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  1. Peter113

    CS overlayed with Titanium?

    thanks for your support, herebelow you have the requested information: MOC Shell side: CS Tube side: CS + Ti clad. Tubesheet: CS + Ti clad (on tubeside) Tubes: Ti TEMA type: There are different designs (AEL, AJL, NEN, BJS, BEM, BJM, BES and HES. Strength weld joint on tube side. Tube...
  2. Peter113

    CS overlayed with Titanium?

    Hi, we have several heat exchangers with CS + Ti cladding on tubeside selected because the service is sea water (máximum operating temperature: 47ºC). The tube and the tubesheet shall be Ti and CS + Ti cladding (tubeside) respectively with a strength weld joint. My question is: 1) Any...
  3. Peter113

    Naphthenic Acid corrosion in Duplex SS

    hI, for a pump operating wiht naphthenic acid content > 2% (atmospheric residue pump) and 339ºC, the proposed material for shaft is Duplex SS (UNS 32205). I know the resistante for such organic acids depends on the alloy content. For high naphthenic acid content-high turbulence and high...
  4. Peter113

    Channel overlayed Tp 317L PWHT

    Hi, we are fabricating a heat exchanger in CS + SSTp 317L weld overlay due to nafthenic acid corrosion. Our design has more than six passes and according to API 660, carbon steel channels request PWHT in order to reduce residual stresses by welding. But also in API 660 para.6.6.5 says textually...
  5. Peter113

    Channel side overlayed with API 660 PWHT

    Hi, we are fabricating a heat exchanger in CS + SSTp 317L weld overlay due to nafthenic acid corrosion. Our design has more than six passes and according to API 660, carbon steel channels request PWHT in order to reduce residual stresses by welding. But also in API 660 para.6.6.5 says textually...
  6. Peter113

    SA 179 Silicium Content

    Hi, for a SA 179 material, our Client has requested a minimum content of Silicium of 0.15%. According with the mentioned specification, no Silicium is reported as mandatory but our doubt is due to the paragraph 8.2 which states "suppliying an alloy grade that specifically requires the addition...
  7. Peter113

    Fine Grained SA 106 GrB/SA 105

    Hi, for a normalized SA 106 GrB and SA 105, is it supposed to be a fine grained material as well? Thanks Peter
  8. Peter113

    Bolt material SA 193 B7M/ Nut material SA 194 Gr L7

    No coating is used. The plant is near the coast. Thank you
  9. Peter113

    Bolt material SA 193 B7M/ Nut material SA 194 Gr L7

    Hi, the bolts material specified for assembly of WET SOUR process piping (non exposed to fluid) was SA 193 B7M. Due to a mistake in our material take-off software, SA 194 Gr L7 was specified for nuts instead of SA 194 Gr 2HM (22HRC). This material is qualified under a hardness (24-38 HRC)...
  10. Peter113

    API 660 Short time tensile strength

    Dear All, what is the meaning of short time tensile strength? This statement is indicated on mentioned Standard para. 7.8.9: "Allowable stresses that have been established on the basis of short-time tensile strength shall not be used for the design of girth flanges, gasketed tubesheets and...
  11. Peter113

    Side Bend test acc. to ASME IX

    Hello to all, i would like to know why it is required side bend tests when the base metal thickness used on qualification is over 19 mm instead of Root&Bend tests. Which is the purpose? Thanks for your supports. Peter
  12. Peter113

    Titanium tubesheet Clad of Solid?

    Maybe i misexplained my query. Currently, we are defining the MOC since this equipment is to be build. The equipment is a overhead condenser atmospheric column, therefore, condended water is expected to happen with HCl dissolved due to the combination downstream of temperature and dissolved...
  13. Peter113

    Titanium tubesheet Clad of Solid?

    Thanks for your collaboration, i can give you more information. The corrosive fluid (vapours from atmospheric distillation column) goes through shell side. The tube side fluid is Storaged crude. I would like to have the following from you: 1. Solid or clad (only shell side) tubesheet. 2. Would...
  14. Peter113

    Titanium tubesheet Clad of Solid?

    Hello to all, i have a H&E with titanium tube SB-338 Grade 2. Providing that the type is BES, is it possible to use a clad titanium tubesheet (shell side) or it must be solid? What about baffles? Thanks Peter
  15. Peter113

    Software CO2/H2S gas wells corrosion rate prediction

    Hello to all, would you recommend me a software related material selection for line pipe on sweet and sour service? regards Peter
  16. Peter113

    Tube bundle layout different from drilling tubesheet layout

    Thanks, no removal of baffle is possible due to thermal considerations. No metallurgical concerns exist. Regarding the physical NDE, do you know any recognized Standard to be follow in order to verify the integrity of the tubes? Do you think necessary to perform a hydraulic test on the tube...
  17. Peter113

    Cold-Reforming of UNS 39274 (duplex) Tubes

    Hello to all, we have a multitube heat exchanger (minimum center to center diameter: 14") with tube bundle according to UNS 39274 (superduplex) cold formed and solution annealing(U-bends and 12"). The tubesheet layout is square pitch (1") and the U-Bends have been formed according to triangular...
  18. Peter113

    Tube bundle layout different from drilling tubesheet layout

    Thanks SnTMan, all thermal concerns have been considered. We are looking this issue from a metallurgical and mechanical point of view. We can give you for your information some details: - Maximum radial displacement: 1.5" (opening and closing the bend). - Total length oh tube bundle: 240" -...
  19. Peter113

    Tube bundle layout different from drilling tubesheet layout

    Hello to all, we have a multitube heat exchanger (minimum center to center diameter: 14") with tube bundle according to UNS 39274 (superduplex) cold formed and solution annealing(U-bends and 12"). The tubesheet layout is square pitch (1") and the U-Bends have been formed according to triangular...

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