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Recent content by genericmech03

  1. genericmech03

    Detecting porosity in Aluminium Castings

    The casting part's thickness varies form 25mm to 3mm. The ideal route to take would be to solve the problem at the supplier's end, however despite lengthy efforts they just don't seem able to consistantly achieve as required by the porosity spec. So in the mean time we are wasting money and...
  2. genericmech03

    Porosity Detection in Aluminum castings

    Thanks a lot for the advice, it sounds like it's possible to achieve the inspection with either ultrasonics, x-ray or gamma ray testing. Unclesyd Did you have to send the parts outside for testing or was it some thing you did on site? If on site how long did the inspection process take per...
  3. genericmech03

    Detecting porosity in Aluminium Castings

    Hello, I thinking of using ultrasonic or x ray porosity detectors to pick up porosity in aluminum die castings. The porosities are located under the surface of a raw casting so we currently only find them after we machine them. We would like to detect porous parts before wasting money on...
  4. genericmech03

    Porosity Detection in Aluminum castings

    Hello, I was wondering if anyone had any experience in detecting porosity in aluminium die castings . We currently only detect the porosities after machining the surface away, but I would like to detect them before we waste money on the machining. I was thinking of maybe using NDI techniques...
  5. genericmech03

    Eng work in Japan

    Thanks for the advice! I do plan on staying with a host family, so I will ask them. Although homestay accomodation too is also difficult to arrange without an introduction. Wayne, That tip about the military installation is a great lead, I never would have thought of that. I don't think...
  6. genericmech03

    Eng work in Japan

    Hello, I am heading to Japan for 12-18 months to teach english, however I would like to stay in touch with the engineering side of things. Can someone give me the lay of the land with regards to getting part time/short term mech eng work in Japan. My plan currently is to start knocking on doors...
  7. genericmech03

    Removal of Safety Relief Valves with out losing pressure

    Everyone, Thanks for all of your responses. Greatly appreciated. This has generated far more debate than I imagined. Seeing as the three-way changeover valves and the full port ball valves are doing the same thing my dilema now comes down to a matter of sizing. As I will never be able to...
  8. genericmech03

    Removal of Safety Relief Valves with out losing pressure

    Thanks guys, That website's product information wouldn't load up, can anyone suggest an alternative supplier Cheers
  9. genericmech03

    Removal of Safety Relief Valves with out losing pressure

    Thank you PVRV!, Oh me of little faith! I just found the appropriate clause in the standard,(Clause 8.8.4 AS 1210) that refers to isolating PSRV's. I will have to purge the current system's to put these stop valves in place, but at least it will only be a one off situation, allowing easy...
  10. genericmech03

    Removal of Safety Relief Valves with out losing pressure

    Thanks all for your response, After a bit of investigation I have found that all PSRV must be installed integrally to the pressure vessel. That is, there can be nothing between it and the pressure vessel that may possibly isolate it, and therefore negate its function. Your comments have given...
  11. genericmech03

    Removal of Safety Relief Valves with out losing pressure

    Hi, It's a bit of a long shot but does anyone know of anyway of removing a safety relief without removing the contents of the vessel and losing pressure. We have an anhydrous NH3 chilling system, so in order to perform routine maintenance on our relief valves, each vessel must be emptied, which...
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