[QUOTE=Steamer;141688]Why worry about glass? That is really pretty primitive when these things have been used on ships for ages:
http://koboldusa.com/products/level-measurement/nbk-bypass-level-indicator
I would also have a little talk with your ABS surveyor. There is nothing (at least that I know of) that says you have to have a “guage glass.” The rules only say that if there is one it must be flat glass and have self closing valves.
The only cylindrical sight glasses allowed are on hydraulic oil tanks.[/QUOTE]
Have a little talk with the ABS surveyor about where in the LL regs it sets rules for gauge glasses. If it does, I’d sure be happy to know.
LL is not ABS classed.