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  1. mfgenggear

    NDT performed after or before Hydrotest test

    After Cleaning fittingtack welding and welding atlas centaur oxygen and hydrozine fuel lines, a pressure test is conducted with helium. The welds do leak but it is very very light. Which then has to be repaired or reworked.
  2. mfgenggear

    NDT performed after or before Hydrotest test

    Nitrogen leak test
  3. mfgenggear

    NDT performed after or before Hydrotest test

    I think you lost it, better take a chill pill
  4. mfgenggear

    NDT performed after or before Hydrotest test

    Op I wanted to add the the above procedure is for high hydrostatic pressure testing. 1000 psi or more. Nitrogen is acceptable for low pressure. For verifying for leaks of joints with a meter. Hydrostatic with the certified and qualified equipment is safe. No loud explosions. Just a leak...
  5. mfgenggear

    Preventing Metal Component Failures in Industrial Projects – Any Tips?

    Op This not a simple answer. #1 ) correct designs criteria, metallurgical, tensile properties.,correct geometry. #2) applicable specifications for control of The manufacturing and quality. The required Inspection sampling of the components for dimensional control. #3) your company and the...
  6. mfgenggear

    NDT performed after or before Hydrotest test

    Back in the late 70's my customers would require , penetrant inspect, radiographic inspection, and hydrostatic pressure testing. To in sure weld integrity. As an apprentice level 1 then level 2 I did all three. Don't remember the exact specifications. It is an option for the design engineer...
  7. mfgenggear

    Pile longitudinal rebar twisted during fabrication

    Well it's all mute, because none of you have design authority. Op has to get his engineer to approve it, it doesn't matter
  8. mfgenggear

    NDT performed after or before Hydrotest test

    Your answer is ridicules and has no merit. It applicable to the contract, contract requirements , the specifications, and your insulting answer is un Profesional.
  9. mfgenggear

    Pile longitudinal rebar twisted during fabrication

    This is cover your rear situation. Grab the chief engineer, have them redline the drawing if it is acceptable. Put the burden on the Engineer. However It happen it may be common. But it has to be in writing. No verbal, no internet answers. No guessing. This can be a safety issue. Like I said...
  10. mfgenggear

    Pile longitudinal rebar twisted during fabrication

    Question Was for blockhead, this is not my specialty. How ever free body diagram should be drawn. What is the design intent, is acceptable to design drawings. It's above my pay scale.. I would want engineering to sign off as acceptable. This is not an internet question.
  11. mfgenggear

    NDT performed after or before Hydrotest test

    I should have said unacceptable indications. Eg cracks, porosity ect
  12. mfgenggear

    Pile longitudinal rebar twisted during fabrication

    Ya explain show your numbers, how does this effect structual integrity. Your statement is ridiculous
  13. mfgenggear

    NDT performed after or before Hydrotest test

    Generally it's pass or catastrophic failure
  14. mfgenggear

    Pile longitudinal rebar twisted during fabrication

    An sop has to be written, and a proper structural analysis. Job has to be stopped until your satisfied with the correct answers. No simple answer.
  15. mfgenggear

    NDT performed after or before Hydrotest test

    Here is the issue. Radio graphic inspection , penetrant inspection, or magnetic inspection will find imperfections. Depending on manufacturing and material. And what is specified on the drawing or quality contract requirement. If rework or repairs are required. It must be performed prior to...
  16. mfgenggear

    NDT performed after or before Hydrotest test

    OP Hydrostatic test with water will not explode. I prefer to ndt before
  17. mfgenggear

    Boeing engineering drawings

    OP Request a Boeing quality engineer to assist or train. Do it right
  18. mfgenggear

    Planetary Gearbox mounting

    i agree
  19. mfgenggear

    Heat treatment steel 4140 stress relief.

    I don't have the latest specification. but review the AMS2759/11 para 3.5.1 and 3.5.2 , recommended stress relieve is 375 degrees f. it will prevent or mitigate stress cracking. it becomes an issue on high temperture heat treaters will do a preheat then ramp up on hight temperture heat treat...
  20. mfgenggear

    Planetary Gear Design - Profile Shifted

    Try Planetary gear sets are one of the most difficult to manufacture. Here's why Ringgears are difficult to maintain roundness. Depending on the heat treat, hardness, if it is case harden. Unknown Material Heat treat requirements Agma quality requirements Involute profile. As stated it is...

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