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  1. mariocalvo

    PQR Qualification

    Thanks for yours responses. Dear stanweld, at this part it is not requiered impact test. Dear DVWE, there is only one PQR, with two PWHT cycles, one for 1 hour and 30 min. and then another PWHT of 6 hours for the same coupon.
  2. mariocalvo

    PQR Qualification

    Dear all, I have a question about a qualification of a PQR. The thickness of the coupon is 48 mm, material is P No3. Our supplier had PWHTed at 610ºC for 1 hour and 30 min instead of 1 hour and 55 min (required for that thickness as per ASME VIII)a second cycle plus 6 hours. The mechanical test...
  3. mariocalvo

    Qualification of dissimilar base metal welding

    Thanks for your repair, Stanweld: Filler metal for GTAW is ER70S-6 SFA 5.18 number A 1. Metengr: The secuence is as you posted, but on the PQR a final pass was done with SMAW filler metal E7018-A1. The question is that this final pass will not be carried out in producction, and i´m not...
  4. mariocalvo

    Qualification of dissimilar base metal welding

    Dear all, I have a dissimilar welding between P5A and P1. To carried out this joint, a buttering will be used. Our supplier has sent to us a PQR with the following steps: 1-P5A is buttered with E7018-A1 (up to 7mm after machining) and PWHT at 710ºC. 2-Weld the buttering to the P1 and PWHT at...
  5. mariocalvo

    Different coating for buried pipes

    Thanks for this important information
  6. mariocalvo

    Different coating for buried pipes

    Dear all, We have a flange which shall be coated with polypropylene coating system in a piping buried system. Our supplier offer us to coat with polyurethane (800 microns). I would like to know if this is acceptable. Thanks in advance
  7. mariocalvo

    Material Selection for storage Sodium Methylate

    Moltemetal, Thanks for your replay. I think the sodium methoxide is pure, and has not sodium chloride, but i do not know if the methanol would have some water.
  8. mariocalvo

    Material Selection for storage Sodium Methylate

    Hello, I´m new in this tips, so i hope someone can help me. I would like to know whether carbon steel can be suitable to store sodium methylate in solution of methanol at ambient temperature, or it is necessary to use SS. Thanks in advance.
  9. mariocalvo

    Sodium Methylate

    Hello I would like to know if carbon steel is suitable for storage sodium methylate at ambient temperature. Thanks in advance.

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