News from the Tank Farm

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Turret stanchions waiting for their turned to be cleaned.

Work has been progressing nicely out in the Tank Farm. After a week in Tank 1 with the copper alloy artifacts, we refilled the tank with fresh solution, covered it back up with a tarp and moved into Tank 6. Tank 6 and 5 (which we were into this week) hold wrought iron artifacts. They all received a through cleaned via dry ice blasting, which is rapidly becoming one of my new favorite things.

One of the most exciting things about dry ice blasting these artifacts is that removing concretion often reveals previously hidden features. This has been the case for two artifacts in the last two weeks. The first was one of the stanchions off of the turret.   Read more

Dry Ice Blasting

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This post is coming out a little later than I wanted it to, but we have had a very busy few weeks here in the lab. We had some outdoor projects to finish before the weather turned cold. Some of our activities in the last few weeks have included assembling and installing a new anode rig in the tank holding the pieces we used to test the dry ice blasting, winterizing the tank farm and having adventures in the skeg tank. The skeg tank adventures will get their own post after Thanksgiving, today I want to tell you about dry ice blasting.

We were fortunate enough to have the opportunity to try out a SDI Select 60 dry ice blaster from Cold Jet. The set up for this machine is not overly complicated. You hook it up to an air compressor; load the hopper with either dry ice pellets or blocks, in our case we found that pellets worked better, the block or pellets are pressed into an auger that shaves them and then the shaved pieces are fired down a hose and out a nozzle held by an operator. The system set up is not so different from other abrasive cleaning methods, but the unique thing about dry ice blasting is that there is no aggregate left at the end to clean up. If you are doing abrasive cleaning using glass beads, sand, ground walnut shell or any other medium you will have to clean bits of that medium off of your object when you’re done. You get to skip this step with dry ice blasting since your medium just sublimates away.   Read more