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  • Users: kjf1
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  1. kjf1

    MDMT for 430F Stainless Steel

    We buy this welded assembly from Parker, so we did not design it or specify its materials. I don't know why Parker chose to use 430F SS. This part is a subcomponent of our valve. The reason this is coming up now is that we have a potential application for our valve which requires a -70 MDMT...
  2. kjf1

    MDMT for 430F Stainless Steel

    stanweld: Can you give me more information regarding this "cold box" testing? Is it simply putting the valve in a chamber, reducing the temperature to the desired value, and operating the valve at its design pressure to see if it fails? That seems pretty risky given that we have a design...
  3. kjf1

    MDMT for 430F Stainless Steel

    The part in question has a tube of 304SS with relatively large chunks of 430F welded onto either end. The 430F is used due to its magnetic properties (this is part of a solenoid valve). Is it acceptable by B31.3 rules to use a material below its MDMT if there is a sufficiently large safety...
  4. kjf1

    MDMT for 430F Stainless Steel

    Does anyone know where I could find any published data on the minimum design metal temperature (MDMT) for 430F stainless steel, or at least some impact testing data for this material at low temperatures (-70C)? Thanks
  5. kjf1

    Aluminum to Steel Connection

    Would anodizing the aluminum solve the issue of galvanic corrosion when it is in contact with stainless steel?
  6. kjf1

    Hydrogen Gas Sensor

    Try http://www.neodymsystems.com http://www.detronics.com
  7. kjf1

    B31.3 or Sec. VIII Div. 1?

    Isthill: The compressor package is built to API 11P. prex: Who decides what volume and geometry may be 'generally recognized as a piping component or accessory'?
  8. kjf1

    B31.3 or Sec. VIII Div. 1?

    The primary function of this assembly is to add volume to the piping system of a compressor so that when the system is shut down, it settles to a relatively low pressure without having to vent any gas. A secondary function is to collect a small amount of condensate which can be drained from a...
  9. kjf1

    B31.3 or Sec. VIII Div. 1?

    The following is an exerpt from ASME VIII Div. 1 code: "U-1(c)(2) Based on the Committee's consideration, the following classes of vessels are not included in the scope of this Division... U-1(f) piping components, such as pipe, flanges, bolting, gaskets, valves, expansion joints...
  10. kjf1

    Compressed Gas Heat Exchanger

    I am attempting to solve a "simple" heat transfer problem, but I am having some difficulty. I am trying to use hot natural gas from the discharge of a compressor to preheat gas being fed into a regulator to prevent the regulator from freezing (the gas dewpoint is -40F). I want to...
  11. kjf1

    High Pressure H2 - Material Compatibilities

    Thanks for the tip! For others who are interested in this topic, I also found a helpful document at NASA's website. Go to http://www.hq.nasa.gov/office/codeq/doctree/safeheal.htm# and click on the "Hydrogen Safety" box in the tree. There is a good section on hydrogen...
  12. kjf1

    High Pressure H2 - Material Compatibilities

    Does anyone know of a good reputable source of information on material compatibilities for high pressure (6500 psig) hydrogen? I know there are problems with hydrogen embrittlement of some steels, and that some elastomers are problematic due to the small size of the H2 molecule, but I haven't...
  13. kjf1

    Tapped Hole in B16.5 Blind Flange

    Is there any reference where I can determine what the change (if any) would be to the listed pressure rating of a B16.5 blind flange by tapping a hole in it (of NPS equal to or smaller than the NPS of the flange)? I'd rather not go through the entire calculation per Sec. VIII Div. 1 Appendix 2...
  14. kjf1

    B31.3 Nozzle Calculations through B16.9 Pipe Cap

    I am doing a design which requires a 3" Sch 40 nozzle to extend through (along the axis)of an 8" Sch 40 B16.9 Pipe Cap. I understand the branch calculations in B31.3 for run pipe, but how do I apply them to a pipe cap? Also, I want to install a 1/4" coupling as a drain in the...

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