Nitrogen Service for new vessels

[Seeker88]

Hi folks,

Just a quick question to ask if there are any specific concerns that need to be cosnidered when welding Carbon Steel components together for nozzles, dished ends etc in Nitrogen service. Design temp is minus 20 deg C and the operating pressure is less than 4 barg.

We are using P1 or P11 materials and have qualified procedures with impacts etc, WPS docs and welders for the codes (ASME). Although we are highly experienced ASME fabricators we are not used to working with equipment in Nitrogen service and just need to make usre there is nothing extra in terms of weld preparation, joint design or NDT that we are not aware of.

Any guidance would be greatly appreciated

Thank you

 

[marty007]

Nitrogen is about the most benign service you could ask for. That's in part why some companies ask for vessels to be nitrogen purged for shipment.

Nothing special to consider here.

 

[0707]

Yep I agree with marty007

luis

 

I've built 1.5" thick SA-516-70 steel bullets for nitrogen storage; I don't recall any special requirements for it.
Contruction from P11 steel should not add any difficulties other than the usual precautions when welding.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."