Aluminum pipe project I got recently

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Nothing spectacular, but I rarely do pipe work.The threaded flanges are home built as well. Attached Images
Reply:Are those steel flanges?  Any issues with dissimilar metals in threaded contact with each other in your application?
Reply:Yes the flanges are mild steel, I made a set of aluminum flanges originally but they wouldn't seal with the valves when tightened, kept bending at the bolt holes. (over tightening i suspect)So i made my last few with steel flanges and used a liberal amount of copr coat on the threads.
Reply:If the flanges are distorting, make them out of thicker steel.  I think ASME publishes standards for flange thickness.
Reply:Originally Posted by 76GMC1500If the flanges are distorting, make them out of thicker steel. ...
Reply:looks like a fun project summer is here, plant a tree for mother earth. if you dont have time or space, sponcer some one else to plant one for you.feel free to shoot me a PM or e-mail me at [email][email protected] i got lots of time.
Reply:they are used during cement operations on oil wells. when they have a particularily large job they sometimes need to tie into two sources of powder cement. this wye isolates the two during the job so they can switch between them without interrupting their work.
Reply:Hmmm, powdered cement?  Cement is alkaline, alkaline materials dissolve and corrode aluminum.Add in the different materials used just in the pipe and flange and I personally think the selected materials are pretty much all wrong for the job on multiple levels.Now your welding looked pretty in the pictures, but I think the materials selected are not really right for the job.Stainless steel pipe and flanges would be -waaay- better matched to the physical and chemical environment the piece is going to be used in.  IMHO.