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Hello Pradip Thanks for your input. All welding is completed on this vessel apart from one rejected nozzle. Awaiting the replacement and weld in before carrying out the PWHT. We assume all welding has been performed properly. Assuming everything has been done properly... Is there any...

Weldstan - Thanks for your good advice We are following API 934 Part C as well as ASME VIII Div 2 for this vessel. DHT is being applied for this vessel per my initial post and that is applied for all pressure welds apart from the SS/HA Tail Pipe which is welded on after PWHT to a 800H...

In this case there is MT/UT/TOFD-UT before PWHT, MT and UT after PWHT and same again after Hydro Test. Totally agree with you, but doesn't catch everything as past experience with this item and service has shown.

Matengr - OK - that is inline with my thinking too... however the report I mention in my original post is of a different opinion and it concerned me enough to seek the opinion and experience of others. Again sincere thanks.

Metengr - Thanks for your reply. Vessel is still in Fabricators at this time awaiting a replacement for a part that cracked after welding.

CLOA - Thank for your guidance on how to avoid hydrogen pick up during welding. Good point often overlooked. Your other comments are appreciated. My main concern remains: Is it OK to delay by 2 months the PWHT of a 1.25Cr 0.5Mo Pressure Vessel with a wall thickness of up to 133 mm (in...

Is it inadvisable (or bad practice) to delay PWHT of a 1.25Cr0.5Mo Pressure Vessel with a wall thickness of up to 133mm (Hydrogen Service)? Low hydrogen consumables have been used. Appropriate Pre-Heats and post heating / DHT have been applied. Why is this even a concern? Logically, since on...

I don't think 19ppm of lead is necessarily a high lead content. Lead is not normally specified for any SS products that I deal with on a day to day basis as an Inspector here in Japan. It is routinely low by virtue of the melting methods used to produce the mother billets....Is there some reason...

unclesyd I got hold of the ASTM A 262. Standard Practice for Detecting Susceptability to Intergranular Attack. The oxalic acid etch test is a rapid method of identifying by simple etching those specimens of certain steel grades which are essentially free of susceptability to intergranular...

TVP Thanks for your comment. I guess my question was is it normal procedure to subject a microspecimen to an etch test at 1A/cm2 & 1.5 minutes....as opposed to usual electrolytic etching of SS using 10% Oxalic Acid and a lower current density and short time, say 10-15 seconds. ASTM A262(?)...

Hi Why not talk with the folks at Stamicarbon at Geleen in the Netherlands. Web Search will give you easy contacts. Good man for answering any questions on this subject is Jo Eigenboom.... I might be able to help if you don't want to talk with Stamicarbon directly. deics

unclesyd That's useful information about the cleaning solutions which I will pass on and make use of in our investigations. I never laugh at shop floor experience. They have to do the stuff I only ever read about in books. Eyeball and brain ar unbeatable combination.Operators have both of...

mcguire That is also a useful point of view on the BA vs Pickled Condition. I really appreciate that. The reason we got where we are on this is because the internally applied ECT found the problem in the first instance and visual checking latched on afterwards as to what was going on plus a...

Kenvlach In this case they used a 10% Oxalic Electrolytic Etch. One thing I wondered about is if the lab had over-etched. The unetched condition did not look so bad at the surface. The Mill is very old experienced firm and their cleaning is performed correctly as far as we can ascertain...

mcguire The first pickle was the Mill pickle the second was our attempt to get rid of the dark stuff before we had seen the optical micros. This was not a diffraction effect.There was definitely a residue remaining on the tube. It's one of the reasons why we re-pickled a tube sample that...

Unclesyd The pickle was reported from the Mill.I am not sure what the % of Nitric was. Something might have been lost in the translation.Japanese! I'll check and get back to you. It's a cold pickle. Room temperature. I was surprised at the duration but that was double checked. Maybe the tubes...

Problem - After a tube leaked in a new exchanger under a hydro test all tubes were checked with ECT and some were found to give indications above reference level. Tubes were checked by fiberscope. Spiral marks resembling roll straightener marks were seen in the bores. The tube that leaked had...