Does anyone have experience or recommendations for holding a nitrogen blanket / purge on piping modules and skids for ocean transport when the ends are plain / beveled ends?
The client specs do not permit flanges in these services.
The construction team wants to drop modules on foundations and...
What is a practical method to limit the slenderness of a process column built to Section VIII Division 1?
From what I can tell, there are no explicit restrictions in Sec 8 Div 1 on slenderness, only a limit on compressive stress. Skimming the books from Brownell & Young, Moss, and Megyesy...
What is your recommendation for the "R" Response Modification Factor for a skirt supported, welded steel vertical vessel such as a process column?
ASCE7-05 table 15.4-2 is the applicable reference.
Link: Table 15.4-2 (see page 2)
Under the non-building structures I am torn between
-...
What solutions can the community recommend for software to manage a vendor document review process?
Current state is receiving drawings and calculations from vendors by PDF in an email. Someone prints those out with a cover sheet with a list of people to route the packet too. The paper gets...
Is the justification for exempting carbon steel materials per Figure UCS-66 because the exempt materials are expected to achieve the results that would be required by Figure UG-84.1?
I accidentally purchased some 3/8" thick SA-516-70 as rolled plate with impact tests to -20°F. This plate is...
I believe I have found two ASME interpretations of ASME Section VIII Div 1 that are inconsistent concerning the RT number of vessels fabricated from welded pipe. Am I missing something?
VIII-1-01-150 – ERW pipe + seamless heads, spot radiography category B & C welds per UW-11(a)(5)(b). Shall...
I've got a small-diameter lethal service vessel per ASME Section VIII Div 1 with a 316SS metallurgy. I called for ASME SA312-TP316 EFW for the shell and nozzles, with 100% RT.
My code gurus are objecting to the SA312 specification though under two theories:
A) EFW is too similar to ERW. ERW...
Is anyone aware of a pencil-and-paper method for evaluating the strength of a circular packed bed support?
My application is for a bed which can generate a significant pressure drop across it (couple hundred psi). Our usual design (designed decades ago by engineers long gone who left no...
I'm the owner of a vessel designed to 100psig per ASME Sec 8 Div 1. The 3rd party fabricator hydrotested at 130psig, stamped it, shipped it to me.
Now I have B31.3 piping attaching to the vessel with a design pressure of 100psig. For process and logistical reasons, hydrotesting is not...
A client wishes to use RTJ on CL900 systems in both 304SS and 316SS. The gaskets are to match the metallurgy of the line, so I've got two 304SS flanges squeezing a 304SS gasket. Ditto for 316.
My concerns are...
Will this situation produce a satisfactory seal at reasonable bolt loadings?
Will...
Is it your practice to omit a fire case from the design of a process plant pipe's pressure rating, pipe supports, pipe flexibility?
This line I'm questioning is downstream of a PSV protecting a heat medium oil expansion vessel. Normal operation is in the neighborhood of 295F, the design temp...
A client decided ex post facto to increase the wind design criteria. The tower has already shipped to the client, but no foundation has been poured yet. What miracle solutions can anyone recommend for this situation?
The vessel has a compression ring baseplate arrangement which is the only...
I am engineering an assembly from my office in state "A" of the USA. The modular parts are fabricated in state "A". These modular parts will be erected in state "B".
I am licensed in both states.
This is all on behalf of an external client, so no industrial exemption applies.
What seal(s)...
Anyone care to share advice or lessons learned pertaining to modular, pre-piped pipe racks? Design, fabrication, shipping, installation, or use...
Biggest pain point for me right now is securing piping for shipping and letting it slide for operation. To ship it, the fab shop u-bolts each...
Is there even a perception of conflict of interest if a vendor pays my way to tour their out-of-town fabrication facility? Single day, there and back, one meal, no side trips. The catch... they're ferrying me back and forth in a private jet.
That seems to go beyond the minimal value...
What commercially available bolts are appropriate for a 18" CL600 manway on an ASME Section VIII Div 1 vessel with an MDMT of -200F? MDMT of -150F?
The vessel is 304SS. 18" CL600 flanges call for 1.625" diam bolts.
SA193-B8 Class 1 bolts are restricted to CL150 flanges per ASME B16.5.
SA193...
Do two 2" LWNs satisfy the Sec 8 Div 1 inspection opening requirement on a 36" ID vessel?
My vessel falls under UG-46(f)(2):
"All vessels 18 in. (450 mm) to 36 in. (900 mm), inclusive, I.D. shall have a manhole or at least two handholes or two plugged, threaded inspection openings of not less...
Does Compress have any alternate anchor bolt shear design criteria built in that I need to check in an options screen? Namely, ACI 318? If not, how can I officially request a new feature?
For horizontal vessels on saddles, Compress does a straight forward shear check on the anchor bolts, W*mu...
Can anyone recommend a resource for the design of shipping spiders? Anyone have some rules of thumb? Or even a go by?
My vessel's D/t approaches 150.
A previous tower of similar size arrived out of round after road shipment, even with weld-in rings every 2' for the field-installed trays...
What is the common industry practice concerning vessel design liquid level?
Code review, google search, and eng-tips search didn't give me any clues.
Is it "double jeopardy" to consider a seismic event while the vessel is filled to the HLL? From a simplistic view, any liquid level between LLL...
