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  • Users: CWEng
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  1. CWEng

    SCC in molten salt

    Carbon steel seems to be an acceptable material for molten nitrate salt piping <750F (Sandia labs solar power Design basis document). However, a cracked weld in a small bore pipe was sent to a lab who evaluated it as SCC (and I would agreed from the analysis provided). What conditions might...
  2. CWEng

    Section IX QW-193/288 mock-up qualification

    We make a product that looks like a heat exchanger, but isn't. A customer is requiring us to do tube-to-tubesheet mock-ups, which have been problematic for us even though we don't make tubes or tubesheets. The product we make has tubes from .028" to .042" thick, but they are filled with an...
  3. CWEng

    NACE hardness testing specifications

    Do NACE MR0175 and MR0103 call out the correct hardness testing standards? NACE MR0175-2015 says to use ASTM E384, and NACE MR0103 says ASTM E92 has been replaced by ASTM E384. Yet both ASTM E92-17 and ASTM E384-17 appear to be active. ASTM E384 is only for microhardness up to 1000g, and E92...
  4. CWEng

    Circle (nozzle) welder

    Anybody out there using Cypress/Bug-o circle welders for nozzle welding and have any input as to their reliability, usability, setup, performance, etc? I haven't seen one used in a long time, but we have an upcoming job where they seem like they could be useful, and just thought I'd see if...
  5. CWEng

    Grade 11 hardness after welding/PWHT

    We have a new ASME Section VIII job on 1.25CR-.5Mo material where the hardness requirement (weld/HAZ/base metal) is 225 HV10, which is not out of the ordinary for Grade 11 material (at least for B31 pipe with a higher PWHT temperature). However, it is a lower hardness requirement than previous...
  6. CWEng

    Grayloc sealing surface

    Is there any way to rework or remachine the sealing surface of a damaged grayloc fitting (there is a ding on the inside corner), or is the only way to fix it to cut off and weld on a new one?
  7. CWEng

    Brazer performance testing

    For brazer performance, Section IX QB-302.1 requires testing of the braze coupon in accordance with QB-452. The right hand column of Table QB-452.1 requires 2 "Peel or Section" specimens. Previous practice at a manufacturer's plant has been to always perform section tests. However, Note 1 of...
  8. CWEng

    Production impact test plates -VIII UG-84(i)

    I have come across some design engineers in some recent work that know relatively little about impact testing (unless PV Elite tells them so- and most of my experience is outside ASME VIII). But as I read UG-84, it seems that any time the base metal is not exempt from impact testing, that...

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