Thankyou both for your responses - the levels we are detecting are around 20 ppm at most. Thanks for the confirmation that this is sufficient to cause the problem.
We have linked 316L failures to stress corrosion cracking but we only appear to have low chloride levels.
What levels of chlorides could be expected to cause corrosion in 316L stainless steel containing 30% acetic acid solutions at around 40 degrees centigrade?
Could the Palintest for...