From my understanding of ASME BPVC Section VIII Div 1 2019, UCS-66,
ASTM A105 is permitted to -8C, ASTM A105N is permitted to -29C, and ASTM A350 LF2 Class 1 is permitted to -45C.
The revision in 2019 was brought about by failures in A105 flanges at temperatures warmer than previously...
MJCronin,
I share your opinion re: newbie piping stress analyst. I'm already pushing for a revision of the loads to be developed with more accuracy and expertise.
I'm aware of the stigma around gusseting nozzles and how it should be restricted to vendor-specified agitator nozzle. I have no...
G'day guys,
Working with some significant nozzle loads (250 kN axial, 580 kN.m for DN900 into 1800OD vessel) and thinking through various options for strengthening the nozzle.
At this stage, reinforced set-in nozzle construction is yielding shell & comp plate thicknesses around 40mm, a little...
G'day guys,
Certifying an aluminium lift shaft structure that will be installed adjacent to an existing steel/conc. school structure. The lift is external to the structure and will be used to provide access to disabled. Our client currently manufactures elevator shafts to be fixed off at each...
Gasket principles require a combined bolt force to apply a stress to the gasket that is equal to or (ideally) exceeds the stress required for the gasket to seat (a.k.a. seal) properly.
Challenges arise when determining the appropriate gasket area that is influenced by each bolt, especially in...
Aside from the heresy that is welding bolts, design the bolt for resisting the equivalent prying tensile load.
Take moment at end of channel. Determine bolt tensile force to resist moment. Design channel accordingly. Also consider edge distance of bolt from end of channel.
Yes, in-service loads should typically be applied in conjunction with environmental ultimate design loads (think wind, seismic, snow etc.) although these enviro loads are generally not applied concurrently.
160MN, now that clears a few things up. It sounds from Trenno's buckling calculations you're close to the limit, not to mention the moment at play due to axial eccentricity, which will surely bring the column over capacity.
Sounds like some serious review of end restraint/ column sizing is due...
Big column. I fail to see why the design eccentricity shouldn't be related to the scale of the column. Sounds like a case of trying to convince yourself the reverse or otherwise is true, simply because it suits your current situation. Dangerous game to play.
1 MN, that's some load.
100mm from the face of the column, or at the centre of bearing, whichever is greatest, is what I'd take the eccentricity to be for your column axial design load(s). This is backed up by AS 4100, my local code. EDIT: There is provision for column caps/direct bearing...
Far too little information to offer advice moving forward.
The design has a lot of fasteners and I suspect this a) is not necessary, b) will cause frustration on the assembly floor due to torqueing sequencing and c) add cost to design & manufacture. If manufactured with clearance holes for...
DoodlerDaru
Codes and Standards have been written to provide design guidelines for vessels. A simple way of udnerstanding it is that typical details such as cylindrical shells, flanges etc. are well understood. Testing and verification has been completed that allow code committees to develop...
LSUUR,
Some side notes, it's concerning to hear that you've arrived at a 40mm tubesheet which isn't pressurised and attached to the shell with a single 4mm fillet weld. It's likely that the tubesheet and its attachment to the shell should be designed to pressure equipment codes such as ASME.
sdz,
All said and done, a tank that size I'd expect anchoring. I also agree with BJI, why re-invent the wheel?
But if you want to continue down this path, I'd recommend not considering any water present for wind when assessing overturning or sliding of your tank.
Follow AS/NZS 1170.2 for...
LittleInch,
After re-reading, I understand this equipment is for the hydrotesting of other equipment. Yes, design pressure should equal max. pressure being used to test other equipment, or possibly even 5-10% above expected max. operating pressure.
Tom
Hi Vis,
ASME B31.3 would be a good place to start. I'd recommend that you rate the pressure capacity of your manifold to a pressure lower than the test pressure, not equal to the test pressure. This is common practice amongst pressure piping and vessel codes. Note also that test pressure is not...
