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welding a hydraulic tank

13K views 23 replies 15 participants last post by  denrep  
#1 ·
I have a 80 gallon hydraulic tank on a drilling rig that feeds 4 pumps Im upsizing one circuit from 18 gpm to 29. the hydraulic tank is precharged with 10 psi of air to help feed the pumps. I have a 3/4" port for the feed line to the pump it had a 3/4" hose for the intake. Im thinking I need to upsize the port in the tank. its .250 wall on the tank. the question is how can I weld a bung on it while it has about 20 gallons in it. i was thinking about welding the bung and then drilling with a hole saw through the middle of it. just trying to figure out how to make sure it doesnt go boom. pulling the tank out and draining it is a 40 hour job needing a crane. so I need ideas if its possible to do it in place I dont have access to the inside to put in a bulkhead fitting. thanks for any advice.
 
Discussion starter · #6 · (Edited)
I would like to build a new one but this thing has about 16 ports on it, internal filters, baffles, and other things on it. I know they weld on main gas lines live just trying to figure out how its done. as for the fitting I can weld it to the outside before the hole is bored so its just welded to the outside of the tank
 
Discussion starter · #10 ·
I knew someone here would have a duh fix for it. thank you welderj that will work perfect.
 
Discussion starter · #14 ·
most of the cuttings will flow out when the bit passes through I already have dumped about 40 gallons of oil on the floor from leaks(this is a new rig to me and we are doing all the repairs from years of abuse and from a couple of years of sitting). A couple of big magnets on the base of the tank aught to trap everything else right?
 
Discussion starter · #15 · (Edited)
tool maker I was worried about having a poof, my wifes a widow moment. when you did those was the tank full of fluid above your welding point or was it below I can fill the tank back up above the port height if needed? its a pressurized tank very little air movement when the compressor is not running. there is over pressure relief but no fresh air intank without the rig running
 
Discussion starter · #22 ·
I got it welded in. I drilled it out and took the wirefeed bottle plumbed it in and let it run for a 100PSI worth then welded it over a 15 minute stretch with 1/16 +P rod had just a little flame were the oil would boil over and leak out the unwelded part of the weld outlet. a new computer to me so Im having issues with the pictures. thanks for all the advice and help