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- Bring a new dewar down to the hutch that needs the replacement. Do not ride on the elevator with it!
- Put a the ODM onto the dewar, don't put it right in front of a PRV.
- Teflon tape the horizontal vent valve with the NPT fitting.
- Screw on the "T" manifold and firmly tighten it.
- Roll the dewar into position, if you need to place it on a scale use two people. Be sure to point the "T" manifold in such a way that won't hinder or spay people as the pass by.
- Take off the black cap on the vertical vent valve (keep it nearby) and snip the ziptie on the Low Pressure Relief Valve
- Rip off the "full" tag
- Strap the dewar down with a speed strap.
- Note down dewar's weight.
- Deploy a ladder nearby the dewar so one person could easily reach ~ 6ft over the top of it.
- Both people put on all PPE.
- Open the vertical vent valve.
- Grab the stinger and allow one person to climb the ladder then hand the stinger to them.
- With both of you, guide the stinger into the vertical valve all the way to the bottom. Go slowly as the helium will boil off and the pressure will rise. Try not to stand in front of the PRVs and keep the low pressure PRV closed unless you can stand off to the side of it.
- Once it is as far as it goes ,start to close the sealing gasket on the stinger. You may have to wiggle it to get the threads to spin.
- Note down the dewars weight if on a scale.
