Design, Fab, & Inspection Requirements for non-Code "Vessel"?
Design, Fab, & Inspection Requirements for non-Code "Vessel"?
(OP)
Hi guys. I'd like to hear opinions/experience on design and fabrication requirements for a non-ASME Code "vessel".
The "vessel" in question is a discharge separator for a liquid-ring vacuum pump. Operates at atmosphere and ambient temperature, 304SS construction, RFSO flanges, no PSV, no instruments or controls, 6' OAL x 22" diameter, flat bottom, 2:1 top head. Anchorage is by feet/brackets welded to the shell and bottom, and bolted to the concrete foundation. Foundation and anchorage will be engineered and permitted (it's located in the People's Republik of Kalifornia).
I am struggling with how to communicate requirements to the vendor. Beyond telling him, say, 15 psig MAWP, hydrotest to 1.5 x MAWP, RT 10% of all pressure boundary welds, clean and prep for shipment, provide seismic calcs for the supports, what else could I say? I am concerned about taking his offerring "off-the-shelf". My common sense tells me it's OK to do that since the risk to personnel is very low should there be some type of failure, e.g. a weld seam opens.
Thanks guys! Pete
The "vessel" in question is a discharge separator for a liquid-ring vacuum pump. Operates at atmosphere and ambient temperature, 304SS construction, RFSO flanges, no PSV, no instruments or controls, 6' OAL x 22" diameter, flat bottom, 2:1 top head. Anchorage is by feet/brackets welded to the shell and bottom, and bolted to the concrete foundation. Foundation and anchorage will be engineered and permitted (it's located in the People's Republik of Kalifornia).
I am struggling with how to communicate requirements to the vendor. Beyond telling him, say, 15 psig MAWP, hydrotest to 1.5 x MAWP, RT 10% of all pressure boundary welds, clean and prep for shipment, provide seismic calcs for the supports, what else could I say? I am concerned about taking his offerring "off-the-shelf". My common sense tells me it's OK to do that since the risk to personnel is very low should there be some type of failure, e.g. a weld seam opens.
Thanks guys! Pete





RE: Design, Fab, & Inspection Requirements for non-Code "Vessel"?
It sounds to me more like this is just a tank, so I would look up the requirements for something like an API 650 tank for atmospheric or 620 if you really want to give it a pressure rating.
Normally you just fill it with water to max liquid level and if I doesn't leak or fall apart then it's good to go. If you add extra requirements then you're paying for something you're not going to use.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Design, Fab, & Inspection Requirements for non-Code "Vessel"?
I would omit the radiography in this case.
If you could adapt your design to some ready-made equipment, it might simplify things for all concerned: https://www.mcmaster.com/#stainless-steel-tanks/=1...
RE: Design, Fab, & Inspection Requirements for non-Code "Vessel"?
100% filled with water in vertical position to check leaks. Quality of water must be under control.
All welds in shell and nozzles: full penetration.
Minimum thickness of shell and heads : 0,5 mm (check for seismic).
Supports: 3 pipe legs
Regards
r6155
RE: Design, Fab, & Inspection Requirements for non-Code "Vessel"?