Went through a few yard periods and a major overhaul. All the yard workers had white coveralls and breathing masks. We had our seafarers and chambray shirts. Anytime we worked on pumps, blowers, valves, etc., you had to rip off the old asbestos coverings. When done you had to put the pre-formed blocks on the piping, mix the powdered mud to coat them, wrap with asbestos cloth, then paint and re-stencil the lines. I was in the Navy's asbestos program until I turned 45. X-rays and spiro tests every year. After I turned 45, they said you don't get checked anymore. No sign of asbestosis to this day.