Good day all.
I am puzzled by the applied loadings used to check the stress in the flexible shell element (FSE) of a thick joint per "TEMA 9th Ed. 2007".
I have followed the procedure to determine the equivalent pressure due to expansion, equivalent shell-side pressure and tube-side pressure...
Hi All,
Paragraph 5.4 from API-650 says that the minimum width of sketch plates should not be less than 1800 mm unless purchaser agrees.
For my particular application, I am using 2m wide plates, 6m long. The tank is 7m inside diameter. For the center plate on the bottom I use the full 6m long...
Hi All
In the Table 5.21, for uplift load cases, it is written for W1 and W2 definition: -
W1 = is the corroded weight of the roof plates plus the corroded weight of the shell and any other corroded permanent attachments acting on the shell
W2 = is the corroded weight of the shell and any...
Hi All
Reference tank design for seismic to AWWA D103 standard:
I'm a bit puzzled trying to understand the wording included in the above standard under Section 14: Seismic Design.
It says:
"The design design seismic forces have been reduced by a factor of 1.4 and shall be used with the...
Is it permissible to use structural grade material for skirts for ASME VIII Div.1 equipment?
Quoting UG-4(b) Material for nonpressure parts, such as skirts, supports,
baffles, lugs, clips, and extended heat transfer surfaces,
need not conform to the specifications for the
material to which they...
Hello
On tall process columns such as we have to design approx. 120 ft tall, in the order of 8 to 10 ft diameter, insulated 2" with a number (approx 5 to 7) access platforms with ladders for manway access as well as a large pipe going along the length of the column to the top nozzle, is vortex...
Is there any restrictions or roles for how close fitting a tube is in a tube sheet that is to be welded?
For clarification, tubesheet design per ASME VIII D1 l, tube thickness 1.2 mm
Fabricator wants to cut holes bt lazer or similar process but is concerned that some ASME requirements are in...
Hi All
Is there any advice how to go about the design of a custom inpsection nozzle with a sight glass. The glass is sealed with a gasket . The picture shows a similar item to the one in question. The only difference is this one has few bolts keeping the glass cover in place. The one I want to...
Good day all
I have found some related posts on the forums, partially they address that sanitary fittings made to A270 do not fulfil the requirements for ASME VIII Div 1 since there are no tensile testing done.
However, other posts refer to ASME BPE fittings with burst test data or some ratings...
Hi All
I am working with a fabricator who prefers the use of rectangular section stiffeners made from plate.
My question is that this is not shown on Figure 5.24—Typical Stiffening-ring Sections for Tank Shells . This shows bent up sections and angles.
Is this acceptable to use this type of...
Hi All, see attached photograph
What is the logic of bracing back to the cone on this silo?
We have had some discussions and it seems that it is to limit the unbraced length of the leg in the weak direction?
Any...
Hi. When is it appropriate to design X bracing for compression?
Some silo bracing are pinned at the center, this would suggest they are designed to reduce the effective length for compression?
Mikeg7
I am designing a silo for limestone and am doing an FEA using the variable pressure in the barrel and the conical hopper along with the values of wall friction angle, internal angle, bulk density, hopper angle etc. according to the pressure distribution methods described in relevant Codes(e.g...
I am trying to design a frame for lifting a boat out of the water in Risa 3d. The frame is in the horizontal and is simply a rectangle frame at each corner is a plate which the lifting chains attach to (i.e a single lift point ) and straps go below the boat's hull. How would I put boundary...
Hi I was wondering if anyone can shed some light on the concept of the stresses at the intersection of the shell and cone? My question stems from an observation that flatter the cone end, the greater the discontinuity (and stress):
when the half apex angle is less than 30 degrees, we don't check...
Not sure if this is the best location in the forum to post this question:
The WRC-107 analysis done for a lifting trunnion assumes that the trunnion is connected to the shell and calculates the stress in the shell and in the pad if a pad is used.
I have a situation where I want to weld the...
I am asked to evaluate an existing vessel that has seem many years of service for brittle fracture. The minimum design metal temperature is not changing.
I am not sure if it is required to be done because I have researched this topic a bit and it is advised in API-653 (5.2.2) that brittle...
Hi. The tubesheet calculation in Part UHX determines the thickness to be sufficient based on the pressure, temperature and other loadings.
My question is that I have come across a statement in PD 5500 if anyone is familiar with the BS codes that says that for expanded tubes the thickness should...
I am reading a "Classic BULLETIN Article" that appeared on the National Board website at
https://www.nationalboard.org/PrintPage.aspx?NewsPageID=144
In one of the questions and answers, someone asked how to calculate the value of "E" for use in the UG-27 formula where there are different welds...
