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  1. EdStainless

    results of tests as per SA-480

    I have seen cases where there is a test (maybe a bend test) that always passes and they simply don't want to do it each time. So they say that it is 'capable' of passing. In the case of ASME I have always taken results to mean just that. If it is a measurement I want the numbers, if it is a...
  2. EdStainless

    Checking inclusion content of weld filler material

    We would buy from local distributors, but the wire had to have been made by one of our approved vendors. Even if it meant paying 10x for the wire it is much less expensive than test, grind out, re-weld, and re-test.
  3. EdStainless

    Plate marking as per SA-480

    Did your PO say 'per SA-480' ? If not then don't expect it. If you didn't list a specification they are free to supply whatever they like.
  4. EdStainless

    results of tests as per SA-480

    If it is a test that is pass/fail then that is OK. Otherwise I expect numbers. And 'capable' is never acceptable. Of course considering the source they are likely to just give you values from some tests that may not be for the lot of material in question at all.
  5. EdStainless

    Checking inclusion content of weld filler material

    So are you buying tons of filler at once? How tight is your QVL? Sound more like an audit and inspect situation than requiring special testing. We only bought weld wire made by two suppliers. Period.
  6. EdStainless

    Plate marking as per SA-480

    This is from an older version of A480
  7. EdStainless

    Corrosion on cable trays.

    So why do you care about the bolts rusting? Have any failed? You buy double galvanized (not twice, just double weight) or fluoropolymer coated fasters if you want less rusting. Fasteners are notorious for this because installing them often damages the Zn. Unless you remove the bond wire you...
  8. EdStainless

    Stainless Steel 300 series

    In the handbooks you will find about 150 austenitic SS alloys listed. Commercially there are 20-25 in use. Some of these alloys come in various C levels such as 304L and 304H. In the US and EU no one makes straight 304. The low C is better for weldability the high C version has higher strength...
  9. EdStainless

    Welding of duplex SS pipe 30 "

    I presume that you are talking about 2205? And you will use the 2209 filler? What welding method(s)? Pure Ar for shield gasses? If you get too hot you will form intermetallic compounds in the weld metal and/or HAZ. This will lower the mechanical toughness and significantly lower corrosion...
  10. EdStainless

    Galvanic corrosion for material choice

    I presume that your process side will always be dry, is this correct? So we are talking about external corrosion. Are all of the CS to SS joints horizontal? Allowing things to drain (no puddling) helps a lot. The SS is likely to cause some localized accelerated corrosion of the CS in areas...
  11. EdStainless

    Very High Temperature Piping Stresses

    Yes, 253. You have to go through the creep calculations to see which would be the best option.
  12. EdStainless

    Very High Temperature Piping Stresses

    In the realm of superalloys the newer ones are often casting grades intended to be directionally solidified or single crystal. Alloys like "X", 256MA, and 330 are about the limit.
  13. EdStainless

    Process Chill Water Loop for Multiple Machines with varying requirement.

    When you increase the size of your supply and return lines (to minimize pressure drop in them) your chiller may become the choke point. How much cooling do you need? How much flow do you need to do that? Can you get buy without having all of you flow return through the chiller? We did something...
  14. EdStainless

    Pump modifications

    Buy a new pump designed to work in your new conditions. Modifying an existing pump will only get you a few percent of change. If you can't meet the submergance requirement then you will need a special pump. It will likely have the first couple of stages designed for low intake head.
  15. EdStainless

    How to protect against frequent breakdown of soft starters at a water pumping station?

    Waross is on the money here. A transformer on the output of the VFD and downhole will be fine. We used to deploy these 14,000' deep (yes it takes on hell of a cable). Soft starters with phase loss and low voltage protection were never inexpensive. Only the ones with no protection were.
  16. EdStainless

    Thread embedment required for bolt in tension

    Or the nut enlarges enough to allow the thread engagement to become small enough to fail. We used to test high strength bolts (>180ksi UTS). Our test fixture was about double the OD size of a heavy nut, and it was made of tool steel. We could develop 2d engagement, but out standard was to test...
  17. EdStainless

    Flow inconsistence

    But do you have pump and system curves that are also corrected for SG and viscosity? The question is why is pump 1 only delivering 1.8? Low inlet pressure? Too much pressure drop in the system? Worn pump?
  18. EdStainless

    Titanium-Stainless Steel Galvanic corrosion

    Likely enough corrosion products that it is truly mechanically jammed. Good luck.
  19. EdStainless

    Flow inconsistence

    I take that all of your flows and heads have been corrected for SG and viscosity. I agree with HT, you are either not getting 1.8 out of 101 or the measured flow is wrong.
  20. EdStainless

    stress reliving on 3mm 625 plate butt weld during PQR qualification for utilising in cladded vessel

    Typically you explosive bond, then you SR the steel (not the alloy), and then you fabricate. Usually with Ni alloy overlay the SR temp for steel will not stress relieve the alloy. If they did the weld and extracted a coupon of the 625 for testing the SR of the steel is irrelevant. So you have a...

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