Dear Dave, Greg and Flexy,

None of them have gave a clear solution on my clarification.

But the doubt is, as per COADE Pipe stress analysis Seminar notes, Chapter-2 page 2-19, section 2.2.3-Consideration of Nozzle loads – It is specified that for a nozzle load in +Y direction (237 lb) seems to be unnatural for a gravity load and therefore it is not an optimally supported system. What is meant by "unnatural for a gravity load"

Is nozzle load must always be in the –Y direction ?