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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...

Great, thanks! -MGH

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...

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...

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

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...

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

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...

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...

Why were the components rejected? Micro fracturing?

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...

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

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...

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

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...

Blegh. What can I expect with forced convection?

Currently looking at doing some HT on some rather large cross sections of 4130. What is the average through hardness depth that is usually seen out of 4130? I keep getting a wide range of values, but from what I have heard it is about 2 inches which seems low... going to be HT,Qenched and...