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  • Users: GabrieleB
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  1. GabrieleB

    AISI 316 CLADD OVERLAY REPAIR

    Our valve supplier raised an NCR to avoid to replace a welding overlay on carbon steel LF2 material made with one pass of AISI 309 and second pass of AISI 316 (3 mm of cladding). The welding process shows a big porosity (out of acceptance criteria), there are in the cladded surfaces many point...
  2. GabrieleB

    WELDING OF CR-MO STEEL P9 GRADE WITHOUT PWHT - USING 625 INCONEL FILLER METAL

    A supplier of Heat exchanger made in SA 387 Grade 9 steel to avoid the PWHT is going to use a filler metal ERNiCr-3 (alloy 625). The welding process is made with 4 passes of GTAW (thickness qualified 9mm). It is sufficient this process to avoid the PWHT that is usually mandatory required for...
  3. GabrieleB

    F22 Modified Vs X60 (SSC issues)

    Can anyone explain me why in high H2S content conditions the use of F22 Modified materials is preferred to the X60. I want to clarify that the F22 Modified has SMYS=60 Ksi (identical to X60). The justification I fuond is: "Initial problems discovered very early on were related to the X60 piping...
  4. GabrieleB

    Epoxy - Urethane Coating (SP-2888) compatibility with 3LPE substrate

    I have to verify the feasibility of application of a Epoxy - Urethane Coating (SP-2888) coating on a substrate of 3LPe (3-layer polyethilene. Being the first (SP-2888) a thermosetting resin and the substrate a thermoplastic resin, which kind of reccomendation shall I take into account to...
  5. GabrieleB

    ISO 3183 LINE PIPE - L450ME

    I have to purchase a line pipe with a material grade L450 ME. I suppose that "M" stay for thermomeccanically rolled condition. But the ulterior suffix "E" for what is?
  6. GabrieleB

    SOUR CRUDE OIL

    I'm working on a 16" carbon steel pipeline that transfer crud oil at 90°C. This Crude Oil has the following characteristics: Specific gravity at 35°C = 0.95 Sulphur content = 3,5% Viscosity = 220 Cst Water sediment = 1% I read a lot of articles that indicate 1% as a limit for sulphur on crude...
  7. GabrieleB

    AISI 316 FOR DOWNHOLE CASING MATERIAL

    I'm working for a Client that is going to install AISI 316 for a downhole casing material (on a production well). The general condition is: Temperature 55°C P H2S 50 Kpa 150.000 mg/l of chlorides PH<4 Looking on ISO 15156-3 Table A.2 (applicable for any equipment or components) seems to be...
  8. GabrieleB

    H2S CONTENT IN THE WATER AND H2S DISSOLVED IN THE GAS

    I'm working on a material selection study where I have to study a water with a content of 500ppm of H2S dissolved. Since I'm working with ECE software (De Waard and Milliams Model) that use the ppm dissolved in the gas phase. Is it possible to find a correlation beetween the H2S dissolved in the...
  9. GabrieleB

    ASME B 31.4 D/T RATIO VERIFICATION

    The verification imposed by ASME B 31.4 on the D/t ratio (Section 403.2.5) shall be carried out on the selected wall thickness (the commercial one) or in the selected wall tickness removing the Corrosion Allowance? I suppose that being defined for installation purposes, the wall thickness to be...
  10. GabrieleB

    ASTM A 672 SAW

    The ASTM A 672 is applicable for ERW pipe. Is it possible to purchase a SAW version of this pipe. Seems to be that some supplier are able to do it. Is that in contradiction with the ASTM standard that in principle is valid only for ERW? Let me know your experience about. Thanks in advance
  11. GabrieleB

    SAW vs ERW pipe

    I have to specify a material equivalent to the ASTM A672 C70 but produced in SAW rather than ERW. Which ASTM can I use? Moreover wich is the thickness limit for the ERW process? Is it possible to use ERW for thickness above 30mm. Thanks
  12. GabrieleB

    ASTM A 350 LF2 forging equivalent

    I have to specify a material for piping valves to be used for low temperature service up to -40° according to EN standard. The process piping design code EN 13480-2 does not give indication for a forging material for temperature up to -40°C, but traditional carbon steel material are applicable...
  13. GabrieleB

    Sulphide Reduction Bacteria (SRB) dangerous concentration

    Does someone know wich is the dangerous concentration for the SRB bacteria in the water? I have water with concentration of 10^3-10^6 bact/ml. Is that concentration dangerous? Do I need a specific Biocide injection to be safe? Which kind of product is advisable for a inhibition program? Thanks...
  14. GabrieleB

    ppm H2S IN WATER

    I have a produced water with 12 ppm of dissolved H2S. I have non idea of the partial pressure at the equilibrium condition (Required by ISO 15156). Considering this uncertainties, has anyones indicative values of H2S ppm dissolved in the water to be sure that Sour Servive Condition will not...
  15. GabrieleB

    DUPLEX COLD BENDING

    Have anyone had experience with Duplex Cold Bending. I'm working on a pipeline engineering with duplex pipe (S31803) 6"/4" thick. 4.8mm.I have to specify a limit angle for the cold bending on site. Some people has experience with 15°, someone else with 30°. There is also Company like SHELL that...
  16. GabrieleB

    LINING OR CLADDDING

    I have to specify internal surface protection for a carbon steel filter. The filter is working on a very high pressure (180 barg) and 80 °C temperature and is working with injection water an high percentage of chlorides. To protect the internal surface I would suggest to use a cladding material...
  17. GabrieleB

    ISOLATING JOINT ADDITIONAL PROTECTION

    Have you ever seen addtional protection on isolating joint that protect the hub section from sparkling or current leakage? In a specification used for Isolating Joint there is the following statement: "An external plastic sheath shall be applied over the external paint coating in the area of...
  18. GabrieleB

    EN 14616 / ISO 13623 identical?

    Can anyone confirm me that the last version of EN 14616 and ISO 13623 are identical? In the 2003 they were. I have verified also that ISO 13623 last version is pratically the same of 2003 version so I can suppose tha also the EN 14161 has not been modified.
  19. GabrieleB

    INTERNAL COATING ON VESSEL AT 90 Barg??

    Client ask me to use an internal coating in a separator at a pressure of 90barg and 50°C temperature. I have proposed SS Cladding. Oneslty seems to be a strange requirement. Does Anyone know wheter it is technically possible to use internal coating at this design condition? Thanks
  20. GabrieleB

    PIPE ROUGHNESS API 5L

    I have to make some calculation on pressure drops along a pipeline. Reference standard is API 5L. What roughness I have to use? Is it correct to use 45micron. I' haven't seen any maximum roughness specification in the API standard. Can anyone help me on finding a reasonable roughness value to...

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