Dear all,

I've ever heard from someone that PSV thrust load to be considered in vertical (big effect) if it has big back pressure.

We have the value now from vendor 11 ton. I can't pass flange leakage. The ration is too big. Increasing the rating will help from #300 to #1500. But still in question in my mind if it is to be applied in vertical as per client request. Do you have any idea...what is the basis?

I think the big thrust load occurs at outlet (horizontal) due to pressure drop and change size of the area (reducer). The direction is opposite to the flow at the location. Like thrust on the plane.

Also I think in vertical will be F = k* Xmax (where X max = max displacement of the spring). Yes we have also the formulation in vertical (but not by vendor).

Currently we sill ask vendor about the direction too.

I need respond also from dear Mariog..

This time just a drawing and a physics problem: calculate the jet net vertical force in the "device" (I'm not saying it is a PSV...).

About your troubles: if Vendor considers 11 tones transmitted to the PSV inlet flange, they think everything shall be ok with their flange, bolts assembly, etc?

best regards