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Recent content by EdStainless

  1. EdStainless

    Welding Joint Repair

    What are your clients rules about weld repair? Commonly you would have to grind it out, then perform NDT to show that you are into sound metal, and then re-weld.
  2. EdStainless

    Difference Between Cladding & Overlay

    See, to me clad infers a metallurgical bond, such as explosive welding or hot rolled. If it is loose or just held in place mechanically then it is what? Wallpaper? Lining? There are just too many options. And the performance/risks/limitations are very different.
  3. EdStainless

    what creates stainless steel 304 wire spring back?

    They are interchangeable unless you need 302 class 2 which is stress relieved. Stress relieving high strength wire generally increases the UTS. The alloys listed in A313 fall into three broad groups. 305, 316, 321, and 347 are slightly lower strength (for 0.060" about 250ksi) 17-4PH and 455 have...
  4. EdStainless

    Difference Between Cladding & Overlay

    Both can be done multiple ways. Give us more info.
  5. EdStainless

    Tri-clamp unit

    TC are nice, but they are not pressure vessel components. The pressure rating of the ferrules, flanges, clamps, and seals are all very 'how are you doin'. And no two companies parts are compatible with each other. I have worked with companies that have various in-house limits, some as low as...
  6. EdStainless

    SAW vs EFW Process

    What is your specification? It should tell you what is allowed.
  7. EdStainless

    static mixer

    More elements with slightly more pressure drop infers that the mixing will be more through. Do you really want to use a coated one? Are you injecting liquid 2 through a centerline quill?
  8. EdStainless

    PE/PP in Concentrated Sulfuric Acid Service

    The real message about "long term performance" includes expected lifetime and the risks of failure. As you can see from the above (from the MTI Materials Selector MS-1) that temperature and acid concentration are critical. Be careful. Most sulfuric users prohibit the use of PE in any service.
  9. EdStainless

    Looking to replace inductive prox switch in demanding application

    Your targets need to be identical, dimensions, shape, material, and anything else possible. A bit of slight difference can cause a lot of issues with triggering. We had a customer that made systems for paper machines and they used similar flags for triggering. They sent us some steel bar to...
  10. EdStainless

    what creates stainless steel 304 wire spring back?

    Just a word of caution. The terms 1/4 hard, 1/2 hard, full hard and so on only apply to flat rolled product. Wire has it's own specifications (such as ASTM A313) and the specified tensile strength is a function of the wire diameter. We used to draw 304ELI to 500ksi tensile, but it was 0.004"...
  11. EdStainless

    Corrosion(?) on stainless at a waste water plant

    If it is a big deal to go out there then make sure to do it all. Take new abrasive scotchbite pads, pickling paste (from a welding supply store) and all of the PPE. Trust me, this paste will take you skin off down to the bone in seconds, don't mess around. And then wash it all down very well...
  12. EdStainless

    Corrosion(?) on stainless at a waste water plant

    If this is all superficial then there are ways to clean it up. Clean it with fresh abrasive and then wipe down with pickling paste and then wash well. But the bottom line is that 304 is barely corrosion resistant. This is why duplex SS has become so popular. My hunch is that they have gotten it...
  13. EdStainless

    When would piping need to be replaced due to an overpressure event where the Yield Stress was exceeded?

    First, some yielding starts at very low stress. Annealed steel will show some small permanent deformation well below 0.2% strain. Secondly most actual material is significantly stronger than the spec minimums. My world was mostly SS and we had specs with minimums of 25ksi Yield/70ksi UTS and we...
  14. EdStainless

    what creates stainless steel 304 wire spring back?

    Hard SS wire is regularly formed on various spring forming machines. If you are accustom to forming steel spring wire the SS will have more spring back.
  15. EdStainless

    Backup fuel for pilot

    We used a lot of hydrogen in a process and to burn off excess. Out flare had natgas for the primary and bottled hydrogen for the secondary. We could have used propane or anything compatible with the pilot burner but we had hydrogen. If the low pressure on the natgas tripped a large red flag...

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