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Many Thanks for your input guys, The plate will be normalised so i'm guessing curve D excempts it. The joint config is similar to Fig UCS-66.3g. I'm thinking excempting it with UCS-66(b)(3) since the ratio is smaller than 0.35. The vessel is being repaired with the addition of a very large...

Hi guys, I'm working on a carbon steel vessel with MDMT of -24degree C, the shell material is ASTM A516 Gr70 and the forgings/flanges are A105. I understand ASME B16.5 flanges are excepted from impact testing up to -29degree C. I've got a heavy neck forging of 152.4mm thk welded into the 35mm...

Thanks guys for your replies, MJCronin, the design code is B31.4, the design pressure:172.4barg, design temp: 57.4C/-41C, the header and branch material is API 5L X60. I know weldolets are acceptable but wanted to confirm standard thicknesses and possibly if branch replacement calculations...

Many thanks, DSB123. I've got a 20" sch 60 header and a 4" sch 80 branch connection; from ur explanation, i take it that a 20"x4"WOL sch 80 will do. Is the header pipe the basis for the weldolet selection?

Hi, Can someone please tell me how to calculate a branched reinforcement when using a weldolet to connect the header to the branch. Secondly how can i determine the thickness of the weldolet to be used in my calculation. Many Thanks in advance Fizzy

Thanks JStephen for your feedback. The reason i'm considering a fraction of the blast pressure is because, i'll have to input a blast pressure for the skirt support calculation as the code or my software assumes the vessel to be self supported which isn't the case in my scenario. With the...

Hi All, Can someone please throw more light on this or refer me to a text to help me clarify this with my client. i'm designing a vertical tower to the EN13445 code with severe blast loading on its supports resulting in an unrealistic thickness compared to the vessel. This is also not giving...

Thanks gr2vessel for your reply, i guess you're referring to clause j) of case 5500/87 for additional testing requirements as per Annex U. I'll however confirm enquiry case 87 has been withdrawn from the code as my client also made reference to it on the mech datasheet. fizzy.

Hi All, I'm designing a pressure vessel to PD5500 with a MDMT of -45C which requires a 24"NB RFLWN manway with a 60mm thk nozzle neck. Enquiry Case 5500/87 of the code states a max thickness of 50mm for temp range of -50C to 0C. I'm assuming this statement is for the vessel shell/head as my...

Thanks roca, I'll appreciate your calculation if you don't mind and maybe your referenced text. My problem is i can't find materials on half skirt design and i'm of the opinion that it's calculation is different from the calculation of an opening in a skirt which is explained in Bednar's...

Thanks guys for your feedback, i did consider the support leg option you've all adviced me to go with but wanted some insight if it was possible to have two half skirts. My understanding is the vessel is a replacement vessel, so i'm of the opinion that, it was possibly designed with two half...

Hi guys, I'm working on a vessel design which my client requires two half skirts welded on opposite sides of the dished head for its support. The vessel is a relatively small vessel (508mm OD) with two curved plates welded at opposite ends leaving the mid section open for access to the nozzles...

Hi all, I'm designing a high pressure vessel to EN13445 code which requires both support brackets and lifting lugs. I've completed my design based on internal pressure, external pressure, nozzle reinforcement etc to determine the thickness. On designing for the support brackets and lifting...

Yeah, so it means i'll have different values for both vertical and horizontal pressures. Because i have a calculated pressure of 14.6Barg for 2m x 12m high vessel. I'm being asked for both vertical(site) and horizontal(shop) values.

Thanks Vesselfab, This means that the test pressure at the top of a vertical vessel will be higher than when place horizontally due to the hydrostatic head. Pls is there a formular used in determining any of these cases?

Hi all, I'm designing a vertical vessel to ASME VIII and my client wants me to include both the test pressure vertical (site) and the test pressure horizontal (shop). Can someone pls advice me on which one is 1.3xDesign pressure and how to determine the other one. Thanks in advance.

Thanks, gr2vessels.

Hi All, Please i'm designing some lifting lugs on a horizontal pressure vessel and would need advice on calculating for the bearing (Hertzian) stresses and tension stresses.

Hi gr2vessel, Thanks for your reply. Like you said the anchor bolts are to prevent the saddle movement rather than overcome its movement. The vessel is to be placed in a pit which means wind loads wouldn't act on it, just seismic and possibly bouyancy when the pit is filled with water. I've...

Hi All, Pls can someone tell me how to calculate the anchor bolt load required to overcome saddle movement as a result of seismic load using ASME VII div 1. I'm working on a horizontal vessel of abt 15tonnes.