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  1. Hansac

    Liquid service for Pilot Safety Valve

    Can share on experience with using Pilot SV for liquid service (boiler feed water, operating at 200 barg and 160 degC). Set pressure is 250 barg. During start-up, sometimes there are pressure spikes above 95% set pressure, due to operational issue. I'd like to hear similar stories (successful...
  2. Hansac

    Addition of PWHT

    Hi. Scenario: A pressure vessel has four WPS/PQR. Three have PWHT, the 4th WPS/PQR does not have PWHT. All are valid WPS/PQR. After completion of welding, the whole pressure vessel goes into a furnace for heat treatment. Question: Is this an NCR? Does the 4th WPS have to be requalified in...
  3. Hansac

    Use of Nitrogen as Backing Gas

    This original post (thread725-19716) refers. Backing gas is an NEV in ASME IX for GTAW, so changing the backing gas from Argon to Nitrogren does not trigger the requalification of the PQR (but of course, welders cannot change WPS by themselves, WPS can be edited by Welding Engineer without...
  4. Hansac

    Rounded Indications vs Pinhole on Weld Surface

    Is a pinhole considered a "rounded indication"? As per ASME VIII Division 1 Mandatory Appendix 8: "Rounded indications: any relevant indication (it means if its major dimension is greater than 1/16 (1.5 mm) ) shall be considered rejected if it is greater than 3/16 in (5 mm)" As per ASME VIII...
  5. Hansac

    Tube leak detection on Shell & Tube Heat Exchangers

    Has anyone done a tube leak detection on shell and tube heat exchangers? The procedure is like this: 1. Pressurized shell side with pneumatic up to 4 barg, depending on your comfort level in handling pneumatic test. 2. Cover one tubesheet with masking tape, ensuring every tube hole is covered...
  6. Hansac

    SA 516 Gr. 70N vs SA 516 Gr. 80NACT vs SA 516 Gr70 Q&T

    There is an ongoing discussion in my workplace regarding SA 516 Gr. 70N vs SA 516 Gr. 70NACT vs SA 516 Gr70 Q&T Which one is a better heat treatment for SA 516 Gr. 70? The requirement calls for HIC-resistant steel, too. The group specifications mentioned "minimum normalized" condition for SA...
  7. Hansac

    "diamond heated pipe bending"

    Dear all. It is now 2020 and ASME PCC-2 2018 has been published with this paragraph: "307-4.3.2 Cold bending refers to bending below Tcrit. The pipe may be bent cold if permitted by the applicable construction code or post-construction code. Cold bending may require heating below the...
  8. Hansac

    NDT not done before Hydrotest

    For all intents and purpose, I was presenting a hypothetical case. The point is this: which is more supreme. The NDT or the pressure testing? Which act(s) actually certify, validate the integrity of a facility: the NDT or the pressure testing? ASME B31.3 allows "closure weld" procedure for...
  9. Hansac

    NDT not done before Hydrotest

    Allow me to be argumentative. Hydrotesting is done to mimic the severest condition of operation. NDT in 99.99% of the time, does not in itself certify a facility. There is no penalty by the Code if any NDT was not done or not done at all, unlike pressure testing which is compulsory and would...
  10. Hansac

    NDT not done before Hydrotest

    For some reason, NDT was not done or carried out less than stated in ITP for a given equipment/facility. However, equipment/facility was successfully hydrotested, and operated for almost 2 years without any incident. Considering that NDT was not fully completed or not compliant to Code...
  11. Hansac

    Alloy 825 internal surface cracks

    Hi there Ed. Thank you for your reply. 1. Yes it is under B423. 2. As per the mill certificates: a. Cold finished b. Delivery Condition: Annealed Pickled Passivated 3. Testing (all passed): a. UT as per ASTM E213 b. Hydro as per ASTM B829 c. Etching test as per ASTM E381 d. PT for beveled...
  12. Hansac

    Alloy 825 internal surface cracks

    Dear all. We have an Incoloy 825 pipe, just received from the mill with internal surface cracks first detected by visual (plain eyes!) then confirmed with dye penetrant (PT). Questions: 1. From ASTM B423 and then ASTM B829, it seems that these surface cracks would not be able to be detected by...
  13. Hansac

    Verifiying New Measurement Methods Via Statistical Analysis

    You need to do linear or quadratic regression to check the R-square of your test data.
  14. Hansac

    Minitab: Normal Plot of Standardized Effects - Interpretation

    I don't quite understand the plot you shared but test results, by statistics, are "fit" into equations, either linear, quadratic, or more complex equations, to check for predictability. This equation is then drawn through the test data results (or samples). This is called statistical...
  15. Hansac

    Discussion on QW-451.1 in ASME IX

    So a fabricator made a PQR based on these parameters: T = 50 mm GTAW t (root) = 8 mm SMAW t (middle passes) = 21 mm SAW t (subsequent passes plus cap) = 21 mm The PQR above is used to support a WPS with SMAW only and T and t ranges of 8 mm to 200 mm. (The WPS stated backing is required but this...
  16. Hansac

    ASME B31.3: Code Case 19-15 vs 341.3.1(a)

    My confusion is 341.3.1(a) refers specifically to P-Numbers and the 19-15 refers to P1/P2 (sans the "No."). P-No. 2 does not exist, and P1 is Carbon 1/2 Moly, P2 is 1/2 Carbon 1/2 Moly. If 19-15 meant to answer that for P-No. 1 is carbon steel, then there is no conflict. This is one of my pet...
  17. Hansac

    ASME B31.3: Code Case 19-15 vs 341.3.1(a)

    Is Code Case 19-15 in direct conflict with 341.3.1(a)? Interpretation: 19-15 Subject: B31.3-1999 Edition (2001 Addenda), Para. 331.1.1, Heat Treatment Requirements and Para. 341.3.1, General Date Issued: July 1, 2002 File: B31-02-03070 Question (2): In accordance with ASME B31.3-1999 Edition...
  18. Hansac

    Repair of Double Deck Pontoon on EFR Tank

    Dear all. API 653 Section 9, and paragraphs 9.12.1 & 9.12.3 are hereby referred. Case: We have a double deck EFR that is currently leaking. Tank is empty, and floating test of the roof showed more than half of the pontoon segments. My question is, can non-metally repair of the leaking roof be...
  19. Hansac

    ASME IX QW-423 & QW-424

    DekDee, indeed your question is valid. As for me asking a "basic" question, I am just perplexed as to why the industry doesn't wish to follow this leeway provided by the Code (F number notwithstanding). The Code treats carbon and stainless steel welders as the same (again, F-no...
  20. Hansac

    Is the WPS worthy?

    The original poster is having the same issue with me, except that both I and the other party in my case have access to ASME IX but we differ in the understanding of QW-423 I realized now the problem is this, quite a number, if not most, of so-called "welding engineer" or "welding specialist" or...

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