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  • Users: Oscarvs
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  1. Oscarvs

    About NDT perssonel & procedures

    Dear Sirs, I work for a company that produces tanks, vessels, structures, etc. Our client have contracted a third companie for the Quality Control of theirs products.The supervisor say that all NDT procedures (VT, PT, RT or UT) must be signed by a Level III Inspector, he say that it is a...
  2. Oscarvs

    Butt-welded bottom joints

    In API-650 11th Ed, paragraph 5.1.5.5 says: Three-plate joints in the tank bottom shall be at least 300 mm from each other and from the tank shell. Do I understand that distance is referred to the inside of tank shell? I have this case: distribution of plates for butt-welded tank bottom (shop...
  3. Oscarvs

    Ceramic backing for Duplex Stainless Steel

    Sirs, Please if somebody could send me information or comments about the advantages or disadvantages of use the ceramic backing for welding on duplex stainless steel (ASTM A240 type 2304). We construct storage tanks for mining industry and the weld for both sides are possible, but we thinking...
  4. Oscarvs

    Flanges for Heat Exchanger

    I have a problem to specify the appropiate material of flanges of a heat exchanger, this is a old equipment and only a section required replace, this section will be formed by a rolled plate (ASTM A-516 Gr 70) with a flange in each end. The original drawings of equipment are not available, only...
  5. Oscarvs

    ASTM A1011 vs ASTM A36

    We are working a project for structural application, we required ASTM A36 plates of 3 mm thickness, one supplier offered ASTM A1011 Type 1 Grade 36, they indicate that ASTM A36 is for plates of 5 mm and over, and A1011 is applicable for 6 mm and under, and that 3 mm thickness is considered...
  6. Oscarvs

    API 650 - Reinforcement plate for nozzles / manholes

    Does API 650 require that the material used for the tank shell is of the same that the material used for manhole / nozzles reinforcement plates?

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