Need some advise,im going to look at a weld job on a alum,Tank that has held liguid nitrogen.seems it had a leak around a ball valve in the main structure.The customer said the tank is in the range of 4000 gal.only a little product is left in the tank.theres a fill opening in the top that can be unbolted to vent before welding.i plan on making a patch to weld over the bad area,then retap for a new ball valve.Before i attempt the job im trying to get any info on the liguid nitrogen.The tank is outside in the open.The repair is on the side close to the bottom of the tank.i was told the the tank can be tilted some to keep what product thats still in the tank away from the weld area.(may only be around 50 gal or so left that cant be pumped.)any information would be helpful....
Welder99..
Welder99..

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