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Thanks for the information. I agree that the weight is a consideration but the large number of 'T' size valves is more of a concern for us. We have used rupture-pin (Callidus) and buckling-pin (BS&B) devices in another installation and these are also very large and weighty. This is fairly...

FARRIS markets some super capacity PRV's with orifice sizes designated at U (31.5 in2), W, W2, X,Y,Z (176.7 in2). Does anyone have experience with these ? Are they acceptable? Do they meet codes? What are the pros and cons? We have a light hydrocarbon application with a set pressure of 50 psig...

tkdhwjd Yes, I was refering to the main header velocity/momentum. The liquid jets toward the end of this header, builds level and forms a wave that rebounds back towards the inlet. Becuause level builds at the end of the distributor the arms at that end do tend to distribute most of the liquid...

Thanks for the response The situation is actually a little more complicated becasue it's a multiple downcomer type tray. I have attached some sketches. Obviously I'd have to post a lot of information to allow anyone to get involved in a detailed resolution of the problem. I do have some...

No, I don't have access to the UOP design specficiation. Can you describe teh features of the 2 phase distributors?

Are there any good references for two-phase (C3/C4 hydrocarbon) feed distributor design for multi-pass tray towers? We have a multi-arm perforated pipe distributor proposed but air/water tests and CFD simulations indicate severe liquid maldistribution with one arm (first one) getting little...