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  1. EdStainless

    Cathodic protection bare stainless steel 316

    The real issue with CP on buried SS is that you need very uniform coverage. Since pitting is a very localized phenomenon people often use a full mesh grid for the electrode. It is a real pain in the butt.
  2. EdStainless

    is PWHT the "fabrication heat treatment" ?

    If you HT after the MTRs are generated then you need to re-test.
  3. EdStainless

    WPS experation date

    This is similar to manufacturing processes. No quality system has requirements for updating them. But if the applicable specification change then they need to be revised.
  4. EdStainless

    Bend Test for Aluminum Bronze

    Just be careful with the radius of the bend.
  5. EdStainless

    2205 Duplex stainless steel maximum sub zero temperature

    The risks of low temp only apply while you are actually cold. Though if a crack initiates then it is there. The high temp damage is cumulative. I did work with superferritic alloys (same mechanism). Saw a failure after 15 years of service. It was reaching about 370C for roughly 15min twice a...
  6. EdStainless

    Air Jet Weaving

    You need to longitudinally polish the ID. I know that real ones are made that way. I believe that some are done by ExtrudeHone.
  7. EdStainless

    Air Jet Weaving

    Let me guess, your build layers are in the x-y plane. If so what have you done to polish the interior after making it? All of those little ripples will cause terrible flow. Toyota solved this 50 years ago. Is none of that info in the public domain?
  8. EdStainless

    Designation and Reporting of % Elongation in Metals Tensile Test Data

    Is this all just ASTM work? If so then just report it as 4d and move on. I have had the other issue, AMS specs that require 2" gage length and parts that only 0.1375" in diameter. It is very difficult to meet elongation in that situation.
  9. EdStainless

    2205 Duplex stainless steel maximum sub zero temperature

    I have seen pieces of good quality plate that would have good impact toughness at -55C, and that would take >5 years to develop intermetallics at 310C. But the same is not true of fabricated items. Once you make a weld that you cannot solution anneal and quench all bets are off. And living with...
  10. EdStainless

    NDT performed after or before Hydrotest test

    NDT (all methods) detects indications. Whether or not these are of concern depends on your standards. Verifying what these indications are requires some destructive examination. We always did NDT prior to Hydro. for a couple of reasons. 1. Much easier to repair things while they are dry 2. To...
  11. EdStainless

    Mechanical properties in heavy thick test coupons.....

    What HT condition? In some materials/applications I have take coupons at various depths to verify properties. Meeting the impact at all locations will be difficult.
  12. EdStainless

    Technical Opinion on SS304 Potable Water Line Leakage

    I wouldn't trust generic 316L at 200ppm Cl. You can get it to work but it takes a lot of technical tricks. The welded pipe needs to have very lower residual delta ferrite in the welds, <0.5%. Your welding in the field needs to all be automated orbital with a well developed process. In sch10 I...
  13. EdStainless

    Arc Spray to Face of Thrust Collar Base Metal : SS304

    What is the purpose of the overlay? This isn't a code issue it is an application issue. If this isn't a pressure boundary the Code doesn't care. What was on it before? Did it work? I hope that the loads are very low. 304 is soft and makes a poor substrate.
  14. EdStainless

    How to make initial sizing calculations for a regenerative turbine pump?

    There are many papers about the recovery units used in RO. There is a small group of companies that build these. I would talk with one of them.
  15. EdStainless

    The S31254 super stainless steel plate was subjected to a welding process procedure experiment, with bending fracture

    How many weld passes? What inspection between passes? Control of interpass temperature? Sounds like a weld procedure issue to me. 254 is straightforward to weld and there is a lot of information out there.
  16. EdStainless

    Duplx 2205 vs XM-19 (nitronic 50)

    Actually it should machine better if it was harder. It would work harden less when being machined. But it take a lot of hp to cut this material.
  17. EdStainless

    Duplx 2205 vs XM-19 (nitronic 50)

    Are they both annealed? If so then I would suspect that 2205 will machine better than Nit50. The Nitronic will work harden a lot in machining which makes life difficult. 2205 has noticeably better pitting resistance than Nit50. We are looking at a PREn of about 31.5 for Nit50 and 34 for 2205.
  18. EdStainless

    Is intergranular corrosion test required for duplex steel

    An IGA test is not testing corrosion resistance, it is looking for detrimental secondary phases. But A262 is not a direct measure, you are actually testing the Cr depletion around the carbides. In fact if you sensitize at a high temp there will be no Cr deletion (diffusion will fix that) and no...
  19. EdStainless

    Sizing Generator- Florida Nursery

    Well motors draw significant start current. Between the poor motor geometry (longer and smaller diameter than usual) and the length of cable it can be a real issue starting them. Double checking actual voltages is very critical.
  20. EdStainless

    Cooling mixing tanks with a chiller, selecting chiller size

    As I recall our air cooler was a radiator made for a stationary diesel application. The fan for it was 5hp (or maybe 8hp), on VFD with speed based on temperature drop across it. We tried this with just air coolers but with summer ambient around 30C the cooling rates became painfully slow below...

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