t + 0.75*(M_sustained + M_seismic)/Z be less than an allowable stress value dependent on the applicable Piping Code (B31.1, B31.3, etc.).
I am trying to understand how to set up load cases (using Caesar II) that correctly calculate the "M_seismic"...
