Pressure Vessel for Vietnamese Plant

If you have quoted it accurately, then that is correct for their jurisdiction. Although I haven't seen that particular requirement before, it does make sense to test the vessel in the same orientation and with the same support it will have when erected.

Thanks Tornado, i agree with you if that particular pressure vessels are short one in height. But if its height is, let say, 70 metres, and its field/erection position is vertical so it means that we have to do shop test vertically!?!. Does this still make sense in terms of testing at fabrication shop? Kindly help me. I really have no experience.

This is not an abnormal requirement. One reason for this stipulation is that the pressure in the bottom of the vessel will also have to withstand the static head of the liquid during pressure test. Another is that the stresses imposed by the stucture itself ar correct in this position and the pressure test is more meaningfull. The OP may be able to get a waiver (technical deviation) if it is not practical.

That is about the same thing I said, though in different words. We now have 3 "guests" in this thread. Maybe they are all different persons, or maybe not. It is much better to register under an identifiable name, whether real or nickname. Then at least we can get an idea of who is who.

For Large vessels this is how it is done as a normal proactice.

Shop testing is done in horizontal position with 1.5 times the design pressure to verify the design / fabrication integrity. Once this is cleared and passes sucessfully the Vessel can be tested again on-site to verify the structural integrity as well as the foundation settlement. Therefore the only way to go around for you is to raise an techincal query or a concession request for deviation on the local regulatory code requirement. Common Industry proctice allow so should should be able to get around.

[Quoted] "Vietnamese's Law/Code(TCVN) states that the shop hydrostatic test shall be conducted in the same position as field/erection position" [Unquoted]

Is above statement correct?

Answer: "No".

How the heck do you "unquote" something...?

Your 1st brackets should be "[Quote:]"...the closing brackets should read: "[End Quote]"

Yer all velly welcum.