On 2/17/2016 6:22 AM, TimR wrote:
On Wednesday, February 17, 2016 at 1:07:06 AM UTC-5, Don Y wrote:
On 2/16/2016 9:10 PM, TimR wrote:
On Tuesday, February 16, 2016 at 7:06:58 PM UTC-5, Don Y wrote:
(many tanks are glass lined; metal into glass is a big FAIL)


I think "glass" is most likely "fiberglas." Can't imagine transporting a real glass tank without breaking it.

No, it's real glass (fused to the metal tank).

Huh, you may be right.
https://www.youtube.com/watch?v=nyIjwMdD1JY

Now, imagine trying to remove -- for the purpose of repair -- something that
screws *into* a hole MANUFACTURED in that "glass bowl"... without cracking
the glass (which won't cause it to leak, in itself, but *will* eventually
defeat the purpose of the glass (preventing corrosion of the supporting metal)
and cause a premature failure.

The same is true of the temperature/pressure relief valve on the top of
the tank (and the sacrificial anode which screws in from above).

I.e., the SUGGESTED maintenance activities all pose significant risk.