Every case should be looked at individually, since details will vary, but as merrillwalt has found, if you do the calculations, you will probably find in many cases that such a bundle can indeed be lifted without a cradle.
Using the parallel axis theorem, it can be found that the stiffness of...
Hi Alejandro. TDW's machines mount to standard flanges, various pressure classes (ANSI/ASME B16.5, plus probably DIN). The tapping and stoppling machine mounts to a full bore flanged gate valve. The gate valve mounts to a flange on a fitting you, or TDW, welds to the line to be...
DSB123,
Every system is different, and it is not possible to make a statement that will apply to every branch connection. However, I can provide some discussion on considerations which go into the design, and why I have found in some circumstances, a stub-in provides better performance than a...
I agree the lowest SIF branch connection is a welding tee, followed by sweepolet, then weldolet, but there are circumstances where a "stub-in" or "stub-on" branch may be selected, such as instrumentation take-offs, hot tap, etc. (Obviously a hot tap has to be "stub on" - unless a saddle or full...
I'm not clear on what you are looking for. Is this an existing stopple, or are you planning to do a stopple? If you are planning to do a stopple, you should use a reputable hot tapping and stoppling company, such as T.D. Williamson http://www.tdwilliamson.com/hottaptdw/fittings/fittings.html...
forensiclab,
DN 150 means a nominal pipe diameter (Diametre Nominale??) 150 mm. Actual OD will be 168.3 mm = 6-5/78 = 6" nominal diameter. PN 16 is nominal pressure rating, a bit below ASME Class 150 ("150 lb"). The 16 stands for 16 kg/cm^2, and, e.g. to the 1976 DIN2401 standard (I do not...
Sid7:
Yes, I am talking about the loop, but note I said "depending on the design ...". A lot depends on where anchors & guides are located, size of the tie-in, etc.
For example, a simple "U" loop of 6" Sched 40 CS pipe operating at 600 deg. F, 50 ft OAL between anchors, with a 10 ft long "U"...
While I agree it is good practice to avoid tie-ins on loops, I also agree with "zuccus": without the whole story, it is unreasonable to flatly state it is a bad design. Keep in mind, piping systems are under varying stresses for their entire length, not just at loops. It could be possible to...
Latexman may be on the right track, it's hard to tell from the VNE web site if this is the fitting.
MikeHalloran, you are right, it appears some people may be commenting on a different fitting. There are a bunch of photos on the FLIKR site, and when I pulled it up, I had to scroll through the...
Italian fabricators building equipement for us have used FOMAS S.p.A near Milan, Italy:
http://www.fomas.it/
Very high quality, very large capability.
Last job was 304H tubesheet 162 inch diameter x 6.375 inch thick (finished dimensions). FOMAS also did rough machining and full U/T scan per...
Depending on how precise you want or need to be, you might inquire at the following company:
http://www.acescolumbus.com/
I understand that they have some expertise in blast and fragmentation analysis, using FEA techniques. Perhaps they would be able to anlayze your vessel. I expect they could...
Does anyone know of any justifcation for extrapolating the ASME Section II Part D external pressure curves for higher design temparatures?
E.g.: 304H (UNS S30409): Table 1A lists allowable stresses up to 1500 deg.F, but ext. pressure chart HA-1 only has curves up to 1200 deg. F. Does this mean...
