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  1. engdrve

    Acceptance Criterion under ASTM A36

    corypad Sorry, I wrote it incorrectly. Structural products that exhibit injurious defects during subsequent fabrication are deemed (NOT) to comply with the appilcable product specifications.
  2. engdrve

    Acceptance Criterion under ASTM A36

    dbooker630 So, the opcion is to let our structural engineers to demonstrate theoretical wise that the plates will not fit for the design porpose?. What about, what is indicated in ASTM A6-06. 9.1 Note 4. Structural products tha exhibit injurious defects during subsequent fabrication are deemed...
  3. engdrve

    Acceptance Criterion under ASTM A36

    Hi, Mechanical engineer looking for advice from a metallurgic engineer. We have ordered the fabrication of an in take gate under the material specification ASTM A36 or ASTM A572. Due to de size of the piece the final assembling has to be done on site. During the weld joints preparation for the...
  4. engdrve

    Discharge ring cacks

    EdStainless, All ten Units are beginning to present the same problem. We can not pressure grout the ring completely because it is necessary to leave an access gallery around the ring in order to be able to reache under the wicket gates. since on this design the wicket gates´s gaps are adjusted...
  5. engdrve

    Discharge ring cacks

    metengr, thakns for the alert. I see you understand what is a warranty issue. That is why we have to check every thing. Sorry that english is not my firts language and i have hard time explaining the problem and I could be misssing information. Seems like the next proposal from the builder will...
  6. engdrve

    Discharge ring cacks

    metengr, Thank you for being interested in the topic. Yes the cracks in some cases extend into the base metal. forgive my ignorance but what is a hydrogen crack. I'm beginning to believe that, we are dealing with a premature problem of material fatigue due to the discharge vibrations. Another...
  7. engdrve

    Discharge ring cacks

    yes, The filler (weld) metal is E309. I have the weld procedure, and i think it has been done properly. I think the cracks on the in the bimetallic weld are small and not the main issued. Because the cracks on the carbon steel reinforcement plates Themselves are worse. So I think this is a...
  8. engdrve

    Discharge ring cacks

    The discharge ring material is ASMT A240 and the discharge reinforcement’s material is ASMT A537. Bimetallic is a site weld between ASMT A240 (Discharge) and ASMT A36 (draft Tube). The discharge is fab made with PWHT (Temp. 605,00 C , holding 3-4 h) . The first instruction from the builder was...
  9. engdrve

    Discharge ring cacks

    Looking for advice I am a mechanical engineer that works in a hydroelectric plant with Kaplan turbines of 180 MW. We have a problem of appearance of cracks in the discharge ring exterior horizontal reinforcement’s plates. Transverse cracks are also appearing in the bimetallic welding...
  10. engdrve

    Flanged joint pipe/valve FF/RF

    I am far in the field I am installing a pipe water line 3 kilometers long, ASTM A53 Gr B 6" Dia. 100 psi nominal presure. The piping arrived fabricated and painted with Welded neck RF flanges at de ends. And the gate valves arrived with FF flanges. What would be de consequense of joining the...
  11. engdrve

    Flanged piping joint FF/RF

    I am far in the field I am installing a pipe water line 3 kilometers long, ASTM A53 Gr B 6" Dia. 100 psi nominal presure. The piping arrived fabricated and painted with Welded neck RF flanges at de ends. And the gate valves arrived with FF flanges. What would be de consequense of joining the...
  12. engdrve

    Effects of applying epoxi paint to a flanged piping joint

    I am sorry guys, it is cs. water piping line, 8" Dia. at 150 psi, aprox. 3000 m long. it was also a proposal from the sucontractor in order to avoid corrosion on the faces of the fanges. because he wants to start to fabricate and paint the piping spools well ahead of the instalation time. But I...
  13. engdrve

    Effects of applying epoxi paint to a flanged piping joint

    In order to avoid corrosion is it possible to apply epoxi paint to the contacting faces of a water line FF flanged joint?. Will it has effects on the short or long term?.

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