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Hi Metengr, As I mentioned before, welded vessel can be safe as seamless if following the code. Again, it can be also some reasons that make it unsafe in the long run, for example, corrossion on the weld join, since welding may spoilt the material structure. Besides, there is also possibility...

It is know that seamless vessel will be always the best, but base on engineering calculation both is safe within the design thickness. However, base on safety point, there ma have some different. Thus, can anyone help to give me some safety factor between this two types of vessel.

HI Onno, Actually, Swagelok also purchases tubing from Rath. And by using chemically cleaned and passivated, tubing can be polished up to 10 to 40 micro inches. And ASTM G-93 is standard for fabricating tube according to thier thickness, material and so on. And CGA is Compressed Gas...

Thansk for prompt reply, actually, I have seen some of my colleagues did it before. But when talking about how to rectify the ice plug is built and how much of N2 is used, they just told me, when the pipe outside is in cover with ice then maintenance job can be started. Besides, most of the...

Exactly, most of the time I am doing piping for semi-con industry. So, depending on the requirement from my customer, we may do orbital welding, helium leak test, particle count, O2 and H2O analysis before charging the gas. Actually, what I am considering here is how to choose the material...

HI Onno, Actually, the piping job I am doing is most for N2, Ar, O2 , H2 and other special gases. So, our procedure is purging the line among the installation. And I can find the procedure for doing piping installation by using orbital welding, but I still cannot get the actual guide line to...

Hi, Have anyone experienced in doing water pipe freezing job? Pipe freezing job is mean that freezing water in the pipe till become as an ice plug to avoid water from one side to flow to the other side in the pipe so maintenance job can be proceed. So, what I would like to know, actually...

Hi Onno, It is really, I am using such incredibly surface roughness fpr my gas piping job. It is because we need to do the certified our line up to <10ppb O2 & H2O, <0.1 micron m3 particle. Anyway, can you please give me the work procedure or info about flux free vacuum brazing, Hi...

Hi Succes, Thanks for your prompt reply. Anyway, most of the time I am dealing with the surface roughness from 40 Ra till 10 Ra (micron inch). And also gases purity from 99% till 99.9999%. So, I am facing a problem, at what kind of gas purity I need to use what kind of surface roughness and...

Hi, Can any one give me some info for below question: 1) Guideline to choose correct surface roughness for different gas purity. 2) The maximum gas purity can be maintained for Threaded and Swagelok Compression connection. 3) The porosity of teflon tube can catch moisture up to how high...

Hi All, I am an project engineer who is conducting the Gas piping system for semiconductor or general industry. But Recently, I am interesting in the DI Water piping in pharma which need the orbital welding. So, can anyone let me know what are the specifications for the piping systems...

HI All, Thanks for your reply, how about I come out a senario for you all, please try to solve it for me. Type of Gas - Nitrogen No of Points of Use - 11 points Tool's Working Pressure / flowrate - 100 psig / 32cfm Main Line - 2" Droppers - 3/4" Supply Pressure - 120psig Pipe length for main...

Hi CRG, Thanks for your reply, As you know, while calculation the pressure drop we will use the equation which related to the initial P, Flowarate, gas density and so on... But, for this case should we use the Hardy Cross Network Analysis to calculate? Thanks Lee

Hi All, May I knw how to calculate pressure drop in the gas piping which is installed as a loop? Besides, for the piping with a lot of branches, how to calculate its pressure drop from the supplier untill the last point of use? actually, I have raise the question before, But I really don't...