vragle
Mechanical
- Mar 26, 2015
- 6
I am evaluating a pressure vessel that operates at very low temperatures. It was built in 1982 and has been in what should be non corrosive service since that time. The original thickness was 1 inch. The latest thickness values range from .805 to .808 on the entire vessel. The thickness values were taken while it was in service. I have been out of the inspection and testing business for a long time and I know there are instruments that compensate for temperature, but usually it is high temperature that is the concern.
My question is, "Will very low temperature cause thickness readings to be lower that they actually are and if so, how much reduction in thickness might be expected? I just find it hard to believe that a 25 ft long by six foot diameter vessel can corrode so uniformly, particularly when it is in a service that should result in little or no corrosion.
My question is, "Will very low temperature cause thickness readings to be lower that they actually are and if so, how much reduction in thickness might be expected? I just find it hard to believe that a 25 ft long by six foot diameter vessel can corrode so uniformly, particularly when it is in a service that should result in little or no corrosion.
