Owner has requirements for new vessels with austenitic SS cladding to weld minor load-bearing internals (e.g. 1/2" thick x 3" wide tray support ring) after PWHT. According to our material engineer, the Owner requirement may be due to instances in the 1980's of clad disbonding after PWHT by the...
Hello,
We have a 2500 mm diameter column with trays that have 10" cross-over pipe downcomers. The trays are similar to Figure 10 in this AICHE paper...
http://www3.aiche.org/Proceedings/content/Annual-2013/extended-abstracts/P326306.pdf
Above the bottom blind tray is a distributor pipe...
The 2013 Editions of ASME Section VIII, Div. 2 & Div. 3 are available in IHS. I can't find ASME Section VIII, Div.1 in IHS. Does anybody know if Div. 1 has been issued?
In the Moss book, torsional moment was not included in the design of a Type 3 trunnion (no lug). I think torsional moment due to friction should not be neglected.
For those who design lifting trunnions, what coefficient of friction do you normally use in calculations?
I don't design lifting...
While searching for some info about lifting trunnions, I stumbled upon this historical video about vessel lifts...
http://www.heavyliftspecialist.com/heavy-lift-specialist-videos/lifting-big
Tom,
I am using Compress Build 7110 and noticed that Compress does not calculate the correct minimum nozzle projection for FVC 'F'/FCI 'E' nozzles. Instead of calculating the projection up to the face of flange, Compress calculates the projection at the corner of the barrel and the transition...
We have a 200 mm [~8"] thick vessel with a design temperature of 265°C [509°F]. The vessel is in hydrogen service (~10,000 kPaA H2PP) and wet sour service. The Material Selection Diagram (MSD) says the vessel needs a 347 SS lining, mainly due to the thickness of the base metal. But the internals...
I am checking a fabricator's nameplate drawing and they have placed the space/box for the NB symbol and number at the bottom of the nameplate. I usually see them at the top part of the nameplate. NB211 (http://www.nationalboard.org/SiteDocuments/Registration/nb211.pdf) seems to give me the...
Are there any issues or concerns with full-pen. welding SA-36 ladder rungs on a SA-516-70N vessel? Vessel is in hydrogen and sour service.
A vessel fabricator has specified SA-36 for the ladder rungs, which to me is acceptable and has been done many times in the past. However, our materials...
Are ladder and platform (L&P) drawings required to be stamped or sealed by a professional engineer in the states of Indiana, Lousiana and Texas?
The L&P's are attached to a nonbuilding structure (ASME pressure vessel).
The following articles from ChemicalProcessing.com were intended to provide guidance in specifying welded equipment.
http://www.chemicalprocessing.com/articles/2008/003.html
http://www.chemicalprocessing.com/articles/2008/065.html
ASME B16.5-2003 shows an incorrect "Nominal Designation" on Table 1A, Table 2-3.1, and Table F2-3.1
The correct nominal designation should be 35Ni–35Fe–20Cr–Cb
Roark's Table 11.4, Case 2 is for a rectangular plate with three edges simply supported and one edge free. The sketch shows the "free edge" is along the dimension "b".
For the formulas and aspect ratio (a/b) on the 3rd column to be correct, shouldn't the sketch show the "free edge" along the...
A steel ladder will be hot-dip galvanized plus painted. The ladder will be used during operation & maintenance of a petrochemical plant. Is there an OSHA regulation about the slip resistance of ladder rungs?
I looked into OSHA 1910 Subpart D and I didn't seem to find any requirements about...
I usually reinforce skirt access openings with angle stiffeners at each side of the opening, and I justify the angle sizes by performing some moment of inertia analysis. Manual calculations are not that difficult if there is just one access opening or if there are 2 access openings that are 180...
How come Compress still ask for stiffening rings (per Appendix 1-8) near the junctures of a toriconical transition? I thought stiffening rings or added reinforcements are NOT required as long as the knuckle radius meets ASME Code requirements.
I am using Build 6247.
Whenever I get the Appendix 1-8(b) or (c) deficiency report in Compress, I noticed that the program does not indicate the correct stiffener ring location when you are using the SI or MKS units. But it works fine when you are using the US Customary units. I guess the stiffener ring location in...
