Recent content by YBM

This material has been suggested for a valve body to service at -40F. ASME B16.34 will be used and it does not give pressure ratings below -20 F. Does anyone know the mechanicals at -40F or have any other information on its capabilities and how to rate it at that temperature? Thanks!!

I agree, except that UG-39 (c) and UG-39 (c)(1) direct me to App. 14 because of the large hole in the flat head. What else can I do but use App. 14?

Thanks for your reply. My shape is square square so in this case the spans are equal. Since the code directs me to use App.14 I don't see how I could use "Z".

I am designing a rectangular vessel according to App.13(in my case it is actually square). It has a flat integral head with an central round opening greater than 1/2 the shortest span. Reference to UG-39-(c)-(1) requires the head to be designed to App.14. App.14 does not recognize the...

Thanks!

I have Sec II Part D 2004 and do not find Inconel 718 (N07718) nor x750 (N07750) both of which would be SB637. I am interested in bar stock. Is this in the later editions? What I need is allowable stress at 100F and also the max temp. Any help will really be appreciated. Paul

ouch! Thanks

Thanks to all for your information.

Bob, thanks, and I will appreciate any information that you can provide on the wcb and cf8m. Baram & Valving: I will look into the offshore but my client is a smaller manufacturer and will mostly need smaller quantities and good delivery. The transit time can be a problem offshore. Also it is...

Thanks to all, I shall do that.

Is anyone willing to share the names of foundries that they know to produce quality valve body castings? WCB, CF8M and A395. USA only please.

Thanks for your thoughts. What I am having trouble with is that I do not see any mention of the Mandatory Appendices excluding flanged or standard class valves, or being only applicable to special classes. It is that word "Mandatory" that gets me.

In B16.34-2009 there are several Mandatory Appendices that deal with examination of castings, etc. The only reference, in the body of the standard, to these in in paragraph 8 (Special Class Valves). However, the appendicies do not reference this and their titles contain the word, "Mandatory"...

Nice listing of failure modes. Add to this, improper selection, and failure of the operator to maintain, service, and observe the valve. (Most valve failures are predictable, and therefore preventable. Operators will give their bicycles better maintenance than a valve.Okay so I exaggerated.)

Thanks to all for your comments. We will not sell a valve with flanges having a rating higher than the body rating. It is just asking for problems. It was good to see that the above comments generally agree with this practice. As to B16.34 2.1.1(g)this does agree with this what I have said...