judging pipe corrosion

[gwapa]

Jim
Some time I like to sleep well without any worry

If the pipe is a small pipe I will change it and sleep well

If you have a big suction pipe some time I have required a NDA (Non Destructive Analisys). We use an ultrasonic method to detect the minimun wall thinckness. You have to be aware that the pitting could be very deep some time.Becareful

After that came the question: What happend if you have a big leak and you knew the pipe was corroted?
What will happen if somebody dead?

I prefer change the pipe.It cost nothing
Gwapa

[NH3LVR]

This brings up the issue of Vapor sealing and its importance. I removed some suction line that was 30 years old. I had insulated it with Aramflex closed cell myself. The pipe was painted before the Aramflex was applied.
After 30 years the pipe was in good condition. As I recall we used flat sheets cut to size and glued it to the pipe.
Of course this plant runs 24/7 so the line was always frozen.
This is a success story. Your results may vary.
I know of one company in the cold storage construction business that does not paint pipe, nor do they vapor seal the plastic jacket. It looks OK from the ground, but if you climb on top of the vertical vessels you will only see foam.
10 years-probably OK
15 years-maybe OK
20 years-not OK