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  1. mariolucas75

    Welding of duplex SS pipe 30 "

    Please help me on advise What critical factors / variables to be considered while welding duplex SS pipes, the environment is marine and there is no fully equipped welding shop... As a quick research it was advised - "heat input and interpass temperature must be controlled during welding"...
  2. mariolucas75

    Tangential Radiography of 16" pipe

    What are pros and cons using Selenium for tangential radiography of NPS 16 " pipes typical thickness 9-12 mm range to find an internal or external corrosion () ? Since selenium has a lower penetration ability ~ 25mm and the beam may travel along the chord inside the thickness which may have a...
  3. mariolucas75

    Risk of through hole on live piping

    Dear All, If a live piping is having localized external corrosion that may be consuming the most thickness of the wall and the line cannot be isolated what would you advise? Clamp could not be installed due to irregular profile. Thank you very much
  4. mariolucas75

    thickness tolerance of piping Vs plates

    Dear All, I have a following question: The seamless pipe thickness tolerance form mill production is 12.5% The under tolerance of welded piping is 0.01". Could you tell me please if there are such tolerances for plates - plates that are rolled within manufacturer factory. I want a plate with...
  5. mariolucas75

    Piping insulation lagging and PEC scan

    Dear forum, Could you please advise me with the following: Piping is insulated and covered with lagging (metallic lagging)... as shown on the picture.... What materials normally is that ? Is it galvanized SS sheets ? Might it be some other metallic material ? And what is thickness of it...
  6. mariolucas75

    Rad NDT exposure time

    Dear Forum, Please help me to find an explicit formula to calculate the time for RT exposure (NDT of piping). I want to build that formula in excel. There is a tool for example "RT toolkit" for android, however i want an explicit formula and table of parameters that go in that formula -...
  7. mariolucas75

    Welding detail confused

    Dear Forum, What does the welding detail mean in attached file ? Weld on arrow side ? But what are circle and arch like markings adjacent to "V" ? And what weld joint efficiency it would need E=0.9 from ASME VIII Div 1 - Table UW 12 ?
  8. mariolucas75

    off spec piping

    Dear forum, There is a vessel constructed to an ASMVE VII div 1 code (At least as datasheet says). Vessel nozzle spec says: 4", wall thickness 1.305" But, in schedule table there is no 4" pipe having thickness 1.305". Maximum thickness for 4" pipe is 0.674" = 17.12mm (XXS). Having done...
  9. mariolucas75

    Flange magnetic properties outside vs inside

    Dear forum, I have I noticed a following - a flange face and flange interior have different magnetic properties rather than its outside surface.... The magnet sticks strongly to a flange from outside and very weakly to a flange face .... Vessel Nozzle neck has the same behavior - from outside...
  10. mariolucas75

    Flange face coating

    Dear Forum, Your advise is needed.... in what cases the flange faces are coated ? I have a spec where 20 mills coating thickness is specified on sealing face of a flange (RF flange ).... 20 mills makes 0.5mm and this is the order of depth of the flange face rings. Isn't the sealing capability...
  11. mariolucas75

    API 579 FFS-1 general / local metal thinning case study

    Dear All, Can you advise me any resource link for learning API 579 FFS-1 general / local metal thinning case study... with some basic examples / calculations.... Thks
  12. mariolucas75

    Pitting corrosion on piping

    Dear Forum, What would be your thoughts on following deterioration (photo attached). Piping is 2" (Wall thickness ~5mm) 316 SS in Marine environment for a long time under ~ 200 bars
  13. mariolucas75

    Piping leak repair with "something" that does not need surface preparation

    Dear forum members, There is a leak (multiple pin holes next to each other) on a 2" line which is heavily corroded (operating pressure 2 bars, oily water). The line can not be shutdown for a long time (10-15 min), leak is close to U bolt support, surface is very corroded... Is there some...
  14. mariolucas75

    Non metallic pipe inspection / repair code

    Dear All, What is the analogy (if there is) of API 570 but for non-metallic piping ? What are the NDT methods / code /standards of its integrity check ? Does PCC-2 cover the repair of non-metallic piping as well ? Thank you so much
  15. mariolucas75

    NDT Prior to welding

    DEar All... There is a flange to be welded to a 2" pipe ... Pipe end was beveled (preparation prior to welding), normally what NDT is performed - (if is performed) on beveled end prior to welding? Thank you
  16. mariolucas75

    Weld penetration details

    Dear All, Attached herewith the nozzle to shell weld detail (set through)... Could you please have a look and advise that the shape of bevel i draw next to the drawing is correct way i understand it... Also what is the "arc"-like marking on the drawing ? Thank you so much
  17. mariolucas75

    Temporary Repair calculations for piping

    DEar All, Could you please advise me please any link / resource where i can find examples of piping composite wrapping (temporary repair) calculations ? How many layers depending of piping / fluid parameters ... In fact PCC-2 practical application examples Tank you so much
  18. mariolucas75

    Carbon Equivalent Number for different steel

    Dear All, Carbon Equivalent (CE) number defines the weldability of the steel, the lower CE the better weldability, Is there a table for CE for known steel grades? and if no why ? There is a formula for calculation CE=C+(Mn/6)+((C+Mo+V)/5)+((Ni+Cu)/5) If we take for example a 316L SS that is...
  19. mariolucas75

    API 510 8.3.1 Permanent Repair Techniques

    API 510 Question one: 8.3.1 Permanent Repair Techniques Typical permanent repair techniques include the following. a) excavating the defect and blend-grinding to contour in accordance with API 579-1/ASME FFS-1 (also refer to ASME PCC-2, Article 304 for guidance on flaw excavation and...
  20. mariolucas75

    suitable timing for post weld NDE

    Where is a reference / guidance for suitable timing for post weld nde - depending on various factors: thickness, low/high Hydrogen electrode, preheat / interpass temperatures etc etc ?

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