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Recent content by mgh70

  1. mgh70

    Spring Qualification Procedure

    Hello all, I am currently creating a spring design qualification procedure for a fail-safe subsea valve. Current valve/actuator assembly to be qualified per 6A and 17D for which I have already created an extensive procedure for. My current issue is that our end user has specifically asked for...
  2. mgh70

    Spring Qualification Procedure

    Great, thanks! -MGH
  3. mgh70

    API 6A PR2 Test Lab

    From my experience: Stress Engineering (Houston, TX)- They average around 40K-60K for PR2 testing, poor service, no straight answers to questions (its like talking to a bunch of lawyers). I would not recommend. Southwest Research Institution (SanAntonio, TX) - Average around 25K - 30K for PR2...
  4. mgh70

    Spring Qualification Procedure

    Hello all, I am currently creating a spring design qualification procedure for a fail-safe subsea valve. Current valve/actuator assembly to be qualified per 6A and 17D for which I have already created an extensive procedure for. My current issue is that our end user has specifically asked for...
  5. mgh70

    52CrMoV4 1.7701 vs 5160 vs 6150 for spring material

    Thanks for the helpful response CoryPad. I assume all three have the same chemical compatibility in saline conditions? -M
  6. mgh70

    52CrMoV4 1.7701 vs 5160 vs 6150 for spring material

    All, I am looking for the pros and cons comparing 52CrMoV4 1.7701, 5160, and 6150 for spring application. Currently have a requirement for 5,000 minimum cycle life, with stress levels at 136,000 lbs/in^2 at the top of its working deflection (bar dia of 2.687"). Possible saline conditions...
  7. mgh70

    Chrome Alloy (52CrMoV4 1.7701) vs. 5160 vs. 6150 For Spring Material

    So in terms of crack growth, fatigue, and modulus all three are pretty similar. No real difference then?
  8. mgh70

    Chrome Alloy (52CrMoV4 1.7701) vs. 5160 vs. 6150 For Spring Material

    All, I am looking for the pros and cons comparing 52CrMoV4 1.7701, 5160, and 6150 for spring application. Currently have a requirement for 5,000 minimum cycle life, with stress levels at 136,000 lbs/in^2 at the top of its working deflection (bar dia of 2.687"). Possible saline conditions...
  9. mgh70

    High pressure valve seals

    I would look into Hytrel, spring energized lip seals, with a back up ring for extrusion. Though you won't want much extrusion on your back up ring, so consider that. Hytrel is one of the better materials you are going to find with the seal-ability at and the abrasion resistance you will need...
  10. mgh70

    PTA welding on hard materials by nature - inconel,monel & duplex material

    Why were the components rejected? Micro fracturing?
  11. mgh70

    Steam Choke Valve

    As far as packing goes, Viton Core material is a good option normally but is only reliable up to (200C)(~48Hr life at 300C), your encapsulation material FEP maxes out at about 200C as well. For above 200C you won't find much in the way of elastomers in my experience. I would look into braided...
  12. mgh70

    Steam Choke Valve

    What kind of working pressures are you looking at? -M
  13. mgh70

    Harden-ability of 4130

    For prototyping and concept validation we are using a worst case scenario which is production using 4130 which is common practice practice for less extreme applications of our equipment. Production will feature F22, however the customer figures if it is validated using 4130, the end user would...
  14. mgh70

    Stainless Particulates

    I've had good results using Colmony or Wallex coatings if you are looking for hard-facing material. Though, I don't know what your application or budget is. http://www.wallcolmonoy.com/products-capabilities/surfacing-alloys/ -M
  15. mgh70

    Harden-ability of 4130

    Well the maximum hardness I am wanting for this application is 235 BHW all the way through and a Minimum yield of 80ksi. Current process will be: Normalize at 1700F for 5.5hr, then Austenitize at 1600F 5.5hr, quench below 400F, then temper at 1200 for 11 hours, finally ending with air...
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