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  1. Salmet

    Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750 Pipes

    Thank you EdStainless, For the project I mentioned above, A923 was not part of qualification. Process team haven't yet done the inside inspection or cleaning. So, in a situation where most of the welds are inaccessible from inside, would proper pickling/passivation by conventional HF+HNO3...
  2. Salmet

    Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750 Pipes

    Thank you Edstainless and Sjones for your kind responses. Earlier we did a lot of super duplex piping without internal pickling and passivation for untreated sea water application @ 65 bars operating pressure at maximum 55 oC operating temperature. Since almost 3 years we did not had any...
  3. Salmet

    Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750

    Dear Members, In one of our desalination plant projects we are being advised to perform Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750 pipe welding joints, for untreated sea water application. Is it really required internally? I will be thankful for your kind...
  4. Salmet

    Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750 Pipes

    Dear Members, In one of our desalination plant projects we are being advised to perform Internal Pickling and Passivation of Super duplex stainless steel SA 790 UNS 32750 pipe welding joints, for untreated sea water application. Is it really required internally? I will be thankful for your kind...
  5. Salmet

    VICTAULIC COUPLINGS FOR SUPER DUPLEX PIPING SYSTEMS AT 65 BARS

    Dear Members, I am being asked to install Victaulic coupling joints at 6inches diameter super duplex stainless steel piping system for untreated sea water, in a Reverse Osmosis water treatment plant, operating at 65 BARS (943 Psi). Grooves are supposed to be machined on the piping components...
  6. Salmet

    QUALIFIED DISSIMILAR THICKNESS FOR Flat Olet to Blind Flange JOINT

    Dear Members, I have to weld an Flat Olet Class 3000, 1" diameter with a blind flange (Thickness at bevel toe = 11mm) with a blind flange having thickness 30.2mm, via GTAW via attached configuration pattern. My welding procedure is qualified to weld upto 12mm thickness. Does ASME IX allow us to...
  7. Salmet

    Corrosion in Duplex stainless steel pipes

    Thank you very much Edstainless, weldstan and Magben, for your valuable suggestions. EdStainless, if you can please refer me some literature or link regarding your point no.3, I will be extremely thankful.
  8. Salmet

    Corrosion in Duplex stainless steel pipes

    Thanks Ed and SJones, The color of welds were normal, as were welded under strict supervision, Root passes were visually inspected by qualified inspectors. The ambient temperature at service is between 30 to 40 degrees celcius. Usually, weldments, if done properly, have superior metallurgical...
  9. Salmet

    Corrosion in Duplex stainless steel pipes

    Thanks Ed and WeldStan, 1) We were asked to weld install S2205 Lines i.e. Materials selection was at clients end. 2) ASTM A923 was not considered a part of procedure qualification, but Ferrite Number Analysis was. The PQR test coupon and weldments had delta ferrite number within limits. 3) Most...
  10. Salmet

    Corrosion in Duplex stainless steel pipes

    Thanks Ed Stan. I am sharing here a video of a corroded Flange joint adjacent to pump. I would request your expert opinion on it. https://drive.google.com/file/d/1iIukuxi1Yj9k54Ziy4qSKjIB0dnM40Fi/view?usp=drivesdk Other radiograps are showing uniform distribution of corrosion pits on and...
  11. Salmet

    Corrosion in Duplex stainless steel pipes

    Dear Members, After 3 months of Untreated sea water service at ambient temperature, 65 Bar pressure, Radiographic testing of welded duplex stainless stainless UNS S32205 with ER2209 TIG filler wires, severe corrosion pits have been observed. Please refer to attached snaps of RT films. Please...
  12. Salmet

    CHEMICAL CLEANING AND FLUSHING OF PIPING SYSTEMS

    DEAR MEMBERS, One of our vendors for chemical cleaning of carbon steel piping systems (conforming to ASME B31.1), is proposing citric acid solution for this purpose. I will be thankful if any one can refer me an MS excel calculation sheet/calculations in order to confirm the efficient pressure...
  13. Salmet

    Heat Treatment of SS 420

    Thank you very much Edstainless and metengr for your kind help.
  14. Salmet

    Heat Treatment of SS 420

    Dear Members, please suggest suitable heat treatment of stainless steel 420 grade we have been quenching and tempering it to achieve UTS in excess of 1300 Mom and need % elongation of 8... Results are never stable wrt to elongation while we consistently achieve its required hardness. Thanks in...
  15. Salmet

    Selection of suitable Material for sour service at low temperatures

    Dear Members, please suggest if some body has experienced the case for selection of suitable material with working temperature at minus 90 degree C for the transportation of a mixture of around 4 % H2S and 3.4 % CO2 gas. Thanks in advance
  16. Salmet

    SEISMIC LOADING IN STAAD PRO

    Dear Members, I need guidance to apply seismic load over an industrial truss in accordance with IBC 2006. Thanks in advance
  17. Salmet

    Welders Qualification Testing With Purging (ASME IX)

    Metengr, Thanks a lot for your kind input as usual. Can you please guide me how to submit a request the ASME IX commitee for any querry?
  18. Salmet

    Welders Qualification Testing With Purging (ASME IX)

    Metengr, If a joint is backed up by a backing strip or double welded, mostly it is not purged and even if purged, the parameters does not remain the same as in case of joint to be welded with gas backing from one side only. The query is still there, in other words: Why a welder qualified to...
  19. Salmet

    Welders Qualification Testing With Purging (ASME IX)

    Dear members, Why is a welder qualified with purging of inert gas, not allowed to weld without purging according to ASME IX QW-356 and QW 408.8? Despite practically, it is more difficult to weld with purging of inert gas than welding without purging. Thanks in advance.
  20. Salmet

    Hot and Cold working temperatures in ASME codes

    What range of temperatures does ASME VIII Div. 1 or ASME I mean when it uses hot working and cold working terms? Does it refer to the metallurgical definitions of cold and hot working?

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