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Recent content by svi

  1. svi

    double walled tank API 650 qualification

    IFRs: “I don't think NFPA limits the spacing between dike walls but I don't remember what they say about this situation regarding tank to tank spacing” NFPA provides the minimum inter-tank spacing of the regular tank. Wall to to wall spacing so as to minimize radiation effect to an adjacent...
  2. svi

    double walled tank API 650 qualification

    IFRs: I coined the word double wall, since there wasn’t any. Double wall, if the inner one leaks the second wall becomes the tank shell. The annular floating roof, that must be for liquid filling on both sides. Will that be double wall? will you have a shot. This one must be from a drone?
  3. svi

    double walled tank API 650 qualification

    Thank you all for the responses. IFRs: Good picture and post. Curious to know about the floating roof for the annulus. This is the same that I wanted to say that these configurations are in use around the world. Is it not time for API 650 to acknowledge to include. Agree that secondary...
  4. svi

    double walled tank API 650 qualification

    I understand that when there is a space constraint for having a conventional bund secondary containment, a double shell is seen used. My question is whether this is qualified by API 650.
  5. svi

    double walled tank API 650 qualification

    thread809-204059 Why is it that there is no reference of a double-wall arrangement in the API STD, even as a reference, committee interpretations so far? Will it not need a qualification for a double-walled arrangement wherein say an 80 m steel tank is enclosed by another steel tank offset...
  6. svi

    SOUR Service chemical composition restriction and NACE ISO 15156-2 Option 1 selection

    Company needs an industry aligned specification. Supplementary requirements makes non standard material specifications and has to be a mill order. On smaller projects especially for modifications or revamps this becomes difficult. HIC testing to the requirements per NACE are industry standard...
  7. svi

    SOUR Service chemical composition restriction and NACE ISO 15156-2 Option 1 selection

    Does through thickness property value steel have an advantage on HIC resistance? Another requirement not identified in NACE.
  8. svi

    SOUR Service chemical composition restriction and NACE ISO 15156-2 Option 1 selection

    The spec does not say the reasoning but a consultant states it for enhanced HIC resistance. NACE does not require this, neither for option 2. This cannot be applied for off the shelf components which uses standard specification grade and is NACE compliant to the ISO 15156-2. If this provides...
  9. svi

    SOUR Service chemical composition restriction and NACE ISO 15156-2 Option 1 selection

    Many Company Spec includes a restriction on the chemical composition of the steel. A typical one is like this C 0.2 wt %, Mn 1.3, P 0.01, S 0.002, Si 0.4, Cu 0.4, Ni 0.4, Cr 0.3, Mo 0.12, V 0.015, Ni 0.015, Ti 0.02, B 0.0005 A Carbon equivalence CE = C + Mn/6 + (Ni+Cu)/15 + (Cr+Mo+V)/5, limited...
  10. svi

    API 6A RTJ 6B Groove with CRA overlay - Spectacle blind

    Thanks gr2. I note from ASME SA 265 which is a material standard, It says about overlay specimens are to be tested and what is an acceptable test result. "(4) The tensile properties thus determined shall not be less than the minimum and not more than 5000 psi (35 MPa) over the maximum...
  11. svi

    Triple off-set butterfly valve sealing in reverse direction

    The API 609 2016 now provides more detail of the triple offset design, by way of cross sectional details. It is grouped as earlier under the category B type. It requires to be specified by the user, if the bi-directional attribute is required. It is not implicit in terms such as 'high...
  12. svi

    Triple off-set butterfly valve sealing in reverse direction

    Manufactures claim on literature that the triple off-set butterfly valves are sealing in both directions. But from experience it is known that the valve does not hold effectively against the normal flow direction. The valve standard API 609 does not address whether there is an inherent design...
  13. svi

    ASME B16.48 Spectacle blind - Thickness for RF vs RTJ

    This post was earlier made under ANSI (standards) code issues. I have flagged the entry for removal from there. I am looking at a 4" class 1500 ASME B16.48 thickness dimensions for a RF and RTJ. RF : 22 mm, is the thickness excluding the facing Female RTJ : 48 mm RTJ groove depth : 8 mm...
  14. svi

    API 6A RTJ 6B Groove with CRA overlay - Spectacle blind

    thread794-422928 API 6A gives in Table 52 the rough machining detail. The depth to which material may be removed is 8 mm for a R39 4 1/16" class 5000 groove. This is the same as the raised face available on the flange. I have a CS spectacle blind that needs to be overlayed with Inconel 625...
  15. svi

    ASTM A519 Gr 4130 mill test

    thread177-351078 The ASTM spec for low alloy tubing does not specify a mill hydro test. It is neither there in the recommended supplementary tests. A106 and A213 specs do call for mill hydro tests. What is the reasoning why the A519 excludes the mill test.
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