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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...

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...

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...

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

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

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

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'?

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...

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...

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...

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...

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...

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...

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...