Recent content by cespi82

Thank you pdiculous963 and marty007, I agree with you. r6155 Thank you for your reply, however I do not get your point. Can you please clarify? What exactly do you mean? Regards,

Hello everyone, What pressure value (Design Pressure or Maximum Allowable Working Pressure) should be used to calculate vessel's post construction minimum required thickness (Tmin)? If proving an example helps the understanding of the question, let's say that after reviewing the vessel...

Thank you all for your replies. At least a have an idea that there's nothing really sophisticated behind those values. Does any of you have access to that paper? If you do and do not mind sharing it, could you please email it to me? (cespinoza82@gmail.com) Kind regards!

Hello all! My understanding is that JE is the ratio of the strength of joint to the strength of the base material. I've been trying to find out how the Joint Efficiency (JE) values were determined by ASME? For example, how did ASME determined that for a Type 1 joint without radiography the JE...

Thank you XL83NL and BenStewart for your answers. It seems that this will be a research job... find older versions of B31.3 and build a sort of table with the changes over time of the stress values. If I ever manage to do that I will share it with you guys. Regards! Cesar

Hello everyone, Have the allowable stress values in ASME B31.3 changed along with the release of the different editions of this code? Can any of you route or guide me towards a historical reference or table where I can see the changes of the allowable stress values in time with the release of...

Hi Gents, The code 30 CFR 250.804 (now 880, or about to change) is stating that we need to test our PSVs every 12 months, which put us on a difficult situation. This code is governed by BSEE and only applies to the US portion of the Gulf of Mexico. Are any of you familiar with this code and/or...

Hello TGS4 and Mech2325, I will extend on the leaks as I think I caused some noise. The leaks are very seldom leaks in the tubes itself, specifically in the U-Bends (or return bends) and only in the two innermost rows. The leaks are due to Corrosion/Erosion but wall thickness rates are...

Hello everyone, I work for a company in the Middle East and there are a series of Heat Exchangers in my facilities that were originally design to operate under certain conditions that are not longer valid as the gas wells that feed the system where they are installed in have declined. The...

Thank you all for your comments/suggestions. NBrink, thanks... It seemed to me that I wasn't explaining my idea properly and that I was being misunderstood about the non metallic coating and hydrogen permeation. EdStainless / TGS4 / metengr, I got your point regarding cutting a piece of plate...

Just to clarify my previous post, the coating/metal overlay am talking about would be only in the Chimney tray area that is where we have liquid water accumulation in presence of H2S. This is about 3m heigh. I wouldn't be worried about HIC in other locations in the column. Aside that we extend...

Hi metengr, thanks for your reply. I thought about it, but if we plan to do any welding in this vessel that theoretically has been exposed to a Hydrogen Charging service for such a long period of time (35 years), shouldn't we do a preventive hydrogen bake-out procedure before? To do that we...

Thanks for your answers. TGS4, It was the first time that we performed UT scanning on that particular area. What it has been normally done as part of the inspection scope is spot UT gauging on TML's. I presume these indications were not found until now because OP were always gauging at the same...

Good morning Gentlemen, The situation is as follow: - Glycol Absorber Column in a Gas Dehydration Unit operating at 1100 psi and 40 Celsius degrees - Service: Wet Gas with around 400 ppm H2S - Commissioned in 1979, over 35 years in continue operation - Material of Construction: SA-516-70 - No...

Good day for all... I have a very experienced colleague in the refinery I work on that is affirming that Solid State Transformations also cause thickness reduction. Is this affirmation correct? The situation is that we have a failure in one steam generator tube (convection section) and the...