Recent content by stanrick

Beiringf, We build vessels to Sect.VIII, Div.1, per UG-90(c)(2). The vessels cannot tolerate traces of moisture. So we pneumatically test per UG-100, rather than hydro test per UG-99. The situation, naturally is complicated. First because of the extreme danger of pneumatically testing...

Table UG-43 gives minimum thread engagement and min thickness of the head. Of course you'll still need to meet UG-34.

I am redesigning a small vessel for use in Europe at -20F (-29C). Currently it is made of SA53B,E shell, SA414G heads, SA36 machined nozzles. My understanding is that these materials cannot be rated -29C in Europe without impact testing. But I understand that I can achieve -29C if I switch to...

Thanks all for your input and guidance. In answer to eyec, the tubes, tubesheets and waterboxes are 90/10. The shell is carbon steel.

Hello All, We are designing a heat exchanger for marine service. The customer has asked that the tubeside meet ASME Code Sec8 Div1 and be made of 90/10 CuNi. I'm making the Domes and Flanges out of SB171-C706. I don't see any CuNi in Sect 2 Part D for B16.5 flanges and B16.11 fittings. So I'm...

If you're doing Section VIII, Div 1, take a look at the exemptions granted & restrictions placed in UG-36(c)(3).

I'm pretty new in this field, but the only standard I'm aware of is TEMA RB-7.24, C-7.24. No doubt there are more experienced folks who can elaborate on this. Rick

Excuse my ignorance. My understanding is that any vessel "needs" an ASME Stamp only when the customer requires it. In turn, the customer requires it because his insurance company or local regulations or his good sense tells him he should have it. Strictly speaking, a manufacturer who only cares...

Mike, Thanks for guiding me to the No-Tube-in-Window reference. Your feedback is consistent with what my AI says. I've used UHX on non-circular tube distributions in the past. But lately have found that the tube column bending results (UHX-13.5.9) are driving me to what seems like...

UHX-10(a) says that for the rules of Part UHX to apply, a tubesheet must be "uniformly perforated over a nominally circular area". I conclude, then, that if a tubesheet is not "uniformly perforated over a nominally circular area", the Tube Requirements of UHX-4(e) are not mandatory. In that...

Thanks all. I've ordered the 9th edition. Just one thing, though: I've been told by a more senior engineer that many of the TEMA Mechanical Standards are only "recommendations". An actual design needs only to be close to the Standard. It seems to me, then, that "meeting" TEMA Standards is...

Does anyone know of an organization that offers training in the TEMA Standard? I did not see any training offered on the TEMA website. Thanks.

UG-41(b) says I can use the minimum of W, W11, W22, and W33 in evaluating nozzle weld strengths. In the case of Fig. UG-41.1(b), if if A1>A then W<0. Does this mean ANY nozzle attachment weld strength is acceptable, as long as the weld meets UW-16 requirements?

Can anyone direct me to a source of information on how to get pressure vessels approved for export to South Korea? I didn't find anything in a search of Eng-Tips. I assume meeting ASME Sect VIII Div 1 is a good first step. Perhaps someone can offer additional guidance. Thanks. Rick

See UG-16(b)(2). What I wonder, though, is when calculating thickness for internal pressure (per UG-27), what value of E do you use for seamless copper (like SB75 C12200 H80). UW-12 says use E=0.85 for seamless shells, head, etc. But does a copper tube fall under UW?