Need Help on Drafting Abbreviation

[archimedez]

I have an old drawing from the 50's of a vacuum tower that is carbon steel with a alloy liner on the inside of the shell. I know the liner is either 410S or 317 S.S. The liner is called out on the drawing as a 5/64" thk U.M. liner.

At this point I am not sure if the liner is Cladding, Weld Overlay or a sheet liner because I can only find a very few drawings for this item. What I would like to find out, if anyone knows, is what the U.M. stands for. Is anyone familiar with this abbreviation?

 

[vesselfab]

U.M is an old welding abreviation.

Don't remember what it stands for, just that it was welding.

Stands to reason with a vacuumn tower.

 

[BUTCHCWIQAM]

I believe the U.M. stands for Unmatched Material and also believe that this is a liner... but on your drawings do you show any welding symbols for this area... You can tell what the material is if you get a Third party Inspection Company that has a positive material Identification gun they will be able to tell you what the material composition is. I hope this helped

 

[vesselfab]

in the old days, was union melt, early submerged arc with bare wire /flux automatically fed.

 

[roca]

would you have a loose liner on a vacuum column?

 

[archimedez]

At this time the column is still in service. Will have to wait for the Turnaround to get inside and inspect. I suspect that what we have is weld metal overlay of some type won't know the exact material until we do PMI during turnaround. I did not mean to imply a loose liner but some of the Vac. columns have sheet liners that are plug welded to the shell and with a fillet around the O.S. edge of the sheet.

We are going to be installing several new nozzles in this column and I am just trying to prepare in advance of the TAR. I would like to avoid any surprises and was not familiar with this abbreviation. Thanks to those who responded.

 

[doct9960]

5/64" thk. liner? Seems too thin for cladding or weld overlay. It's probably some kind of paintlike coating.