Hydrotest
Hydrotest
(OP)
Dear All,
I'm following the supply for Equipment which is designed in accordance with ASME VIII Div.1 but the design pressure is equal to atmospheric pressure.
As scheduled on relevant QCP the Vessel shall be subjected to Hydrotest full water filling it in Vertical position.
Some days before the mentioned test the Vendor has asked me to perform a 100% LP on main welds only for the following reasons:
- The Hydrotest in Vertical position cannot be carried out considering that the Vessel weight full water filled is too high.
- The Hydrotest in Horizontal position cannot be carried out considering that on the center top head of Vessel there is an inspection opening (see attached file - two halves - DN1000) no leak proof.
Any suggestions on the matter would be greatly appreciated.
Thanks in advance.
I'm following the supply for Equipment which is designed in accordance with ASME VIII Div.1 but the design pressure is equal to atmospheric pressure.
As scheduled on relevant QCP the Vessel shall be subjected to Hydrotest full water filling it in Vertical position.
Some days before the mentioned test the Vendor has asked me to perform a 100% LP on main welds only for the following reasons:
- The Hydrotest in Vertical position cannot be carried out considering that the Vessel weight full water filled is too high.
- The Hydrotest in Horizontal position cannot be carried out considering that on the center top head of Vessel there is an inspection opening (see attached file - two halves - DN1000) no leak proof.
Any suggestions on the matter would be greatly appreciated.
Thanks in advance.





RE: Hydrotest
Steven C
Senior Member
ThirdPartyInspections.com
RE: Hydrotest
RE: Hydrotest
Steven C
Senior Member
ThirdPartyInspections.com
RE: Hydrotest
RE: Hydrotest
Anyway the Vessel is designed with Xray Spot (joint efficiency=0.85) so that the X-Ray are performed spot on main welds (longitudinal and circunferential) includung cross-welds.
The top dished head in fully radiographed and LP tsted.
EyeC
Maybe I think that the X-rays were performed on finished welds.
I'll make you confirmation asap.
Thank you again.
RE: Hydrotest
Steven C
Senior Member
ThirdPartyInspections.com
RE: Hydrotest
RE: Hydrotest
those covers on top head will not hold much/in any pressure.
The only way to test this, if structure and vessel will withstand the weight, is to fill it up after it is erected.
Another way is to weld on test covers at those openings on heads and do a pnuematic test with pressure at vertical height of vessel times 0.433 and hope all your welds are good.
Your client may accept full mt/pt or ut in lieu of testing.
RE: Hydrotest
if no, then i would not be concerned with the welds or lp of them.
is this a hopper for a feeder for light weight materials - looks familiar?
i think the concern of the vendor is valid and would look at welding a blind on the inspection opening and do a pneumatic test @ LOW PRESSURE
Steven C
Senior Member
ThirdPartyInspections.com