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  • Users: Erick21
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  1. Erick21

    Cryogenic piping design

    Dear All, I'm looking for some information on how to design a suction piping for two centrifugal pumps connected to a common header and a suction tank. When both pumps run together, both run fine. As soon as you stop one pump, the second pump starts to have some problems after sone minutes and...
  2. Erick21

    Duplex Casting with unassigned P-number

    Hi, We're using a PQR qualified with seamless pipe in duplex (S31803) : P10h-P10H. Our customer doesn't agree that we use this PQR to weld a pipe of duplex to a casting of the same grade (ASTM A890 gr 4A). The reason is that duplex casting has no P-number, so it should be separately qualified...
  3. Erick21

    Weld Hardness / NACE MR0103 & MR0175

    Hello, NACE MR 0175 states that hardness must be check on the PQR for carbon steel welding and should not exceed 22 HRC without PWHT. NACE MR 0103 states both value 22 HRC and 200HB and refers also to NACE RP 472 wich not define clearly a precise value. How to be sure on which value we have to...

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