GOT THIS IN EMAIL TODAY 4

[vesselfab]

A un-verified account of failure during hydrotest of vessel in China. Folks, please be aware of material and workmanship problems in China and other countries as well.

Again, this is un-verified, but from a pretty reliable source.

 

[jistre]

I've been reading up on P91 a little, and I'm curious to see what our combined experiences with it are.

From what I understand, it's great stuff when handled, used, and the process is monitored correctly. However, the properties of the metal depend so sensitively on the microstructure of the alloy, that any sort of oversight in initial heat treatment, providing capability to isolate in some way entire sections for PWHT, process temperature excursions, etc. can be a recipe for disaster. Since testing for proper heat treatment is something that is so difficult to do, it's very easy for weakened parts to enter operation.

At least that's what I've gathered. I don't know the answers completely, so I'm going to use a help here and Poll the Mob!

What have you guys encountered/experienced?

 

[PAN]

I used to visit several fabrication shops in China. Some of them are good (or bad).

Last week, I visited a fabrication shop in US. This company is certified by ISO 9001. However, the quality is not acceptable to me. For an example, material for my project is austenitic stainless steel. I found that the manufacturer forgot to control chloride content of test water. The test was carried out 2 weeks before my visit. After notice the problem, the manufacturer (QA/QC team) sent water to laboratory and attached new water analysis report for support the previous pressure test result.

I cannot blame to any countries. This depends on ethics and their skill.