Hydrogen gas pipe.

admin

Has anyone here ever welded piping for gaseous hydrogen? Does anyone know where i can find articles or pictures of the materials and procedures used (welding processes, etc)?
Reply:actually if anyone used hydrogen to weld or heat things, or for any reasons id like to know about what happened.
Reply:Hydrogen is sometimes used in the automated welding of nickel alloys, and some CNC plasma cutting operations.   Other than that it's presence at a weld is usually very detrimental, such as with hydrogen embrittlement.Have we all gone mad?
Reply:seems to me we did an IBM project in the 80's involving a  3" copper line  and some very clean silversolder requirements...seem to recall they only wanted 20% penetration into the fitting...
Reply:Originally Posted by sn0border88Hydrogen is sometimes used in the automated welding of nickel alloys, and some CNC plasma cutting operations.   Other than that it's presence at a weld is usually very detrimental, such as with hydrogen embrittlement.
Reply:Hydrogen is commonly used as a coolant for machinery.  Liquid hydrogen has a specific heat 2.3x greater than water.  It greatly reduces the size requirements of some types of machinery such as electrical generators.
Reply:Originally Posted by 76GMC1500Hydrogen is commonly used as a coolant for machinery.  Liquid hydrogen has a specific heat 2.3x greater than water.  It greatly reduces the size requirements of some types of machinery such as electrical generators.
Reply:the hydrogen was not used for cooling, it was used in various processes.. pretty sure it was L copper, cleaned at a special facility and shipped with nitrogen in it...
Reply:Originally Posted by weldbeadthe hydrogen was not used for cooling, it was used in various processes.. pretty sure it was L copper, cleaned at a special facility and shipped with nitrogen in it...
Reply:standard copper socket fittings, just cleaned....
Reply:Originally Posted by lozootSo is it used as coverage gas or for cooling machine parts?
Reply:Originally Posted by weldbeadstandard copper socket fittings, just cleaned....
Reply:Originally Posted by lozootHas anyone here ever welded piping for gaseous hydrogen? Does anyone know where i can find articles or pictures of the materials and procedures used (welding processes, etc)?
Reply:We designed a small steam turbine driven hydrogen compressor system back in 2002.  I researched the piping codes for specifics but didn't find anything out of the ordinary then....basically steel piping per ASME B31.3.Now it looks like H2-specific piping specs are readily available.  Probably due to the renewed interest in H2-fueled vehicles.Here's what I just found by Google'ing "piping design for hydrogen".  These should help steer you toward any particular welding procedures.http://files.asme.org/catalog/stllc/printbook/20529.pdfhttp://www2.iccsafe.org/states/seatt...hapter%207.pdfhttp://avt.inel.gov/pdf/hydrogen/h2s..._appendixc.pdfBTW...I understand your question to be welding procedures FOR hydrogen piping and not welding procedures using hydrogen gas.Miller 211 w/ spool gunMiller Dynasty 200DXLongevity 60i IGBT plasmaO/A w/ crappy chinese torch/gaugesSouth Bend 10K latheGrizzly 4029 10x54 millGrizzly 7x12 hor bandsawangle grnders, bench grnder, bench belt sndr7.5 hp 80gal cmprsor
Reply:Originally Posted by Donald BranscomI would call the American Welding Society, and go to a good library and look in the section with all of the SAE papers and there will be a paper written on it.Sonoma State University in Rohnert Park, California has a SAE papers section.Go to www.weldreality.comFor AUTOMATED welding."Consider argon with 5 - 30% hydrogen if you want more weld wetting or faster  weld speeds. Remember an increase in weld speed may have little value if the weld cycle time is measured in seconds. The hydrogen addition to argon can increase arc stability on specific, very thin low amp applications less than10 amps. When welding specific alloy steels with hydrogen gas, be beware of the potential for hydrogen embrittlement. Hydrogen can also decrease the potential life of the tungsten, depending on the hydrogen content and tungsten type."Lots of info on the internet.
Reply:When I read a post like this I think of the security training given at DOE, NNSA, and DOD facilities about internet technology phishing that originates from terrorist states and countries that compete with the U.S. economically and politically.TeddCoHTP Microcut 400 & Invertig 160DC  Smith Dual Guard MD-510 OA Rig  Lincoln SP135+  Hobart Stickmate LX 235/160
Reply:Originally Posted by TeddcoWhen I read a post like this I think of the security training given at DOE, NNSA, and DOD facilities about internet technology phishing that originates from terrorist states and countries that compete with the U.S. economically and politically.
Reply:Originally Posted by lozootdo you know of any fittings, piping, or manifolding used to transport the liquid hydrogen to the machines you speak of.?
Reply:Originally Posted by 76GMC1500They typically generate on site and have a few small comrpessors to compress for storage.  Beyond that, I know almost nothing.  Umm... all of this hydrogen embrittlement speak is kind of nonsense.  I mean,  they store in steel cylinders and I'm sure the pipes were steel, too.
Reply:When welding on Austenetic stainless steel preventing hydrogen embrittlement is always a concern.Flashback arrester for 1/4 inch stainless line?AWS certified welding inspectorAWS certified welder
Reply:When welding on Austenitic stainless steel, preventing hydrogen embrittlement is always a concern.Flashback arrester for 1/4 inch stainless line?Did you want threaded or quick disconnect?Easy to get on the internet.[ame]http://www.youtube.com/watch?v=CHCMFnNCJJo[/ame]You have one of the most valuable tools at your fingertips. The internet.Last edited by Donald Branscom; 01-25-2011 at 10:06 AM.AWS certified welding inspectorAWS certified welder
Reply:Originally Posted by lozoot:/EDIT:Has anyone ever seen a low pressure storage tank for hydrgen?
Reply:Originally Posted by Donald BranscomWhen welding on Austenitic stainless steel, preventing hydrogen embrittlement is always a concern.Flashback arrester for 1/4 inch stainless line?Did you want threaded or quick disconnect?Easy to get on the internet.You have one of the most valuable tools at your fingertips. The internet.
Reply:Originally Posted by Donald BranscomWhen welding on Austenetic stainless steel preventing hydrogen embrittlement is always a concern.