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Does anyone know of companies that sell retractable corrosion racks that you can put multiple u-bend coupons on (we'd like to test a few different materials)? I've been searching on the internet and have only found racks for flat specimens and they can't handle multiple samples. Please help!

Thanks everyone for the help! You have put me on the right track!

I have searched and searched and I can't find anything related to 2 1/4Cr and erosion. Actually, I can't find a whole lot of information on 2 1/4Cr in general (not related to high temperature anyway). I also can't find any corrosion data for 2 1/4Cr and naphtha. Any advice on where I can...

Well, it looks more like mechanical damage but I don't think I'd rule out corrosion entirely. We run Naphtha through the exchanger. A colleague brought up using 2 1/4Cr but I have not heard of using this alloy to solve erosion problems...does anyone know if 2 1/4Cr can help with...

Hi- We've had problems with a heat exchanger failing from erosion corrosion near the inlet. It's constructed from carbon steel so it doesn't offer much resistance to this mechanism. We can't change the process conditions or the piping configuration so I thought it would be best to either use...

Oh, good! I'm relieved to hear the answers. Thanks for all of the help!!

I have a question about the microstructure of A193 B6. It is listed as a ferritic steel under the spec. Isn't B6 410SS which has a martensitic structure? I'm confused as to why it says ferritic instead of martensitic. Does the heat treatment transform in into a ferritic structure?

Hi Ed, I'm not too familiar with microbial growth/corrosion and had a question. I'm assuming microbiological corrosion is harmful for either stainless or PVC right? Or would PVC be more resistant to this type of corrosion?

Hi Ed, Thanks for the info. Do you think the amount of Chlorides are fairly negligible in this case?

Hi! We are looking at putting in some new piping and filters in our new potable water system and have a few questions on material selection (our galvanized carbon steel is very corroded and we need this section replaced). The water will have a pH between 7.5 and 9.1. The project manager was...

Yeah, I was worried about the effects of residual chlorine causing SCC. Is that something I should not worry about? Basically, I've been asked to say under what operating conditions it is ok to weld on chlorinated lines. They are looking to know what ppm of chlorides and at what temperature...

I was asked to give choride content limits and temperature limits for welding chlorinated lines in-service. As far as I know, this should not be done at all in-service. Are there situations where it is ok to hot-tap chlorinated lines? If not, are there any codes/documents related to...

Hello, I have always assumed that 316SS is an upgrade to 304SS. One of our mechanical engineers informed me that in some cases 304SS is more corrosion resistant than the 316SS. I was a little surprised since they are so similar. Can anyone give me any more information on this? I was reading...

I actually did have one last question...can materials that are not specifically stated in the ASTM spec to be used in low temperature service still be used at low temperatures if we know the properties are fine at low temps? Does 316 and 304 stainless steel not need to be impact charpy tested...

metengr- Thanks for the help! I am not familiar with the code but hope to be (graduated college a year ago). I would be recommending a material to the Mechanical Engineer and he would be evaluating the overall suitability based on the other variables you mentioned. I'm just making a...

Metengr...yes this vessel should be built according to that code. Is there somewhere in that code that requires certain materials? Is there something in the code that would not allow us to change to a stainless steel?

methanol

This is a heat exchanger and I am wondering about the tubing inside of the exchanger.

Hi All, I have been asked to see if we could substitute A334 gr.3 for a different material because of the cost and availability of this material. The equipment is designed for -100 F and 620 PSI. I haven't had much luck looking through other ASTM specs to find an appropriate substitute and...

Thanks for the advice. When I first took this position I was under the impression that I would be working with a more experienced metallurgist but he has since left the position. It has been quite the learning curve and I do work with other engineers on these decisions. I have also utilized...